ML19007A327
ML19007A327 | |
Person / Time | |
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Site: | Peach Bottom ![]() |
Issue date: | 02/28/2000 |
From: | Exelon Generation Co, Normandeau Associates, PECO Energy Co |
To: | Office of Nuclear Reactor Regulation |
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Download: ML19007A327 (195) | |
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{{#Wiki_filter:January 7, 2019 U.S. Nuclear Regulatory Commission ENCLOSURE 3 03_NAl_2000.pdf [NAI] Normandeau Associates, Inc. 2000. "A Report on the Thermal Conditions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Operation at the Peach Bottom Atomic Power Station (June-October 1999)." Prepared for PECO Energy Company. February 2000.
A REPORT ON THE THERMAL CONDITIONS AND FISH POPULATIONS IN CONOWINGO POND RELATIVE TO ZERO COOLING TOWER OPERATION AT THE PEACH BOTTOM ATOMIC POWER STATION (JUNE-OCTOBER 19~9) NPDES Pumit No. PA009723 PREPARED FOR: PECO Energy Company 230 l Market Street Philadelphia, Pennsylvania 19101 PREPARED BY: Nonnandeau Associates, Inc. 1921 River Road Drumore, Pennsylvania 17518 FEBRUARY 2000 NORMANDEAU ASSOCIATES ENVIRONMENTAL CONSULTANTS
A REPORT ON THE THERMAL CONDITIONS AND FISH POPULATIONS IN CONOWINGO POND RELATIVE TO ZERO COOLING TOWER OPERATION AT THE PEACH BOTTOM ATOMIC POWER STATION (JUNE-OCTOBER 1999) NPDES Permit No. PA009723 PREPARED FOR: PECO Energy Company 2301 Market Street Philadelphia, Pennsylvania 1910 l PREPARED BY: Normandeau Associates, Inc. 1921 River Road Drumore, Pennsylvania 17518 FEBRUARY 2000
Report on Thermal Conditions and Fish Populations In Conowiago Pond Relative to Zero Cooling Tower Operation* at PBAPS, 1999 EXECUTIVE
SUMMARY
In l 996, PECO Energy sponsored a study to detennine whether the number of cooling towers in operation at Peach Bottom Atomic Power Station (PBAPS) can be curtail~ without adversely affecting the integrity of the balanced, indigenous fish community of Conowingo Pond. Resuit.s of that study (Normandeau Associates, 1997a), which was coordinated with agency personnel primarily from the Pennsylvania Department of Environmental Protection, Pennsylvania Fish and Boat Commission, and Maryland Department of Natural Resources, suggested that the station could be operated with zero towers without adversely affecting the balanced fish community in Conowingo Pond. As a result of that study, PECO was issued a pennit amendment to operate PBAPS with no cooling towers. However, to address agency concerns of the relatively high river flow and low water temperature conditions in 1996, PECO proposed a three (3) year monitoring program ( 1997 through 1999) to increase the probability of observing potential effects over a wide range of flow and temperature conditions. The principal components of the monitoring program were subsequently incorporated in the permit amendment. As in 1997 and 1998, monitoring in 1999 (the third and final year of study) was conducted monthly in June-October. The investigation included two components: relative abundance and distribution of fishes as measured by a variety of gears and evaluation of thermal conditions. Sampling was conducted at selected locations that had been monitored historically. A complete set of sampling within the one week per month consisted of the following: 48 h of trap netting, one set of seine collections, trawling at transect and zone locations, electrofisbing, and two thennal mapping surveys. The ambient water temperatures (as measured at PBAPS intakes) ranged from 54.4 to 86.5°F and varied between months due to changing natural hydrological and meteorological conditions. Temperatures were highest in July, followed by August, June and September, and lowest in October. Compared to previous study years, ambient inlet temperatures in swnmer 1999 were higher, exceeded 80°F longer (nearly 56 consecutive days), with daily values 2'.:83°F on 35 days versus 3 and 13 days, respectively in 1997 and 1998. River inflows in 1999 were lower than in the historical period (1952-1998). Record low river flows for May and June occurred in 1999, while those in July and August 1999 were the lowest for those months in the last 33 years. River flows in summer 1999 were substantially lower than those experienced in 1996, and lower than the low inflow conditions in 1997 and 1998. Overall, compared to the historical period, the fish community in Conowingo Pond experienced near-worst summer conditions in 1999. Water temperatures at the point of discharge were mostly 19 to 20°F above the Holtwood inflow temperatures and the ambient inlet temperatures. The heated effluent from PBAPS quickly dissipated within about 2 miles downstream of the discharge structure. The effluent affected the top S to 15 ft of the water column primarily along the western shoreline downstream to western and mid-pond areas at the PA/MD State Line. Except in surface and near surface waters, rise in temperatures (above the PBAPS inlet) at the State Line were generally less than 4°F. The overall pattern of vertical distribution of temperature in the water column at locations along the west shore in 1999 was similar to that observed in 1995 (also a period of low river flow and high ambient water temperature) when a minimum of three cooling towers operated. Despite high water temperature and record low river inflow conditions in summer 1999, DO values in the vicinity of PBAPS were good and reflected seasonal, spatial, and diurnal variations observed historically. A total of 15,328 fish representing 45 species plus one striped bass hybrid and 11 unidentified Lepomis spp. was collected. The most fish (5,507) were collected in June and the least (1,596) in August. The number of species collected per month was similar and ranged from 35 (July, August, and September) to 37 (June and October). Overall, spotfin shiner was the most abundant species in July, August, September, and October while gizz.ard shad dominated the catch in June. As in 1997 and 1998, the 1999 fisheries data for all gears revealed that most of the monthly catch per effort (CPE's) for the common and Environmental Protection agency designated species were within or above the historic range; CPE's among species and between stations were variable, likely due to differences J999PBAPSfnlrpt.doc- 02121100 ES-1 Normandeau Associates, Inc.
Report on Thermal Condltloaa and Fisb Populations in Conowingo Pond Relative to Zero Cooling Tower Opentloas at PBAPS, 1999 in year class strength, and no thermally stressed fish were observed. Overall, zero tower operation had no discernible effect on the integrity of the balanced, indigenous fish community of Conowingo Pond. l 999PBAPS.fnlrpt.doc - 01121100 ES-2 Normand"" A.lsoctatu, /nc.
Report on Thermal Conditions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 TABLE OF CONTENTS EXEClITIVE
SUMMARY
................................................................................................................ ES-I
1.0 INTRODUCTION AND BACKGROUND
2.0 ME1HODS.................................................................................................................................. 2 2.1 General Scheme............................................................................................................................ 2 2.2 Thennal Plume and Dissolved Oxygen (DO) Profiling....................................... -........................... 2 2.3 Fisheries Sampling and RecoMaissance Surveys............-............................................................... 2 2.3.1 Electrofishing........................................................................................................................ 3 2.3.2 Seine..................................................................................................................................... 3 2.3.3 Trap Net............................................................................................................................... 3 2.3.4 Trawl.................................................................................................................................... 3 2.3.5 Reconnaissance Surveys........................................................................................................ 4 2.4 Data Analysis............................................................................................................................... 4 3.0 RESULTS.................................................................................................................................. 15 3.1 Study Conditions........................................................................................................................ 15 3.1.1 Natural River Flow and Temperature.................................................................................. 15 3.1.1.l RiverFlow.................................................................................................................. 15 3.1.1.2 River Temperature...................................................................................................... 15 3.1.2 PBAPS Operational and Thennal Conditions....................................................................... 16 3.1.2.l Power Output.............................................................................................................. 16 3.1.2.2 In1et (Intake) Temperatures.......................................................................................... 16 3.1.2.3 Condenser Outlet and Discharge Temperatures............................................................ 16 3.2 Thennal and Dissolved Oxygen Conditions in Conowingo Pond.................................................. 17 3.2.l Thennal Conditions............................................................................................................. 17 3.2.2 Dissolved Oxygen (DO) Conditions..................................................................................... 18 3.2.3 Diurnal Variations in DO.................................................................................................... 18 3.3 Fisheries (Overall)...................................................................................................................... 34 3.3.1 Electrofishing...................................................................................................................... 34 3.3.2 Seine................................................................................................................................... 34 3.3.3 Trap Net............................................................................................................................. 35 3.3.4 Trawl Zones....................................................................................................................... 36 3.3.4.l Zone 405..................................................................................................................... 36 3.3.4.2 Zone 408..................................................................................................................... 36 3.3.5 Trawl Transects.................................................................................................................. 36 3.3.6 Reconnaissance Surveys...................................................................................................... 37 4.0
SUMMARY
AND CONCLUSIONS.......................................................................................... 65 5.0 LITERATURE CffED.............................................................................................................. 67 APPENDIX A-MONTIIL Y FLOW DURATION CURVES (JUNE-OCTOBER, HISTORICAL (1952-1998) VERSUS 1997, 1998, AND 1999) AND JOINT OCCURRENCE OF DAILY WATER TEMPERATURE AND RIVER FLOW (JUNE-OCTOBER, HISTORICAL (1956-1998), 1997, 1998, AND 1999 1999PBAPSfalrpt.doc- 02121100 Normandeau Associates, Inc.
Report on Thermal Conditions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 Table 2-1 Table 2-2 Table 2-3 Table 2-4 Table 2-5 Table 2-6 Table 3-1 Table 3-2 Table 3-3 Table 3-4 Table 3-5 Table 3-6 Table 3-7 Table 3-8 Table 3-9 Table 3-10 Table 3-11 Table 3-12 Table 3-13 Table 3-14 Table 3-15 Table 3-16 Table 3-17 LIST OF TABLES Description of thermal mapping locations sampled in the vicinity of PBAPS, June-October !999. Location of electrofishing stations sampled in Conowingo Pond, June-October 1999. Location of seine stations sampled in Conowingo Pond, June-October 1999. Location of trap net stations sampled in Conowingo Pond, June-October 1999. Location of stations 451 to 456 in trawl zone 405 and stations 481 to 486 in trawl zone 408 in Conowingo Pond sampled in June-October 1999. Location of trawl transect stations sampled in Conowingo Pond, JWle-October 1999. Swnmary of the mean and range of daily plant power output, temperature conditions, and river flows and temperatures (measured at Holtwood Dam) during thermal and fish population surveys conducted at zero tower operations at PBAPS, June-October 1999. Monthly mean river flow and water temperature at Holtwood Dam, May-October 1952-1998, and in 1995, 1996, 1997, 1998, and 1999. Joint occurrence of daily water temperature and river flow at Holtwood Dam, June-October 1956-1998, 1997, 1998, and 1999. Comparison of average monthly measured versus model-predicted condenser Lff at the Peach Bottom Atomic Power Station with both units operating at maximum power achievable, spring to fall 1993-1998, and 1999. Selected weekly thermal profile conditions at locations sampled in Conowingo Pond, June-October 1999. Comparison of the mean pro.tile water temperatures at western sampling stations on transects located downstream of the PBAPS discharge in August and September 1995 and 1999. Selected weekly DO profiles at transect locations in ConO\\vingo Pond, June-October 1999. Scientific and common names of fishes collected in 1998 in Conowingo Pond, June-October 1999. Number and percent composition of fishes collected by all gear types per month in Conowingo Pond, June-October 1999. Number and percent composition of fishes collected by DC Electrofisher per month in Conowingo Pond, June-October 1999. Monthly catch per effort (number per 30 minutes) for fishes collect.ed by a DC Electrofisher in Conowingo Pond, June-October 1999. Catch per effort (number per 30 minutes) for fishes collect.ed by DC Electrofisher at stations in Conowingo Pond, June-October 1999. Comparison of the monthly catch per effort (number per 30 minutes) for the common and Environmental Protection Agency designated, representative, important species collected at electrofishing stations in Conowingo Pond in June-October. Number and percent composition of fishes collected by 10 x 4 ft seine per month in Conowingo Pond, June-October 1999. Monthly catch per effort (number per collection) for fishes collected by a 10 x 4 ft seine in Conowingo Pond, June-October 1999. Catch per effort (number per collection) for fishes collected by I 0 x 4 ft seine at stations in Conowingo Pond, June-October 1999. Diversity and eveMess values for fishes taken by seine per month in Conowingo Pond, June-October 1999. J 999P.BAPS,falrpr.doc
- 02/] 1100 LI Normandeau Associate1. Inc.
Report on Thermal Conditions and Fish Populations in Conowlngo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 Table 3-18 Table 3-19 Table 3-20 Table 3-21 Table 3-22 Table 3-23 Table 3-24 Table 3-25 Table 3-26 Table 3-27 Table 3-28 Table 3-29 Table 3-30 Table 3-31 Table 3-32 Table 3-33 Table 3-34 Table 3-35 Table 3-36 Index of percent similarity of species composition between seine stations during zero tower operation in Conowingo Pond, June-October 1999. Index of percent similarity of species composition per month in Conowingo Pond, June-Octobcr 1999. Comparison of the monthly catch per effort (number per collection) for the common and Environmental Protection Agency designated, representative, important species collected at seine stations in Conowingo Pond in June-October. Number and percent composition of fishes collected by trap net per month in Conowingo Pond, June-October 1999. Monthly catch per effort (number per 24 h) for fishes collected by trap net in Conowingo Pond, June-October 1999. Catch per effort (number per 24 h) for fishes collected by trap net at stations in Conowingo Pond, June-October 1999. Comparison of the monthly catch per effort (number per 24 h) for the conunon and Environmental Protection Agency designated, representative, important species collected at trap net stations in Conowingo Pond in June-October. Number and percent composition of fishes collected by a 16 ft semi-balloon trawl per month in trawl zone 405, Conowingo Pond, June-October 1999. Monthly catch per effort (number per 10 min haul) for fishes collected by a 16 ft semi-balloon trawl in trawl zone 405, Conowingo Pond, June-October 1999. Catch per effort (number per l 0 min haul) for fishes collected by a 16 ft semi-balloon trawl at stations in trawl zone 405, Conowingo Pond, June-October 1999. Comparison of the monthly catch per effort (number per 10 min haul) for the common and Environmental Protection Agency designated, representative, important species collected at trawl zone 405 in Conowingo Pond in June-October. Number and percent composition of fishes collected by a 16 ft semi-balloon trawl per month in trawl zone 408, Conowingo Pond, June-October 1999. Monthly catch per effort (number per 10 min haul) for fishes collected by a 16 ft semi-balloon trawl in trawl zone 408, Conowingo Pond, June-October 1999. Catch* per effort (number per 10 min haul) for fishes collected by a 16 ft semi-balloon trawl at stations in trawl zone 408, Conowingo Pond, June-October 1999. Comparison of the monthly catch per effort (number per 10 min haul) for the common and Environmental Protection Agency designated, representative, important species collected at trawl zone 408 in Conowingo Pond in June-October. Number and percent composition of fishes collected by a 16 ft semi-balloon trawl per month at trawl transects in Conowingo Pond, June-October 1999. Monthly catch per effort (number per 10 min haul) for fishes collected by a 16 ft semi-balloon trawl at trawl transects in Conowingo Pond, June-October 1999. Catch per effort (number per 10 min haul) for fishes collected by a 16 ft semi-balloon trawl at stations on trawl transects in Conowingo Pond, June-October 1999. Comparison of the monthly catch per effort (number per 10 min haul) for the common and Environmental Protection Agency designated, representative, important species collected at trawl transect stations in Conowingo Pond in June-October. J999PBAPSfnlrpr.doc - 02121100 iii Normandeau Auociares, Inc.
Report on Thermal Conditions and Fish Populations la Coaowingo Pond Relative to Zero Cooling Tower Openeions at PBAPS, 1999 Figure 2-1 Figure 2-2 Figure 2-3 Figure 2-4 Figure 2-5 Figure 2-6 Figure 3-1 Figure 3-2 Figure 3-3 Figure 3-4 Figure 3-5 Figure 3-6 Figure 3-7 Figure 3-8 LIST OF FIGURES Thermal profiling locations in the vicinity of PBAPS. Map of Conowingo Pond showing distribution of electrofishing stations. Map of Conowingo Pond showing distribution of seine stations. Map of Conowingo Pond showing distribution of trap net stations. Map of Conowingo Pond showing distribution of stations in trawl zones 405 and 408. Map of Conowingo Pond showing distribution of stations in trawl transects 2, 4, and 7. Duration curve of average daily river flows at Holtwood Dam in June-October 1952 to 1998 and in 1997, 1998, and 1999. Duration curve of daily average river temperatures at Holtwood Darn in June-October 1956 to 1998 and in 1997, 1998, and 1999. Weekly mean percent of power output and condenser AT at PBAPS, June-October 1999. Weekly mean temperatures at Holtwood Dam and PBAPS inlet, June-October 1999. Average daily condenser outlet and canal outfu.11 temperatures at PBAPS, June-October 1999. Weekly mean canal outfall AT at PBAPS, June-October 1999. Weekly mean surface and bottom DO at transects sampled in the vicinity of PBAPS, June-October 1999. Comparison of AM versus PM DO at the surface and bottom at transects sampled in the vicinity of PBAPS in July through August 1999. 1999PBAPS.fnlrpLdoc
- 02121100 IV NormanddllM As1ociatu. Inc.
Report on Thenn.I Conditions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Opentions at PBAPS, 1999 l.O INTRODUCTION AND BACKGROUND In 1996 PECO Energy sponsored a study to determine whether the nwnber of cooling towers in operation at Peach Bottom Atomic Power Station (PBAPS) can be curtailed without adversely affecting the integrity of the balanced, indigenous fish community of Conowingo Pond. The study was coordinated with the Pennsylvania Department of Environmental Protection (PADEP). Pennsylvania Fish and Boat Commission (PFBC), Maryland Department of Natural Resources (MDNR), U.S. Fish and Wildlife Service (USFWS), and the Susquehanna River Basin Commission (SRBC). The primary reason for initiating the study was that the existing cooling tower operations were deemed conservative. They were based on a condenser design discharge water ll T of 20.8°F and the fishes were assumed to be in a trapped situation at PBAPS. The investigation occurred in June through October 1996 at three discrete cooling tower (zero, one, and two) operations and consisted of two components: relative abundance and distribution of fishes as measured by a variety of gears and evaluation of near-field and far-field thermal conditions. The results of the 1996 study (Normandeau Associates, 1997a) were presented and discussed with concerned resource agencies. The consulted agencies concurred with the conclusion that no meaningful differences occurred in the relative abundance, distribution or species composition in each of the three tower operating scenarios (zero, one and two towers); fish populations at 7.ero and two tower operation were similar. The report concluded that the integrity of a balanced, indigenous fish community in Conowingo Pond can be maintained at zero tower operation. Based on the results of the 1996 study, PECO requested that the PADEP eliminate the need for operation of any cooling towers. However, recognizing agency concerns with regards to conditions studied in 1996 (relatively high river flows and cool water temperatures), and that operational changes should not pose undue biological risks over the long tenn, PECO submitted a long-term monitoring plan at zero (no) cooling tower operation. This Study Plan (Normandeau Associates, 1997b), incorporated agency's comments and recommendations, provided for a three year monitoring program (1997-1999). The selected monitoring duration increased the probability of observing the potential effects of a wide range of conditions, and included contingencies in the unlikely event of unusual thennally-related fish activity. The P ADEP approved and incorporated the Study Plan in an amendment for zero tower operation, in the Station's NPDES pemrit. This report presents the results of thermal profiling and fish community monitoring in Conowingo Pond in June through October 1999; the final year of the three year monitoring program. Results of 1997 and 1998 monitoring were reported earlier (Nonnandeau Associates 1998, 1999). J999PBAPS[nlrpt.doc. 02121100 Normandeau Associate1, Inc.
Report on Thermal Conditions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Opentions at PBAPS, 1999 2.C METHODS 2.1 General Scheme The basic technical approach involved sampling at selected stations in Conowingo Pond at zero cooling tower operations within one week in each month (June through October 1999). Fish sampling occurred once and thennal plume mapping twice each sampling week. All surveys were conducted at prevailing river flow and temperature conditions in the last full week of each month and were completed in 4 to 5 days. Sampling effort was concentrated in the vicinity of PBAPS to better delineate the effects, if any, of zero tower operation on relative abundance and distribution of fishes. A similar approach, with concurrence of resource agencies, was taken in 1974-1976 to delineate the areas of fish avoidance in the vicinity of PBAPS and then again in 1993, 1995 and 1996 summer to evaluate thermal effects. The same field sampling protocols utilized during the pre-operational and post-operational periods and in 1997-1998 were used in 1999. A general description of the thermal mapping and :fisheries protocols employed are provided below. In addition to fisheries collections, reconnaissance surveys of the areas upstream and downstream of the discharge were conducted in July and August, in conjunction with weekly dissolved oxygen surveys requested by the PFBC. The surveys were conducted to document any potential fish stress as a result of zero tower operation, particularly in light of the hundreds of thousands of additional fish lifted into the Pond via operation of the fish passage facilities at Conowingo Dam. 2.2 Thermal Plume and Dissolved Oxygen (DO) Profiling Synoptic boat based surveys were conducted twice each fisheries sampling week to delineate the spatial extent of the thermal plume. These surveys were usually conducted at the beginning and end of each sampling week; one survey was conducted in an upstream to downstream direction and the other downstream to upstream. As shown in Table 2-1 and Figure 2-1, most transects selected for this monitoring were located downstream of the PBAPS discharge. Additionally, as requested by the PFBC, two sets of DO profiles (AM and PM) were taken one day a week (July and August) at selected locations (east shore, mid-pond and west shore stations) on the Fishing Creek, Burkins Run, and Williams Tunnel transects to provide an indication of near-field diurnal variation in DO. Most AM profiles were initiated between 0600-0800 hr, while the PM profiles were conducted between 1400-1700 h. At each transect location, water temperature and dissolved oxygen (DO) were measured at 5 ft intervals from the surface to bottom using Yellow Springs Instrumentation (YSI, Model 57 meters). The meters were calibrated/checked at each transect (the DO probes against the known solubility of oxygen in air saturated water, and the thermistors against an NIST certified traceable thennometer). Instrument operation and maintenance quality control checks were performed initially and at monthly intervals throughout the study. Measurements were recorded on standardized field forms (DO to the nearest 0.1 mg/I and water temperature to the nearest 0.2-0.3°C). DO and water temperature measurements on each sampling date were also complemented with daily temperature and river flow data (obtained from Holtwood Dam located about 7 miles upstream of PBAPS) and daily operational data from PBAPS (power level, condenser inlet and outlet temperatures, and temperature at the discharge canal outfall to Conowingo Pond). As in the case offish sampling, extensive monitoring ofthennal conditions (via hourly measurements and boat-based surveys) occurred during the pre-operational and post-operational periods. Detailed statistical analyses of these data., establishing the magnitude of natural variations and temperature rise due to power plant discharge, are provided in Purdy and Silver (1975a,b,c,d). 2.3 Fisheries Sampling and Reconnaissance Surveys Fishes were sampled by seine, trawl, and trap net at selected locations with emphasis on locations clustered in the vicinity of PBAPS (Tables 2-2 through 2-6; Figures 2-2 through 2-6). These loCations were also sampled during the pre-and post-operational periods (1966-1973 and 1974-1987, 1993, 1995, 1996, 1997 and 1998, respectively). Similarly, electrofishing occurred at sites that had been sampled earlier. /999PBAPS.falrp1 doc - 02121100 2 Normandeau As1ociate1, Inc.
Report on Thermal Conditions and Fish Populations in Conowlngo Pond Relative to Zero Cooling Tower Operations al PBAPS, 1999 Sampling with each gear type occurred once during the monthly sampling week. A complete sampling event consisted of the following: one set of seine collections; 48 hours of trap netting; trawl collections at Zones 405 and 408 and Transects 2, 4, and 7; and one set of electrofishing. A dt>.scription of each gear type and the disposition of the catch are given below. 2.3.1 Electrofishing Electrofishing was conducted at night at four stations (fable 2-2; Figure 2-2). Stations 161 and 190 are influenced by the thermal discharge from PBAPS. The electrofishing system consisted of a Coffelt VVP-15 variable voltage pulsator, powered by a 3.5 kW generator, and mounted in a 18 ft aluminum boat equipped with flood lights. Fishes were collected using pulsed DC current to minimize fish injury. Data recorded for each station included weather, date, time (start and end), air and surface water temperatures, voltage, and amperage. Sampling at each location consisted of a 30 minute run and was typically completed in one pass. The boat-mounted boom shocker was maneuvered slowly through the site, as close to shore as possible. Stunned fish were netted at the bow and placed in a live well. Large stunned specimens of conunon carp and quillback were not netted. but were counted by the netting crew and recorded. At the end of 30 minutes, the boat was returned to the center of the station, and the catch processed. Each fish was identified to species, fork length (FL) measured to the nearest mm, and released. When a collection contained more than 10 specimens of a single species, they were measured to the nearest 10 mm FL. If a collection contained more than 50 specimens of a single species, a subsample of 50 specimens was selected for individual processing, and the remainder counted and released. 2.3.2 Seine Seining was conducted at seven shoreline stations (Table 2-3; Figure 2-3). Station 214 is located within the PBAPS thennal plume. Data recorded at each station included weather, date, time (start and end), air and surface water temperatures, and estimated water depth. A 10 x 4 ft straight seine with Y. inch mesh was used. The seine was deployed and moved parallel to shore for a short distance, then moved into shore to trap fish. Since size and habitat of seine stations varied, effort was made to collect a representative qualitative sample based on complete coverage of all available habitats, rather than a specific number of hauls at each station. All specimens were identified, counted, and released near the capture site. Specimens that were too small to accurately identify in the field to the species level were only identified to the genus level. This was particularly pertinent to small sunfishes and clupeids. 2.3.3 Trap Net Trap nets were set at four locations (fable 2-4; Figure 2-4). Station 110 is within the PBAPS thennal plume. Data recorded at each station included weather, date, time (set and retrieve), Secchi disc transparency, air temperature, water temperature at the surface, 5 ft, 10 ft. and bottom. and water depth. The trap net consisted of a 3 x 6 ft trap with a 3 x 50 ft lead of Yl inch square mesh. Trap nets were set with the lead perpendicular to the shoreline. After 24 hours the nets were retrieved, the catch removed and processed, and reset for a second 24 hour period. All specimens in each collection were identified, measured to the nearest mm FL, and released. When a collection contained more than I 0 specimens of a single species, they were measured to the nearest 10 mm FL. If a collection contained more than 50 specimens of a single species, a subsample of 50 specimens was selected for individual processing, with the remainder counted and released. 2.3.4 Trawl Trawl surveys were divided into zones and transects. Two zones (405 and 408) and three transects (2, 4, and 7) were sampled (Figures 2-5 and 2-6). Zone 405 is affected by the thermal discharge while Zone 408 is considered a control (non-affected). Each zone consisted of three near-shore and three off-shore locations, while each transect was composed of an east shore, mid-pond, and west shore station. Transect Station 371 is influenced by PBAPS discharge. A description of all stations is found in Tables 2-5 and 2-6. Data recorded during each survey included weather, date, time (start and end). Secchi disc transparency, air temperature, water temperature at the surface, 5 ft, I 0 ft, and bottom, and water depth. A 16 ft semi-l999PBAPS.fnlrpt.doc - 0]J2JIOO 3 Normandt1au Assoclatt1s, Inc.
Report on Thermal Conditions and Fisb Populations In Conowingo Pond Relative to Zero Coolin~ Tower Operations at PBAPS, 1999 balloon trawl with~ inch mesh liner in the cod end was used to sample the zone and transect stations. The trawl was deployed off the stem of the boat and hauled for 10 minutes in an upstream direction. A minimwn of 7 minutes was required for the haul to be considered valid. After J 0 minutes the trawl was retrieved, the boat was returned to the center of the station, and catch was removed from the net and processed. All specimens in each collection were identified, measured to the nearest mm fork length, and released. When a collection contained more than 10 specimens of a single species, they were measured to the nearest I 0 mm FL. If a collection contained more than 50 specimens of a single species, a subsample of 50 specimens was selected for individual processing, with the remainder counted and released. 2.3.5 Reconnaissance Surveys In conjunction with weekly DO profiling in July and August, fish reconnaissance surveys were conducted throughout Conowingo Pond, from near Holtwood Dam downstream to Conowingo Dam. These boat-based surveys were performed specifically to document occurrences of any unusual thermally related fish activity. The surveys were conducted as precautionary measures due to the co-occurrences of relatively low and warm river inflows, zero tower operation at PBAPS, and the introduction of nearly 1,200,000 fish into the Pond during spring operations at the Conowingo Dam fish passage facilities. 2.4 Data Analysis Thennal and DO profiling, fisheries sampling, and related data were electronically processed and verified prior to analysis. For representation of average thennal conditions at transect locations during the fish sampling week each month, the profile data were pooled. Fisheries data from each gear types were compiled and expressed as catch per unit effort (CPE) by station, and month. Seine catches were expressed as number of each species per collection, while trap net catches were expressed as number of each species captured per 24 hours. The trawl data (transects and zones) are presented as number of each species per I 0 minute haul, with electrofishing data expressed as the number of fish captured per 30 minutes. For delineating the potential effects of zero tower operation on the fish community structure, indices of diversity and similarity were calculated as had been done in earlier pre* and post-operational studies for PBAPS. Species diversity indices (D) were calculated by the Shannon-Weaver ( 1948) method using the formula: s D= -2: P;Log1P; i=l where D is the species diversity index, S is the total number of species collected, and P; is the proportion of a species in the sample. However, results are not directly comparable since the number of species vary between populations. In order to equalize all values so they are comparable. evenness values were also calculated using the formula: H "'""'=log S where S is the number of taxa. Evenness values have a range from 0 to l.O with l.0 being the maximum equality for a community. Index of percent similarity (Whittaker and Fairbanks, 1958) was calculated to determine the similarity in species composition between stations and month. Titis index was calculated as follows: PSc= J00-0.52:1a-b I 1999PBAPSfnlrpt.doc
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NonnandeOll Associates, Inc.
Report on Thermal Conditions.ad Fish Populatioa1 in Conowingo Pond Relative to Zero Cooling Tower Opentlons at PBAPS, 1999 where PS is the percent similarity, a and bare percentages of a species at station A and B. Similarity values range from 0 (no similarity) to 100% (complete similarity). This index can be used to identify those stations that are most and least similar with respect to conunuruty structure. Data analyses were performed utilizing SAS and Microsoft Excel software. *
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Table 2-1 Description of thermal mapping locations sampled in the vicinity of PBAPS, June through October 1999. Location/ Mean Station Number Description Depth (ft) Holtwood Dam 100 PP&L's water temperature monitor located off the upstream end of the skimmer wall (about 7 miles upstream of the PBAPS intakes) PBAPS 001 Units 2 and 3 - condenser inlet water box temperature monitors 002 Units 2 and 3 - condenser outlet water box temperature monitors 009 Discharge canal - end of benn/outfall to Conowingo Pond Conowingo Pond Fishing Creek Transect (located approximately 1 mile upstream of PBAPS intalre) 101
- West shore, approximately 200 yards off Rollins Point 18 102*
Mid-pond, off the mouth of Fishing Creek 15 103* East shore, approximately 200 yards off the mouth of Fishing Creek 5 Burkins Run Transect (located approximately 600 yards downstream of PBAPS outfall) 201* West shore, approximately 75 yards off the mouth of Burkins Run 13 202 About 500 yards off west shore mid-way between Stations 201 and 203 14 203* Mid-pond off the mouth of Burkins Run 15 204 About 500 yards off the east shore mid-way between Stations 203 and 205 15 205* East shore, approximately 75 yards off shore 5 Wmiam s Tunnel Transect (located approximately 1. 2 mile downstream of P BAPS outfall) 30 l
- West shore, approximately 75 yards off McClellan's Rock 23 302 About 600 yards off west shore, mid-way between Stations 301and303 16 303*
About 600 yards off east shore, mid-way between Stations 302 and 304 16 304* East shore, approximately 75 yards off William's Tunnel 30 PA/MD Stateline Transect (located approximately 2 miles downstream of PBAPS outfall) 401 West shore, approximately 75 yards off shore and 500 yards downstream of the 13 mouth of Michael's Run 402 About 500 yards off west shore, mid-way between Stations 401and403 24 403 About 500 yards off east shore, mid-way between Stations 402 and 404 19 404 East shore, approximately 75 yards off Frazer Tunnel 40
- DO profiling (AM and PM) locations.
/999PBAPS.fn/rp1\\Tb ]./. 2121100 Normanclt!au Associales, Inc.
Table 2-2 Location of electrofishing stations sampled in Conowingo Pond, June through October 1999. Station Description 161 PBAPS discharge structure to approximately 500 yards downstream. 164 Southwest shoreline of Mt. Johnson Island. 165 East shoreline above Peters Creek. 190 Mouth of Michaels Run to 500 vards downstream. Table 2-3 Location of seine stations sampled in Conowingo Pond, June through October 1999. Station Description 202 Southeast shore of Sicily Island. 203 West shore of Big Chestnut Island. 208 Peach Bottom Beach. 209 Broad Creek at the boat launch. 210 Conowingo Creek at the boat launch. 212 Fishing Creek at the first road bridge upstream from the mouth. 214 Beach at the mouth of Burkins Run. Table 2-4 Location of trap net stations sampled in Conowingo Pond, June through October 1999. Station Description 104 100 yards directly off-shore from the PBAPS Unit 1. I 07 At the mouth of Broad Creek. 108 50 yards above the mouth of Conowingo Creek. 110 Off Burkins Run (Stonewall Point). J999PBAPS.falrp1\\Tb1 2-2.M.5.6. l/21100 Normandtl1111 A11ocrat111, Inc.
Table 2-5 Location of Stations 451 to 456 in Trawl Zone 405 and Stations 481 to 486 in Trawl Zone 408 iu Conowingo Pond sampled in June through October 1999. Trawls made at near-shore stations ~re indicated by odd numbers and off-shore stations by even numbers. Station 451 & 452 453 & 454 455 &456 481 & 482 483 & 484 485 & 486 Table 2-6 Location Zone 405 From a point off Stonewall Point to a point at the terminus of the PBAPS Discharge Canal (as of 1970 construction). Sampling is done on the river side of the canal and not in the canal. From a point approximately 50 yards upriver from the terminus of the PBAPS Discharge Canal (as of 1970 construction) to a point off the PBAPS Unit I. From a point off PBAPS Unit l to a point just above PBAPS Units 2 and 3. Zone 408 From a point approximately 300 yards below Peach Bottom Beach to a point off Peach Bottom Beach. From a point off Peach Bottom Beach to a point off the fonner lchthyological Associates dock. From a point off the former Ichthyological Associates dock to a point off the mouth of Peters Creek. Location of trawl transect stations sampled in Conowingo Pond, June through October 1999. Transect Location Transect 2 321 Off PBAPS Unit 2. 322 Mid-pond between Mt. Johnson Island and PBAPS. 323 Below Mt. Johnson Island. Transect 4 341 Broad Creek. 342 Mid-pond off Broad Creek. 343 Wildcat Tunnel. Transect 7 371 Burkins Run (Stonewall Point). 372 Mid-pond between Burkins Run and the fonner Ichthyological Associates d0ck. 3 73 lchthyological Associates Dock. 1999PBAPS.fnlrpt\\Tbs 2-2.M.5,6-212J/OO Normandeau Associates, Inc.
\\ Fishing Creek Inlet.001 BurtdnsRun 202 203 302 303 Figure 2-1 Thermal profding locations in the vicinity of PBAPS.
Re::reation Lake Muddy Run Pumped Storage Pond Muddy Creek F"'tshin g Creek N 0 Roll ins Peach Bottom Station Stonewall Paint ~-161 Johnson L Creek Peach Bottom Beach Williams Tunnel Tunnel 1 2 Glen Cove t Conowingo Figure 2-2 Map of Conowingo Pond showing distribution of electtofishing stations.
Muddy Run Recreation Lake Muddy Run Pumped Storage Pond Power Plant Muddy Creek Fishing Creek 0 Figure 2-3 Roi I ins Peach Bottom Station Broad Creek 1 2 3 Scale In Miles Johnson I. Peters Creek Peach Bottom Beach Frazer Tunnel Creek. Glen Cove Conowingo Map of Conowingo Pond showing distribution of seine stations.
Holt wood Run Recreation Lake Dam Pumped Storage Pond Muddy Creek Fishing Creek Roll ins Johnson L Peters Creek Peach Bottom Beach State Line _P_a_.. _ __;..M..;..i:..::c:.:..:h::a:.::el Md. 0 1 2 3 I I I I Scale In Miles Frazer Tunnel Glen Cove Conowingo Figure 2-4
- Map of Conowingo Pond showing distribution of trap net stations.
Run
Run Recreation Lake Muddy Run Pumped Storage Pond Muddy Creek Fishing Creek Roll ins State Line _P_a=*--.....:.tvf....;.;.;ic~h:.:.:::.a~el Md. Broad Creek 0 1 2 3 I I I t Scale In Miles Tunnel Glen Cove Conowingo Beach Run Figure 2-5 Map of Conowingo Pond showing distribution of stations in trawl z.ones 405 and 408.
Muddy Run Recreation Lake Muddy Run Pumped Storage Pond Muddy Creek Fishing Creek Roll ins Peach Bottom Station Stonewall State Line.... P...;a;;.;.*-~M...:.;i::.;:c:.:.;h:.:::a:.::.el Md. Broad 0 1 2 3 Scale In Miles Johnson I. Creek Peach Bottom Beach Williams Tunnel Tunnel Glen Cove Figure 2-6 Map of Conowingo Pond showing distribution of stations in trawl transects 2, 4, and 7.
Report on Thermal Conditions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 3.0 RESULTS 3.1 Study Conditions Thcnnal profiling and fishery surveys were conducted at prevailing river temperatures and flows, and operational and thermal conditions at PBAPS. Table 3-1 provides a sununary of the conditions experienced in each month. These conditions varied throughout the study. 3.1.1 Natural River Flow and Temperature 3.1.1.1 River Flow During the study, average daily river flows, as measured at Holtwood Dam. ranged from 2,200 cfs (13 August) to 54,400 cfs (18 September), with the monthly mean value highest in September (26,430 cfs) and lowest in July (4,994 cfs; Table 3-1). Except in September and October, the mean river flow for each monthly survey week was ~6,800 cfs in June-August. In September and October, the mean survey river flow was 26, 780 and 10,840 cfs, respectively. Compared to the historical flow record (1952-1998), average daily river flow in June 1999 was the lowest recorded for that month, as was that for May 1999 (Table 3-2). While not the lowest in the historic.al period, mean daily flows in July and August 1999 were the lowest for those months in the past 33 years, with flow for the period May-October 1999 the second lowest. Although river flows exceeded 20,000 cfs less than 25% of the time historically and in 1999; flows <10,000 cfs occurred nearly 65% in 1999 versus 42% of the time historically (Figure 3-1). The occurrence of flows <10,000 cfs in 1999 was similar to that in 1997 (the initial study year at zero tower operation) and greater than that in 1998 (the second study year). As in 1997 and 1998, river flows in 1999 were also much lower than flows in 1996 (the pilot study year for evaluating tower operation scenarios). River flows <10,000 cfs rarely occurred in 1996, with no values <7,500 cfs (Nonnandeau Associates, 1997a). Flow duration curves showing the historical versus 1997 to 1999 comparisons by month are provided in Appendix A. 3.1.1.2 River Temperature Average daily river inflow temperatures, as measured at Holtwood Dam (Table 3-1), ranged from 53.2°F (31 October) to 85.9°F (8 July). Mean inflow temperatures were ~80°F for the survey conducted in July (84.4°F), 74.9°F in June, 78.8°F in August, 65.6°F in September and 53.9°F in October. On a monthly basis, mean values were highest in July followed by August, June and September, and lowest in October. Compared to the historical June-October record (1956-1998), average daily inflow temperatures in 1999 were slightly lower (Figure 3-2). In both periods, inflow temperatures exceeded 80°F nearly 32% of the time, while the occurrence of temperatures in the range of 65 to 80°F was higher in 1999, and higher historically for temperatures >85°F. Compared to 1997 and 1998, inflow temperatures were slightly cooler in 1999. Because water temperature and river flow are important influencing variables, an analysis of their joint occurrence was performed to provide a perspective on conditions that fishes experienced historically, in 1999, and in 1997-1998. Table 3-3 provides the results ofthis analysis for the entire period of June through October. Appendix A shows the same analyses for each month. Historically, although water temperatures ~80°F occurred 35% of the time in June-October, they coincided with river flows <10,000 cfs nearly 21% of the time (Table 3-3). In 1999, the occurrence of water temperatures ~80°F was less (32% of the time), but jointly occurred with river flows <10,000 cfs nearly 32% of the time. In contrast, these temperature and flow conditions jointly occurred less than 5% of the time in 1996 (Normandeau Associates, 1997a). In addition, the overall occurrence (and joint occurrence with flows <10,000 cfs) of water temperatures ~80°F in June-October 1999 was greater than that which occurred in 1997, 1998, and in 1995 (the most recent period of high temperatures and near historic low river flows when cooling towers were in operation at PBAPS). In 1995, water temperatures ~80°F occurred jointly with flows <l 0,000 cfs about 29% of the time (Nonnandeau Associates, 1997a). 1999PBAPSfnlrpr.doc - 02121100 15 Normandea" Auociares, Inc.
Report on Therm*I Conditions *nd Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Opentlons *t PBAPS, 1999 3.1.2 PBAPS Operational and Thermal Conditions 3.1.2.1 Power Output The average daily power output ranged from 0 to 200% (the sum of both units) during the study period (Table 3-1). The station was operated at the maximum level of power achievable based on available fuel supplies. Figure 3-3 shows the weekly average power output in June-October 1999. Overall, maximum output (near 200%) declined in summer to near 150% in late September due to fuel depletion during the Unit 3 end of cycle coast down.. Except in early October when both units were shutdown, Unit 2 remained operational at 100% power during the Unit 3 refuel outage (30 September to 29 October). Full load (> 195%) was restored by 1 November. End of cycle coast down of one unit is an annual operational occurrence in spring to summer. As a result, the total power output of the station is less than the maximal 200% (Table 3-4). 3.1.2.2 Inlet (Intake) Temperatures During the study, the daily average temperature at the PBAPS inlet ranged from 54.4°F (27 and 28 October) to 86.5°F (1 August) (Table 3-1). Overall, daily inlet temperatures were highest in July (79.7-86.30F, with values >80°F on 30 of the 31 days) followed by August (76.6-86.5°F, with values >80°F on 21 days), and June (72.6-81.6°F, with values >80°F on 4 days) and lowest in October (54.4-66.9°F). Except for one day (2 July), inlet temperatures exceeded 80°F for a 56 consecutive day period (27 June-21 August). In July-August 1999 inlet temperatures ?:83°F occurred on 35 days compared to 3 and 13 days in 1997 and 1998, respectively (Normandeau 1998, 1999). Compared to corresponding river inflow temperatures measured at Holtwood Dam, inlet temperatures followed a similar pattern, but were generally higher (1 to 4°F) in June to August, with differences less than 1°F in September and October (Figure 3-4). 3.1.2.3 Condenser Outlet and Discharge Temperatures Condenser outlet temperatures reflect the wannest water available for discharge at PBAPS, the magnitude of which is dependent on the inlet water temperature and power output/heat loads. Excluding e.arly October when both units were shutdown, daily condenser outlet water temperatures ranged from 68.3 to 107.2°F, with survey and monthly mean values highest in July, followed by August, June and September, and lowest in October (Table 3-1). Corresponding average daily condenser.6.T's were 12.3 to 24.0°F based on the number of units and circulating water pumps in operation. The.dT's in late September and late October (Figure 3-3) were 4-6°F higher than nonnal due to the removal from service (for preventative maintenance) of one of the three Unit 3 main condenser circulating cooling water pumps.. Following the shutdown of Unit 3, mean condenser £\\T's in October were l 7-20°F wben Unit 2 operated at 100% power and three circulating water pumps (which represents half the total condenser outflow volume when both units are operating). Compared to 1993-1998, the decline in condenser.6.T's and power levels (when the units operated with six pumps) in 1999 was less than that observed in 1993-1998 (Table 3-4). The power levels and subsequent condenser AT's remained higher in 1999 as coast down started later and condenser cooling (heat transfer) was not as efficient due the warm ambient (inlet) cooling water temperatures (83-87°F) in July-August. Water temperatures at the end of the discharge canal (outfilll) represent the warmest water discharged to Conowingo Pond, the magnitude of which is dependent on the station power output/heat load and the number of circulating water pumps operating. In 1999, the daily average temperature of water discharged to Conowingo Pond ranged from 66. 7 to 106.5°F (Table 3-1). 1 Except for some minor As is evident in Table 3-1, some mean a11d/or range values given for the PBAPS discharge temperatures differ slightly from the corresponding condenser outlet value. These differences are attributed primarily to the measurement process for each location. Average daily condenser outlet temperatures reflect the mean of hourly measurements recorded to the nearest 0.1°F via multiple thermistors placed at the outlet side of WJ.it condensers, while the discharge temperature is the average of six readings per day (each taken at 4 hr intervals and recorded to the nearest l °F). J999PBAPS.[nlrpt.doc- 02121100 16 Normandeau Associates. inc.
Report on Thermal Conditions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 differences, the average daily discharge temperature generally approximated the average condenser outlet temperature throughout most of the study period (Figure 3-5). A summary of observed discharge.1.Ts (ca..rtal outfa!l temperature minus the inlet temperature) is provided in Figure* 3-6. Except in September and late October when only 5 circulating water pumps were in operation ac power, discharge.1.T's generally were less than the predicted design AT of 20.8°F. 3.2 Thermal and Dissolved Oxygen Conditions in Conowingo Pond 3.2.1 Thermal Conditions Thennal profiling was conducted on 11 weeks in June through October 1999 to evaluate the areas in Conowingo Pond affected by the thermal discharge. The nwnber of locations profiled on each transect included three for Fishing Creek, five for Burkins Run, and four each at Williams Tunnel and the P NMD State Line (fable 2-1; Figure 2-1). However, for brevity, only data from three locations on each transect downstream of the discharge are utilized in subsequent presentation and discussion. The locations selected were considered representative of thermal conditions observed across each transect: western area of Conowingo Pond, mid-pond. and eastern area. Respectively, the selected locations include Stations 201, 203, and 205 on the Burkins Run transect, Stations 301, 303, and 304 on the Williams Tunnel transect, and Stations 402, 403, and 404 on the PA/MD Stat.e Line transect. On the latter transect, Station 402 was considered more representative of thermal, flow, and depth conditions along the west shore than Station 40 l. Station 40 l was shallower and slightly cooler, perhaps influenced by inflow from Michael's Run (located approximately 500 yds upstream). The magnitude of the effect of the thennal discharge was evaluated by examining the differences in absolute temperature, or A T's (temperature at location/depth minus the corresponding PBAPS inlet temperature). Table 3-5 provides these differences by locations and depths for selected weeks in June through October 1999. Overall, the influence of the heated discharge from PBAPS, which dissipated rapidly within the two miles downstream to the State Line, was most evident at the West location on the Burkins Run transect, followed by the West and Mid-pond location on the Williams Tunnel transect. In addition, the heated effluent was limited to the top 5 to 15 ft of the water colunm, with the wannest water at the surface, at affected locations. Except at the West location on the Burkins Run transect, temperature differences between depths greater than 5 to 15 ft usually were within 2 to 4°F of that at the inlet. The highest temperatures in the water colwnn occurred at the Burkins Run West surface location (ATs varied from 7.5 to 13.9°F), with.1.T's at the bottom typically 2 to 4°F less than those at the surface. Compared to the PBAPS inlet values, surface values at locations across the State Line transect were 2.1 to 7.1°F higher, with 6.T's in most weeks ~4°F. The differences in.6.Ts among other locations and depths on transects downstream of the PBAPS discharge as well as the locations on the upstream transect (Fishing Creek}, generally were <3°F. Table 3-6 provides a general comparison of profile water temperatures measured at common locations (west shore) downstream of the PBAPS in August and September in 1995 (when a minimum of three towers operated and when high water temperatures coincided with low river flows) and in 1999 (zero tower operation). In August, daily river flows most often were <6000 cfs and daily intake temperatures >81°F in both years. In September 1995, daily temperatures were higher and daily inflows lower than observed in 1999. The prevailing river flows in August 1999 were the lowest experienced in August in the past 33 years, whereas those in 1995 were the second lowest. In August, discharge temperatures were higher at zero tower operation (1999) versus multiple tower operation (1995). However, the general effect of the higher discharge temperature on the vertical distribution of temperature at locations downstream of the discharge was not as readily apparent. Overall, at zero tower operation (1999) temperature profiles at downstream locations (particularly at Williams Tunnel and the State Line locations) were similar to those under multiple tower operations ( 1995). Although the mean discharge temperature in September was the same in both years, water temperatures at locations downstream of the discharge were lower in 1999 due to the higher and cooler inflow conditions. /999PBAPS.fnlrpr.doc. 02/lJ/(J(J 17 Normandeau Associat11s, Inc.
Report on Thermal Conditions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 3.2.2 Dissolved Oxygen (DO) Conditions DO profiling was conducted in conjunction with thermal surveys, and in July through August included two sets of profiles (AM and PM) on a weekly basis at west, mid-pond, and east locations on three transects (Fishing Creek, Burkins Run, and WilliantS Tunnel) as requested by the PFBC. Tiae locations* used in subsequent presentation are the same as those selected above for thennal profiling. As appropriate, corresponding values at depth from locations on a given transect were pooled to represent DO conditions and trends observed during the study period. Figure 3-7 summarizes weekly DO (surface and bottom) conditions. Overall, DO varied seasonally and was higher at the surface than at the bottom, trends commonly observed in the historical period (RMC, 1985) and in temperate waters. In most weeks, surface DO values were >7 mg/I, differences between transects usually were <l mg/I, and DO was not consistently higher or lower at any given transect (Table 3-7). However, corresponding bottom DO values were lower in June-August, particularly at the deeper water stations along the east shore on Williams Tunnel and the State Line transects. During this period, mean bottom DO was <5 mg/I, while values exceeded 5 mg/I at other times. At the Fishing Creek transect (located upstream of PBAPS) and Burkins Run transect (located just downstream of the PBAPS discharge) DO values in bottom waters remained >5 mg/I throughout the study period. Overall, bottom DO was consistently higher at the Burkins Run and Fishing Creek transects, and lowest at the State Line transect. Although mean bottom DO was usually lower than corresponding surface values (Table 3-7), the magnitude of difference in most weeks was <2 mg/I at the Fishing Creek Transect, <l mg/I Burkins Run Transect, while differences exceeded 3 mg/I at the Williams Tunnel and State Line transects. The weekly mean value for each of these transects reflected the contribution of the low bottom DO in the deeper waters primarily along the eastern shore (Station 304 on the Williams Tunnel transect and 404 on the State Line transect). Overall, DO in bottom and near bottom waters at theses locations in summer 1999 generally was lower than conditions observed in 1997 and 1998 (Normandeau 1998,1999). The lower DO conditions in 1999 were attributed to the e"'1ended period of record low inflows in May-August. 3.2.3 Diurnal Variations in DO In July through August the weekly survey included two sets of profiles (AM and PM) at selected locations on the Fishing Creek, Burkins Run and the Williams Tunnel transects to evaluate diurnal variations. These profiles were taken to evaluate the potential near-field effects of zero tower operation on diurnal variations in DO. Figure 3-8 provides a comparison of the AM and PM mean DO values at the surface and bottom on sampled transects. Throughout the period, surface PM values were higher than corresponding AM values at transects located downstream of the PBAPS discharge (Burkins Run and Williams Tunnel), while the same occurred in most sampled weeks at the upstream Fishing Creek transect. Generally, the difference between surface AM and PM values was within 1 to 3 mg/I, with slightly higher values at transects located downstream of the PBAPS discharge. During most survey weeks, diurnal variation in DO was also evident in bottom waters. However, the difference between AM and PM values at the bottom was usually less than that observed in surface waters. Overall, under the warm water temperature and record low river flow conditions experienced in summer 1999, DO conditions in the study area were good and reflected seasonal, spatial, and diurnal variations observed under similar flow and temperature conditions historically (RMC, 1985). /999PBAPSfnlrpr.doc
- 02121100 18 Normandeau Associatu, Jnc.
Table3-1 Summary of the mean and range of daily plant power output, temperature conditions, and river flows and temperatura (measured at Holtwood Dam) during thermal and 6sh population surveys conducted at zero tower operations at PBAPS, June-October 1999. June Jull August Sel!tember October Survey Period (Weck of) 20 Jun 25 Jul 22Aug 19 Sep 240ct Power Output (%)1 Survey Mean 200 199 190 180 129 Survey Range 199-200 198-200 183-193 179-181 102-184 Monthly Mean 197 198 193 172 92 Monthly Range 168-200 169-200 165-199 80-189 0-196 Inlet Temperature (0f) Survey Mean 76.3 85.l 79.l 65.2 54.5 Survey Range 74.7-78 0 84.7-86.3 78.7-79.5 64.6-66.1 54.4-54.8 Monthly Mean 77.2 83.6 82 71.7 59.4 Monthly Range 72.6-81.6 79.7-86.3 76.6-86.5 64.6-79.3 54.4-66.9 Condenser Outlet Temperature (0f) Survey Mean 96.7 105.7 98.6 87.9 71.2 Survey Range 95.1-98.4 105.2-107.2 98.2-99.1 87.1-89.5 68.3-76.7 Monthly Mean 97.6 104.2 102.2 91.I 74.5 Monthly Range 93.4-102.2 100.1-107.2 96.1-107.0 79.3-98.5 65.1-81.0 Discharge (Outfall) Temperature (°F) Survey Mean 96.3 104.9 98.1 87.8 70.9 Survey Range 94.7-97.8 104.3-106.5 97.8-98.5 86.5-89.0 68.5-75.7 Monthly Mean 96.9 103 101.6 91.1 74.7 Monthly Range 93.2-101.0 98.7-106.5 96.3-105.8 81.2-97.6 66.7-80.8 Actual6T ("F)1 Survey Mean 20.4 20.6 19.5 22.7 4 16.6 Survey Range 20.4-20.5 20.5-20.9 19.0-19.8 22.0-24.0 4 13.6-22.1 4 Monthly Mean 20.5 20.6 20.2 19.4 15.0 Monthly Range 18.9*21.8 19.7-20.9 19.0-21.l 12.3-24.0 4 0.2-23.3 4 Design AT (0 F)3 20.8 20.8 20.8 20.8 20.8 River Flow (cfs) Survey Mean 6,160 3,720 6,800 26,780 10,840 Survey Range 5,000-7,400 3,600-3,900 5,400-10,100 21,900-30,300 10,100-11,800 Monthly Mean 7,010 4,994 5,158 19,687 19,329 Monthly Range 4,400-11,600 3,400-7,500 2,200-15,200 3, 700-54,400 8,900-42, I 00 River Temperature {°F) Survey Mean 74.9 84.4 78.8 65.6 53.9 Survey Range 74.5-75 1 84.3-84.7 78.2-79.4 64.6-66.5 53.6-54.S Monthly Mean 76.6 82.7 80.8 71.6 59 Monthlv Ranize 72.9-79 3 78.0-85.9 76.3-84.5 64.4-78.9 53.2-67.4 The tolal station percent power o,utput (Unit 2 8:. Unit 3). Ma.'Cimum slation output is 200% when both unil.9 operate at 100% powa-. The values in J1111e through September reflect the maximum output achievable due to end of cycle coast down for Unit 3. Unit 3 wu ahllldawn for rcfueliq on 30 September and restored to nev 100% power load in late October. 2 AclUal dT (condenser outlet tcmpcratun: minus inlet temperature) lllCUUl'1td during the sllldy. 3 Desi1111 condenser 4T criteria for bolh units opcratins 1t 100°1" power with 1ix circul1ling water pumps. 4 One Un.it 3 circulatias pump was out of 1ervicc; a tolal of only 5 pumps wen: operational for 11 days at the end of September, and 7daysiD1a1c October. Thil resulted in I d T that WU 4-6°f higher than what would have a<:eWTCd with Ill pumps operating. 1~99PBAPS.falrptl11> 3 2/WOO
Table 3-2 Monthly mean river Row and water temperature at Holtwood Dam, May-October 1952-1998, and in 1995, 1996, 1997, 1998, and 1999. Period May June July August September October Ma2'.-0ctober Flow (cfs) 1995. 22,752 20,223 15,545 5,745 3,703 23,997 15,364 1996 82,229 28,833 26,368 15,942 39,813 52,487 41,017 1997 30,968 24,710 8,794 7,613 7,897 7,068 14,489 1998 75,255 26,430 22,184 7,019 4,843 7,461 23,955 1999 19,939 ** 7,010.. 4,994 5,158 19,867 19,329 12, 708 ** 1952-1998 49,239 29,935 16,940 12,042 13,331 18,766 23,504 Water Temperature {°CJ 1995. 65.3 76.l 80.6 84.3 76.8 64.6 74.6 1996 61.6 77.0 79.3 81.3 72.6 59.3 71.8 1997 62.8 75.8 83.4 80.9 74.4 63.2 73.4 1998 65.6 74.5 80.0 81.3 76.7 65.6 74.0 1999 67.8 76.6 82.7 80.8 71.6 59.0 73.l 1952-1998 63.8 74.9 81.l 80.9 75.0 62.5 73.0 1995 is the most recent period of high water temperarures and near record low river flows when cooling towers were in operation at PBAPS. Mean daily river flows in May and June 1999 set a new record low for those months, while the flows for July and August 1999 were the lowest in the last 33 years. J999PBAPS.falrpt/Tb 3 2nJIOO Normandeau A.uoc1aw, Inc.
TableJ-3 Joint occunence of daUy water temperalure and river Oow al Holtwood Dam, June-October 1956-1998, 1997, 1998, and 1999. Daily Average 40-49 River Flow (crs) No. Pct. <2,SOO 2,.S00-4,999 S,000-1,499 7,S00-9,999 10,000-14,999 15,000-19,999 20,000-29,999 30,000-39,999 40,000-SO,OOO >.S0,000 Total < 2,SOO 2,500-4,999 S,000-7,499 7,S00-9,999 10,000-14,999 15,000-19,999 20,000-29,999 30,000-39,999 40,000-SO,OOO > 50,000 Total < 2,500 2,S00-4,999 S,000-7,499 7,500-9,999 10,000-14,999 IS,000-19,999 20,000-29,999 30,000-39.999 40,000-50,000 > so.ooo Total < 2,500 2,500-4,999 S,000-7,499 7,500-9,999 10,000-14,999 IS,000-19,999 20,000-29,999 30,000-39,999 40,000-S0,000 > S0,000 Total 1999/'BAl'S.fnlrpt/T'b 3.3
- 2121/00 2
20 23 0 0 0 0,02 0.03 0.31 0.36 O::ailv A\\'erai;e Tempcratun: ( 0 "------------ 50-59 60-69 70-79 No. Pct. No. Pct. No. Pct. 22 0.34 S9 0.92 35 0.55 67 I.OS 49 42 19 27 74 394 0.77 0.66 0.30 0.42 1.16 6.15 7 4.58 1956-1991 8 0.12 11 0.17 102 l.S9 219 3.42 170 2.65 283 4.42 151 2.36 267 4.17 174 2.72 481 7.Sl 116 l.81 461 7.20 124 l.94 483 7.54 71 Lii 227 3.54 34 0.53 103 1.61 119 1.86 118 1.84 1.069 16.69 2.653 41.43 0.65 17 11.11 16 10.46 4 2.61 11 7.19 s 3.21 6 3.92 10 6.S4 3 1.96 4 2.61 3 1.96 2 1.31 2 1.31 80-85 No. Pct. 10 0.16 277 4.33 334 S.22 361 S.64 479 7.48 228 3.S6 138 2.lS 42 0.66 13 0.20 8 0.12 J,890 29.51 6 3.92 IS 9.80 14 9.lS 16 10.46 3 1.96 7 4.58 37 24.18 47 J0.72 54 35.29 3 l.96 3 1.96 0.65 10 6.54 s 3.27 I 0.65 17 11.JJ 22 14.38 2 1.31 8 S.23 7 4.S8 22 14.38 9 S.88 2 1.31 13 8.SO s 3.27 10 6.54 s 3.27 4 2.61 0.6.S 2 1.31 11 7.19 6 3.92 2 1.31 10 6.54 3 l.96 2 1.31 2 l.31 31 20.26 58 37.9J 59 38.56 8 5.23 12 7.84 4 2.61 2 1.31 2 1.31 28 J8.30 12 7.84 27 17.65 9 5.88 6 3.92 2 1.31 I 0.65 l 0.65 l 0.65 59 38.56 3 1.96 28 18.30 IS 9.80 2 1.31 48 31.37 >liS No. Pct. 9 0.14 108 1.69 138 2.15 71 I.I I 41 0.64 7 1 375 0.11 0.02 5.86 s 3.27 2 1.31 0.65 8 5.23 2 1.31 2 1.31 0.65 1 0.65 Total No. Pct. 38 0.59 728 11.37 984 IS.37 885 13.82 1,242 19.39 861 13.44 789 12.32 3S9 S.61 179 2.80 339 S.29
- 6. 404 J ()(), 00 0
7 60 31 28 13 7 3 2 2 4.58 39.22 20.26 11.30 8.SO 4.58 1.96 l.31 1.31 153 100.00 0 24 42 24 l.S 10 19 IS 4 15.69 27.45 lS.69 9.80 6.54 12.42 9.80 2.61 /SJ JOO.DO 3 l.96 40 26.14 43 28.10 12 7.84 16 10.46 IS 9.80 14 9.IS .s 3.27 2 1.31 3 1.96 J53 JOO.DO
Table 3-4 Comparison of average monthly measured versus model-predicted condenser /1 T at the Peach Bottom Atomic Power Station with both units operating at maximum power achievable (and six circulating water pumps), Spring to Fall 1993-1998, and 1999. N represents the number of days. Total Power Condenser 11 T (°F) Month N Output (o/o) Predicted Observed Difference 1993-1998 April 41 195 20.8 19.4 1.4 May 129 189 20.8 18.8 2.0 June 173 184 20.8 17.9 2.9 July 168 178 20.8 17.4 3.4 August 159 170 20.8 16.7 4.1 September 74 163 20.8 16.0 4.8 October 30 190 20.8 18.7 2.1 1999 April 4 200 20.8 20.7 0.1 May 31 200 20.8 21.l -0.3 Jwie 30 197 20.8 20.5 0.3 July 31 198 20.8 20.6 0.2 August 31 193 20.8 20.2 0.5 September a 19 177 20.8 18.4 2.4 October b 20.8 a Due to the operational loss of one Unit 3 circulating water pwnp, only S pumps were operational on 11 days in late September. b Unit 3 was in outage from 30 September until restored to near 100"/ci power in late October. During the Unit 3 outage, Unit 2 operated at 100% power on 16 days; condenser i11's were 12.3 to 15.?°F on those days.. 1999PBAPS.fnlrpt\\Tb 3 212/100 Nonnanrleau AssocJar.s, Inc.
T1bltl*5 Stttcted wetkly thmnll pra01e candlflont (nprnttd u 6T
- tfmpentun at locaUoll/depth minus the tomtspolldtn1 PBA.PS Inlet ltmpenlure} 11 IO('ttlons 11mpltd In Cono"1ngo Pond, Jam..Odobtr l9Yf.
(For tnns<<t locations \\Y
- west.em am; M
- mkl-pond; ind It
- tuttrB am) 10 June*
Dtrtb W M I!:
- 1.4
- l.1
- I.I
-0.4 .29
- l.l 10
.34 IS -3.6 Bo,_
- 3 6
- l.3
- 4.0 16.2 19.1 Bw,4fru Riot 11 9
... s .t.4 10 t l.I 10 93 1.0 15 -1.2 Donom 9 o
- 1.2 3.5 Jf.'11liolft1 ruftMI I.I 6.7 S.I u
63 u \\0 1.7 4.6 I.I 15 4 0 4.0 20 0.7 1.4 21 Bottom 0,0 -0.1 -0.4 PAI/JD si,,,. t.... 3.9 4.0 4.2 36 3.1 3.7 10 3.6 3.5 u I! 3.6 2.5 10 l.2 0.2 25 0.3 -0.6 30
- I.I 35
-1.S 40 Bonmn O.J 26
- I.I
- Filll-lin&lll""')'Mdt II July W
M E -0.I
- U
- l.S
-0.6
- 2.9
.1.5 -0.6
- 2.9
-1.0
- 2.9
- l.9
-1.9 -1.0 !l.I 19.7 111 l 9 I 1 101 l5 19
- 11 7 9
- l.4 I 1 It 0
3,9 66 0 )9 16 35 LI 2.1 17 l.l -19 ll 2.1 11 11 11 2.1 ll 11 19 19 1.7 1.1
- II
-13
- I 3 I 4 1.9
- 1.3
- Tho -
tcmp<falllra ("f).--d.. ""'PBAPS Inlet (lnoludcd r..... r.._.i 199'11'/JAP$/~ J.J.1-1/ZllOO 15 Ju1r W M E -0.4
- 1.6 O.D 1.3
- l.I
-0.l
- 2.0
- 1.1
- 2.1
-2.3 0.4 14.t 19.6 11.9 4.1 31 11.9 4.2 10.4 9.l 1.6 l.O 9.6 6.5 4.1 1.3 6.3 4.7 I.I U 41 3.1 2.9 -0.1
- 1.7 l.O 2.1
- l.7 16 u
4.1 I.I 4.6 U 4.7 '-4 4.l l.1 2.9 I.I -0.1 -0.9
- l.3 1.4 I.I
-0 3 Wttkar IAu1ust W M
- 2.1
- 2.3 0.4
- O.l
-2.3 0.4
- 2.l 0.4
- 2.3
-07
- 0.7 au 19.6 IJ.9
- 6. 7 6.1 13.0 1.3 0.4
-0.5 12.1 -0.1 4.7 9.4
- 3 6.7 76 7 I 6.l I.I 49 4.9 1.2 l.l 0.4 3.1 0.9
-0.1 1.1
- .o 4.o 4.0 3.1 3.6 3.s 33 3l 3.1 3.1 2.7 2.t 1.1 l.2 1.1 l.l I.I u
l.1 0.9 ll Aueust* W M E -0.1
- H
- 1.6
- l.O
-H -1,6
- 2.1
- 2.1
- 2.3
-4. I 7U 19.I 9.5 0.1 1.6 I.I O.l I.I
- I.I 1.4 l.l 6.1 l.9 7.0 l.7 5.7 u
4.1 2.1 2.3 2.0 0.7 1.4 0.3 5.3 4.3 4.0 u 4.3 4.0 4.1 0 3.9 4 2 3.7 u ).) 1.1 1.2 16 3.7 0.4 IV M E -0.1 -0.I -0.3 -0.1
- 0.5
-0.4 -0.I -0.6 -0.4 -0.6 65.1 23.1 11.6 0.6 0.6 10.l 0.6 4.0 -0.2 0.3 1.9 t.I I.I 1.7 0.1 0.7 1.0 -0.I 0.1 0.2 -0.1 0.2 -0.l -OJ I.I U 4.2 3.1 3.7 l.6 1.3 I.I 1.7 0.7 2.4 0.3 l.l 0.9 0.6 0.1 I.I 0.0 IV I £
- 2.1
- 1.0
-0.6 -0.6 .1.5
- I.I
-0.1
- 1.6
- I.I
- 1.6
- I.I
-0 I 5U 14.7 7.1 0 4 -0,4 7.3 0.3 6.1 0.0 6.3 0.0 -0 1 H 1.6 ll 1.5 I.I 1.2 0.7 U.I 1.2 0.7 0.1 0.9 0.1 01 0.1 0.1 0.6 4.2 3.1 1.] 4.1 u 23 3.7 3.1 13 3.3 26 2.3 3.3 1.9 I.I 1.6 1.6 I.I J.I 13
Table 3-6 Comparison of the mean (and range) profile water temperatu~ {F) at western sam11ling stations on transects located dowHlream of the PBAPS discharge in August and September, 1995 and 1999. AUS!!St. Stplember
- 1995 **
1999 *** 1995 ** 1999... Depth Mean Range Mean Range Mean Range Mean R11ngc PBAPS Discharge 90.3 88.5-90.8 100.8 97.8-104.2 88.9 85.7-91.0 88.9 88.8-89.0 Burkins Run (20/) 0 87.3 84.2-92.3 93.1 85.6-98.2 84.8 82.4-87.8 78.4 77.0-79.7 s 87.I 84.2-92.3 91.9 84.2-96.8 84.7 82.4-86.9 ?6.3 75.6-77.0 10 87.8 85.1-92.3 85.I 83.3-86.9 70.0 68.0-72.0 15 87.4 85.1-91.4 84.2 83 3-86.0 Bottom 86.6 84.2-89.6 90.6 82.8-95.0 84.5 82.4-86.9 69.8 68.0-71.6 Wil//ams Tunnel (301) 0 88.? 87.8-89.6 90.S 86.4-95.9 74.7 7J.8-75.6 s 87.8 87.8-87.8 89.4 86.0-95.0 68.5 67.1-69.8 10 86.9 86.0-87.8 87.4 83.8-91.0 66.8 66.2-67.S IS 86.9 86.9-86.9 85.2 81.S-89.6 66.0 65.8-66.2 Bottom 86.0 86.0-86.0 83.6 78.8-88.2 66.0 65.8-66.2 State line (401) 0 83.5 82.4-86.0 86.9 84.2-90.0 81.7 ?8.8-84.2 71.6 69.8-73.4 5 83.6 82.4-86.0 85.9 82.4-89.6 81.1 78.8-82.4 68.9 67.1-70.7 10 85.7 82.2-89.6 67.1 66.2-68.0 15 85.S 82.2-89.2 66.S 65.8-67.1 Bottom 83.S 82.4-86.0 83.7 80.6-87.8 81.3 78.8-83.3 65.9 65.8-66.0
- In 1995. profiles were taken daily from 25-31 August and 1*12 September when PBAPS opcra!N a minimum ofl cooling lowcn. In 1999, profiles were token on 5 days in August and 2 days in September during zero tower operation.
.. In August and September 1995, daily nver innows were <6000 cfs on most days, with inlet tcmpcmtures typically >8l"F in August and >7S"F in September.
- tn 1999, daily mnows were <5000 cfs on most days in August. but >10,000 cfs in September. Inlet temperatures typically were >81"F in Augusl nnd >61\\"F in September.
J999PBAPS.fnlrpt/Tb J 2121/00 NormonJ~au AsJ<<1ot*1. Inc.
Tabltl*7 Stlected meldy DO rwonln 1t lnnsec1 lontJon1 (W
- Wfflem *mi M
- mld~pondt 1nd E - nstms art*) In Conowlnp Pond. Junt.OCto~r 1999.
Buriiru R11n PAMD Stat* LtrM 10 June:* Dtplh W M E 0 16 7 0 10 6.6 u 6.J eon.... 6 o 7.6 7.7 10 7.1 Bonom 7 9 7.1 6.1 10 6.1 U S.I 20 2S Donom 3.4 1.7 1.S 10 1.0 u 7,7 20 S.J 2S 30 n 40 Booom 2.S u 9.4 1.6 7.7 !.I 102 l.J 1.3 6.S ! I 6.1 7.1 7.4 7.0 7.J 6.9 7.1 S.I 6.4 4.1 1.0 4.0 3.5 l.J 7.7 1.2 7.7 I.! 7.4 6.! 4.0 2.9 2.4 2.2 2.0 !.I 1.9 II July W M E 6.0 !.9 !.9 !.I !.7 7.1 7.1 7.1 7.1 7.1 6.1 6.0 45 7.0 6.7 6.6 6.4 !.4 7.3 7.3 7.1 7.1 7.1 7.0 6.4 6.1 6.1 6.7 6.! !.9 6.7 6.6 6.6 6.4 14 u 12 1.1 69 6.9 6.9 6.1 6.6 6.1 56 46 37 66 6.S 6.) 6.1 6.1 6.1 H 4.3 4 I 39 W M E l.D 70 6.7 6.2 7,1 7.2 7.1 1.0 7.9 7.7 5.6 6.4 6.1 S.l 7.4 7.l 7.1 6.0 6.1 6.9 7.1 6.6 6.1 6.1 6.3 6.1 !.9 4.7 l.6 2.7 2.2 2.9 3.2 1.2 7.2 6.6 7.0 6.9 6.1 6.1 6.4 !.9 6.1 6.2 l.3 1.6 1.6 0.6 0.1 l2 u 1.4 \\\\ttkof 8 Aaaust W M E 6.1 6.9 6.9 6.9 6.9 1.0 1.0 1.0 9.0 1.6 7.1 6.1 9.4 1.0 1.0 7.0 4.0 JS 1.2 11 79 6.6 7! 6.9 70 73 7.1 1.4 1.0 1.0 s.o 16 IS 79 6.9 6.1 I.I 1.6 6.6 9.D I.I I.I 4.! S.4 s.o 4.1 1.7 1.6 7.6 6.4 3.9 3.1 3.5 3.9 4.0 l9 W M
- f.
6.6 6.! 6.4 6.4 6.4 7.2 7.1 7.0 7.1 6.1 6.1 6.! !.4 7.4 7.l 7.2 7.2 !.3 6.9 6.9 S.I 7.1 6.1 6.0 7.1 7.1 7.l 6.4 7.2 7.2 6.9 7.1 6.9 6.9 6.7 S.3 S.! 7.2 7.2 7.2 7.1 7.0 7.0 6.4 6.6 6.1 6.0 19 5'ptnnbrr* W M E 1.7 B.6 IS 1.5 1.2 1.2 8.0 1.0 1.4 14 1.4 l.S IO I.! 1.4 1.3 I.! IJ 1.2 1.2 l.l 1.2 12 K.2 1.l 7.1 1.5 1.5 l.J 1.1 1.7 1.6 1.4 1.1 10 I.I I.I I.I 10 16 1.6 1.6 1.6 I.! I.! l.J 1.7 16 1.6 1.6 I.! I.! 1.4 IS u 1.2 14 Octotwr* W M t 10.1 10.0 10.0 10.0 99 10.0 10.0 9.9 10.0 10.0 10,0 99 9.9 91 10 I 9.9 9.7 9.9 9.7 9.9 9.1 9.7 9.6 9.6 9.7 10.1 9.7 9.4 9.4 9.4 9.3 9.2 9.2 !J.7 '1 9.6 9.S 9.! 9.6 !t.6 9.S 9.! 9.1 9.1 9.1 9.1 9.6 96 9.S 9.! 9.S 9.S 9.! 9C 94 94 93 93 93
Figure 3-1. Duration curve of daily average river temperatures ( F) at Holtwood Dam, in June - October 1952 to 1998 (historicaQ and in 1997,1998, 1999. 45000 F 40000 L 0 35000 w 30000 25000 I N 20000 15000 c 10000 F 5000 s 0 I I I I I I I I I 1 I i_ _ _i ___ ___ i ______ J ______ J ______ J ______ J ______ J ______ 4 ______ 4 ______ 4 I I I I I I I I I t t I I I I I I I I I I I I I I I t-~---7------f------7----- ---- -~------~------i------~------~------~ I \\ I I I I I I I I I I +--t-~\\.- :-- ----+------+------+------+------+------+------~------+------~ I I I I I I I tf I ~ - - -,.... : ~ -
~------4------~ ------
~ - -----~------~------~------~------~ I I I I I I I I I I I I I I I I I I I +----!.-+.---- -~------~------~------~ -- ----~------~------~------~------~ \\ : I I t I I I +--- --- ~ ------ ~-
~
- --~ - -----~------
- ~
1 I I ~----- - ~ ---- ~ - ~-~--'}.. __ _ I --~------~------,------~ I I I" " I ' I I ~ - ---- - ~ ------ ~ -.:-:-: -*: ~ - ~ ---'":;:...."*"'---...::. -- ~ --- -
-- "T -
- ~ - - ~ - - ~ I I I I
- 1
- -- ~--==::r-I I
t I I I I I I *
- ~--
I I I ~ ------+ ------ f - - - - - - ~ - - - - - - ~ - - - - - - ~ - - - ~ - : ~-- ~ -~- 1' - - ---.;::;_;:;_~-.~::===-~:==:-:...O-;;::;;;;:: - -{ I I I
- t
- I I
I I I I I I I I I I I I T------T------,------T------,------1 ------1------1------1------ 1------, I 0 YEAR 10 20 1952-98 I 30 I 40 50 60 % TIME EQUAUED OR EXCEEDED
- 1997 1998 70 80 90 100 1999
Figure 3-2. Duration curve of daily average river temperatures (0F) at Holtwood Dam, in June - October 1956 to 1998 (histoncaO and in 1997,1998, 1999. 95 LL w 90 CI
- J 85
~ ffi 80
- n.
~ 75 f I I I I I I I I I I r - 'T - r - r - r - I I I I I I I 1 I I I I I I I I I I I l I I ..l. - -L - 4- - .i. - ~
- l I
I I I I I I I I I I I I I I I I -I - I - I - I - "'i - - I-I - I I I I t I t'- "f* - t-I I I I w I I I I I I I 1* I-I I I I I I I I I 70 ~ :- - - - - - - ~ - - - - - - -:- - - - - - - ~ - - - - - - ~ - - - - - - -:- - - - - - - ;_ - - - - - - -r ~ ~-c. ------ ~ -------! CI I I I I I I I I t""'"- I I I I I I I I I I I-~ I I ~ 65 ~ - - - - - - + - - -- -- -:- - - -- -- ~ -- -- - - ~ - --- -- -:- -- - --- ~ --- -- - ~ -- - -:_ _. -~* -.- - ~ - - -- ~ I I I I I
- '\\_
I ~60 :-------+-------:-------~------~-------:-------~------~-------:-----~--}; -\\-'~ I I I I 55 "t - r- - ~ - ~ - -~- - ~ - I I I I I I 1 I I I I 1 1 I 11 1 1 I 1 1111 1 11 l 1111 l* 111 l 1111 I 1 1 0 10 20 30 40 50 60 70 80 90 100 % TIME EQUALLED OR EXCEEDED YEAR 1956-98
- rn91 1998
- - *
- 1999
220 22 200 20 180. 18 160. ~ t.. 16
- 140 Q,
t>
- i 14 =
0 0 .. 120 41 ~ 0 i:i.. 12 100 _.,._ Power Output _._Condenser Delta T 10 80 60. 40 +-~~---,-~-..-~,----..~-.-~-.-~.----.-~-.-~..---.~~~.-~~-.-~--.-~,----.~-,-~~~ 30 May 13 Jun 27 Jun 11 Jul 25 Jul 8 Aug 22 Aug 5 Sep 19 Sep 3 Oct 17 Oct 31 Oct 1999 (Week of) Figure 3-3 Weekly mean percent(%) power output and condenser ~T ("F) at PBAPS, June-October 1999. J 999PBAPS/"Crpt!Fg1J.J,,,J,6*112/IOIJ NtJrmanJttruAunctatt.1, Inc.
85 60 _._ PBAPS Inlet ....,.__ Holtwood Dam so +---.~~,..-~--.-.---.--.---.-.---....---..---.,..---.--.-.---.....,...--.-.---.....---...---.--.~--.....................................,_.............,__.. 30 Mny 13 Jun 27 Jun II Jul 2S Jul 8 Aug 22 Aug 5 Sep 19 Sep J Oct 170ct 31 Oct 1999 (Weck of) Figure J-4 Weekly mean temperatures {°F) at Holtwood Dam and PBAPS inlet, June-October 1999. /P99PBAl'S.f*lrp//Fg1 J.J,l.J.6. JIJl/00 Non,.011decm A.t!ot*mttts, Inc
I IO IOS - 100 Ii:' 95 e.. ~ = e 90
- x. e..
85 -Condenser Outlet
- Discharge Canal Outfall 80 75 '
70 31 Mny 14 Jun 28 Jun 12 Jul 26Jul 9 Aug 23 Aug 6 Sep 20Sep 40ct 180ct I Nov 1998 (Week of) Figure 3-5 Average daily condenser outlet and canal outfall temperatures (0F) at PBAPS, June-October 1999. / 999PBAPS,fnlrpt!Fg1 J.J,4,3,6. 2111/00 Norma11d1nu Auoclot*,. ltte
24 - 22 20 18 - E 16 '"" !! 14
- g 12 10 8
- 6 30Mny 13 Jun 27 Jun 11 Jul 25 Jul 8Aug 22Aug 5 Sep 19 Sep 3 Oct 17 Oct 31 Oct 1999 (Week of)
Figure 3-6 Weekly mean canal outfall ~T (outrall °F minus inlet 0F) at PBAPS, June-October 1999. 1999PBAPSfnlrptlF1* J-1,4,J,6-2121/r>O NannantJ.av A11ocla111, /nc.
~ ,g_ g u ,g_ 0 Q 11.0 SURFACE DO !0.0 9.0 8.0 7.0 6.0 50 4.0 20 Jun 4Jul 11 Jul 18Jul ...,._Fishing Creek ..._Williams TuMel 2S Jul I Aug 8 Aug 1999 (Wttk of) ...,._Burkins Run -State Linc IS Aug 22 Aug 19Sep 240ct 12.0 -r----------------------------------------, BOTTOM DO -e-Fishing Creek _.,_Burkins Run 10.0 r-------------i...,_Williams TUIUICI -State Linc 8.0 6.0 4.0 0.0-4-----------------------------..-----------....... -~--1 20 Jun 4 Jul 11 Jul 18 Jul 2S Jul I Aug 8 Aug IS Aug 22 Aug 19 Sep 240ct 1999 (Week of) Figure 3-7 Weekly mean surface and bottom DO at transects sampled in the vicinity of PBAPS, June-October 1999. J999PBAPS/nlrpr/Fgs J-7,8-2121100 Normandeau Associates, Inc.
13.0 SURFACE 12.0 11.0 E' 10.0 .. s 0 9.0 Cl ~
- Fishing Creek 8.0
- Burkins Run 7.0
_.Williams Tunnel 6.0 5.0 ~.o 6.0 7.0 8.0 9.0 10.0 11.0 12.0 AMDO(m&/I) 11.0 BOITOM 10.0 9.0 8.0 'i 7.0 .§. g 6.0
- '1 5.0 II.
- Fishing Creek 4.0
- Burkins Run 3.0 A Williams Tunnel 2.0 1.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 AM DO (111111)
Figure 3-8 Comparison of AM versus PM DO (mg/I) at the surface and bottom at transects sampled in the vicinity of PBAPS in July through August 1999. Solid line represents line of equality. 13.0 11.0 l 999PJJAPS.fnlrpt/Fgs 3-7.8 - 2121100 Normande1J11. A.uociates, inc.
Report on Thennal Conditions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 3.3 Fisheries (Overall) Sampling occurred on five occasions in June through October at zero cooling tower operation. A list of scientific and common names of species collected is found in Table 3-8. A total of 15,328 fish representing 45 species plus one striped bass hybrid and l l unidentified Lepomis spp. was collected (Table 3-9). Spotfin shiner, gizzard shad, channel catfish, bluegill, tessellated darter, bluntnose minnow, and smallmouth bass comprised 84% of the 1999 catch. June accounted for the most fish (5,507) collected in a single month, while the least ( 1,596) was collected in August (Table 3-9). In 1998, July accounted for the fewest fish collected (3,525) while August accounted for the most fish (5,309). Number of species observed per month was similar and ranged from 35 (July, August, and September) to 37 (June and October). Spotfin shiner was the most abundant species in July, August, September, and October while gizzard shad dominated the catch in June. 3.3.1 Electrofishing A total of 3,520 fish representing 26 species was collected (Table 3-10). Bluegill, smallmouth bass, gizzard shad, green sunfish, and largemouth bass comprised nearly 82% of the catch; all other species individually made up less than 4% of the total. Number of species between months varied and ranged from 13 (July) to 21 (September). The catch increased steadily from June, peaking in September, and declined in October. The most common species collected during each month were similar. These were bluegill, smallmouth bass, gizzard shad and green sunfish. The species with the highest overall catch per effort (CPE) value was bluegill (49.35) while CPE values for smallmouth bass (31.40) and gizzard shad (30.60) were similar (Table 3-11). Species CPE varied by month (Table 3-11). Bluegill, smallmouth bass, gizzard shad, and green sun.fish ranked in the top five during all sample periods while spotfin shiner ranked among the top five in two of the five sample periods. The only other species that ranked in the top five was comely shiner during the August sample period. The highest CPE (345.25) for all species combined occurred in September and the lowest CPE (89.25) in June. Overall, the number of species collected at each station varied slightly (Table 3-12). At stations 161 and 190 (both located within the influence of the thermal plume), 19 and 17 species were collected at each location, respectively. Stations 164 and 165 (outside the influence of the thermal plume) contributed 19 and 22 species, respectively. Generally, CPE values for bluegill were highest and nearly identical at stations 165 and 190 with giu.ard shad having the highest CPE value for any species at station 164. Smallmouth bass had the highest CPE value at station 161. Comparison of monthly CPE's for the 1997-1999 sampling effort and the historical data for common and important representative species are shown in Table 3-13. Little historical data were available for the period June through September; however, 76 of the 105 calculated monthly CPE's were within or above the range observed historically. White crappie CPE values for July through October were lower than the historical range, possibly due to variations in year class strength from year to year. Strong populations of gizzard shad, now bolstered by introductions from the Conowingo Dam East fish lift, may be outcompeting white crappie for available food during critical juvenile stages. High fluctuations in year class strength of white crappie have been observed historically. Smallrnouth bass CPE values for June, July, August, and September were higher than those obsetved historically, while CPE values for largemouth bass were generally similar or above those values recorded historically. 3.3.2 Seine A total of 6, 714 fish representing 31 species plus eleven unidentified Lepomis spp. was collected (Table 3-14). Spotfin shiner, bluntnose minnow, and tessellated darter dominated the catch. These three species comprised over 81 % of the total catch by seine~ all other species individually made up less than 2.2% of the total. The lowest number of species collected ( 19) occurred in September while the highest number of species (25) occurred in June. The largest number of fish collected by seine (l,686) occurred in 1999PBAPS.fnlrpt.doc
- 02121100 34 Normandeau As~ociottu, lnc.
Report on Thermal Conditions and Fish Populalions in Conowingo Pond Relative to Zero Cooling Tower Opentions at PBAPS, 1999 September, whereas the lowest number collected (815) occurred in August. Spotfin shiner dominated the catch during all five sampling events. The number of species and specimens collected was variable over the sampling period. This was largely :i factor of the mobility and growth of young fish. The highest overall monthly CPE occurred i.t1 September (240.86) while the lowest value occurred in August (116.44; Table 3-15). Spotfin shiner was the most conunon species collected with a mean monthly CPE of 119. l 7. Bluntnose minnow and tessellated darter ranked second and third, respectively. The number of species collected varied by station (Table 3-16). The most species (25) were collected at station 212 while the fewest (8) were collected at station 209. The total number of species collected was 31 plus eleven unidentified Lepomis spp. Spotfin shiner, bluntnose minnow, and tessellated darter were the most common species in the catch. All monthly CPE values were within or above the historical range from 1997 to 1999 (Table 3-20). During the three year study, bluntnose minnow had CPE values higher than the existing range on six occasions while spottail shiner, largemouth bass, and tessellated darter had values greater than the existing range on at least three occasions. CPE values for smalhnouth bass and pumpkinseed were each higher during one of the sample periods. Diversity and evenness values by month are presented in Table 3-17. The values range from 0.370 (September) to 0.819 (June), similar to what was observed previously. Calculated diversity values were low due to the dominance of a few species, mainly spotfin shiner. Percent similarity values between stations are found in Table 3-18. Variation in PSc values was evident between stations. Station 212 appeared to be the least similar to the others, possibly due to habitat differences, since this station is located in Fishing Creek, unlike the others which are located within Conowingo Pond. Percent similarity values between months are found in Table 3-19. 1be similarity in catch was high (>77%) between August, September, and October. Values for June were relatively low as compared to other months whereas July values were similar for each monthly comparison except for September. 3.3.3 Trap Net A total of 656 fish representing 21 species was collected (Table 3-21 ). Five species comprised over 77% of the catch. They were white crappie, channel catfish, bluegil~ gizzard shad, and common carp. Number of species collected ranged from l 0 in June to 17 in September. Overall catch per effort values ranged from 4.70 in June to 31.81 in September (Table 3-22). White crappie ranked first with a mean CPE of3.65. Channel catfish and bluegill ranked second and third with mean CPE values of2.77 and 2.57, respectively. By month, white crappie had the highest CPE values in September and October while bluegill, gizzard shad, and channel catfish were dominant in June, July, and August, respectively. The nwnber of species collected at each station was variable (Table 3-23). Number of species ranged from 11 collected at station I 08 to 17 at station 110 which is located within the influence of the thermal plume. Gizzard shad and channel catfish were the dominant species collected at station 110 while white crappie dominated collections at stations 104, 107, and 108. Eight species were collected at all four stations. These were white crappie, channel catfish, bluegill, gizzard shad, common carp, green sunfish, largemouth bass, and pumpkinseed. Most of the common and important representative species have monthly CPE values within the historical range from 1997 to 1999 (Table 3-24). Twenty-four of the 135 sample periods (17.8%) had CPE values less than the historical range. Monthly CPE values were generally lower for brown bullhead, channel catfish, pumpkinseed, and white crappie from July through September, while CPE values for bluegill, gizzard shad, smalhnouth bass, largemouth bass, and walleye were consistently within the historical range during most sampling events. J999PBAPS.fnlrpt.doc. 02121100 35 Nonnandeau Associates, Inc.
Report on Thenn111I Conditions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 3.3.4 Trawl Zones 3.3.4.1 Zone 405 A total of74lfish representing 15 species was collected in 1999 (Table 3-,25). Channel catfish was the dominant species and accounted for more than 75% of the total catch. Channel catfish along with tessellated darter comprised nearly 92% of the catch. The remaining 13 species were collected in low numbers, infrequently, and represented slightly more than 8% of the total catch. By month, the highest overall CPE value occurred in June (67.25) with lower values observed from July through October (Table 3-26). The lowest vaJue (6. 74) occurred in August, possibly due to the severe drought conditions the region experienced this summer. Except for tessellated darter in July, channel catfish had the highest CPE values of any species during each monthly sampling event. The number of species collected per station varied and ranged from four at station 452 to 9 at station 455 (Table 3-27). Except for station 456, where tessellated darter dominated the catch, channel catfish was dominant at all other stations. Monthly catch per effort values for the commonly collected species were within or greater than the range of the historical data from 1997 to 1999 (Table 3-28). The CPE values for tessellated darter were generally higher than the existing range from June through September with some higher CPE values for channel catfish, largemouth bass, and spottail shiner observed during July and August sampling periods. 3.3.4.2 Zone 408 A total of 840 fish of 14 species was collected (Table 3-29). Five species comprised 91% of the catch. They were gizzard shad, channel catfish, tessellated darter, blunblose minnow, and bluegill. Gizzard shad dominated the catch in June with channel catfish dominant during July and August. Channel catfish, pumpkinseed, and bluegill were collected during each sampling event, whereas gizzard shad and tessellated darter were present in four of the five collections. Overall monthly CPE values varied and ranged from 2.50 in September to 114.28 in June (Table 3-30). Strong numbers of gizzard shad and tessellated darters collected in June accounted for the higher CPE value observed. Catch per effort values were relatively strong in June but drastically decreased from July through October. Catch per effort values of certain species varied by station (Table 3-31). Gizzard shad, channel catfish, bluegill, and tessellated darter were present at all six stations whereas pumpkinseed and largemouth bass were collected at five of the six stations. The relative abundance of all commonly collected species except for white crappie was generally within or above the historic range of monthly CPE values from 1997 to 1999 (Table 3-32). During the 3-year study period, monthly CPE values higher than the historic range were usually observed during June or July for bluegill, giu.a.rd shad, smalbnouth and largemouth bass, tessellated darter, and spottail shiner. 3.3.5 Trawl Transects At trawl transect stations, a total of 2,857 fish representing 19 species was collected (Table 3-33). Thrc::e species, gizzard shad, channel catfish, and tesselJated darter comprised more than 94% of the catch. Only one other species individually, bluegill, made up more than 1 % of the catch. The remaining species were collected in low numbers and infrequently. The number of species collected by month was similar and ranged from 8 in August to 13 in June (Table 3-34). The highest overall CPE (270.80) occurred in June with the lowest value (5. 76) observed in October. Gizzard shad had the highest mean CPE overall and dominated the catch in June while channel catfish had the highest CPE vaJues in July, August, and September. Bluegill had the highest CPE value in October. The number of species collected at each station was generally similar (Table 3-35). Number of species ranged from four (Station 371) to 11 (Stations 343 and 373). Catch per effort values at each station were variable. Station 3 71 had the lowest CPE of any station. 1bis was probably due to high current velocity precluding full utilization of the area by young-of the year fishes, which typically dominate trawl J999PBAPSfnlrpt.doc - 02121100 36 Normandeau Associates, Inc.
Report on Thermal Conditions and Fish Populations In Conowingo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 catches. Channel catfish dominated the catch at stations 321, 342, 372, and 373 with gizzard shad most abundant at stations 323 and 341. Tessellated darter had the highest CPE values for stations 322 and 343. The CPE of all commonly collected species (except for white crappie during four sampling events and one event each for channel catfish and spottail shiner) were within or above their*historic range of values from 1997 to 1999 (Table 3-36). CPE values higher than historical values were observed often during the 3-year study for largemouth bass, tessellated darter, smallmouth bass, and gizzard shad. 3.3.6 Reconnaissance Surveys Weel<ly fish rccormaissance surveys were conducted throughout Conowingo Pond in June through August, with three additional surveys conducted in August at river inflows <3,000 cfs. These boat-based surveys were performed to document occurrences of any unusual thermally related fish activity, particularly with the introduction of nearly 1,200,000 fish {including 950,000 gizz.ard shad) into the pond via spring fish passage operations at Conowingo Dam. These surveys revealed no wiusual fish activity~ no thermally stressed fish were observed. However, a total of 410 dead fish (comprised primarily of gizzard shad, followed by American shad, channel catfish and carp) was observed throughout the Pond. Nearly 60% of the dead fish (primarily gizzard shad, channel catfish, carp, and American shad) were observed in the four weeks surveyed in Jwie. All were in various stages of decomposition, and mortality probably was due to post-spawning stress. During the low flow surveys in August, no dead fish were observed in the PBAPS discharge or downstream areas. Fish activity throughout this area in mid-July through August included predator species feeding on large schools of gizzard shad. J 999PBAPS.falrpt.doc - 0212J100 37 Normandeau Aswclat6s, Inc.
Table 3-8 Scientific and common namu or fishes collected In Conowlngo Pond, June-October 1999. Clupeidnt llerrlnJ!! frtaluridae, contin11rd Alosa sapidiulma Amencan shad Ameluros natali.* Dorosoma c*pedianum G17.7.ard shnd Amriuros nrb11/osus /eta/uni.* p1111cto111s Cyprinidne Camposroma a110111a/11m C li11os1011111s f1111du/0tdts Cn1rin11s cmpio Notropis b11ccat11s Eroglosrnm 111axi/li11g11a Nott111igrm11s c1ysolr11cas Notropls amot1111s l.wcilus corn11111s Not1'0pls lt1uhm1/11.r Not1'0pis pl'Ocn* Notropis robe/lus Cyprinel/n spi/opt*ra Notropls \\'0/11cellus Pimeplrales noratus Rltinichrhys atrawlus Rhiniclttlrys cataractae Semol//us otro111ac11/atus Sematilus corpora/is Catostomldat Cmpiodes cyprinus Catostomus commersoni llypente/ium nigricamt Moxostoma mocroltpidatum /Clahlrldat Ameluros catus /999P/UPS.fal'7'11Tb U
- 2nl/OO Cnrp* nnd minnows Central stoncrollcr Rosys1dc dace Common corp S1lvcrJDW mmnow Cuthps mmnow Golden shiner Comely shmcr Common shiner Spoltatl shmer Swallowta1l shincr Rosyfocc !hmer Spolfin shiner Mimic shiner Bluntnose minnow Blacknose dace Longnosc dace Creek chub Fallfish Sue ken Quillback White sucker Northern hogsuckcr Shortheod rcdhorsc Bullhead catnshu W1Utec11tfish Cj71rinodontidat F1md11/11,r diaphmms Pm:ichth.1*/dae Marone americana M soTatilis x M cl11ysops Cttnlrarchidne Amblop/i/~s mp~.wu lepomis sp upomis auritus uponrls cyon~/1111 upom/J gibbos11s upomis 111acroc/1i111s Micropt~rvs dolo111ie11 MiCl'opteros salmaid~s Pomoxis annularis Pomoxls nlgronrac11/at11s Pucidae Ethtostoma blenniordts Etheos/01110 olnllltdi Ptrcajlawsctns Perclna caprodu Ptrclna pttltala Stlzosttdlon vUnum Bullhead catfisheJ, continued Yellow bullhead Brown bullhead Channel catfish Klllinshu Banded k1lhfish Temperate baueJ Wh1teperch Sir 1ped bnss x while bas Sunlhhu Rock bass Lepom1ssp Redbreast sunfish Green sunfish Pumpkm1Ced Bluegill Smollmoulh bass Largemouth bass White crappie mack crappie Perches Greenside darter Tessellated darter Yellow perch Logperch Shield darter Walleye
Tablc3-9 Number and percent composition or fishes coUectcd by aU gear types per month In Conowingo Pond, June-October 1999. J1U1c JlllJ. __ A~ Se2tcmber October OveraU Number Percent Number Percent Number Percent Number Percent Nwnbcr Percent Numbcl' Percent AmeriQall shad 0 0.00 0 0.00 0 0.00 0 0.00 1 0.05 1 0.01 Gizurd shad 2,188 39.73 283 11.76 260 16.29 166 4.S6 122 5.59 3,019 19.70 Cenlral stoncrollcr 2 0.04 0 0.00 0 0.00 0 0.00 0 0.00 2 0.01 Rosyside dace 8 0.15 6 0.25 13 0.81 .32 0.88 8 0.37 67 0.44 Common carp 21 0.38 20 0.83 11 0.69 46 1.26 49 2.25 147 0.96 Cudips minnow l 0.02 4 0.17 1 0.06 0 0.00 I 0.05 7 0.05 Golden shiner 0 0.00 1 0.04 12 0.75 2 o.os 0 0.00 IS 0.10 Comely shiner IS 0.27 13 0.54 63 3.95 14 0.38 43 1.97 148 0.97 Common shiner 21 0.38 14 0.S8 10 0.63 7 0.19 3 0.14 SS 0.36 Spottail shiner 15 0.27 37 1.54 0 0.00 7 0.19 20 0.92 79 O.S2 Swallowtail shiner 2 0.04 3 0.12 2 0.13 0 0.00 0 0.00 7 0.05 Rosyface shiner 0 0.00 4 0.17 I 0.06 I 0.03 0 0.00 6 0.04 Spotfin shiner 647 11.75 794 33.00 558 34.96 1,427 39.22 882 40.44 4,308 28.11 Blunlnose minnow 325 5.90 402 16.71 41 2.57 35 0.96 82 3.76 885 S.11 Bladcnose dace 9 0.16 0 0.00 3 0.19 8 0.22 3 0.14 23 0.15 Longnose dace l 0.02 s 0.21 1 0.06 I 0.03 I 0.05 9 0.06 Creek chub 15 0.27 16 0.67 6 0.38 JO 0.27 0 0.00 47 0.31 F.Ufish 3 0.05 0 0.00 0 0.00 0 0.00 0 0.00 3 0.02 Silverjaw minnow 0 0.00 0 0.00 2 0.13 0 0.00 0 0.00 2 0.01 Mimic shiner s 0.09 44 l.83 l 0.06 3 0.08 33 I.SI 86 0..56 Quillback 54 0.98 9 0.37 B o.so 6 0.16 7 0.32 84 o.ss White sucker 73 1.33 42 1.75 11 0.69 2 0.05 14 0.64 142 0.93 Nor1bern bogsucker 0 0.00 0 0.00 0 0.00 0 0.00 4 0.18 4 0.03 Shor1head redhorse 8 O.IS 9 0.37 s 0.31 5 0.14 14 0.64 41 0.27 White catfish 3 0.05 2 0.08 0 0.00 1 0.03 1 0.05 7 o.os Yellow bullhead 2 0.04 l 0.04 2 0.13 5 0.14 4 0.18 14 0.09 Brown bullhead 4 0.07 2 0.08 6 0.38 16 0.44 1 o.os 29 0.19 Channel catfish 731 13.27 175 7.27 190 11.90 313 8.60 110 5.04 1,519 9.91 Buided killifish I 0.02 1 0.04 0 0.00 0 0.00 1 0.05 3 0.02 White perch 0 0.00 0 0.00 1 0.06 7 0.19 1 0.05 9 0.06 Rock bass 4 0.07 8 0.33 8 0.50 25 0.69 33 1.51 78 0.51 Redbreast sunfish 11 0.20 0 0.00 1 0.06 2 0.05 2 0.09 16 0.10 Green sunfish 46 0.84 71 2.9S 33 2.07 148 4.07 100 4.59 398 2.60 Pumpkinsc:ed 21 0.38 23 0.96 30 1.88 73 2.01 37 1.70 184 1.20 Bluegill 130 2.36 118 4.90 138 8.65 669 18.39 313 14.JS 1,368 8.92 Smallmoutb bass 156 2.83 95 3.95 83 S.20 277 7.61 108 4.95 719 4.69 Largemouth bass 101 1.83 38 1.58 43 2.69 203 S.58 99 4.54 484 3.16 White c:n.ppie s 0.09 13 0.54 13 0.81 87 2.39 36 1.65 l.54 1.00 Black crappie 0 0.00 0 0.00 0 0.00 1 O.oJ 1 o.os 2 0.01 Lcpomissp* 11 0.20 0 0.00 0 0.00 0 0.00 0 0.00 11 0.07 T cssellated darter 850 15.43 134 S.57 21 l.32 27 0.74 26 1.19 l,OS8 6.90 Yellow perch 2 0.04 I 0.04 0 0.00 I 0.03 4 0.18 B o.os Logperch 14 0.25 16 0.67 16 l.00 7 0.19 2 0.09 SS 0.36 Shield darter 1 0.02 0 0.00 0 0.00 0 0.00 0 0.00 1 0.01 Walleye 0 0.00 I 0.04 I 0.06 3 0 08 14 0.64 19 0.12 Slriped bass hybrid* 0 0.00 0 0.00 0 0.00 I 0.03 0 0.00 I 0.01 Grecoside darter 0.02 0.04 0.06 0 0.00 0.05 4 0.03 Overall 5,507 JOO 2.406 100 1.596 100 3.618 JOO 2.181 100 15,328 100 Number 0£ soec1es
- n 35 35 35 J7 45
- Not counted as separate species.
J 999PBAl'S.fnlrpl!Th 3-9
- 1/l 1100 N°""oruk1111Aaoaal11, Inc.
Table l-10 Number and 11crcent composicion of fishes collected by DC electrofisher per month in Conowingo Pond, June-October 1999. June Jull Aue!!~C Sel!ccmber October Overall Number Percent Number PercenL Number Percent Number Percent Number Percent Number Percent Gizzard shad 29 8.12 184 43.09 173 32.34 105 7.60 121 14.76 612 17.39 Common carp 1 0.28 7 1.64 s 0.93 II 0.80 27 3.29 51 1.45 Golden shiner 0 0.00 0.23 12 2.24 I 0.o7 0 0.00 14 0.40 Comely shiner 14 3.92 l 0.23 49 9.16 14 1.01 43 S.24 121 3.44 Spottail shiner I 0.28 0 0.00 0 0.00 2 0.14 I 0.12 4 0.11 Spolfin shiner so 14.01 23 5.39 17 3.18 27 1.96 19 2.32 136 3.86 Bluntnosc minnow 0 0.00 0 0.00 I 0.19 0 0.00 0 0.00 I 0.03 Quill back 0 0.00 0 0.00 8 uo 2 0.14 7 0.85 17 0.48 While sucker 0 0.00 0 0.00 0 000 0 0.00 14 1.71 14 0.40 Shorthcad rcdhorsc s 1.40 4 0.94 5 0.93 4 0.29 10 1.22 28
- J.80 White catfish 0
0.00 0 0.00 0 0.00 1 O.Q7 0 0.00 I 0.03 Yellow bullhead I 0.28 0 0.00 2 0.37 0 0.00 4 0.49 7 0.20 Brown bul\\hc.'ld 0 0.00 0 0.00 0 0.00 l 0.07 0 0.00 I 0.03 Channel catfish 27 1.S6 17 3.98 26 4.86 18 1.30 23 2.80 111
- us Rock bass 3
0.84 8 1.87 6 1.12 18 1.30 16 l.9S SI 1.45 Redbreast sunfish II 3.08 0 0.00 I 0.19 2 0.14 I 0.12 15 0.43 Green sunfish 45 12.61 46 10.77 31 S.79 140 10.14 100 12.20 362 10 28 Pmnpkinsced I 0.28 0 0.00 5 0.93 38 2.75 7 0.8S 51 1.45 Bluegill 48 13.45 36 8.43 117 21.87 SSS 40.19 231 28.17 987 28.04 Smallmouth bass 118 33.0S 84 19.67 65 12.lS 261 18.90 100 12.20 628 17.84 Largemoulh bass I 0.28 IS 3.51 10 1.87 176 12.74 82 10.00 284 8.07 While crappie 0 0.00 0 0.00 0 0.00 2 0.14 2 0.24 4 0.11 Black crappie 0 0.00 0 0.00 0 0.00 I 0.07 0 0.00 I 0.03 Tcssellaled darter 1 0.28 0 0.00 0 0.00 0 0.00 0 0.00 I 0.03 Logpcrch I 0.28 I 0.23 2 0.37 I 0.07 0 0.00 s 0.14 Walleye 0 0.00 0 0.00 0 0.00 0 0.00 12 1.46 12 0.34 Striped bass hybrid* 0 0.00 0 0.00 0 0.00 I 0.07 0 0.00 0.03 Ovtrall 357 100.00 427 100.00 535 /00.00 /,381 100.00 820 100.00 3,520 100.00 Number o[ se_ecles 17 13 18 21 19 26
- Not counlf:d as separale species.
/999PBAPS.fnlrpllf'bt J.J0.1/,Jj,J9JJ
- 111/IOO Nonnand*au Auoclates, ltte.
TablcJ-11 Monthly catch per effort (number per 30 min) for fishes collected by a DC electrofisher in Conowingo Pond, June-October 1999. June July August September October Mean Gizzard shad 7.25 46.00 43.25 26.25 30.25 30.60 Common carp 0.25 1.75 1.25 2.75 6.75 2.55 Golden shiner 0.00 0.25 3.00 0.25 0.00 0.70 Comely shiner 3.50 0.25 12.25 3.50 10.75 6.05 Spottail shiner 0.25 0.00 0.00 0.50 0.25 0.20 Spotfin shiner 12.50 5.75 4.25 6.75 4.75 6.80 Bluntnose minnow 0.00 0.00 0.25 0.00 0.00 0.05 Quillback 0.00 0.00 2.00 0.50 1.75 0.85 White sucker 0.00 0.00 0.00 0.00 3.50 0.70 Northern hogsucker 0.00 0.00 0.00 0.00 0.00 0.00 Shorthead redhorse 1.25 LOO 1.25 1.00 2.50 1.40 White catfish 0.00 0.00 0.00 0.25 0.00 0.05 Yellow bullhead 0.25 0.00 0.50 0.00 1.00 0.35 Brown bullhead 0.00 0.00 0.00 0.25 0.00 0.05 Channel catfish 6.75 4.25 6.50 4.50 5.15 5.55 Rock bass 0.75 2.00 1.50 4.50 4.00 2.55 Redbreast sunfish 2.75 0.00 0.25 0.50 0.25 0.75 Green sunfish 11.25 11.50 7.75 35.00 25.00 18.10 Pumpkinseed 0.25 0.00 1.25 9.50 1.75 2.55 Bluegill 12.00 9.00 29.25 138.75 57.75 49.35 Smallrnouth bass 29.50 21.00 16.25 65.25 25.00 31.40 Largemouth bass 0.25 3.75 2.50 44.00 20.50 14.20 White crappie 0.00 0.00 0.00 0.50 0.50 0.20 Black crappie 0.00 0.00 0.00 0.25 0.00 0.05 Tessellated darter 0.25 0.00 0.00 0.00 0.00 0.05 Logperch 0.25 0.25 0.50 0.25 0.00 0.25 Walleye 0.00 0.00 0.00 0.00 3.00 0.60 Striped bass hybrid* 0.00 0.00 0.00 0.25 0.00 0.05 Overall 89.25 106.75 133.75 345.25 205.00 176.00 Number of species 17 13 18 21 19 26
- Not counted as separate species.
1999PBAPSfnlrpr!Tbs 3-11.15,22.16.30,34 - 2121100 Normandeau Associat*s. Inc.
TableJ-12 Catch per effort (number 1>er 30 min) for fi~hes collected by a DC electrofisher at stations in Canowingo Pond, June-October 19!>9. Station 161** 164 165 190** Mean Gizzard shad 16.60 68.80 11.60 25.40 30.60 Common carp 5.80 l.40 0.80 2.20 2.55 Golden shiner 0.00 0.00 0.20 2.60 0.70 Comely shiner 1.20 6.60 5.60 10.80 6.05 Spottail shiner 0.20 0.20 0.20 0.20 0.20 Spotfin shiner 2.20 7.80 11.20 6.00 6.80 Bluntnose minnow 0.00 0.00 0.20 0.00 0.05 Quillback 2.00 0.00 0.40 1.00 0.85 White sucker 2.00 0.20 0.60 0.00 0.70 Shorthead redhorse 2.60 1.60 0.40 1.00 1.40 White catfish 0.00 0.20 0.00 0.00 0.05 Y cllow bullhead 0.40 0.80 0.20 0.00 0.35 Brown bullhead 0.20 0.00 0.00 0.00 0.05 Channel catfish 11.20 2.40 4.00 4.60 5.55 Rock bass 0.60 3.20 6.40 0.00 2.55 Redbreast sunfish 0.20 1.20 0.20 1.40 0.75 Green sunfish 9.80 14.20 26.60 21.80 18.10 Pumpkinseed 0.20 4.40 5.40 0.20 2.55 Bluegill 39.80 44.00 57.00 56.60 49.35 Smallmouth bass 47.00 28.60 33.60 16.40 31.40 Largemouth bass 36.00 8.80 7.60 4.40 14.20 White crappie 0.00 0.20 0.60 0.00 0.20 Black crappie 0.00 0.00 0.20 0.00 0.05 Tessellated darter 0.00 0.00 0.00 0.20 0.05 Logperch 0.00 0.20 0.80 0.00 0.25 Walleye 1.60 0.00 0.00 0.80 0.60 Striped bass hybrid* 0.20 0.00 0.00 0.00 0.05 Overall 179.80 194.80 173.80 155.60 176.00 Number o[ se.ec1es 19 19 22 17 26
- Not counted as separate species.
- Located within the influence of PBAPS thermal effluent.
1999PBAPSfnlrpr!Tbs 3-12.:!3 - 2121100 Normand1JOU Associates, Inc.
Table3-13 Compuison of the monthly catch per ell'ort (number per 30 minutes) for the common and Environmental Protection Agency designated, representative, important species collected at electrofishing stations In Conowingo Pund in Jwte-Odober. "-"-designates a period when no effort wu expended. Underlined CPEs are greater th1U1 histurical valuu 1md italidifll are I~ than historical..-alucs. June JuJv Au~t Seetcmber October N* Ranse N* Ran&c N* !Un Ee N* R.anEc N* Ran~~ White crappu Pre-operational Post-operational 3 0.00-1.18 3 0.92-1.50 4 l.00-3.07 2 3.0-3.58 8 1.25-33.00 1997 0.25 0.25 0.25 J.25 0.75 1998 0.25 0.00 0.00 0.25 0.00 1999 0.00 0.00 0.00 0.50 0.50 Channel caJfish Pre-operational Post-operational 3 6.86-50.95 3 9.30-25.05 4 14.67-56.00 2 16.S4-23.17 8 6.25-12.25 1997 6.00 10.75 56.25 ~ 12.75 1998 5.50 13.75 19.50 ll.ll 23.25 1999 6.75 4.25 6.50 4.50 5.75 Bluegill Prc-opcrational Post-operational 3 6.33-11.09 3 7.50-10.38 4 15.8042.00 2 20.00-33.09 8 22.62-136.25 1997 4.50 6.05 20.75 lli!!2 JJ.25 1998 6.00 10.00 22.00 ~ 25.75 1999 12.00 9.00 29.25 ill.Il 57.75 Giwuvl shad Pre-operational Post~tiooal 3 0.3U.42 3 0.00-129.60 4 8.0-111.l 7 2 2.06-29.08 8 1.00-101.37 1997 I.SO 46.50 I I.SO ~ 34.50 1998 2.50 9.25 11.00 10.25 17.75 1999 ill 46.00 43.25 26.25 30.25 Smallmouih bass Pre-operational Post-operational 3 9.80-15.67 3 13.0-15.17 4 12.67-20.58 2 18.43-19.67 8 12.88-64.75 1997 13.7' 17.00 ~ lQ.JQ 14.25 1998 lL.ll lill ~ ll.ll 25.50 1999 1UQ lli!Q 16.25 ~ 25.00 l.argDnDUlh boss Pro-operational Post-operational 3 0.43-2.42 3 0.30-1.67 4 0.60-3.83 2 3.69-9.17 8 1.04-98.75 1997 I.SO 3.50 7.25 J.50 21.25 1998 m 1.50 2.25 1.00 13.50 1999 0.2.5 m 2.50 ~ 20.50 Walkye Pre-operational Post-operational 3 0.00-0.25 3 0.00-1.20 4 0.08-0.33 2 0.00-2.83 8 0.00-7.12 1997 0.00 0.00 0.00 0.00 0.75 1998 0.00 0.00 0.00 0.00 1.00 1999 0.00 0.00 0.00 0.00 3.00
- N= the number of years in the historical period (pre-or post-operational) that sampling occurred in a given month.
1999/'BAPS.fabp//Tb 3-lJ -2121100
T1ble J-14 Number and percent composlllon ornshe.t collected by 10 J 4 n seine per month lo Conowlogo Pond, June-October 1999. .June Julr Au11ust Seetember O<lohcr o~*crall Number Percent Number Percent Number Percent Number Percent Number Percent Number Percent OiZZMd shnd 0 0.00 0 0.00 79 9.69 43 2.SS I 0.09 123 1.83 Cenlr.tl sloneroller 2 0.12 0 0.00 0 0.00 0 0.00 0 0.00 2 0.03 Rosystde clnce 8 0.49 6 0.40 13 1.60 32 1.90 8 0.74 67 1.00 Common carp 0 0.00 0 0.00 0 0.00 0 0.00 I 0.09 I 001 Cullips minnow I 0.06 4 0.27 1 0.12 0 0.00 1 0.09 7 0 I() Comely shiner I 0.06 12 0.81 14 1.72 0 0.00 0 0.00 27 040 Common shiner 21 1.28 14 0.94 10 1.23 7 0.42 3 0.28 SS 0 82 Spottail shiner I 0.06 35 2.36 0 0.00 2 0.12 17 1.57 SS 0 82 Swallowtnil shiner 2 0.12 3 0.20 2 0.25 0 0.00 0 0.00 7 0 IU Rosyfoce shiner 0 0.00 4 0.27 I 0.12 I 0.06 0 0.00 6 0.09 Spotfin sinner 597 36.31 770 51.89 541 66 38 1,400 83.04 863 79.54 4,171 62 12 Bluntnnse minnow 254 15.45 401 27.02 40 4.91 35 2.08 82 7.56 812 12 09 Blocknase dace 9 0.55 0 0.00 3 0.37 8 0.47 3 0.28 23 0.34 1..ongnosc dace I 0.06 s 0.34 I 0.12 1 0.06 I 0.09 9 0.13 Creek chub IS 0.91 16 1.08 6 0.74 ID 0.59 D 0.00 47 0.70 Fall Ii sh 3 0.18 0 0.00 0 0.00 0 0.00 0 0.00 3 004 Silvcrjnw minnow 0 0.00 0 0.00 2 0.25 0 0.00 0 0.00 2 0.03 Mimic shiner s 0.30 44 2.96 I 0.12 3 0.18 33 3.04 86 1.28 Quill back 54 3.28 8 0.S4 0 0.00 0 0.00 0 0.00 62 0.92 While sucker 73 4.44 42 2.83 ti I.JS 2 0.12 0 0.00 128 1.91 Northern hogsucker 0 0.00 0 0.00 0 0.00 0 0.00 4 0.37 4 0.06 Banded killilish I 0.06 I 0.07 0 000 0 0.00 1 0.09 3 004 Green sunfish 0 0.00 0 0.00 1 0.12 4 0.24 0 0.00 5 0.07 Pumpkinsced II 0.67 13 0.88 14 1.72 30 1.78 19 1.75 87 1.30 Bluegill 34 2.07 10 0.67 4 0.49 69 4.09 27 2.49 144 2.14 Smallmouth bass 2S l.S2 9 0.61 16 1.96 JS 0.89 8 0.74 73 l.09 Largemouth bass 85 S.17 9 0.61 24 2.94 12 0.71 7 0.65 137 2 04 Lcponus sp* ti 0.67 0 0.00 0 0.00 0 0.00 0 0.00 II 0.16 Tessellated darter 415 2S.24 62 4.1& 16 1.96 6 0.36 3 0.28 501 7.43 Logperch 13 0.79 15 1.01 14 1.72 6 0.36 2 0.18 50 0.74 Shield darter I 0.06 0 0.00 0 0.00 0 0.00 0 0.00 I 0.01 Greenside dnrtcr I 0.06 I O.D7 I 0.12 0 0.00 I 0.09 006 0-Ull 1.644 100.00 1,484 100.00 815 100.00 1.686 100.00 1,08$ 100.00 6,714 100.00 Numbtr o,!: se:,cirs ]j 21 1J 19 20 JI
- Not counted as separate species.
/999PBAPS.fnlrpl/TIJ J.U - 2121/00 Nomrontlcou Auoclar*1. lt1e.
Table 3-15 Monthly catch per effort (number per collection) for fishes collected by a 10 x 4 ft ~ine in Conowingo Pond, June-October 1999. June July August September October Mean Gizzard shad 0.00 0.00 11.29 6.14 0.14 3.51 Central stonerollcr 0.29 0.00 0.00 0.00 0.00 0.06 Rosyside dace 1.14 0.86 J.86 4.57 1.14 1.91 Common carp 0.00 0.00 0.00 0.00 0.14 0.03 Cutlips minnow 0.14 0.57 0.14 0.00 0.14 0.20 Comely shiner 0.14 1.71 2.00 0.00 0.00 0.77 Common shiner 3.00 2.00 1.43 1.00 0.43 1.57 SpottaH shiner 0.14 5.00 0.00 0.29 2.43 1.57 Swallowtail shiner 0.29 0.43 0.29 0.00 0.00 0.20 Rosyface shiner 0.00 0.57 0.14 0.14 0.00 0.17 Spotfin shiner 85.29 110.00 77.29 200.00 123.29 119.17 Bluntnose mimlow 36.29 57.29 5.71 5.00 11.71 23.20 Blaclcnosc dace l.29 0.00 0.43 1.14 0.43 0.66 Longnose dace 0.14 0.71 0.14 0.14 0.14 0.26 Creek chub 2.14 2.29 0.86 l.43 0.00 1.34 Fallfish 0.43 0.00 0.00 0.00 0.00 0.09 Silverjaw minnow 0.00 0.00 0.29 0.00 0.00 0.06 Mimic shiner 0.71 6.29 0.14 0.43 4.71 2.46 Quill back 7.71 1.14 0.00 0.00 0.00 1.77 White sucker 10.43 6.00 l.57 0.29 0.00 3.66 Northern hogsuckcr 0.00 0.00 0.00 0.00 0.57 0.11 Banded killifish 0.14 0.14 0.00 0.00 0.14 0.09 Green sunfish 0.00 0.00 0.14 0.57 0.00 0.14 Pumpkinseed 1.57 1.86 2.00 4.29 2.71 2.49 Bluegill 4.86 1.43 0.57 9.86 3.86 4.11 Smallmouth bass 3.57 1.29 2.29 2.14 1.14 2.09 Largemouth bass 12.14 1.29 3.43 1.71 1.00 3.91 Lepomis sp* l.57 0.00 0.00 0.00 0.00 0.31 Tessellated darter 59.29 8.86 2.29 0.86 0.43 14.34 Logperch 1.86 2.14 2.00 0.86 0.29 1.43 Shield darter 0.14 0.00 0.00 0.00 0.00 0.03 Grecnside darter 0.14 0.14 0.14 0.00 0.14 0.11 Overall 234.85 212.01 JJ6.44 240.86 154.98 191.82 Number of species 25 22 23 19 20 31
- Not counted as separate species.
1999PBAPS.falrprifbs J-J J.J 5,22,26,J0,34 - 2121100 Normandeau Astoctat1ts, Inc.
Table 3-16 Catch per effort (number 1>er collection) for fishes collected by a 10 t 4 ft seine at stations in Conowingo Pond, Juoe-October 1999. Station 202 203 208 209 210 212 214* Mean Gizzard shad 0.80 0.00 0.00 0.00 0.00 23.60 0.20 3.51 Central stoneroller 0.00 0.00 0.00 0.00 0.00 0.40 0.00 0.06 Rosyside dace 0.00 0.00 0.00 0.00 0.00 13.40 0.00 1.91 Common carp 0.00 0.00 0.00 0.00 0.00 0.00 0.20 0.03 Cutlips minnow 0.00 0.00 0.00 0.00 0.00 l.40 0.00 0.20 Comely shiner 2.80 0.00 l.40 0.00 0.00 1.20 0.00 0.77 Common shiner 0.00 0.00 0.00 0.00 0.00 10.80 0.20 l.57 Spottail shiner 2.00 3.00 0.00 0.00 0.00 5.80 0.20 l.57 Swallowtail shiner 0.00 0.00 0.00 0.00 0.00 1.40 0.00 0.20 Rosyface shiner 0.00 0.00 0.00 0.00 0.00 1.20 0.00 0.17 Spotfin shiner 170.40 115.20 64.40 48.80 184.80 209.60 41.00 119.17 Blumnosc minnow 33.20 9.00 23.00 14.60 2.00 71.00 9.60 23.20 Blacknose dace 0.00 0.00 0.00 0.00 0.00 4.60 0.00 0.66 Longnose dace 0.00 0.00 0.00 0.00 0.00 1.80 0.00 0.26 Creek chub 0.00 0.00 0.00 0.20 0.00 9.20 0.00 1.34 Fallfish 0.00 0.00 0.00 0.00 0.00 0.60 0.00 0.09 Silverjaw minnow 0.00 0.00 0.00 0.00 0.00 0.40 0.00 0.06 Mimic shiner 7.60 8.20 0.20 0.00 0.00 1.20 0.00 2.46 Quill back 0.00 12.40 0.00 0.00 0.00 0.00 0.00 l.77 White sucker 0.00 0.00 0.00 0.00 0.00 25.60 0.00 3.66 Northern hogsucker 0.00 0.00 0.00 0.00 0.00 0.00 0.80 0.11 Banded killifish 0.00 0.00 0.20 0.00 0.00 0.00 0.40 0.09 Green sunfish 0.00 0.00 0.00 0.00 0.20 0.80 0.00 0.14 Pumpkinseed 0.00 0.20 0.40 5.80 3.20 6.60 1.20 2.49 Bluegill 0.00 0.60 0.00 4.60 2.20 10.80 10.60 4.11 Smallmouth bass 2.40 3.20 4.00 0.00 1.60 2.60 0.80 2.09 Largemouth bass 1.60 0.00 0.60 20.20 1.20 3.60 0.20 3.91 Lepomis sp** 0.00 0.40 1.20 0.20 0.40 0.00 0.00 0.31 Tessellated darter 27.40 8.20 5.80 4.80 0.20 54.00 0.00 14.34 Logperch 0.00 2.80 0.00 0.20 0.40 6.60 0.00 1.43 Shield darter 0.20 0.00 0.00 0.00 0.00 0.00 0.00 0.03 Greenside darter 0.00 0.60 0.00 0.00 0.20 0.00 0.00 0.11 Overall 248.40 163.80 101.20 99.40 196.40 468.20 65.40 191.82 Number of S£!.ecies JO JI 9 8 JO 25 )) 31 Located within the influence of PBAPS thermal effluent.
- Not counted as separate species.
1999PBAPS.fnlrpt!Tbs 3-16.27.31 *212/100 Normand~au Associat.s, Inc.
Table 3-17 Diversity and evenness values for fishes taken by seine per month in Conowingo Pond, June-October 1999. Month Diversity Evenness June 0.819 0.519 July 0.677 0.505 August 0.631 0.464 September 0.370 0.290 October 0.407 0.312 Table 3-18 Index of percent similarity of species composition between seine stations during zero tower operation in Conowingo Pond, June-October 1999. Station Station 202 203 208 209 210 212 214 202 100.00 83.93 85.62 67.93 71.14 72.00 77.94 203 100.00 76.66 60.31 73.26 59.22 70.20 208 100.00 69.80 66.76 67.66 79.49 209 100.00 53.98 69.17 70.54 210 100.00 49.89 67.58 212 100.00 64.94 214 100.00 Table 3-19 Index of percent similarlity of species composition per month in Conowingo Pond, June-October 1999. June July August September October June 100.00 65.71 54.26 45.83 SO.IO July 100.00 67.35 59.38 68.20 August 100.00 78.98 77.12 September 100.00 89.44 October 100.00 1999PB.APS.fnlrpt\\Tbs J-17,18.19. 2121100 Normandeau A.ssociat*s, inc.
Tablel-20 Comparison or the monthly catch per efTort (number per collection) for the common and Environmental ProtKtlon Aatncy designated, represenbllve, lmron.tnt s~IH collrclod at seine 1Laliot11 in Conowingo Pond in June-Octobtt. "." -dtslgnates a ~,;od when no efTort 'WU erpended. Underilnfd CPEI are 1reater than historical values and 11.aldzfd are leu than lllstorical values. June Julv August Se[!temlHr OctatJ.r N* Rans* N* Rans* N* Rana* N' Rans* N* Range IYlrit< ~oppU Pre-operational 7 0-4.70 0-14.00 8 0-7.60 8 0-1.40 I 0-2.11 Post-opcratio.w 7 o.o.os 1 0-0.0S 7 0 7 0.1. 79 a 0-1.21 1997 0.00 0.00 0.00 0.00 0.00 1998 0.00 0.00 0.00 0.00 0.00 1999 0.00 0.00 0.00 0.00 0.00 Chonntl UlljWI Pre-cperatlonal 0-1.60 8 0-0.31 8 0-0.60 g 0-0.90 8 0-0.18 Post-opcralio.W 1 0-0.08 7 0 7 0-0.07 7 O.O.S7 8 0-0.43 1997 0.00 0.00 0.00 0.00 0.00 1998 0.00 0.29 0.14 0.00 0.2!1 1999 0.00 0.00 0.00 0.00 0.00 Blueiill Pre-operational 7 0-2.06 B 0.4Hi2.46 8 0.62-103.0S B 0.4S-62.IO 0.75-S0.71 Post-operational 7 0-2.00 7 0.36-S.71 7 0.21-3.21 7 0.14-21.31 I 0.07-39.36 1997 0.00 1.00 1.43 0.71 4.71 1991 Ul. 6.00 7.00 16.14 1271 15199 !M 1.43 O.S1 9.16 3.16 SIHllllnwulli It.- ~onal 6 0-7.62 8 0-2.10 I 0-0.46 8 o.-0.19 a o.-0.33 Post-Gpenlional 1 0-0.90 7 0.07-3.41 7 O-l.S2 7 0-3.!IO a 0-2.00 1997 1.14 1.14 O.S1 0.43 0.00 19!18 3.86 2.S7 0.43 0.14 0.16 1999 l.S7 1.29 2..22 2.14 1.14 Ulrtent1Jllik bas Pre-operational 7 0-3.06 g 0.14-6.82 8 0-1.20 8 o.-0.67 8 IJ.-0.28 Post-operational 7 0.08-3.00 7 1.00-14.00 7 0.07*1.38 7 0-2.S2 8 0.14-1.79 1997 ~ 3.14 1.00 0.71 0.00 19!18 2.43 0.29 0.00 0.29 0.16 1999 Uli 1.29 Ml 1.71 1.00 Spatfin *hinlll' ~ 7 l l.S0-15.43 I 2.11-79.92 I 19.17*100.9S 8 26.Sl-124.10 a 27.42-134.74 Post-opcnlional 7 27.62* 79.92 7 9.64-60.21 7 17.Sl*IOS.71 7 20.91-21).29 I 22.31-284.43 1997 42.14 1llL1l 96.29 70.71 17.14 19!18 28.86 44.14 lli.li 176.16 26U7 1999 U.29 ll!IJ!!! 77.29 200.00 123.29 Bhuttao** INinn6w Pre-opcr.itiona 7 0.35-1.30 I 0-S.1!5 ll 0.08-47.00 8 0.20-11.-40 I 0.43-6.SS Post-opcr.1lion.al 7 0.3o-6.33 7 0.86-7.43 7 0.23-8.79 7 0.09-20.41 I 0.71.Q.SO 1997 0.71 6.86 !1..22 15.71 Sl.29 1991 UM 1.43 liJIQ lU§ 31.S7 1999 lU2 ll.22 S.71 S.00 11.71 Pun.,liituutl Pre-opcnlion.al 7 0-1.71 O.Sl-6.01 0.21-17.7S I 0.14-37.60 0-9.71 Post-opcntional 7 0-1.62 7 0.22-4.00 7 1.20-4.00 7 0.57-10.90 I 0-5.'7 19!17 0.71 1.43 1.86 1.14 l.S7 1998 lM 1.29 4.00 6.S7 3.S7 1999 1.S7 1.16 2.00 4.29
- 2. 71 Spotulil *ltU.u Pre-operational 7
0.04-2.'7 I O-S.39 8 0-6.6S 8 0-5.19 I 0-20.42 Posc-opcnlional 7 0.31-7.2S 7 0.11*12.13 7 0-3.S6 7 0-1.33 I 0-4.17 1991 2.11 ~ S.71 3.57 L.S7 1998 74.-4~ O.S7 ll.J.! 5.86 2.43 1999 0.14 S.00 0.00 029 2.43 Tasdoud il1mu Pre-openirional 7 0-100 0-7.45 I 0-1.83 I 0-2.SO I 0-2.43 Post*opcnlional 7 0.29-5.54 7 0.63* 21.SO 7 O.SO*S.17 7 0.14-1.71 8 0.17-7.36 19!17 ~ .a.!!.Q S.29 2.00 1.29 19!18 7.71 10.14 4.71 3.71 1.43 1999 ~ 8.86 2.29 0.86 0.43
- N* lhc number of years U1 lhc his1orica.J penod (pre* or pos1-opcn11onal) that umpling occurred in a~
month. 1999PIJAPS/nlrp1l11'1J-10.18.11.JI*1flll00 -A.rnK-4'1t<.
Table 3-21 Number and percent composition of fishes collected by trap net per month In Conowingo Pond, June-October 1999. June Juli Au~st September October Overall Number Percent Number Percent Number Percent Number Percent Number Percent Number Percent Gizzard shad 0 0.00 92 47.92 6 8 4S I 0.39 0 0.00 99 1509 Common carp 4 10.53 4 2.08 3 4.23 22 8.66 14 13.86 47 7.16 Golden shiner 0 0.00 0 0.00 0 0.00 1 0.39 0 0.00 I O.IS SpotJin shiner 0 0.00 I 0.S2 0 0.00 0 0.00 0 0.00 I 0.15 Quillback 0 0.00 0 0.00 0 0.00 3 1.18 0 0.00 3 0.46 Shorthc.1d redhorse 2 5.26 3 1.56 0 0.00 1 0.39 3 2.97 9 1.37 White catfish 2 5.26 0 0.00 0 0.00 0 0.00 0 0.00 2 0.30 Yellow bullhc.1d I 2.63 1 0.52 0 0.00 3 1.18 0 0.00 s 0.76 Brown bullhead 0 0.00 1 0.52 2 2.82 13 5.12 1 0.99 17 2.59 Channel catfish 1 18.42 17 8.85 24 33.80 54 21.26 9 8.91 Ill 16.92 White perch 0 0.00 0 0.00 I 1.41 7 2.76 0 0.00 8 1.22 Rock bass 0 0.00 0 0.00 2 2.82 s 1.97 17 16.83 24 3.66 Redbreast sunfish 0 0.00 0 0.00 0 0.00 0 0.00 1 0.99 I O.IS Green sunfish I 2.63 25 IJ.02 I 1.41 4 l.S7 0 0.00 31 4.73 Pumpkinseed 4 10.53 s 2.60 4 S.63 l 0.39 2 1.98 16 2.44 Bluegill 13 34.21 27 14.06 14 19.72 36 14.17 IS 14.85 105 16.01 Smallmouth bass 0 0.00 0 0.00 0 0.00 1 0.39 0 0.00 I O.lS Largemouth bass I 2.63 3 1.56 1 1.41 15 5.91 2 1.98 22 J.35 White crappie 3 7.89 13 6.77 13 18.31 85 33.46 34 33.66 148 22.56 Black crappie 0 0.00 0 0.00 0 0.00 0 0.00 I 0.99 I O.IS Walleye 0 0.00 0 0.00 0 0.00 2 0.79 2 1.98 4 0.61 Overall 38 100.00 192 100.00 71 100.00 254 100.00 IOI 100.00 656 100.00 Number o[se.ecies 10 JZ JI 17 fl 21 1999PBAPS.fnl"Pt/T!JI J-10.21.lJ.19,JJ
- 111//00 Normortd1nw.<sr<<latu. Inc.
TableJ-22 Monthly catch per effort (number 1>er 24 h) for fishes collected by trap net at stations in Conowingo Pond, June-October 1999. June July August September October Mean Gizzard shad 0.00 11.32 0.76 0.13 0.00 2.44 Common carp 0.48 0.45 0.37 2.78 1.69 1.15 Golden shiner 0.00 0.00 0.00 0.13 0.00 0.03 Spotfin shiner 0.00 0.13 0.00 0.00 0.00 0.03 Quill back 0.00 0.00 0.00 0.37 0.00 0.07 Shortliead redhorse 0.24 0.37 0.00 0.12 0.36 0.22 White catfish 0.25 0.00 0.00 0.00 0.00 0.05 Yellow bullhead 0.13 0.13 0.00 0.38 0.00 0.13 Brown bullhead 0.00 0.13 0.25 1.61 0.12 0.42 Channel catfish 0.89 2.07 3.01 6.79 1.11 2.77 White perch 0.00 0.00 0.12 0.90 0.00 0.20 Rocle bass 0.00 0.00 0.25 0.64 2.15 0.61 Redbreast sunfish 0.00 0.00 0.00 0.00 0.13 0.03 Green sunfish 0.12 3.10 0.12 0.50 0.00 0.77 Pumpkinseed 0.51 0.58 0.49 0.12 0.25 0.39 Bluegill l.57 3.14 1.77 4.50 1.86 2.57 Smallmouth bass 0.00 0.00 0.00 0.13 0.00 0.03 Largemouth bass 0.14 0.37 0.13 1.93 0.25 0.56 White crappie 0.37 1.59 1.62 10.53 4.14 3.65 Black crappie 0.00 0.00 0.00 0.00 0.11 0.02 Walleye 0.00 0.00 0.00 0.25 0.24 0.10 Overall 4.70 23.38 8.89 31.81 12.41 16.24 Number of species JO 12 11 17 12 21 /999PBAPS.[n/rpt/I'bs J-11.15.22.26,J0.34
- 2121100 Normandeau Associates, Inc.
Tablel-23 Catch per effort (number per 24 h) for fishes collected by trap net at stations in Coaowingo Pond, June-October 1999. Station 104 107 108 110* Mean Gizzard shad 0.10 0.10 0.20 9.36 2.44 Common carp 0.10 0.49 0.61 3.42 1.15 Golden shiner 0.00 0.00 0.00 0.10 0.03 Spotfin shiner 0.00 0.00 0.00 0.10 0.03 Quill back 0.00 0.29 0.00 0.00 0.07 Shorthead redborse 0.00 0.48 0.20 0.19 0.22 White catfish 0.20 0.00 0.00 0.00 0.05 Yellow bullhead 0.00 0.00 0.30 0.21 0.13 Brown bullhead 0.20 0.19 1.30 0.00 0.42 Channel catfish 0.67 0.57 0.80 9.07 2.77 White perch 0.00 0.09 0.00 0.72 0.20 Rock bass 2.02 0.00 0.00 0.41 0.61 Redbreast sunfish 0.10 0.00 0.00 0.00 0.03 Green sunfish 0.30 0.39 0.30 2.08 0.77 Pumpkinseed 0.68 0.20 0.19 0.49 0.39 Bluegill 2.63 1.63 2.17 3.83 2.57 Smallmouth bass 0.00 0.00 0.00 0.10 0.03 Largemouth bass 0.31 0.19 0.31 1.44 0.56 White crappie 3.12 3.93 6.31 1.23 3.65 Black crappie 0.00 0.00 0.00 0.09 0.02 Walleye 0.10 0.00 0.00 0.29 0.10 Overall 10.53 8.55 12.69 33.13 16.24 Number of. se.ecies 13 12 /1 17 21
- Located within influence of PBAPS thennal emuenL J999PBAPS.fn/rpr/Ibs 3-12.13-2121100 Normandea11 A1;rociate1, /nc.
TableJ-24 Comparison of the moathly catch per efl'ort (number per 14 h) for the common and Enviro1U11ental Protedlon Acemcy deslp.ated. repaacntallve. lmpurtant speda coll<<fed at trap nel stations in Conc.win10 Pond In June-Octobu. "*"-deslpaata a period when no e11'ort 'Wfdl urienc!ed.. l lnderlined CPEs are :realer than hiseorical values Mil ltaUclzed are leu than hiaforical values. June Julv August Se!!Umber October N* Range N* Range N* Range N* R1111ge N* Range White cn1ppie Pre-operational 7 29.82-144.41 7 17.08-87.09 7 9.41-7S.ll 7 10.67-63.54 8 7.24-114.21 Post-operational IS 0.52-34.74 7 1.01-17.46 7 1.11-23.31 7 S.35-34.81 16 1.13-27.19 1997 0.65 1.38 J.37 1.70 3.64 1998 1.96 l 00 1.61 0.86 2.65 1999 0.37 U9 1.62 10.53 4.14 Channel catfish Pre-operational 7 2.37-12.66 7 1.67-65.55 7 1.53-13.38 7 1.37-14.71 8 0.92-19.93 Post-operational IS 0.00-135.67 7 2.61-21.71 7 4.70-21.77 7 2.60-16.24 16 0.11-62.98 1997 3.36 0.75 1.87 0.75 0.75 1998 0.78 0.25 J..19 1.08 1.62 1999 0.89 2.07 3.01 6.79 1.11 BluqiU Pre-operational 7 0.55-8.16 7 2 49-10.54 7 1.10-9.98 7 2.7S-5.7l 8 0.50-7.80 Post-operational IS 0-6.00 7 1.02-3.36 7 1.34-11.65 7 Ul-7.00 16 0.31-13.06 1997 3.47 0.92 2.83 l.60 2.24 1998 0.52 4.76 4.56 5.99 2.24 1999 1.57 3.14 1.77 <4.50 1.86 Gi:;:ortl ll111tl Pre-operational 1 0.08 2 0.06-0.14 2 0 2 0.04--0.13 2 0.02-0.04 Post-operational 15 0-0.52 7 0-1.68 7 0.06-0..57 7 0-0.64 16 0-102.66 1997 0.00 0.00 0.12 0.00 0.15 1998 0.00 0.00 0.00 0.13 0.2S 1999 0.00 11.32 0.76 0.13 0.00 SmallMauth ban Pre-operational 4 0-0.06 4 0-0.02 4 0 4 0-0.0l Post-operalional 15 0 7 0-0.18 7 0-0.07 7 0 16 0 1997 0.00 0.00 0.00 0.00 0.00 1998 0.00 0.00 0.00 0.00 0.00 1999 0.00 0.00 0.00 0.13 0.00 Largemout/1 ban Pre-operational 4 0-0.0S 6 0-0.0S 6 0-0.lS 6 0-0.08 7 0-0.12 Post-opc:rational 15 0-0.29 7 0-0.30 7 0-0.12 7 0-0.ll 16 0-0.77 1997 0.25 0.12 0.12 0.00 0.00 1998 0.00 0.2S 0.00 0.00 0.00 1999 0.14 0.37 0.13 !.21 0.25 Walkye Pre-opcntional 6 0-0.29 6 0-0.18 6 0-0.04 6 0-0.04 7 0-0.08 Post-operational IS 0-0.52 7 0-0.07 7 0-0.0~ 7 0-0.24 16 0-0.39 1997 0.00 0.00 0.00 0.00 0.00 1998 0.00 0.00 0.00 0.00 0.13 1999 0.00 0.00 0.00 0.25 0.24 Bro*m lm/11.ead Pre-operalional 7 0.88-5.38 7 0.65-3.98 7 0.58-2.21 7 0.15*3.02 8 0.33-2.63 Post-operational 15 0-12.16 7 0.27-0.55 7 0.<46-1.78 7 0.34-2.00 16 0-4.99 1997 0.12 0.00 0.00 0.00 0.12 1998 0.40 0.12 0.00 0.00 0.13 1999 0.00 0.13 0.25 1.61 0.12 Piunpkuiseetl Pre-operational 7 0.53-7.31 7 1.40-11.32 7 0.86-3.12 7 1.26-6.46 8 1.23-10.34 Post-operational IS 0-9.29 7 0.30-4.53 7 0.41-2.70 7 0.38-4.00 16 0-41.2S 1997 0.89 0.12 0.74 0.J] 1.09 1998 0.26 O.JJ 0.26 0.74 0.50 1999 O.. H 0.58 0.419 0.11 0.2~
- N* the number af years in the his1orical period (pre* or posl-operational) thal sampling oc:currcd in a given monlh.
/'J99f'BAl'S.falrpt/1l J.U
- 2121100 N---**A.uocl*IU, IM
Tablel-25 Number and percent composition of fishes collected by a 16 ft semi-balloon trawl per month In trawl zone 405, Conowlngo Pond, June-October 1999. June Jul2'. Au&!!st Se~tembcr October O\\*erall Number Percent Number Percent Number Percent Number Percent Number Percent Number Percent Gizzard shad 3 0.77 0 0.00 0 0.00 8 6 72 0 000 II 1.48 Common carp 4 1.02 ] 2.78 2 .S.00 8 6 72 5 6 02 22 l 97 Spollail shiner 0 0.00 I 0.93 0 0.00 0 000 0 000 I 0 13 Bluntnose minnow 0 0.00 0.93 0 0.00 0 000 0 000 I
- 0. 13 Shortbead rcdhorse I
0.26 0.93 0 0.00 0 0.00 0 000 2 0.27 White cntlish I 0.21\\ 0.93 0 0.00 0 0.00 0 000 2 027 Yell ow bullhcnd 0 0.00 0 0.00 0 0.00 0,84 0 0.00 I 0.13 Brown bullhead I 0.26 I 0.93 0 0.00 0 84 0 0.00 J 0.40 Channel callish 325 83.12 36 33.33 34 85.00 92 77 JI 71 85 54 558 75.30 Rock bass I 0.26 0 0.00 0 0,00 2 1.68 0 000 3 040 Bluegill 0 0.00 6 S.56 0 0.00 I 0.84 3 3 61 10 1.35 Largemouth bnss 0 0.00 I 0.93 I 2.50 0 0.00 0 0.00 2 0.27 Tcssellalcd dancr 55 14.07 55 50.93 J 7.50 5 4 20 4 4 82 122 16.46 Yellow perch 0 0.00 I 0.93 0 0.00 0 000 0 000 I 0 13 Walleye 0 0.00 0.93 0 0.00 I 0 84 0 000 2 I) 27 o.. erall 391 100.00 108 100.00 40 100.00 119 100.00 83 100 00 74/ 100.00 Number o[.f£!!.cles 8 12 .t 9 ./ 15 1999PBAPS.firlrpt/T1J1 J./0,1/,1S,29,J1
- 2121/00 NonnonJ*au Auoc1a111. /ne.
Table 3-26 Monthly catch per effort (number per 10 min haul) for fishes collected by a 16 ft semi-balloon trawl in trawl zone 405, Conowingo Pond, June-October 1999. June July August September October Mean Gizzard shad 0.57 0.00 0.00 1.33 0.00 0.38 Common carp 0.67 0.50 0.33 1.40 0.83 0.75 Spottail shiner 0.00 0.21 0.00 0.00 0.00 0.04 Bluntnosc minnow 0.00 0.21 0.00 0.00 0.00 0.04 Shorthead redhorse 0.17 0.21 0.00 0.00 0.00 0.08 White catfish 0.17 0.21 0.00 0.00 0.00 0.08 Y cllow bullhead 0.00 0.00 0.00 0.24 0.00 0.05 Brown bullhead 0.17 0.21 0.00 0.17 0.00 0.11 Channel catfish 54.88 6.67 5.67 15.33 11.83 18.88 Rocle bass 0.17 0.00 0.00 0.33 0.00 0.10 Bluegill 0.00 1.17 0.00 0.24 0.50 0.38 Largemouth bass 0.00 0.21 0.24 0.00 0.00 0.09 Tessellated darter 10.45 10.04 0.50 0.83 0.67 4.50 Y cllow perch 0.00 0.17 0.00 0.00 0.00 0.03 Walleye 0.00 0.21 0.00 0.24 0.00 0.09 Overall 67.25 20.02 6.74 20.11 13.83 25.60 Number of species 8 12 4 9 4 15 1999PBAPS.fnlrpt!Tbs 3-JJ,JS.21.16.30.34 -1121100 Normandeau A11oc1ate1, /nc.
Table 3-27 Catch per effort (number per 10 min haul) for fishes collected by 16 ft semi-balloon trawl in trawl zone 405, Conowingo Pond, June-October 1999. Station 45P' 452 453 454 455 456 Meaa Gizzard shad 0.00 0.80 0.40 0.80 0.00 0.29 0.38 Common carp 0.29 0.00 1.00 2.00 0.80 0.40 0.75 Spottail shiner
- 0.00 0.00 0.00 0.00 0.25 0.00 0.04 Bluntnose minnow 0.00 0.00 0.25 0.00 0.00 0.00 0.04 Shon.head redhorse 0.00 0.00 0.25 0.00 0.20 0.00 0.08 White catfish 0.00 0.00 0.00 0.00 0.45 0.00 0.08 Yellow bullhead 0.29 0.00 0.00 0.00 0.00 0.00 0.05 Brown bullhead 0.00 0.20 0.00 0.20 0.25 0.00 0.11 Channel catfish 1.40 40.60 16.70 11.80 35.10 7.66 18.88 Rock bass 0.00 0.00 0.00 0.00 0.20 0.40 0.10 Bluegill 0.29 0.00 1.20 0.80 0.00 0.00 0.38 Largemouth bass 0.29 0.00 0.00 0.00 0.25 0.00 0.09 Tessellated darter 0.00 1.20 3.30 7.60 3.95 10.94 4.50 Yellow perch 0.00 0.00 0.00 0.20 0.00 0.00 0.03 Walleye 0.29 0.00 0.25 0.00 0.00 0.00 0.09 Ov~ral/
2.85 42.80 23.35 23.40 41.45 19.69 25.60 Number o[ Sf!!._cies 6 4 8 7 9 5 15
- Locates within influence of PBAPS thermal effluent.
J999PBAPS.[nlrpt/Ibs J-16,27,JJ. ]121100 Normandeau Assoc1atu. Jnc.
Table 3-18 Comparison orthe monthly catch per effort (number per JO min haul) ror the common and Enrironmmlal Protecdoa Acency designated, rcprr.sentaU", Important species c!Jllrcttd 3t tn1wl zonr 405 In ConoWingo Ponti In Jun..october. "-"~n!Snates 1 period when no effort - Hpended. Unclertlntd CP.Es arc grntn-than historical valuts and Uallciled are laa lhln hls1orical values. June Juli: August S.l!tember Octobu N* Rans~ N* Range N* Ranae N* Ranae N* Range W1til6erap,U Pn>-OpCnltional 7 O.o.MJ.00 I o.~.33 8 O.Sl-84.25 7 0.21-14S.18 7 0.31-411.40 Pos1-opcratiOIW 6 0.00-0.09 IS 0.00-0.70 15 O.OCM.23 IS 0.00-1.90 16 0.00-2.S!I 1997 0.17 0.33 0.00 0.00 0.00 1998 0.00 0.00 0.21 0.33 0.17 1999 0.00 0.00 0.00 0.00 0.00 Cllonnd Cillfisli Pre-opmnional 1 0.18-294.24 0.00-IS6.33 8 U0-131.67 7 2.00-278.81 7 6.S7-933.IO Post-opcntional 6 9.70-117.36 IS 1.25-18.83 IS
- o. 00-180.26 IS 0.14-220.15 16
- 2. 79-201.02 1997 2404 w.rz llU1 63.00 31.33 1998 130.96 92.00 161.25 112.lS 102.18 1999 54.88 6.61 S.67 15.33 11.83 BhupJ
.Prc-opcntioU 6 0.06-2.75 0.00-22.55 8 0.00-18.13 7 0.01-21.33 1 0.00-17.75 P0tt-opcntioml 6 0 15 O.oo.G.33 15 0.00-5.51 IS O.oo-6.lS 16 0.00.2.40 1997 0.00 13.00 1.90 2.00 I.SO 1998 0.17 0.00 0.17 0.00 0.61 1999 0.00 1.17 0.00 0.24 0.50 Giumtl dttld Prc-opcnilioual 2 0 2 0.00-0.04 2 0.00-0.SO 2 0 POll-openlional 6 0.00-0.14 15 0.00-IHI 15 0.00-4.13 IS 0.00-6.43 16 0.00-165.92 1997 0.00 3.17 0.24 0.00 0.40 1998 0.00 0.00 0.33 0.33 0.00 1999 Q.ll 0.00 0.00 1.33 o.oo Smtsllnul1'1lt /JOS6 .Prc-opcntional 2 0.13-0.33 3 0.00-0.SO 3 0.00-0.38 2 0.04-0.13 l 0 Post-opcr.uional 6 0.00-0.20 15 0.00-0.09 15 0.00-0.17 lS 0.00-0.lS 16 0.00-0.20 1997 0.00 0.00 0.00 0.00 0.00 1991 0.00 0.00 0.00 0.00 0.00 1999 0.00 0.00 0.00 0.00 o.oo Larpmollllr/Jen Prc-opcralional 0.()().-0.13 3 0.00-0.11 3 0.00-0.13 2 0.00-0.63 2 0.00-0.04 Post-operational 6 0 IS 0 IS 0.00-0.0S IS 0.00-0.17 16 0.00.0.17 1997 0.00 ill Q.ll 0.00 0.17 1998 0.00 0.00 0.00 0.00 0.00 1999 0.00 2.ll !ill 0.00 0.00 Walleye fro.opcralional 6 O.oo.-0.12 0.00-0.11 s 0.00-0.16 4 O.oo.-0.16 4 0.00-0.16 POll-opcmjoa.al 6 O.oo.-0.10 IS 0.00-0.2S JS 0.00-0.11 1S 0.00-0.29 16 0.00-0.12 1997 0.00 0.00 0.00 0.00 0.00 1998 0.00 0.00 l!..ll 0.00 0.00 1999 0.00 0.21 0.00 0.24 0.00 Pun.,.,.U.Sed .Prc-opcmjooal 6 0.24-2.33 0.00-7.92 I 0.00-9.94 7 0.04-14.33 7 0.14-6.95 Pott-opcr.atiorW 6 0.00-0.33 14 0.00-1.80 14 O.OO-l.7S 14 0.00-S.95 16 0.00-3.6S 1997 0.00 0.00 0.00 0.33 0.00 1998 0.00 0.00 0.00 0.00 0.00 1999 0.00 0.00 0.00 0.00 0.00 Tasdllld dartt:r Pre-openlional 7 0.00-l.lS a O.OO-H2 8 0.04-6.00 7 O.OO-S.S4 7 0.00-4.41 POll-openlional 6 0.67-4.00 14 0.67-30.60 14 0.2S-16.29 14 0.13-7.70 16 O.S0-15.17 1997 .l1,.,8j lll1 Z2.lJI lLJJ. 9.83 1998 ~ 10.33 8.68 2.ll 2.00 1999 ~ 10.04 o.so 0.13 0.61 SpOllaiJ shine' J'R-opcrarional 7 0.00-2.29 g 0.00-3.00 8 0.00-3.2S 7 0.00-S.33 7 0.00-19.00 Post-operarional 6 0.00-0.67 14 0.00-6.27 14 0.00-4.SO 14 0.00-2.57 16 0.00-3.13 1997 0.17 0.13 I.SO 0.00 0.00 19911 0.33 w l.Lll 1.04 0.00 1999 0.00 0.21 0.00 0.00 0.00
- N* the nwnbc:T ofyean in lhc his1oric.al pctiod (pre* or post-operational) thal umpling oc.:umd in a giva1 month.
,,,,,MJIS/*/rpr/11>> J-10.1B.J1.J~. ]/1/100 -Au<<...... /tc
Table 3-29 Number and percent composition or fishes collected by a 16 rt aemi-balloon trawl per month in trawl zone 408, Conowingo Pond, June-October 1999. June Jul;i:: Aue!!SI Se~tember Octohcr O\\*crnll Number Percent Number Percent Number Percent Number Percent Number Percent Number Percent Gizzurd shod 401 59 14 s 7.81 I 2.33 2 13.JJ 0 0.00 409 48,69 Common carp 2 0.29 3 4.69 0 0.00 I 6.67 I 2.SO 7 0.83 Sponail shiner 2 0.29 I 1.56 0 0.00 0 0.00 I 2.50 4 0.48 Bluntnose mtnnow 64 9.44 0 0.00 0 0.00 0 0.00 0 0.00 64 7.62 White catfish 0 0.00 0 0.00 0 0.00 0 0.00 I 2.50 I 0.12 Yellow bullhead 0 0.00 0 0.00 0 0.00 I 6.67 0 0.00 I 0.12 Brown bullhead 2 0.29 0 0.00 0 0.00 0 0.00 0 0.00 2 0.24 Channel callish 61 9.00 24 37.50 30 69.77 3 20.00 1 2.SO 119 14.17 Pumpkinsccd 3 0.44 5 7.81 s 11.63 3 20.00 7 17.50 23 2.74 Bluegill 25 3.69 10 15.63 2 4.6S s 33.33 17 42.50 59 7.02 Smallmoulh bass 9 1.33 I U6 2 4.65 0 0.00 0 0.00 12 1.43 Largemoulh b.iss 10 1.47 9 14.06 I 2.33 0 0.00 4 10.00 24 2.86 Tcsscllaled dancr 99 14.60 6 9.38 2 4.6S 0 0.00 7 17.SO 114 IJ.57 Yellow perch 0 0.00 0 0.00 0 0.00 0 0.00 1 2.50 1 0.12 Overall 678 100.00 64 100.00 43 100.00 15 100.00 40 100.00 840 100 00 Number of se.ec1e:s II 9 7 6 9 II /9991'8APS,fobpt/Tb11-/0,1/,1',29,JJ. 2121100 Normottdr.aw Auocfok1, /1te.
Table 3-30 Monthly catch per effort (number Iler 10 min haul) for fishes collected by a 16 ft semi-balloon trawl in trawl zone 408, Conowingo Pond, June-October 1999. June July August September October Mean Gizzard shad 67.40 0.88 0.17 0.33 0.00 13.76 Common carp 0.40 0.50 0.00 0.17 0.17 0.25 Spottail shiner 0.33 0.21 0.00 0.00 0.17 0.14 Bluntnose minnow 10.67 0.00 0.00 0.00 0.00 2.13 White catfish 0.00 0.00 0.00 0.00 0.17 0.03 Yellow bullhead 0.00 0.00 0.00 0.17 0.00 0.03 Brown bullhead 0.33 0.00 0.00 0.00 0.00 0.07 Channel catfish 10.24 4.00 5.00 0.50 0.17 3.98 Purnpkinseed 0.50 0.83 0.83 0.50 1.17 0.77 Bluegill 4.24 1.83 0.33 0.83 2.83 2.01 Smallmouth bass 1.50 0.17 0.33 0.00 0.00 0.40 Largemouth bass l.67 1.50 0.17 0.00 0.67 0.80 White crappie 0.00 0.00 0.00 0.00 0.00 0.00 Tessellated darter 17.00 1.00 0.33 0.00 1.17 3.90 Y cllow perch 0.00 0.00 0.00 0.00 0.17 0.03 Overall 114.28 10.92 7.16 2.50 6.69 28.30 Number of species 11 9
- 7 6
9 14 l999PBAPSfnlrpt/Tbs 3-11.1.5,22.26,30,34 -1121100 Nonnandeav Associatu. Inc.
Table J-31 Catch 1>cr effort (number per 10 min haul) for fi!lhes collected by 16 ft semi-ballnon trawl in trawl zone 408, Conowiogo Pond, June-October 1999. Station 481 482 483 484 485 486 Mean Giu.ardshad 0.25 13.20 0.40 19.40 47.00 2.29 13.76 Common carp 0.00 0.40 0.20 0.20 0.00 0.69 0.25 Spottail shiner 0.45 0.00 0.40 0.00 0.00 0.00 0.14 Bluntnose minnow 0.00 0.00 0.60 0.60 11.60 0.00 2.13 White catfish 0.00 0.20 0.00 0.00 0.00 0.00 0.03 Yellow bullhead 0.00 0.20 0.00 0.00 0.00 0.00 0.03 Brown bullhead 0.00 0.20 0.00 0.20 0.00 0.00 0.07 Channel catfish 3.60 12.40 5.00 1.80 0.20 0.89 3.98 Pwnpkinseed 0.20 2.20 l.80 0.20 0.20 0.00 0.77 Bluegill 1.20 4.40 2.00 2.20 1.80 0.49 2.01 Small.mouth bass 0.40 0.00 0.20 0.40 1.40 0.00 0.40 Largemouth bass 0.00 0.80 0.60 1.80 1.40 0.20 0.80 Tessellated darter 2.80 3.20 LOO 13.20 1.00 2.20 3.90 Yellow perch 0.00 0.20 0.00 0.00 0.00 0.00 0.03 Overall 8.90 37.40 12.20 40.00 64.60 6.76 28.30 Number ol Sf!!.Cies 7 11 JO JO 8 6 u J999PBAPSfnlrpltTbs J-16,27.Jl. 2121100 Nonnandctnl A11oc1ares, /nt:.
Table J.Jl Comparison at the monthly catch per effort (number per JO min hllul) for the common and En11iromnffttal Prottctlon Aceney desllnated, npresent.atlw, lmpor<.ant SjM!tW. collec:led at trawl zone 41!8 In Concnringo Pond In June-October. "*"-deslcnates a period when no effort was upended. Underlined CPEs are 11reater than historical ftlues and lt.allclud are leu thu hlstork:aJ \\lalues. June Jul\\' August Se(!temlM!r Octobtt N" Ran re N* Range N* R1111e N* Ra!!£* N* Ranse lf'#ikt:rappU Pre-operation.ti 7 2.96-59.39 S.92*569.18 8 l.13*216.36 6 2.00.343.00 7 0.00-9S.S4 Post-opc:n1ion.tl 7 0.22*10.97 IS O.U*9.4S IS 0.33-S0.71 lS 0.17*37.04 16 0.33*32. 76 1997 0.00 0.00 0.00 0.00 0.00 1998 0.33 3.83 0.00 0.00 0.33 1999 0.00 0.00 0.00 0.00 0.00 0.*1111d utfis/r Pre-operatiolUI 7 S.67*113.88 8 3.60-144.25 8 0.00-226.17 6 0.00-139.25 7 2.31-13.+4 Post-openOorial 7 3.22-26.17 15 0.67-SS.25 15 0.42-49.81 IS 1.4S-41.96 16 0.17*9S.S7 1997 6.83 10.00 63.33 21.17 6.00 1998 7.00 250 2.83 1.67 0 17 1999 10.24 4.00 S.00 o.so 0.17 Bbupl Pre-Gperaliooal 6 0.04*7.25 8 0.04-42.SO 8 0.83-243.41 6 0.00.22.16 7 0.29-22.S4 Post-opentiolUI 7 0.00-0.49 15 0.00.31.09 IS 1.25-32.00 lS 1.17*35.37 16 0.09*19.33 1997 0.67 all 4.67 3.SO 3.67 1998 3.83 li!Ul 7.17 3.33 5.83 1999 4.24 1.83 O.JJ 0.13 2.83 GU.utnl*""" ~liooal 2 0 2 0.33-12.46 2 0.Sl*l0.S8 2 0.03-0.0I Posr-opcruioml 7 0.00-32.33 15 O.lo-673.00 IS 0.14-22..17 lS o.oa~.97 16 0.00-173.73 1997 0.00 1.17 0.33 0.67 7.33 1998 1U1 0.00 0.17 4.00 0.00 1999 §1.iQ 0.11 0.17 0.33 0.00 Smalbnalllll l11m Pre-operational 2 0.08.().42 3 0.00-0.31 3 0.00-0.17 3 0.00-0.17 3 0.00-0.08 Post-opcracional 7 0.00.2.84 15 0.00-2. 73 IS 0.00-1.92 IS 0.00-0.62 16 0.00-0.32 1997 1.17 1.00 0.33 0.17 0.17 1991 ~ 1.00 0.17 0.00 0.00 1999 l.SO 0.17 0.33 0.00 0.00 La~att0lllllb11SS Prc-opcrational s 0.00-0.42 1 0.00-0.75 7 0.00-1.33 6 0.00-0.25 6 0.00-250 Post-operational 7 0.00-1.33 15 0.00-2.18 IS 0.00-0.63 15 0.00-1.33 16 0.00-0.67 1997 0.17 .1llJl!I Lil 1.00 0.17 1998 0.67 0.50 0.00 0.17 0.00 1999 lfil I.SO 0.17 0.00 0.67 Wollqe Prc-opcratioml 3 0.00-0.08 6 0.00-0.08 6 0.00-0.01 s 0.00-0.08 s 0.00-0.0I Post-operational 7 0.00-0.24 IS 0.00-0.09 IS 0.00-0.13 15 0.00-0.09 16 0.00-0.45 1997 0.00 0.00 0.00 0.00 0.17 1998 0.00 0.00 0.00 0.00 0.00 1999 0.00 0.00 0.00 0.00 0.00 PumpldnsuJ ~rational 1 0.08-7.00 8 0.17-7.88 8 O.SB-26.16 6 O.OO-ll.2S 7 0.83-12.12 Post-operation.al 7 0.67-2.82 IS 0.35-8.61 15 0.90-13.28 IS 0.61-19.70 16 0.27*5.33 1997 I.SO 0.50 2.SO 2.33 3.00 1998 l.33 I SO 3.33 3.67 2.33 1999 o.so 0.83 0.13 o.so 1.17 Tuse/Mdd-Pn:-opcntional 7 0.00-0.96 8 0.00-4.04 8 0.02*2.67 6 0.00-3.71 7 0.33-3.13 Poa1-operational 1 0.13-4.46 IS 0.56-40.27 IS 0.00-19.36 15 0.00-17.SO 16 0.00-1U8 l!il97 ~ lli.J1 6.17 3.13 3.33 1998 MJ1 10.67 1.00 0.67 a.so 1999 W!Q. 1.00 0.33 0.00 1.17 Spanail shiner Pn:-opcrational 7 0.00*1.89 8 0.00-1.75 8 0.00-13.08 6 0.00-S.66 7 0.00-7.33 Posr-opcrational 7
- 0. 00-4.00 IS 0.00-32.64 IS 0.39-31.89 IS 0.20-19.SO 16 0.00-21.33 1997 1.17 0.17 0.00 0.00 0.33 1998 afil 18.17 0.17 0.17 0.00 1999 0.33 0.21 0.00 0.00 0.17
- N= the number ofyean m the lustonc~I pcnod (!"**or post*opcr.111omll) 1tu1..imphng oc'urred in~ given month.
IJ99l'&tl'S,fnJ'Pf/1&11*1D.18.J1.JI -1111/00 No-Am><- Inc.
Table3-JJ Number and 1ien:ent composition of fishes collected by 16 fl semi-balloon trawl per month at trawl tnansects in Conowingo Pond, June-Oc:lober 1999. June Jul;t: Au~st Sel!tember Ocloher o.. crall Number Percent Number Percent Number Percent Number Percent Number Percent Number Percent A mcrican shnd 0 000 0 0.00 0 0.00 0 0.00 I 1.92 I 0.04 Gizzard shod 1,755 73.16 2 l.S3 I 1.09 7 3.83 0 0.00 1,765 61.78 Common carp IO 0.42 3 2.29 I 1.09 4 2.19 I 1.92 19 0.67 Spotl:nl sinner II 0.46 0 0.00 0 0.00 3 1.64 I 1.92 15 0.53 Blunlnose mmnow 7 0.29 0 0.00 0 0.00 0 0.00 0 0.00 7 0.25 Quill back 0 0.00 I 0.76 0 0.00 I 0.55 0 0.00 2 0.07 Shonhead rcdhorse 0 0.00 I 0.76 0 0.00 0 0.00 I 1.92 2 0.07 White catfish 0 0.00 I 0.76 0 0.00 0 0.00 0 0.00 I 0.04 Brown bullhead I 0.04 0 0.00 4 4.35 I 0.55 0 0.00 6 0.21 Channel catfish 311 12.96 81 61.83 76 82.61 146 79.78 6 11.54 620 21.70 White perch 0 0.00 0 0.00 0 0.00 0 0.00 I 1.92 I 0.04 Pumpkinsced 2 0.08 0 0.00 2 2.17 I 0.55 2 3.85 7 0.25 Bluegill 10 0.42 29 22.14 I 1.09 3 1.64 20 38.46 63 2.21 Smnllmouth bass 4 0.17 I 0.76 0 0.00 0 0.00 0 0.00 5 0.18 Largemouth bass 4 0.17 I 0.76 6 6.52 0 0.00 4 7.69 IS 0.53 White crappie 2 0.08 0 0.00 0 0.00 0 0.00 0 0.00 2 0.o7 Tessellated darter 280 11.67 II 8.40 0 0.00 16 8.74 12 23.08 319 11.17 Yellow perch 2 0.08 0 0.00 0 0.00 I 0.55 3 5.77 6 0.21 Walleye 0 0.00 0 0.00 1.09 0 0.00 0 0.00 I 0.04 Overall 2,399 100.00 131 100.00 92 100.00 183 100.00 J2 100.00 2,857 100.00 Number of.se.u1es 13 10 8 10 II 19 /999PBAPSJnlrp1/Tlu J.10,11,2$,29,JJ
- 1111100
Table 3-34 Monthly C3tth per effort (number llt'r 10 min haul) for fishes collected by 16 ft semi-balloon trawl at trawl transects in Conowingo Pond, June-October 1999. June Jul~ AUG!!lit Sej!tember October Mean American shad 0.00 0.00 0.00 0.00 0.11 0.02 Gizzard shad 195.00 0.22 0.12 0.78 0.00 39.22 Common carp l.J4 0.33 0.14 0.44 0.11 0.43 Spottail shiner 1.25 0.00 0.00 0.33 0.11 0.34 Bluntnose minnow 0.78 0.00 0.00 0.00 0.00 0.16 Quill back 0.00 0.11 0.00 0.11 0.00 0.04 Shorthead redhorse 0.00 0.11 0.00 0.00 O.ll 0.04 White catfish 0.00 0.11 0.00 0.00 0.00 0.02 Brown bullhead 0.11 0.00 0.44 0.11 0.00 0.13 Channel cat.fish 35.03 9.00 9.14 16.22 0.67 14.01 White perch 0.00 0.00 0.00 0.00 0.11 0.02 Pumpldnseed 0.22 0.00 0.22 0.11 0.22 0.16 Bluegill 1.11 3.22 0.11 0.33 2.22 1.40 Smallmoulh bass 0.44 0.11 0.00 0.00 0.00 0.11 Largemouth bass 0.44 0.11 0.71 0.00 0.44 0.34 White crappie 0.22 0.00 0.00 0.00 0.00 0.04 Tessellated darter 34.81 1.22 0.00 1.78 1.33 7.83 Yellow perch 0.25 0.00 0.00 0.11 0.33 0.14 Walleye 0.00 0.00 0.12 0.00 0.00 0.02 Overall 270.80 14.54 JJ.00 20.32 5.76 64.47 Number o[. S£!!..cies 13 JO 8 JO )) 19 1999PBAPS.fnlrpt!Tbs 3-11.1 S.22.26,30.3-1
- 2111100 Normandeau Associat~s. Inc.
Table 3-35 Catch per dTort (11umber per 10 min haul) for fishes collected by 16 ft semi-balloon trawl at stations on trawl transects In Conowingo Pond, June-October 1999. Slation Jll 322 32l 341 342 343 371 372 J7J Mean American shad 0.00 0 00 0.00 0.00 0.00 0.00 000 0 20 0.00 0 02 Gizzard shad 000 0.42 30.20 J 10 20 0 20 9 40 0.00 000 2.60 39 22 Common carp o 4S 0 2S 0.60 0 60 0 40 1.00 000 060 0.00 0 43 Spo11ail shiner 0.20 0 25 1.40 0.00 0 00 0 40 000 0 20 0 60 0 34 Blnnlnose minnow 000 000 0.00 000 0.00 0.00 000 0.00 1.40 0.16 Quillback 0 20 0.00 0.00 000 000 0 00 000 000 0 20 0 04 Shor1hcnd rcdhorsc () 00 0 20 0.00 000 000 0 00 000 000 0 20 () 04 White c;nfish 000 0.00 0.00 0 20 000 000 000 000 000 0 02 Brown bullhe.id o no 0 00 0.00 060 0.40 0.20 000 000 0.00 0 13 Channel catfish 8 45 20.4S 6.40 23.00 17 00 120 4.60 34 00 II 00 14 01 While perch 0110 000 000 0 20 0.00 0.00 0.00 0.00 0.00 0.02 Pumpkinsccd 0 00 0.00 0.40 0.20 0.00 0.20 0.00 000 0.60 0 16 Bluegill 0.60 0.60 0.60 3 60 0 20 HO 0 40 0 20 I 00 IAO Snmllmouth bass 0 00 0.00 0.40 000 000 0.00 0 20 0.00 0.40 0 11 Largemouth bass 0 2S 0 42 0.40 060 0.20 0.20 0.00 0.00 I 00 0.34 White cmppie 0.00 000 0.00 000 0.00 0.40 000 000 000 0.04 Tessellated daner 6.20 34.0S 6.40 580 1.00 14.60 020 0 40 1.80 7 83 Yellow perch 0.20 0.4S 0.40 000 0 00 0.20 0.00 0.00 0.00 0.14 Walleye 0.00 0.22 0.00 0.00 000 0.00 0.00 0.00 0.00 0,02 0l'unll /6.55 j7.JJ 47.10 345.00 19.40 33.20 5.40 35.60 20.80 64.47 Number of species 8 10 10 10 7 II 4 6 II 19 /999PBAl'Sjillrpt/T'b J.Jj
- 2111100 Normandeau Auoclot*1. Jnc.
Table3..J6 Comparison or lhe monthly catch 11<<r efTon (number IH!' JO min haul) (or the common and En\\'ironmenlal Prvl<<tion Agency designated, reprl!Sl!nlatlve, Important species collccl*d at 1111wl transects stations;,. Conowlngo Pond in Junt-Oc:tnbtt. "*".desicnalft a IH!riod when no effort was upended. Underiined CPEs are greater than historical values and h:aliciud are less than hislorlc:al values. Jun* Juh* Aug~* S..(!ttmber October N* Rangto N* Rans* N* Range N* Range N* Range ll'Tritc aappit Prc-opcralional 7 0.1S-2S.59 1
- 0. 76-269.54 1
J.21*19.46 7 1.14-102.31 1
- l. lo.66.46 Post-opcralional 7
0-5.33 7 0.2(}.7.38 7 0.31-4.47 7 ().(i.46 a 0.20-2.12 1997 0.11 2.78 0.67 0.22 0.22 1991 0.44 0.00 0.33 0.11 0.19 1999 0.22 0.00 0.00 0.00 0.00 C11111111tl ""'fid Prc-opcralional 7 US-120.31 7 ll.7S-134.27 1 9.0-141.14 1 4.61-495.01 1 9.41-41.70 Post-operational 7 3.43-S9.35 7 6.44-84.SO 7 0.80-166.29 7 7.2S-18S.S4 I 2.10-133.28 1997 4S.20 90.89 94.44 Sl.78 15.83 1998 36.78 77.58 61.17 23.33 7.11 1999 35.03 9.00 9.14 16.22 0.67 Bble,iJI Pre-operational 6 0.05*1.77 7 0.02-17.lll 1 CH;S.01 1 0.54-11.77 1 0-35.5-4 Post-operational 7 0--0.09 7 0-3.31 0.30.11.08 1 0.25-13.92 0-9.63 1997 1.00 li..11 24.44 7.56 I.II 1998 0.78 11.14 2.25 3.44 2.00 1999 1.11 J.22 0.11 0.33 2.22 Gi::Md ""' Pre-opcralional 2 0.00--0.19 2 0.07-1.00 2 O.OQ.-0.38 2 0.00-0.12 POll-opentional 7 0.00.8.09 1 0.08-12.51 7 0.11*2.70 1 O.oo-6.25 I 0.00-2.27 1997 0.00 3.32 O.<< 2.00 lil 1998 ~ 0.14 w 0.22 0.56 1999 ~. 0.22 0.12 0.78 0.00 SllUl/JlrlMlllillaa Pre-operational 4 0.02-0.42 3 0.00-0.42 3 0.00-0.04 3 0.00-0.33 3 0 Pos1-opcralional 7 0 1 0.00.UO 1 0.00-0.45 7 0.00-0.23 8 0.00-0.31 1997 QM 0.94 0.11 0.33 0.11 19ll8 .1.1§ 0.00 0.00 0.00 0.00 1999 ~ 0.11 0.00 0.00 0.00 i..r-""'"- l'R-opmuional 2 0.03 6 0.00.0.JS 6 0.00-0.08 6 0.00-0.04 6 0.00-0.JO Poll-operadonal 7 0.00-0.lS 7 0.00-0.2S 1 0.00-0.09 7 0.00-0.07 8 0.00-0.01 1997 0.12 !l.ll IW 11..§1 0.00 1991 0.00 0.00 !!..21. !Ul 0.00 1999 M! 0.11 !!.11 0.00 IW w~ Pre-opcra1ional 0.02-0.14 6 0.00--0.12 6 O.OCMl.04 6 0.00-0.17 6 0.00-0.04 P0tt-opemionll 7 0.00-0.36 1 0.00.0.04 7 0.00-0.18 7 0.00-0.06 I 0.00-0.19 1997 0.00 0.00 0.00 0.11 0.00 1998 0.11 0.00 0.00 0.00 0.00 1999 0.00 0.00 0.12 0.00 0.00 Tas""'1u"'1rt6 Pre-opcmion.al 6 0.00.0.69 7 0.00.0.64 7 0.04-1.71 7 0.12-1.67 7 0.23-3.71 Post-openlioml 7 0.00.IS.SO 7 0.50.58.33 7 0.00-12.25 7 0.00.11.so 8 0.4s-4.80 1997 ~ 33 48 ?M.4 ll.ll L1.ll 1998 u.n 12.7S S.89 5.S6 0.19 1999 li.11 1.22 0.00 1.78 1.33 l'lunpkbueed Pre-operational 0.00.1.77 7 0.00.S.62 7 0.00-7.7S 7 0.08-S.23 7 O.OG-4.23 Pos1-operalional 7 0.08-1.25 7 0.00.l.44 0.40-3.20 7 O.S0-7.45 8 O.OG-4.33 1991 0.47 2.38 O.S6 0.33 1.19 1998 0.89 I.SO 0.22 2.19 U9 1999 0.22 0.00 0.22 0.11 0.22 SpanoiJ sltilur Prc-<>pc:r*lional 6 0.00*1 JI 7 0.03*2.60 7 O.OO*ll.27 7 O.<M-23.23 7 O.OG-4.26 Post-<1penlional 7 0.00-5 92 7 0.17-7.00 7 0.00-32.71 7 0.00.6.73 0.00-9.60 1997 1.2J O.S6 0.00 0.11 0.25 1998 2.00 !ill 2.69 l.S6 2.19 1999 I 25 0.00 0.00 0.33 011
- N* lite number of )'C"" 111 the lu!1onc~I period (pre-or post-opcralion.ai) th.II s.tmphng oc.:um:d in ~ IP"'" monlh.
1'99PBAPS/nlrpl!TU J-20.28.]1.16. Jn/loo ~Auoc-lnc.
Report on Thenn1l Conditions and Fish Popul1tlons in Conowlngo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 4.0
SUMMARY
AND CONCLUSIONS Monthly surveys were completed in June-October 1999, as prescribed in PECO's Study Plan and approved bj' the PADEP, to monitor the operation of zero cooling towers on fishes and thennal conditions in Conowingo Pond. The same sampling protocols utiiized during PBAPS pre-and post-operational studies and in 1996 to 1998 were employed in 1999. Compared to the historical record ( 1952-1998), river flows and inflow water temperatures in 1999 were lower. Specifically, river flows in sununer 1999 were substantially lower than those observed in 1996, 1997, and 1998. During the long-term monitoring period of 1996 to 1999 a wide range of hydrological conditions were observed; for example, in 1996 hydrological conditions were deemed above normal characterized by higher river flows and lower temperatures, whereas the 1999 period was characterized by lower river flows and higher temperatures. Thus, the fish community in Conowingo Pond presumably were exposed to near-worst summer temperature conditions in 1999 compared to summers of 1996 to 1998. PBAPS generally operated at the maximum power level achievable (<200%) in late summer, due to the end of cycle coast down (an arutual occurrence in spring through sununer) of Unit 3. Following the Unit 3 refueling outage, total power output was restored to near 200% (in early November). Inlet temperatures at PBAPS mirrored the pattern of variation in inflow temperatures, but were consistently l to 4°F higher than corresponding values at Holtwood Dam during the summer. Inlet temperatures in summer 1999 were higher for a longer period than in 1997 and 1998. Discharge.1. Ts were mostly 19 to 20°F above the Holtwood inflow temperatures or ambient inlet temperatures. Both are less than the designed criterion of 20.8°F Under the existing river flow and temperature conditions surveyed, the heated effluent quickly dissipated within 2 miles downstream of the PBAPS discharge. The heated discharge was primarily limited to the top 5 to 15 ft of the water column along the western shore at the Burkins Run transect and west to mid-pond areas at the Williams Tunnel and PA/MD State Line transects. The West location at Burkins Run, being nearest the discharge outlet, displayed the highest temperatures in the water colwnn, with surface values 7.5 to 13. 9°F higher than corresponding values at the PBAPS inlet. Although differences in profile.1.T values were noted among other locations and depths on transects downstream of the PBAPS discharge and at the transect upstream (Fishing Creek). the differences generally were <3°F. Similar variations were also observed between Holtwood Dam and the PBAPS inlet temperatures. Profile temperatures and patterns observed at downstream locations in summer 1999 (zero tower operation) were most similar to those observed under low flow conditions in 1995 when a minimum of three towers operated. DO conditions in the vicinity of PBAPS in 1999 were similar to seasonal, spatial, and diurnal variations observed historically. In determining whether or not zero tower operation affects the relative abundance, distribution, and species composition in Conowingo Pond, the following were evident in 1999: most of the monthly CPE's for the commonly collected species were within or above the historic range; CPE's among species and between stations were variable likely due to differences in year class strength; and no thermally stressed fish were observed. Overall, zero tower operation in 1999 had no discernible effect on the integrity of the balanced. indigenous fish community of Conowingo Pond. This conclusion also extends to some 1.2 million additional fish (as part of the ongoing American shad restoration program) that were introduced into Conowingo Pond via the East fish lift downstream of Conowingo Darn. Findings of no obvious adverse effects of zero tower operation on fish relative abundance are not surprising and indeed are consistent with results reported in the literature (Bennett and Gibbons J 974; Coutant 1972, 1974; Raney et al. 1973; Romberg et al. 1943; PECO 1975; Stauffer et al. 1975; Thorpe and Gibbons 1977). A major contributing factor for this conclusion is the fish behavioral response (preference or avoidance) to them1al discharge which assures continued propagation of balanced, indigenous, community. Conowingo Pond fishes are no exception in that regard; they are not trapped and thus they freely exercise their preference/avoidance behavior relative to PBAPS discharge. Because the 1999PBAPS.fnlrpr.doc. Ol/11100 65 Normandeau Associalirs, Inc.
Report Oil 'l'benul Condltlom and FWa Popalatlom ID Coaowillgo Pond Relative to bro Cooling Tower Opentlom at PBAPS, 1999 configuration and siz.c of the PBAPS thennal plume and its associated temperature profiles vary with the prevailing hydrological conditions fishes arc not consistcntly exposed to a specific temperature rise for a long time. The temperature regime created as a result of zero tower operation was within the tolerance limits of fishes; no direct mortality or stress was observed. The observations made during the monitoring in 1995 to 1999 are consistent with the laboratory-predicted responses ofConowingo fishes. Fishes can and will follow a temperature gradient They nonnally follow this gradient to or toward their preferred temperamre. The behavior of a given species often depends on the magnitude of change of temperature to which it may be exposed. It may be attracted to a higher or lower temperature. or it may avoid higher or lower temperature, or it may not react. The preference and avoidance behavior of fishes is an important factor which govern their distribution in relationship to heated discharges. Lethal temperatures arc avoided by motile aquatic cnganisms. Thus, fishes generally avoid the hotter part of plumes. Observations at power stations discharging relatively large volumes of heated water into rivers and lakes confinn the absence or rarity of thennal fish kills or serious biological damage. Upper temperature tolerance limits arc not applicable unless fishes are trapped and have no escape routes; fishes at PBAPS arc not trapped. Even in a trapped situation, fishes can withstand a sudden temperature change of20°F, depending upon the acclimation temperature. The fish community in Conowingo Pond shows great seasonal and annual fluctuations in abundance under natural conditions, adapted to living over a wide range of temperatures within its own balance. This is well corroborated from the observations that the relative abundance of common fishes in Conowingo was within the historical range both during the complete shutdown of PBAPS in 1987 to 1989 and with full operation without cooling towers in 1996 to 1999. Based on these observations, a fiLir conclusion can be made that the propagation of a balanced, indigenous fish conununity in Conowingo Pond can be expected without operation of cooling towers at PBAPS. I 999PBAPS.ftrlrptdoc - 02/21100 66 NormandMU. b1octatu. Inc.
Report on Thermal Condirions and Fish Populations in Conowingo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 5.0 LITERATURE CITED Bennett, D. H. and J. W. Gibbons. 1974. Growth and condition of juvenile largemouth bass from a reservoir receiving themtal effluent,µ. 246-254. In J. W. Gibbons and R. R. Sharitz (eds.) Thennal Ecology Symposium, U.S. Atomic Energy Connnission, Natl. Tech. Infor. Ser... ice, Springfield, VA. Coutant, C. C. 1972. biological aspects of thermal pollution, II. Scientific basis for water temperature standards at power plants. CRC Critical Reviews in Envirorunental Control 3(1): 1-24. Coutant, C. C. 1974. Temperature selection by fish - a factor in power plant impact assessment. Symposium on the Principal and Biological Effects on the Envirorunent of Cooling Systems and Thennal Discharges at Nuclear Power Stations. lchthyological Associates, Inc. 1976. Supplementary materials prepared for the Environmental Protection Agency 316(a) demonstration for PBAPS Units No. 2 and 3 on Conowingo Pond. Prepared for Philadelphia Electric Company, Philadelphia, PA. Nonnandeau Associates. 1997a. A report on the assessment of fish populations and thermal conditions in Conowingo Pond relative to variable cooling tower operation at the Peach Bottom Atomic Power Station. Prepared for PECO Energy Company, Philadelphia, PA. Normandeau Associates. l 997b. Study plan for fish protection in Conowingo Pond relative to zero cooling tower operation at Peach Bottom Atomic Power Station, Pennsylvania. Prepared for PECO Energy Company, Philadelphia, PA. Normandeau Associates. 1998. A report on the thermal conditions and fish populations in Conowingo Pond relative to z.cro cooling tower operation at the Peach Bottom Atomic Power Station. Prepared for PECO Energy Company, Philadelphia., PA. Nonnandeau Associates. 1999. A report on the thermal conditions and fish populations in Conowingo Pond relative to zero cooling tower operation at the Peach Bottom Atomic Power Station. Prepared for PECO Energy Company, Philadelphia., PA. Philadelphia Electric Company. 1975. Materials prepared for the Environmental Protection Agency 316(a) demonstration for PBAPS Units No. 2 and 3 on Conowingo Pond. Philadelphia Electric Company, Philadelphia., PA. Purdy, E. J., Jr., and C. A. Silver. 1975a. Analysis of ambient water temperature in Conowingo Pond, Station 2 vs. Station 18. Philadelphia Electric Company. Purdy, E. J., Jr., and C. A. Silver. 1975b. Analysis of ambient water temperature in Conowingo Pond, Station 13 vs. Station 18. Philadelphia Electric Company. Purdy, E. J., Jr., and C. A. Silver. l 975c. Analysis of ambient water temperature in Conowingo Pond, Station 13 vs. Station 2. Philadelphia Electric Company. Purdy, E. J., Jr., and C. A. Silver. 1975d. Analysis of ambient water temperature in Conowingo Pond, comparison of pre-operational period vs. post-operational. Philadelphia Electric Company. Raney, E. C., B. W. Menzel, and E. C. Weller. 1973. Heated effluents on aquatic life with emphasis on fishes, a bibliography. Ichthyological Assoc., Bull. 9. 65lpp. RMC Ecological Division. 1979. Relationships of preferred, avoided, upper, and lower lethal temperatures of fishes of Conowingo Pond, Pennsylvania. Prepared for Philadelphia Electric Company, Philadelphia., PA. RMC Environmental Services. 1985. Water quality studies relative to Objectives 1 to 3 of Article 34 for the Conowingo Hydroelectric Station (Project No. 405). Prepared for Philadelphia Eleqtric Company, Philadelphia, PA. J999PBAPSfnlrpt.doc - 02121100 67 Normandeaw Associates, Inc.
Report on Thermal Condition* and Fish Populations In Conowingo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 RMC Environmental Services. 1994. A report on the fish populations in Conowingo Pond relative to the NPDES pennit application for the Peach Bottom Atomic Power Station, Pennsylvania. Prepared for Philadelphia Electric Company, Philadelphia, PA. Robbins, T. W., and D. Mathur. 1974. Peach Bottom Atomic Power Station pre-operational report on the ecology of Conowingo Pond for Units No. 2 and 3. Ichthyological Associates, Inc., Drumore, Pennsylvania. xvii + 349 pp. Robbins, T. W., and D. Mathur. 1975. Peach Bottom Atomic P.ower Station post-operational report No. 4 on the ecology of Conowingo Pond for the period January 1975-June 1975. lchthyological Associates, Inc., Drumore, Pennsylvania. xxiii + 322 pp. Robbins, T. W., and D. Mathur. 1976. Peach Bottom Atomic Power Station post-operational report No. 5 on the ecology of Conowingo Pond for the period July 1975-December 1975. lchthyological Associates, Inc., Drumore, Pennsylvania. Prepared for Philadelphia Electric Company. xxiii + 501 pp. Romberg. G. P., S. A. Spigarelli, W. Prepejchal, and M. M. Thommes. 1974. Fish behavior at a thennal discharge into Lake Michigan, p. 296-312. Jn J. W. Gibbons and R.R. Sharitz (eds.), Thermal Ecology Symposium, U.S. Atomic Energy Commission, Natl. Tech. Jnfor. Service, Springfield, VA. Shannon, C. E. and W. Weaver. 1948. The mathematical theory of communication. Univ. of Illinois Press, Urbana, Ill. Stauffer, J. R., D.S. Cheny, K. L. Dickson, and J. Cairns, Jr. 1975. Laboratory and.field temperature preference and avoidance data of fish related to the establishment of standards, P. 119-13 9. Jn S. B. Saila (ed.) Fisheries and Energy Production: A Symposium, Lexington Books, D. C. Heath and Company, Lexington, MA. Thorpe, J. H. and J. W. Gibbons. 1977. (eds.) Energy and environmental stress in aquatic systems, Natl. Technical Infonnation Center, Springfield, MA. Whittaker, R.H. and C. W. Fairbanks. 1958. A study of plankton copepod communities in the Columbia Basin, southeastern Washington, p. 368-388. Jn W. E. Hazen (ed.), Readings in population and community ecology. W. B. Saunders Co., Philadelphia, PA. 1999PBAPSfnlrpt.doc - 02121100 68 Non11and111au Associates, Inc.
APPENDIX A MONTHLY FLOW DURATION CURVES JUNE-OCTOBER HISTORICAL (1952-1998) VERSUS 1997, 1998, AND 1999 AND JOINT OCCURRENCE OF DAILY WATER TEMPERATURE AND RIVER FLOW JUNE-OCTOBER HISTORICAL (1956-1998), 1997, 1998, AND 1999 1999PBAPS.[nlrpt.doc. 02121100 Normandeau Assoc1ateJ, Inc.
80000 70000 F L 60000 0 w 50000 I 40000 N c F s 30000 20000 10000 0 Duration curve of average daily river flows at Holtwood Dam, 1952 to 1997 {historical), 1997, 1998 and 1999. MONTHaJUNE I I I I r--- --,------,------~------~-------~------~------r------r------T------, -1. I I r. T I I I I I I I I I I I I I I I I I I I .J - _t - _ t_ - 1_ - L.. - L - .L - ~ I I I I 1 I I I I I I I I I I I I I' - r - - T - I
~------~------~-------~------~------~------L -- -
1 I I I .L-------"- I I I I I I I I I r - - - - - - r - - - - - - r - - 1 I I I - -----r-..-.-..-~ -:- ------~ ------ ~ ------ ;* ----- ~ I I I I I .1..------..i I I I I I I + - - - - - -.} - - - - - - - - - - - -:- - - - - - -:- ~ - -'- -~-~~----- ~----- I I - r------,
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I I I,. I I I I I I I I I I I T------,------,------~------~-------~------r------r------r----**-T------; I I I 0 10 20 30 40 50 60 70 80 90 100 X TIME EQUALLED OR EXCEEDED YEAR 1952-98 1997 1998 1999
80000 70000 F L 60000 0 w 50000 I 40000 N 30000 c F 20000 s 10000 0 Duration curve of average daily river flows at Hallwood Dam, 1952 to 1997 {historical), 1997, 1998 and 1999. MONTH,.JULY i ~ ------~ ------~ ------~ -------!------+ ------;-------~ ------~ ------~ ------~ 3 ~ -- -- j - - - - - - J ------J _ -----_: _ -----_:_ ------:_ ------~ ------ ~ ------~ ------j ~ I I I I I I I I I I I I 0 I I I r I I I I I I 1 - 1-r - r - r - I I I I I I I J. - ..J - ..J - L L.. - 1- - ..L -
- 4.
i I I I T -- I T --- ~ ~ - - - - ~ - - - - - - -:- - - - - - _;_ - - - - - -:- - - - - - -:- - - - - - - ~ - - - - - - ~ - - - - - - +. - - - - - - ~ I t I I ~ :-::-_ ~ - L- ~ I I -,------r- - ----; I I I I l ~-- 1 - - ~ +-- ---- -:- -----* -r --- I I I I I I I ~---- I I I i., t l I I ...I ---...c.. - _,_ - - ~ ~ ~ I I I I
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+ - - - - - - - - - - -: - - - - - - -: - - - - - - -:- - - - - - -!- - - - - - - :- - - - - - - :- - - - - - - ~ - - - - - - + - - - - - - ~ rj 0 10 20 30 40 50 60 70 BO 90 100 ~ TIME EQUALLED OR EXCEEDED YEAR 1952-98 1997 1998 1999
F L 0 w I N c F s 80000 70000 60000 50000 40000 30000 20000 10000 0 I T---- .J. ___ I "f - Duration curve of average daily river flows at Holtwood Dam, 1952 to 1997 {historical), 1997, 1998 and 1999. MONTH*AUGUST I ---r------~------r------ I I I I I I ..1 - ...J - I I I I I
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1 I I I I I I I I I I I I l.------..1. I I I I -r "l' -- ----, ------,---- r - r T------,- 1 I I I I I I t I I ..L * ---- - *' _J - L.. - 1.. - .L. - .1 I T-I I I I I I I t I I I t I I r - - r - T - i I 1
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- ;~~::~::::::~::::;:::;:-;::;~~:;':~~~~;;~~;;:~~,;;~~::.~~:..~~..;~,;:~~;:.,;,~~~
~ - -........ ---=-1-- - : -_ -*: ~~--... - - _, - - ~:....:...:--- -,- - - - - - -~ - - - - - - L.. - ~ - +.. - ~ 1 I I .J I I T 0 I ---7------~------,---- 10 20 30 YEAR 1952-98 I I I I I ---~------r------r---- -- r------T " 110 50 60 70 80 90 100 % TIME EOUALLEO OR EXCEEDED 1997 1998 1999
F L 0 w I N c F s 80000 70000 60000 50000 .40000 30000 20000 10000 0 I Duration curve of average daily river flows at Holtwood Dam, 1952 to 1997 (historical), 1997, 1998 and 1999. MONTH= SEPTEMBER I I .. T - ___ "T ___ _ ---r------~------r------T------~ I I .l. I ' I I T .L I I .L I,- 0 I I
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I I I I I I I I ....J - L- - -~ - .L - ..l I I I I I I I I I I I I I I I I I I I I I I I I 1 - r- - - r - - - - - - r - - - - - - T - - -r I I I I I I I I .,A __ _ -l - ....J - 1-L --J..------~ I -~ - --~------~------~-------~ I I I i -. I ..J - ...J - I I., I
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80000 70000 F L 60000 0 w 50000 I 40000 N 30000 c F 20000 s 10000 0 I . T - ' J. - I I l Duration cunre of average daily river flows at Holtwood Dam, 1952 to 1997 (historical), 1997, 1998 and 1999. MONTH=OCTOBER I I I -r------r------r-1 ' r - _..J ______ _._ l... - .L.. - I I I I I -T------, I o I -.1. ____..J. o I I I I I I -i- - r- - - r -r------ I I I I I I I I ~------~------~------~-------~------~------~------L------J.------~ I I I I I I I I I I I I I I I I I I I I I I I I I I I
,------,------~-------~------~------~------r------T------,
I I I I I I I I I .a. - I I I I I I I I I I l I I T------1-- - r - I o T------1 I ~ - ~ _-.to ___ - - ~ - ~--=---=;-=== ~- I I I - - - - _, - - - - - - -: - - - - - - -:- - - - - - -:- - - - - - -:- - - - - - - r - - - - - - r ' 1 -*----- ~ 'I I 1-r I 0 10 20 30 40 50 60 70 BO 90 100 ~ TIME EGUALLED OR EXCEEDED YEAR 1952-98 1997 1998 1999
w A 100 T 95 E 90 R 85 T BO E 75 M 70 p 65 E R 60 A 55 T 50 u 45 A E 40 F Duration curve of average daily river temperatures (° F) at Holtwood Dam, 1956 to 1997 {historical), 1997, 1998 and 1999. MONTH.. JUNE I I I I I - r - T r - I I I I I I -1 I I I I I I I I t r T ' - r T - o I I I I I I I I I I r T - I I T - -1 I I l I I I I I I I I I I I -- ~ I T - r"" - T - - -1 I I I I I I I I I I I ~ - --- ~-;..,_-:-:- --*~ - ~ ~ - - - - - - ~ - - - - - - ~ - - - - - - -:- - - - - - - ;... - - - - - -
- ~ - - - - - - ~ - - - - - - -:
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- 1 -
I I I I I I I I I I I I I I 7 - I - T - - r - - - - - - T - I - I I I I I I I I I I I I I I I I I T - - r - - - - - - T - - r - - - - - - I - I - I I I I I I I I I I I I 1 I I I I I T - I - T - I - - r - - - - - - T - I - 0 10 20 30 40 50 60 70 80 90 100 % TIME EQUALLED OR EXCEEDED YEAR 1956-98 1997 1998 1999
w 100 A 95 T E 90 R 85 80 T 75 E M 70 p 65 E 60 R 55 A T 50 u 45 R 40 E F Duration curve of average daily river temperatures {0 F) at Holtwood Dam, 1956 to 1997 {historical), 1997, 1998 and 1999. MONTH*JULY I I I I I I I I T - 1 I T - r - T - -1 J I I I 1 I I I I I I I I I I I I I I T - I I T - I I T - -1 I I I I I t I I I I l I I I I 'f l I T - 1 I T -1 I I I I I I I I I t I I J I I I I f T - 7-... ---~--......-..;-..;:,.:,, T...:...::. - I - T- - -1
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r I I I I t I I I T - I I i I - - r - T - I I I I I I I I I I I I I I T - -i - - r - - r - - * - r - - - - - T - I I l I I I I I I 1 I I T - - r - - - T - I - - r' - T - I I I I I I I I I I I I I I I I I I I 1 T - - r - - - - - - T - - r - - - - - - T - I I I I I I 1 I I I I I I T - r - T - - r - T - I I I I I I I I I I I I I I I I I I T - - r - - - - - - T - i i T - I I I I I I I I I I I I I I I I I I I I T - - r - - - - - - T - - r - - - - - - T - I I I I I I I I I I I I t I I I I I T - - r - - - - - - T - - r - - - - - - T - I 0 10 20 30 40 50 60 70 80 90 100 X TIME EQUALLED OR EXCEEDED YEAR 1956-98 1997 1998 1999
w A T E R T E M p E R A T u R E F 100 95 90 85 80 75 70 65 60 55 50 45 40 Duration curve of average daily river temperatures (° F) at Holtwood Dam, 1956 to 1997 (historical), 1997, 1998 and 1999. MONTH*AUGUST l I I I I I I I I T I I T' - r T -1 I I I I I I I I I I I I I I T I T - l r - T - "'\\ - -1 I I I I l I I I I I I I I I r T r r - I
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I I T - I T - ---"""~r--~---;..;::..;:-: I l I I I I I llf i.a__.,: e 1----- -., - - - - - - -,- - - - - - - r - - - - - - T - - r - - - - - - T - I I I l I I I I I T - - r - - - - - - T - C-T - I I I I I I I I I I T - - r - T - - r - - T - t I t I I I I I I I I I I T - - r - T - - r - - *- - - - T - I I I I I I I I I I I 'i' - I - r - - - - - - T - - r - - - - - - T - I I I I I I I I I I I I I t I I I T - 1 - - r - - - - - - r - - - - - -, - - - - - - -,- - - - - - - r - - - - - - T - 1 - I t I I I I I I I I I I I I I I I I I I T - - r - - - - - - T - - r - * - - - - - T - ~ I I I I I I I I I 1 I I I I I I I I I I - 1 - - r - - - - - - 1 - - r - - - - - - I I 0 10 20 30 40 50 60 70 80 90 100 % TIME EQUALLED OR EXCEEDED YEAR 1956-98 1997 1998 1999
w A 100 T 95 E 90 R 85 T BO E 75 M 70 p E 65 R 60 A 55 T 50 u 45 R E 40 F Duration curve of average daily river temperatures (° F) at Holtwood Dam, 1956 to 1997 (historical), 1997, 1998 and 1999. MONTH*SEPTEMBEA I I I I I I I I -r - -i- - r- - T' - ""I - r- - T - -1 I I I I I I I I I I I I I I I I T - l r - T' - I T - l -1 I I I I I I I I I I I I - - r - 'T" - r - T - I I I I t I I I I I I I - - r - T - r - - T - -1 I I I I I 1 I I I I I - r - T - I I T - -1 I o I
~
I I I I T - r T ...--..-,. ~~,,.:::-~~-~-~-.::.,,;;;_- =-.;;;_-: I I I I I I I I I I T - I T - I I -t I ~ a I T - - r - - - - - - T - I I T - I I 1 I I I I I t I I t T - I -
- - r- - - - - - -
T - I - - r - - - - - - T - I - I I I I I I I I I 1 I T - - r - - - - - - T - - r - - - - - - T - i I I I I I I I I I I I I I I I I 7 - I - T - i - r - - - - - - T - i -1 I I I I I I I I I I I I I I I I I T - l - T - I - - r - - - - - - T - I - - - I I I l I I I I I I I I I I I I T - T - - I - - T - I - I I 0 10 20 30 40 50 60 70 80 90 100 ~ TIME EOUALLEO OR EXCEEOEO YEAR 1956-98 1997 1998 1999
w 100 A 95 T E 90 A 85 80 T 75 E M 70 p 65 E 60 R A 55 T 50 u 45 A 40 E F Duration curve of average daily river temperatures (° F) at Holtwood Dam, 1956 to 1997 {historical), 1997, 1998 and 1999. MONTH=OCTOBER I I I I I I I t I l T 1 r- - T - r - T 1 -1 I I I 1 I I I I I I I I I I I I I I T - - r - T - r - T - I I I I I I t I t I I r - T - J T - 1 - -1 I I I I I I I I I I -i- - r * - - - - - - T - r - - - - - - T -1 I I I I I I I I I I I I I -r - - - - 1 - - r - r - - r- - T - I I I I I I I T - I I T - -1 - - - --;--..;:;..::: - - - r - - - - - - T - - r - - - - - - T - 0 10 20 30 40 50 60 70 80 90 100 X TIME EOUALLEO OR EXCEEOEO YEAR 1956-98 1997 1998 1999
JOINT OCCURRENCE OF DAILY HOLT'llOOD FLOWS AND TEMPERATURES, 1958
- 1998.
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MOHTll*JUNE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HOLTWDOD DAILY AVG TEMPEAATIJAE 86 AND 40*48 50*59 80*811 70*78 80*85 GREATER TOTAL N
PCTN " PCTN " PCTN H re TN H PCTN H PCTH N PCTN HOLTWOOD DAILY AVG FLOW 2,500*4,988 1 o.oa 1 o.oa S,000* 7,499 21 1.85 17 t.34 4 0.31 42 3.30 7,500*11,998 20 1.57 38 2.99 I 0.08 59 4.84 10,000*14,999 10 0.79 157 12.35 82 11.45 13 1.02 282 20.01 t5,000*19,9811 II 0.71 200 15.74 28 2.05 235 tB.49 20,00D*20,99!1 1 o.oa 37 2.91 248 18.35 20 2.28 313 24.83 30,000*311,998 28 2.05 118 9,38 17 t.34 182 12.75 40,000*49,999 I 0.08 21 t.85 so 3.03 3 0.24 75 s.eo 50,000 PLUS I 0.08 8 0.47 58 4.511 55 4.33 2 0.18 122 9.60 TOTAL 2 0.111 1 o.ss 181 12.117 888 88.20 215 18.92 18 t.42 1271 100.00
JOINT OCCURRENCE OF DAILY HOLTWOOO FLOWS AHO TEMPERATURES, 1958
- 1998.
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MONTHoJUL Y * * * * * * * * * * * * * * * * * * * * * ** * *.*. *.*..**.***.*.*..***.***.* * **..*...******.
HOLlWOOO DAILY AVG TEMPERATURE 88 AND 110*89 70*70 110*85 GREATER TOTAL N PCTN N l'CTN H PCTH H PCTH N PCTN HOLTWOOD DAlLY AW FLOW 2 1500*4,999 54 4.111 45 3.411 89 7.811 s,000-1,4119 10 o.n 82 1.12 511 4,33 1511 12.22 7,500-9,999 20 1.55 128 0.80 311 3.02 187 14.411 10I000*14 I 009 57 4.41 218 18,1111 UI 1.24 291 22.s1 15,000*19,999 85 5.03 117 0.05 4 0.31 1811 14.38 20,000-20,009 117 11.05 1111 8.85 1 0.08 204 15.78 30,000*30,11119 511 4.40 18 1.39 711 5.88 40,000*40,91111 37 2.88 7 0.54 44 3.40 50 1000 PLUS 9 0.70 37 2.88 2 0.15 48 3.71 TOTAL 0 0.70 401 31.01 722 55.114 1111 12.45 1293 100.00
JOINT OCCURRENCE OF DAILY HOLTWOOD FLOWS AND TEMPERATURES, 1958
- 1998.
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MONTH*AllOUST * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HOLTWOOD DAILY AVG TEMPERATURE 88 AND 40*48 80*118 70*78 80*85 ClllEATER TOTAL N
PCTN N PCTN N PCTll N PCTN N PCTH N PCTN HOLTIIOOD DAILY AVO FLOW 2,500*4,889 12 0.81 125 8.43 54 4.08 191 14.'42 5,000*7,'498 53 4.00 171 12.81 157 5,08 291 21.9a 7,500*8,1198 1 o.oa 44 S.32 148 11.02 24 1.81 215 tll.23 10,000*14,9811 113 11.53 1511 11.77 9 0.88 278 20.98 15,000*111,9911 112 .... 5 11 5.81 2 0.15 191 14.42 20,000*29,9119 I 0.08 75 5.88 Ill 1.21 92 11.94 30,000*311,1108 33 2.48 7 0.53 40 3.02 40,D00*49,999 1 0.53 1 o.oa 8 o.ao 50,000 PLUS a 0.45 13 o.oa 19 1.43 TOTAL 1 o.oa 7 o.53 4112 34.117 1189 52.75 158 11.77 1325 100.00
JOINT OCCURRENCE OF DAILY HOLTWDOD FLOWS AND TEMPERATURES, 1958
- 1998,
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- tlJHTll*Sl!PTEMBER * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HOLlWOOD DAILY AYO TEMPERATURE 8CI AND 80-89 70*79 80*85 GREATER TOTAL N
PCTH N PCTH N PCTN N PCTN H PCTN HOLT'tlOOO DAILY AVG FLOW 0*2,500 II 0.411 10 o.ao 9 0.72 25 2.00 2,!500*4,1199 8 0.48 1!53 12.25 93 7.45 a 0.84 280 20.82 5,000*7,499 28 2.24 17CI 14.09 !53 4.24 11 o.ee 288 21.411 7,500*11,91111 12 o.ea 155 12.41 49 a.112 1 0.58 223 17.85 I 0t000*14 I 91111 14 1.12 134 10.73 2:> 1.84 3 D.24 174 13.93 t 5I000*1II,9911 411 3.112 73 5.84 8 0.114 t o.oa t 31 10.-49 20,000*211,9911 37 2.911 311 2.811 7 0.511 80 8.41 30,000*39,999 22 1.711 12 0.911 34 2.72 40,000*411,999 8 0.48 8 0.84 2 o.t8 18 1.28 50,000 PLUS 28 2.oe a 0.84 4 0.:12 38 3,04 TOTAL 200 18.01 7111 110.113 2411 19.94 39 3.12 1249 100.00
JOINT OCCURRENCE OF DAILY HOLTWOOD FLOWS AHO TEMPERATURES, 1956
- 1998.
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MONTH,,OCTOBER * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HOLTWOOD DAlLY AVG TEMPEFIATUR!
ee ANO 40<<19 50*59 60*89 70*79 80*85 GREATER TOTAL N POTH N PCTN N PCTN N PCTN N PCTN N PCTN N PCTN HOLTWOOO DAlLY AVQ FLOW 0*2,500 8 0.83 5 0.39 13 1.0:J 2,500*4,999 22 1.74 98 7.58 54 4.27 4 0.32 I 0.08 177 13.118 5,000*7,499 59 4.88 142 11.22 23 1.82 1 o.oe 225 17.77 7,500*9,999 35 2.78 138 10.90 28 2.21 201 1s.ea 10,000*14,999 87 5.29 150 11.85 20 1.58 237 IB,72 15,000*19,999 49 3.117 58 4.58 11 0.87 118 9.32 20,000*29,999 41 3.24 50 3.95 9 0.71 100 7.90 30,000*39,999 18 1.50 23 1.82 5 0,39 47 3.71 40,000*49,999 1 0.08 27 2.13 7 0.55 I 0.08 38 2.84 50 1000 PLUS 19 1.50 88 5.37 20 1.58 5 0.39 112 8.85 TOTAL 20 1.58 387 30.57 892 54.88 181 12.72 5 0.39 I 0.08 1286 100.00
JOINT OCCURRENCE OF DAllY HOl'TllOOO FLOWS AND TEMPERATURES, JUNE
- OCTOBER, 1997
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MONTH-JUNE * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HOlTWOOD DAllY AVG TEMl'ERATVA!
88 AND 80*89 70*79 80*85 GREATER TOT Al N PCTN N PCTN N 'CTN N PCTN N PCTN HOLTWOOD DAILY AVG Fl OW I0,000*14 1099 5 18.87 1 3.33 e 20.00 15,000*10,999 8 211.87 2 8.87 10 33.33 20 I 000* 29, 1100 3 10.00 4 19,33 7 23.33 30,000*39,999 3 10.00 3 10.00 40,000*49,999 2 8.87 2 11.87 50 1000 PLUS 2 8.87 2 8.117 TOTAL 10 33.33 12 40.00 1 23,33 1 3.33 30 100.00
JOINT OCCURRENCE OF OAILY HOLTWOOD FLOWS AHO TEMPERATURES, JUNE
- OCTOBER, 1997
- * * *. * * * *** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MONTHaJULY * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HOLTWOOD DAILY AYO TEMPERATURE 88 AND 80*85 OREATER TOTAL H
PCTN N PCTN N PCTN HOLTWDOO DAILY AVB FLOW 5,000*7,498 3 0.88 !I HI.IS 8 25.81 7,500*0,009 13 41.04 2 8.45 HI 48.30 10,000*1<4,11011 7 22.58 7 22.58 1!1,000*111,8118 1 S.23 t 3.23 TOTAL 24 77.42 7 22.!18 31 t00.00
JOINT OCCURRENCE OF DAILY HOLTWOOD FLOWS AllD TEMPERATURES, JUNE
- OCTOBER, 1997
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MONTH*AUGUST * * * * * * * * * * * * * * * * * *************************.*.************************
HOLTWOOD DAILY AVG TEMPERATURE 70*711 80*115 TOTAL N PCTN N PCTN N PCTN HOLTWOOO DAILY AVfJ l'LOW 2,500*4,099 II 19,35 8 111.35 5,000*7,4911 12 311.71 12 311.71 7,500*11,9119 !I 111.13 t 3.23 II 111.35 10,000*14,111111 3 11.1111 12.llO 7 22.58 TOTAL a 25,81 23 74.111 31 100.00
JOINT OCCURRENCE OF DAILY HOL lWOOD FLOWS AND TEMPERATURES, JUNE
- OCTOBER, 1997
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- llONTH*SEPTElllER * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HDLTWDOO DAILY AVG TEllPERATVllE 80*89 70*79 TOTAL H
PCTN N PCTN N PCTN HOL'IWOOD DAILY AVQ FLOW 5,000*7,~99 3 10.00 18 53.33 19 83.33 7,500*9,llllll e 20.00 e 20.00 10,000*14,9119 a 10.00 a 10.00 15,000*111,91111 2 8.87 2 8.87 TOTAL 3 10.00 27 90.00 30 100.00
JOINT OCCURRENCE OF DAILY HOLTWOOD FLOWS AHD TEMPERATURES, JUNE
- OCTOBER, 1997
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MONTH*OCTOllER * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HOLTM>OO DAILY AYO Tl!MPEllATUR!
50*50 110*89 TOTAL N PCTN N POTN H PCTN HOLTllt!OD DAILY AVG l'LOW 2,500*4,990 I 3.23 1 3.23 5,000*7,409 T 22.511 14 45.111 21 87.74 7,500*0,999 4 12.00 4 12.90 10,000*14,909 5 tll.H' 5 18.13 TOTAL 7 22.sa 24 77.42 31 100.00
JOINT OCCURRENCE OF DAILY HOLTWOOO FLOWS AND TEMPERATURES, JUNE
- OCTOBER, 1998
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MONTH-.JUNE * * * * * * * * * * * * * * * * * * * ** * *. * * * * ** * **** * * **** * * * * ** * * * * ** ** *.* * * * * * * * * * ***
HOLTWOOO DAILY AVG TEMPERATURE 110*119 70*79 80*85 TOTAL N PCTH H PCTN N PCTN H PCTH HOLTWOOO DAILY AVG FLOW 15,000*111,91111 5 18.117 3 10.00 8 211.117 20,000*211,999 2 e.111 5 111.117 5 111.117 12 40.00 30,D00*39,009 2 11.87 5 111.117 2 8.117 0 30.00 4D,000*49,1199 1 a.as 1 3.33 TOTAL 9 90.00 14 49.117 7 23.33 30 100.00
JOINT OCCURRENCE OF DAILY HOl.Tt/000 FLOWS AND TEMPERATURES, JUNE
- OCTOBER, 1998
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MONTH-JULY * * * * * * * * * * * * * * * * * * -* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -* * * * * * * * * * * * * * * * * * *
- HOLTWOOO DAILY AVG TEMPERATURE 70*7D 80-85 TOTAL N
PCTN N PCTN N PCTN HOLTWOOD DAILY AVQ FLOW 7,1500*11,9911 3 9.118 3 a.ea 10 1000*14 1D9D 10 32.28 10 32.28 15 1000*111 10911 I 3,23 1 a.211 2 11.-45 20 1000*20,DOO 8 1D.315 I 3.23 7 22.sa 30,000*311,0119 5 Ill. 13 I 3.23 8 111.35 40,000*411,1199 1 3.23 2 8.45 3 D.ae TOTAL ts 41.04 18 58.08 31 100.00
JOtNT OCCURRENC! OF DAILY HOLTWOOD FLOWS AND TEMPERATURES, JUNE
- OCTOOER, 1999
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- llONTH*AUOUST * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HOLTWOOD DAtLY AVO TEMl'ERATUR!
89 AND 70*711 80*85 GREATER TOTAL N l'CTN N l'CTN N PCTN H PCTN HOLTWOOO OAtLY AVO FLOW 5,000*7,489 1 3.23 18 51.91 2 e.45 19 81.211 7,500*11,11119 2 8.45 10 92.211 12 38,71 TOTAL 3 11,88 28 83.87 2 8.45 31 100.00
JOINT OCCURRENCE OF DAILY HOL '!'WOOD FLOWS AND TEMPERATURES 1 JUNE
- OCTOBER, 1998
- * * * ** * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- MONTH*SEPTEMBEll * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HOLTWOOD DAILY AVO TEMPERATURE 70*78 80*85 TOTAL N
PCTN N POTH N PCTN HOLTWOOD DAILY AVO 1'1.0W 2,!500*4,8811 18 53.33 2 e.e1 18 80.00 5,000*7,4811 8 20.00 8 20.00 12 40.00 TOTAL 22 73.33 8 28.87 30 100.00
JOINT OCCURRENCE OF DAILY HOLlWIX>O FLOWS AHO TEMPEJV.TUR!S, JUNE
- OCTOBER, 1998
- * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- UONTH*OCTOBEA * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
- HOLTWOOO DAILY AVG TEMPERATURE 50*59 110-110 70*78 TOTAL II PCTN N
l'CTN N PCTN " PCTH HOLTWOOO DAILY AVG FLOW 2,500*4,999 II 19.35 8 111.35 5,000*7,4911 3 9.88 8 25.81 11 35.48 7,&oO*ll,999 a 28.03 8 20.03 10,000*14,9110 5 111.13 5 111.13 TOTAL s 0.811 22 70.97 II 19.35 31 100.00
JOINT OCCURRENCE OF DAILY HOLTWOOD FLOWS AND TEMPERATURES, JUNE
- OCTOBER, 1999
- MONTH.:JUNE **************************************************
I HOLTWOOD I DAILY AVG TEMPERATURE 70*79 TOTAL N PCTN N PCTN HOLTWOOO DAILY AVG FLOW 2,500*4,999 5 16.67 5 16.67 5,000-7,499 16 53.33 18 53.33 7,500*9,999 8 20.00 8 20.00 10,000*14,999 3 10.00 3 10.00 TOTAL 30 100.00 30 100.00
JOINT OCCURRENCE OF DAILY HOLTVIOOO FLOWS AND TEMPERATURES, JUNE
- OCTOBER, 1999
- -************-------------*********** MONTH=JULY -*******************************************-*
I HOLTNOOD DAILY AVG TEMPE~ATUR~ 86 AND 70*79 80*85 GREATER TOTAL N PCTN N PCTN N PCTN N PCTN HOLTVIOOD DAILY AVG FLOW 2,500-4,999 1 3.23 15 48.39 16 51.61 s,ooo-7,499 1 3.23 11 35;48 1 3.23 13 41.94 7,500-9,999 1 3.23 1 3.23 2 6.45 TOTAL 3 9.68 27 87.10 1 3.23 31 100.00
JOINT OCCURRENCE OF DAILY HOLTWOOD FLOWS AND TEMPERATURES, JUNE
- OCTOBER, 1999
- UONTH=AUGUST *****************************-*******************
HOLTWOOD DAILY AVG TEMPERATURE 70*79 80*85 TOTAL N PCTN N PCTN N PCTN HOLTWOOD OAILV AVG FLOW 0*2,500 3 9.68 3 9.68 2,500*4,999 13 41.94 13 41.94 5,000-7,499 7 22.58 4 12.90 11 35.48 7,500*9,999 1 3.23 1 3.23 2 6.45 10,000-14,999 1 3.23 1 3.23 15,000*19,999 1 3.23 1 3.23 TOTAL 10 32.26 21 67.74 31 100.00
JOINT OCCURRENCE OF DAILY HOLTWOOD FLOWS AND TEMPERATURES, JUNE
- OCTOBER, 1999
- MONTH=SEPTEMBER ********************************************
HOLTWCiOD DAILY AVG TEMPERATURE 60-69 70-79 TOTAL N PCTN N. PCTN N PCTN HOLTWOOD DAILY AVG FLOW 2,500*4,999 6 20.00 6 20.00 5,000-7,499 3 10.00 3 10.00 7,500-9,999 1 3.33 1 3.33 10,000-14,999 2 6.67 2 6.67 15,000-19,999 4 13.33 1 3.33 5 16.67 20,000-29,999 5 16.67 1 3.33 6 20.00 30,000-39,999 2 6.67 1 3.33 3 10.00 40,000-49,999 1 3.33 1 3.33 50,000 PLUS 2 6.67 1 3.33 3 10.00 TOTAL 14 46.67 16 53.33 30 100.00
JOINT OCCURRENCE OF DAILY HOLTWOOO FLOWS AND TEMPERATURES, JUNE - OCTOBER, 1999
- -******--**************--**************---- MONTH=OCTOBER ---****--****-*****----------****-----*****-*****
HOLTWOOO DAILY.O.VG TEMPERATURE 50-59 60*69 TOTAL N PCTN N PCTN N PCTN HOLTWOOO DAILY AVG FLOW 7,500-9,999 1 3.23 1 3.23 10,000-14,999 10 32.26 10 32.26 15,000*19,999 5 16.13 4 12.90 9 29.03 20,000-29,999 1 3.23 1 22.58 8 25.81 30,000-39,999 2 6.45 2 6.45 40,000-49,999 1 3.23 1 3.23 TOTAL 17 54.84 14 45.16 31 100.00
January 7, 2019 U.S. Nuclear Regulatory Commission ENCLOSURE 4 04_NAl_201 Oa.pdf [NAI] Normandeau Associates, Inc. 201 Oa. "Data Report on Intake Screen Sampling at Peach Bottom Atomic Power Station in 2010." Prepared for Peach Bottom Atomic Power Station. December 2010.
DATA REPORT ON INTAKE SCREEN SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN2010 December 2010
DATA REPORT ON INTAKE SCREEN SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN 2010 Prepared for PEACH BOTTOM ATOMIC POWER STATION Delta, Pennsylvania 17314 Prepared by NORMANDEAU ASSOCIATES, INC. 1921 River Road Drumore, Pennsylvania 17518 Normandeau Associates' Project Number 20316. 003 December 2010
2010 Data Report on Intake Screen Sampling at the Peach Bottom Atomic Power Station
1.0 INTRODUCTION
Exelon's Peach Bottom Atomic Power Station (PBAPS) contracted Normandeau Associates, Inc. to conduct intake screen sampling during fall 2010. The data collection objective is two-fold: it fulfills Exelon's obligation to support the Susquehanna River's American shad restoration program as stated in the 2010 annual work plan and it provides juvenile American shad specimens to the Pennsylvania Fish and Boat Commission (PFBC) for otolith analysis, which compares the overall contribution of hatchery and wild fish. 2.0 METHODS Intake screen sampling was scheduled three days per week, (Monday, Wednesday, and Friday), with a two-person crew, from 25 October to 10 December, 2010. Nineteen of the 20 scheduled sampling events were conducted during the outmigration period. Sampling did not occur on 3 December, 2010 due to high river flows and constant automatic operation of the intake screens which prevented sampling due to lack of available bins that could be set aside for inspection. Normandeau personnel contacted PFBC personnel throughout the study period to keep them updated on collection/sampling activities. Peach Bottom control room personnel were contacted before and after each sampling event. The intake screens were operated on an as needed basis during the sample period. Peach Bottom personnel hoisted the bins out of the screen house to facilitate sampling and ensure the safety of the work crew. All fish observed in the bins (both Units 2 and 3) were identified and counted (if possible). In 2010, subsampling of certain species, (gizzard shad), due to large numbers or heavy debris loads occurred infrequently. Juvenile American shad that were suitable for analysis, (head and body intact), were counted, measured (total length in mm), and preserved (frozen) prior to delivery to PFBC personnel. 3.0 RESULTS A total of 14,692 fish of25 taxa, including crayfish, was collected; 5,726 from Unit 2 and 8,977 from Unit 3 (Table 1). Gizzard shad, (7,791), comprised 53%, while bluegill, (5,533), accounted for 37% of the total fish collected. Other species common in the remaining 10% of the collections were channel catfish, (602), alewife, (510), and green sunfish, (70). A total of 11 juvenile American shad were collected (Table 2); 6 collected at Unit 2 and 5 collected at Unit 3. Juvenile shad were collected throughout the sampling period with shad collected from Unit 2 on 29 October, 03, 15, and 19 November, and from Unit 3 on 01, 08, 10, 22 November, and 01 December. 4.0
SUMMARY
Intake screen sampling was conducted during the juvenile American shad outmigration period in Conowingo Pond. A total of 11 juvenile American shad were provided to the PFBC for otolith analysis and stock determination from the intake screen sampling. In addition to these 11 juvenile shad, only 7 additional shad, (2 from Conowingo strainer sampling, 4 from haul seining efforts upriver, and 1 while electrofishing in Lake Aldred) were collected during the fall outmigration period in 2010. A total of 510 alewife was also collected, and are believed to be a residualized population present in Conowingo pond as no alewife were observed passing through the Conowingo East fish lift in 2010. No blueback herring were collected during the 2010 sampling at Peach Bottom. PBAP~uvAm.9'la:l-Dec2010 Normaidea.I AS9Jciaes, Inc.
Table 1 Number of fish collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 25 October to 10 December 2010. S~ecies Unit 2 Unit3 Total American shad 6 5 11 Alewife 137 373 510 Blueback herring 0 0 0 Gizzard shad 2,849 4,942 7,791 Carp 0 2 2 Comely shiner 11 9 20 Spottail shiner 3 7 10 Spotfin shiner 5 5 10 Bluntnose minnow 2 3 5 Quill back 0 2 2 Shorthead redhorse 6 7 Channel catfish 137 465 602 Flathead catfish 2 3 5 White sucker 0 1 1 Rock bass 12 30 42 Green sunfish 20 50 70 White Perch 0 1 Bluegill 2,513 3,020 5,533 Largemouth bass 2 0 2 White crappie 3 18 21 Black crappie 0 3 3 Tessellated darter 10 22 32 Walleye 0 1 Yellow perch 0 2 2 Logperch 2 5 7 Crayfish 9 4 13 TOTAL 5,726 8,977 14,692 PBAPSjuvAm.shad -December2010 Normandeau Associates, Inc.
Table 2 Number of juvenile American shad collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 25 October to 10 December, 2010. Date Unit2 Unit3 Total 29 Oct OJ Nov 0 03 Nov 2 08 Nov 0 IONov 0 JS Nov 2 J9Nov 22 Nov 0 OJ Dec 0 TOTAL 6 PBAPSJwAm.shad-December 2010 0 J 0 0 0 5 2 2 11 Normandeau Associates, Inc.
January 7, 2019 U.S. Nuclear Regulatory Commission ENCLOSURE 5 05_NAl_2011a.pdf [NAI] Normandeau Associates, Inc. 2011 a. "Data Report or Intake Screen Sampling at Peach Bottom Atomic Power Station in 2011." Prepared for Peach Bottom Atomic Power Station. December 2011.
DATA REPORT ON INTAKE SCREEN SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN2011 December 2011
DATA REPORT ON INTAKE SCREEN SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN 2011 Prepared for PEACH BOTTOM ATOMIC POWER STATION Delta, Pennsylvania 17314 Prepared by NORMANDEAU ASSOCIATES, INC. 1921 River Road Drumore, Pennsylvania 17518 Normandeau Associates' Project Number 20316.003 December 2011
2011 Data Report on Intake Screen Sampling at the Peach Bottom Atomic Power Station
1.0 INTRODUCTION
Exelon's Peach Bottom Atomic Power Station (PBAPS) contracted Normandeau Associates, Inc. to conduct intake screen sampling during fall 2011. The data collection objective is two-fold: it fulfills Exelon's obligation to support the Susquehanna River's American shad restoration program as stated in the 2011 annual work plan and it provides juvenile American shad specimens to the Pennsylvania Fish and Boat Commission (PFBC) for otolith analysis, which compares the overall contribution of hatchery and wild fish. 2.0 METHODS Intake screen sampling was originally scheduled three days per week, (Monday, Wednesday, and Friday), with a two-person crew, from 24 October to 2 December, 2011. Nine of the 17 scheduled sampling events were cancelled due to maintenance activities at the outer screen house during the juvenile American shad outgration period. Normandeau personnel contacted PFBC personnel throughout the study period to keep them updated on collection/sampling activities. Peach Bottom control room personnel were contacted before and after each sampling event. The intake screens were operated on an as needed basis during the sample period. Peach Bottom personnel hoisted the bins out of the screen house to facilitate sampling and ensure the safety of the work crew. All fish observed in the bins (both Units 2 and 3) were identified and counted (if possible). In 2011, subsampling of certain species, (gizzard shad), due to large numbers or heavy debris loads did not occur. Juvenile American shad that were suitable for analysis, (head and body intact), were counted, measured (total length in mm), and preserved (frozen) prior to delivery to PFBC personnel. 3.0 RESULTS A total of 5,738 fish of23 taxa was collected; 2,591 from Unit 2 and 3,147 from Unit 3 (Table 1). Gizzard shad (3,111) and bluegill (2,411) comprised 96% of the total while all other species combined accounted for 4% of the total fish collected. Other species common in the collections were channel catfish (69), and comely shiner (37). No juvenile American shad were collected at Peach Bottom in 2011, (Table 2). 4.0
SUMMARY
Intake screen sampling was conducted during a portion of the juvenile American shad outmigration period in Conowingo Pond. The 2011 outmigration period may have occurred earlier due to heavy rainfall events in September from the remnants of Hurricane Irene and Tropical storm Lee. The extremely high river flows that occurred due to these rain events may have forced juvenile American shad to leave the Susquehanna River prematurely in 2011. No juvenile American shad were collected or provided to the PFBC from sampling activities at the PBAPS in 2011. PBAP~ uvAm. sha:l-Dec 2011 Normaidea.J AS&>Ci ates, Inc.
Table 1 Number offish collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 2 November to 2 December 2011. Species Unit2 Unit3 Total Alewife 9 16 25 American shad 0 0 0 Gizzard shad l, 117 1,994 3,111 Gold fish 0 1 Comely shiner 15 22 37 Spottail shiner 0 1 Spotfin shiner 8 5 13 Fathead minnow 0 1 Golden shiner 2 3 Shorthead redhorse 0 3 3 Channel catfish 28 41 69 Flathead catfish 8 5 13 Tiger muskie 0 1 Rock bass 5 6 Green sunfish 2 3 Pumpkinseed 0 1 Bluegill 1,394 1,017 2,411 Redbreast sunfish 2 4 6 Largemouth bass 2 10 12 White crappie 2 12 14 Black crappie 0 2 2 Tessellated darter 0 1 Yell ow perch 0 3 3 Logperch 0 1 TOTAL 2,591 3,147 5,738 PBAPSjuvAm.shad -December2011 Normandeau Associates, Inc.
Table 2 Number of juvenile American shad collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 2 November to 2 December, 2011. Date Unit 2 UnitJ Total 2 November - 2 December 0 0 0 TOTAL 0 0 0 PBAPSjuvAm.shad-Oecembor 2011 Normandeau Assoc/ates, Inc.
January 7, 2019 U.S. Nuclear Regulatory Commission ENCLOSURE 6 06_NAl_2012a.pdf [NAI] Normandeau Associates, Inc. 2012a. "Data Report or Intake Screen Sampling at Peach Bottom Atomic Power Station in 2012." Prepared for Peach Bottom Atomic Power Station. December 2012.
DATA REPORT ON INTAKE SCREEN SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN 2012 December 2012
DATA REPORT ON INTAKE SCREEN SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN 2012 Prepared for PEACH BOTTOM ATOMIC POWER STATION Delta, Pennsylvania 17314 Prepared by NORMANDEAU ASSOCIATES, INC. 1921 River Road Drumore, Pennsylvania 17518 Normandeau Associates' Project Number 203 I 6.003 December 2012
2012 Data Reporl on Intake Screen Sampling at the Peach Bottom Atomic Power Station
1.0 INTRODUCTION
Exelon's Peach Bottom Atomic Power Station (PBAPS) contracted Normandeau Associates, Inc. to conduct intake screen sampling during fall 2012. The data collection objective is two-fold: it fulfills Exelon's obligation to support the Susquehanna River's American shad restoration program as stated in the 2012 annual work plan and it provides juvenile American shad specimens to the Pennsylvania Fish and Boat Commission (PFBC) for otolith analysis, which compares the overall contribution of hatchery and wild fish. 2.0 METHODS Intake screen sampling was originally scheduled three days per week, (Monday, Wednesday, and Friday), with a two-person crew, from 29 October to 7 December, 2012. Two of the 17 scheduled sampling events (29 and 31 October) were cancelled due to poor/unsafe weather conditions resulting from Hurricane Sandy. Maintenance activities at the outer screen house on 7 November resulted in cancellation of sampling for that day. During the juvenile American shad outmigration period, Normandeau personnel communicated with PFBC to keep them updated on collection/sampling activities. Peach Bottom control room personnel were contacted before and after each sampling event. The intake screens were operated on an as needed basis during the sample period. Peach Bottom personnel hoisted the bins out of the screen house to facilitate sampling and ensure the safety of the work crew. All fish observed in the bins (both Units 2 and 3) were identified and counted (if possible). In 2012, subsampling of certain species, (gizzard shad and bluegill), occurred when large numbers of fish or heavy debris loads were present in the sampling bins. Juvenile American shad that were suitable for analysis, (head and body intact), were counted, measured (total length in mm), and preserved (frozen) prior to delivery to PFBC personnel. 3.0 RESULTS A total of 108,004 fish of29 taxa was collected; 23,588 from Unit 2 and 84,416 from Unit 3 (Table 1 ). Gizzard shad (78,528) and bluegill (28, 147) comprised nearly 99% of the total while all other species combined accounted for 1 % of the total fish collected. Other species common in the collections were alewife (683), channel catfish (129), and green sunfish (101). A total of29 juvenile American shad (Unit 2 = 10; Unit 3 = 19) were collected at Peach Bottom in 2012, (Table 2). 4.0
SUMMARY
Intake screen sampling was conducted during the peak of the juvenile American shad outmigration period in Conowingo Pond. The 2012 outmigration period may have been influenced by the occurrence of Hurricane Sandy in late October, 2012 as collection of 28 of the 29 juvenile American shad at Peach Bottom occurred on 2 and 5 November. The increase to river flow that occurred from this rain event may have triggered the outmigration of juvenile American shad to occur in a relatively narrow time period in 2012. Twenty-nine juvenile American shad were collected and provided to the PFBC from sampling activities at the PBAPS in 2012. PBAP~uvAm. sha:l-Dec2012 Normaidea.t AS50Ciaes, Inc.
Table 1 Number of fish collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 2 November to 7 December 2012. S(!ecies Unit2 Unit3 Total Alewife 427 256 683 American shad 10 19 29 Gizzard shad 16,399 62,129 78,528 Carp 4 28 32 Quill back 1 3 4 White sucker 0 1 1 Comely shiner 21 33 54 Spottail shiner 6 15 21 Spotfin shiner 4 21 25 Bluntnose minnow 1 2 3 Golden shiner 0 3 3 Fall fish 0 4 4 Banded killifish 0 1 Shorthead redhorse 1 1 2 Channel catfish 66 63 129 Flathead catfish 15 23 38 White perch 4 3 7 Rock bass 4 13 17 Green sunfish 8 93 101 Pumpkinseed 7 45 52 Bluegill 6,580 21,567 28,147 Smallmouth bass 2 5 7 Largemouth bass 4 30 34 White crappie 0 11 11 Black crappie 0 2 2 Tessellated darter 16 14 30 Yell ow perch 2 7 9 ------ - Walleye 0 1 Logperch 6 23 29 TOTAL 23,588 84,416 108,004 PBAPSjuvAm.shad -December2012 Normandeau Associates, Inc.
Table 2 Number of juvenile American shad collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 2 November to 7 December, 2012. Date Unit2 UnitJ Total 02 Nov 9 17 26 05 Nov 0 2 2 19Nov I 0 TOTAL JO 19 29 PBAPSJuvAm.shad-Oecember 2012 Normandeau As.ac/alas, Inc.
January 7, 2019 U.S. Nuclear Regulatory Commission ENCLOSURE 7 07_NAl_2013a.pdf [NAI] Normandeau Associates, Inc. 2013a. "Data Report or Intake Screen Sampling at Peach Bottom Atomic Power Station in 2013." Prepared for Peach Bottom Atomic Power Station. December 2013.
DATA REPORT ON INTAKE SCREEN SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN 2013 December 2013
DATA REPORT ON INTAKE SCREEN SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN 2013 Prepared for PEACH BOTTOM ATOMIC POWER STATION Delta, Pennsylvania 17314 Prepared by NORMANDEAU ASSOCIATES, INC. 1921 River Road Drumore, Pennsylvania 17 518 Normandeau Associates' Project Number 20316. 003 December 2013
2013 Data Report on Intake Screen Sampling at the Peach Bottom Atomic Power Station
1.0 INTRODUCTION
Normandeau Associates, Inc. (Normandeau) was contracted by Exelon Corporation to conduct intake screen sampling at their Peach Bottom Atomic Power Station (PBAPS) during fall 2013. The study objective was two-fold: it fulfills Exelon's obligation to support the Susquehanna River's American shad restoration program as stated in the 2013 annual work plan, and it provides juvenile American shad specimens to the Pennsylvania Fish and Boat Commission (PFBC) for otolith analysis, which compares the overall contribution of hatchery and wild fish to the population. 2.0 METHODS Intake screen sampling was scheduled to occur three days per week, (Monday, Wednesday, and Friday), with a two-person crew, from 4 November to 6 December 2013 (except for Friday, 29 November). A total of 14 sampling events was conducted at the outer screen house during the juvenile American shad outmigration period. Normandeau personnel contacted PFBC personnel throughout the study period to keep them updated on collection/sampling activities. Peach Bottom control room personnel were contacted before and after each sampling event. The intake screens were operated on an as needed basis during the sample period, and for a minimum of 30 minutes prior to each trash bin being pulled from the collection pit and the contents available for sampling. Peach Bottom personnel hoisted the trash bins out of the screen house to facilitate sampling and ensure the safety of the work crew. All fish observed in the trash bins (both Units 2 and
- 3) were identified and counted (if possible). In 2013, sub-sampling of certain species, (gizzard shad),
was necessary due to large numbers or heavy debris loads which occurred infrequently throughout the study period. Juvenile American shad that were suitable for analysis, (head and body intact), were counted, measured (nearest mm total length), and preserved (frozen) prior to delivery to PFBC personnel. 3.0 RESULTS A total of20,062 fish of25 taxa was collected; 10,058 from Unit 2 and 10,004 from Unit 3 (Table 1). Gizzard shad (13,989) and bluegill (5,693) comprised 98% of the total, while all other species combined accounted for 2% of the total fish collected. Other species common in the collections were channel catfish (154), carp (55) and American shad (49). A total of 49 American shad was collected during the fall 2013 sampling at the PBAPS. American shad were collected on 12 of the 14 scheduled sampling events; American shad were not collected on December 4 and 6 (Table 2). All juvenile American shad collected were provided to the PFBC for otolith analysis. 4.0
SUMMARY
Intake screen sampling was conducted during the main portion of the juvenile American shad outmigration period in Conowingo Pond. No sampling occurred in October 2013 due to a refueling outage at the PBAPS. At this time, it is uncertain when these juvenile shad may have moved downstream into Conowingo Pond. A weekly haul seine project conducted by Normandeau for the PFBC in the vicinity of City Island (Harrisburg, PA) and Columbia, PA from mid-July through October 2013 resulted in one juvenile American shad collected at Columbia on 12 August 2013. Relatively stable river flows occurred throughout the sampling period with no discernible freshets which would move fish downstream. The 49 American shad collected in 2013 was nearly double that collected in 2012. A total of 49 juvenile American shad was collected and provided to the PFBC from sampling activities at the PBAPS in 2013. PBAP~uvAm.sha::l-Dec 2013 N ormaidea.J A ss:x:i ates, I nc.
Table 1 Number of fish collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 4 November to 6 December 2013. S~ecies Unit2 Unit3 Total American eel 0 3 3 American shad 21 28 49 Gizzard shad 7,152 6,837 13,989 Carp 27 28 55 Golden shiner 0 1 Comely shiner 13 12 25 Spottail shiner 1 2 Spotfin shiner 0 2 2 Bluntnose minnow 3 0 3 Shorthead redhorse 0 1 Channel catfish 125 29 154 Flathead catfish 7 5 12 Banded killifish 7 3 10 White perch 0 1 Rock bass 1 2 3 Redbreast sunfish 0 1 1 Green sunfish 12 9 21 Bluegill 2,669 3,024 5,693 Smallmouth bass 0 1 Largemouth bass 9 11 20 White crappie 0 3 3 Black crappie 5 4 9 Tessellated darter 2 Logperch 0 1 Greenside darter 0 1 TOTAL 10,058 10,004 20,062 PBAPSjuvAm.shad -December2013 Normandeau Associates, Inc.
Table 2 Number of juvenile American shad collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 4 November to 6 December, 2013. Date Unit2 UnitJ Total 04 Nov I 0 06 Nov 6 10 16 08 Nov I 2 11 Nov 0 2 2 13 Nov 2 3 15 Nov 2 0 2 18 Nov 0 1 20Nov 2 4 6 22 Nov 0 25 Nov 4 3 7 27Nov 3 3 6 02 Dec 0 2 2 TOTAL 21 28 49 PBAPSjuvAm shad-Oecember 2013 Normandeau Assoc/alas, Int:.
January 7, 2019 U.S. Nuclear Regulatory Commission ENCLOSURE 8 08_NAl_2013b_REDACTED.pdf [NAI] Normandeau Associates, Inc. 2013b. "Peach Bottom Atomic Power Station Entrainment Characterization Study 2012." Prepared for Exelon Generation. February 2013.
PEACH BOTTOM ATOMIC POWER STATION ENTRAINMENT CHARACTERIZATION STUDY 2012 REDACTED VERSION January 2019 Prepared for: A ,. " Exelon Generation By: Normandeau Associates, Inc. February 2013
Table of Contents INTR.ODUCTION.............................................................................................................. I THE STATION................................................................................................................... I COOLING w ATER SYSTEM............................................................................................... 2 ME1HODS......................................................................................................................... 2 SAMPLING LOCATION AND FREQUENCY........................................................................... 2 SAMPLE COLLECTION METHOD........................................................................................ 3 SAMPLE PROCESSING AND TAXONOMY............................................................................ 5 QUALITY ASSURANCE AND CONTROL........................................... *********************************** 5 RESULTS............... :................... '........................................................................................ 6 w ATER QUALITY AND RIVER DISCHARGE ****************************************************................... 6 ENTRAINMENT SAMPLE w ATER QUALITY *********************************************************************** 6 ENTRAINlvIBNT OF lCHTHYOPLANKTON.............................. ~............................................. 6 DESCRIPTION OF ENTRAINMENT OF COMMON SPECIES.................................................... 8 DISCUSSION AND CONCLUSIONS.............................................................................. 9 SPAWNING ATTRIBUTES OF SELECTED SPECIES............................................................. 10 COMPARISON TO PREVIOUS ENTRAINMENT STUDY AT PBAPS....................................... 12 SPECIES OF SPECIAL CONCERN.:..................................................................................... 13 REFERENCES................................................................................................................. 13 List of Figures Figure 1. Map ofConowingo Reservoir showing locations of Peach Bottom Atomic Power Station and other power plants. REDACTED Figure 2. Peach Bottom Atomic Power Station cooling water intakes and discharge structures. REDACTED Figure 3. Entrainment characterization study sampling locations at PBAPS during 2012. Figure 4. Water temperature measured at the PBAPS outer intake screens, March to October 2012. Figure 5. Susquehanna River discharge measured at Holtwood Hydroelectric Facility, March to September 2012. Figure 6. Total number offish collected in entrainment samples at PBAPS, March 8 to September 27 2012. PBAPS Entrainment Study Report Rev. o, February 2013
Figure 7. Length-frequency distribution of fishes collected in entrainment samples at PBAPS, March 8 to September 27 2012. Excludes one American eel (TL=128 mm) Figure 8. Number of tessellated darter collected in each entrainment sample through time at the PBAPS discharge structure* outfall during 2012. Figure 9. Number of gizzard shad collected in each entrainment sample through time at the PBAPS discharge structure outfall during 2012. List of Tables Table 1. Total number and percent composition offish collected in entrainment samples at the PBAPS discharge structure outfall, March 8 to September 27 2012. Table 2. Total number of each taxon and life stage collected in entrainment samples at the PBAPS discharge structure outfall, March 8 to September 27 2012. Table 3. Number of each taxon collected in entraifirnent samples during each time interval at PBAPS, March 8 to September 27 2012. Table 4. Descriptive statistics for total length of fishes collected in entrainment samples from PBAPS discharge structure outfall, March 8 to Septerpber 27 20*12. Table 5. Total number and percent composition of fishes collected in Conowingo Pond using electrofisher, seine, and trawl during 2010 and 2011. Table 6. Mean densities of larval fishes collected with a towed plankton net within the PBAPS intake ponds during 1975 and 1976. Table 7. Mean density of each taxon collected during weekly entrainment sample collections at PBAPS discharge outfall, March 8 to September 27 2012. Table 8. Mean density of each taxon in entrainment sample collections at PBAPS discharge outfall, Mar~h 5 to September 27 2012. Appendices Appendix A. Work Plan for an Entrainment Characterization Study at Peach Bottom Atomic Power Station Appendix B. Scientific and common names of fishes collected in Conowingo Pond. ii PBAPS Entrainment Study Report Rev. O, February 2013
INTRODUCTION This report presents the results of an entrainment characterization study conducted by Normandeau Associates, Inc. at the Peach Bottom Atomic Power Station (PBAPS). The entrainment characterization study was completed based on a work plan that was reviewed and accepted by the Pennsylvania Department of Environmental Protection (PA DEP). The primary objective of the entrainment study was to identify and quantify the densities of the ichthyoplankton (fish eggs and larvae) entrained through the PBAPS. Peach Bottom Atomic Power Station currently operates under NPDES Permit No. PA 0009733 which was issued November 30, 2010 with an effective date of January 1, 2011. The permit contains a requirement for an entrainment characterization study to be conducted over at least one fish spawning season as described.in the permit within Part C. section II.D.1 as follows: I. Within 90 days of permit issuance, The Permittee shall submit a Work Plan to conduct entrainment sampling (see Section 2 below) of the non-contact cooling water inn~r intake structure at the Peach Bottom Atomic Power Station ("Facility"). The Permittee shall respond to the Department's comments on the Work Plan within 30 days of receipt. Startup of the sampling program shall occur at the beginning of the next fish spawning season following receipt of written Department approval of the Work Plan, or an alternate schedule approved by the Department, in writing.
- 2. The Work Plan shall include a detailed proposal for the following entrainment sampling of fish eggs and larvae.
a) Entrainment data collections shall occur for a period of at least one fish spawning season, approximately March through September, at a sampling frequency sufficient to characterize the entrainment occurring. b) Voucher specimens of two (or one if only one is available) Chesapeake logperch (Percina bimaculata) and federal and state threatened, endangered and candidate fish species collected shall be retained and catalogued. The Department along with the appropriate state and federal authorities shall be notified w'ithin. 24-hours if any federal or state threatened, endangered, or candidate fish species are identified. c) Entrainment data collection shall be performed by qualified consultants and/or trained professionals with the skills and knowledge appropriate for producing valid samples and evaluations under a formal QA/QC plan. The Station PBAPS is located in York County, Pennsylvania, on the west shore of Conowingo Reservoir (Pond), approximately 3 miles upstream from the Pennsylvania-Maryland border (Figure 1). PBAPS is a two-unit nuclear-fueled power generating facility with a nominal generating capacity of 2,304 megawatts electrical (MWe). The Station operates 1 PBAPS Entrainment Study Report Rev. 0, February 2013
as a base-load facility with both units normally generating at full capacity. Unit 2 began commercial operation in June 1974 and Unit 3 entered commercial service in December 1974. Conowingo Pond was formed in 1928 with the construction of Conowingo Hydroelectric Station. Cooling Water System PBAPS utilizes a once-through cooling system to remove waste heat from the station's condensers. The cooling water for both units is withdrawn from the Pond through an outer intake structure located on the shoreline of Conowingo Pond, through two 3-acre intake ponds (one serving each unit), and then through an inner intake structure as shown in Figure 2. Conowingo Pond refers to the portion of the Susquehanna River impounded by the Conowingo Darn; the boundaries of the Pond extend from the base of.Holtwood Darn downstream to Conowingo Darn. The outer intake is approximately 480 ft long with a fixed vertical trash rack on the face of the intake followed by a set of 24 vertical traveling screens which have 3/8-inch mesh openings. The trash rack consists of 0.25-inch by 3-inch steel bars spaced 3.5 inches on center and is designed to prevent large debris and ice from entering the intake. The trash rack is cleaned periodically per a preventative maintenance program. After passing through the outer intake, the cooling water flows through the intake ponds to the inner intake. Fish live and grow in the ponds and can enter the ponds through the outer screens when they are small, by being carried over the screens if they are not removed during the screen cleaning process, and through the cross-tie gate from the discharge canal in winter. During cold weather and on an as-needed basis, a cross-tie gate between the discharge basin and the intake ponds is opened to re-circulate some of the heated discharge water. At the inner intake, water enters the pumphouse through eight screen.bays. Two bays are devoted to service water flows and six convey water to the circulating water pumps. Water flowing to the circulating water pumps is screened by 3/8-inch mesh dual-flow, or dual-entry single-exit, traveling screens. Approximately 47 ft downstream from the screens, there are six circulating water pumps, three per unit, each with a capacity of about 361 MGD (250,880 gpm) for a facility total of 2,168 MGD (3,360 cfs). The water travels from the circulating water pumps and then passes through the condensers and is discharged into a common basin (Figure 2). From the common basin the discharge flows down a 4, 700-ft long canal to the Conowingo Pond. METHODS Sampling Location and Frequency Entrainment sampling was conducted at the circulating water discharge outfall for Units 2 and 3, not at the inner circulating water intake structure as stated in the NPDES permit. 2 PBAPS Entrainment Study Report Rev. 0, February 2013
Exelon had serious plant safety concerns regarding maintaining the integrity of the nuclear plant's water supply and would not allow the sampling equipment to be installed within the inner intake structure. As discussed in EPRI (2005), sampling in the power plant discharge actually has advantages over sampling at the intake, such as: Certainty that all organisms collected were actually entrained and Turbulence reduces potential bias resulting from non-random vertical distribution of entrained organisms. The sampling frequency of the entrairunent characterization study was based on guidance provided by the Electric Power Research Institute (EPRI) in Entrainment Abundance Monitoring Technical Support Document (EPRI 2005) and based on similar PA DEP-approved entrainment studies conducted recently by Normandeau Associates, Inc. (Normandeau) at other generating stations in Pennsylvani~ (Normandeau 2008a, 2008b). Entrainment sampling was performed over one 24-hour sampling event each week from March through September 2012. The weekly sampling event was scheduled for approximately the same day each week to ensure regular spacing of the events. If either planned or unanticipated events interfered with this schedule, the sampling interval was adjusted one or more days. If the circulating water pumps of both Unit 2 and Unit 3 were not operable for an extended period (i.e., for several days during a week), the sampling was not completed. As long as one unit was operating,.the sampling was completed. Sampling was performed by trained personnel from Normandeau operating under an approved sampling protocol. Sample Collection Method The samples were collected with a 3-inch electric pump that obtained the sample water through a 3-inch diameter pipe positioned vertically in the discharge basin as close as feasible to the discharge structure outfall. The pump was located on the bank of the discharge basin with the suction line leading to the sampling pipe which was attached to a rock-filled structure at the discharge outfall (Figure 3). Samples were obtained from mid-depth in the water column through a 90-degree elbow* or "I facing into the discharge current. Total target volume of each pumped sample was approximately 100 cubic meters (28,000 gallons). The suction line conveyed the sample water to the sampling pump and then through a calibrated in-line flow meter. The electric pump had a pumping rate of approximately 150 gallons per minute.as measured by the in-line flow meter. This flow rate was approximately 0.6 cubic meters per minute. Thus, a total of approximately 3 hours of pumping was completed to obtain a single sample of approximately 100 m3* One sample was collected every 6 hours for each weekly 24-hour sampling event. From the pump the sample was discharged through a 4-inch pipe into a plankton net constructed of 500-micron mesh and suspended in a large tank of water. The velocity of water exiting the hose was thereby reduced greatly before encountering the mesh of the net. The lower velocity reduced potential damage to the eggs and larval fish specimens. 3 PBAPS Entrainment Study Report Rev. 0, February 2013
The 500-micron mesh net is fine enough to capture the eggs and larvae of all fishes likely to be encountered at PBAPS. The contents of the plankton net were rinsed down from the outside with ambient water and carefully transferred to sample containers. The samples were immediately preserved with 10 percent buffered formalin, labeled (both inside and out) and s~nt to Normandeau's laboratory for analysis. The sample was acceptable if all of the following conditions were met: A minimum sample volume of approximately 100 m3 was collected, unless this volume was impractical to achieve due to clogging, pumping problems, etc., The net was not torn, The flowmeter was not physically damaged, None of the ichthyoplankton sample was lost or spilled during the net rinse down and sample transfer steps. For each sample the following information was recorded: Volume of water filtered, Intake water temperature, dissolved oxygen, and pH at the start of each sample, Date and time of the day atthe start and end of each sample, Identification of the circulating water and other major pumps in operation at the start and end of each 24-hour sampling event, Names of the sample collectors, and Any deviations from the sampling protocol, unusual conditions, or other pertinent observations. Mechanical issues occurred with the entrainment collection system from April 5 to May
- 2. Specifically, part of the entrainment collection system piping which was attached to the rock-filled structure (stand pipe) was damaged during the study period. The turbulent flows created from the Unit 2 and 3 discharge cracked the stand pipe and resulted in complete loss of suction and rendered the collectfon system inoperable. This resulted in the need to complete alternative sampling while a new stand pipe was being fabricated and installed. Alternative entrainment sampling was completed to ensure a complete data record during the course of the study period. The alternative sampling method was completed by suspending a 1-m diameter plankton net from the road bridge at the head of the discharge canal (Figure 3 ). The net was lowered approximately 2-4 feet below the water surface into the discharge canal and a sample was collected. A General Oceanics Mechanical Flowmeter was mounted in the mouth of the net and used to record the volume of water sampled. The alternative method yielded four samples; two collections during the day and two at night. Each sample was collected over an approximately 20-minute period with a target sample volume of l 00 m3*
4 PBAPS Entrainment Study Report Rev. 0, February 2013
Sample Processing and Taxonomy All samples were processed in entirety for ichthyoplankton (eggs and larvae), juvenile, and adult fish. Samples were sorted under magnification to ensure that all organisms were removed. The specimens were removed from the samples, identified to the lowest taxonomic category practicable (generally species), and counted. Larvae and juveniles were categorized by lifestage into prolarvae (yolk-sac larvae), postlarvae (post yolk-sac larvae), young-of-the-year (YOY), yearling or older, and unknown. The unknown life stage indicated that the larvae were damaged or the life stage could not be determined. The unknown life stage larvae were either prolarvae or postlarvae. The separation of these two life stages can be difficult if the specimens are damaged. For each sample a maximum of 20 individuals for each species and life stage category was measured for total length to the nearest 0.1 mm (nearest 1.0 mm for juvenile fish). All ichthyoplankton specimens were retained for the duration of the study. If any Federal or Pennsylvania endangered, threatened, or candidate fish species were collected, the appropriate Federal and state authorities were to be notified within 24 hours of making a confirmed identification of any of these important species. Specimens of the genus Percina were to be retained for transfer to the PA DEP at a later date. In situ water quality measurements were collected :from the PBAPS discharge canal. A calibrated YSI Sonde was used to determine water temperature, pH, and dissolved oxygen prior to and after the collection of each entrainment sample. In addition, water temperature monitoring at the PBAPS outer intake structure was completed concurrently for another study (Normandeau 2013). Water temperature was recorded using an Onset HOBO Pro v2 water temperature data logger which recorded water temperature every 15 minutes. Discharge records for Holtwood Hydroelectric Facility were also included to characterize flows entering Conowingo Pond. Holtwood Dam is located approximately 6 miles upstream :from the PBAPS intake. Fish entrainment density was calculated for each week of sampling. These estimates were based upon the mean density of each taxon which was calculated from the density observed in each of the four entrainment samples collected during each week. Density was calculated by dividing the actual number of each taxon in a sample by the volume of water filtered through the sampling net. Mean density for each week was determined by summing the density of each taxon in the four samples and dividing by four. Estimated density for each tax.on was also determined for the entire study period. This overall density was determined by summing the density of each taxon observed in a sample and dividing by the total number of samples collected. Quality Assurance and Control Entrainment sampling was performed by trained individuals from Normandeau working under a standard operating procedure and quality assurance plan developed for the entrainment study. Field instruments were calibrated prior to each sampling event 5 PBAPS Entrainment Study Report Rev. 0, February 2013 *
~
according to the manufacturer's specifications. Laboratory processing and identification were performed by Normandeau's trained technicians and experienced taxonomists, respectively, operating under a formal QA/QC plan. RESULTS Water Quality and River Discharge Daily mean water temperature measured at the PBAPS intake during the entrainment sampling program ranged from 12.l to 30.7 °C (Figure 4). Water temperature during the start of the study was cool, actually decreasing slightly during the end of March. During April water temperature increased gradually and then co*oled slightly toward the end of the month. From May onward water temperatures gradually increased reaching the highest temperatures in mid-July. Temperatures gradually decreased from mid-July to the end of the study period. Water temperatures were coolest in March and April and wannest during July. Susquehanna River discharge data was available from the Holtwood Hydroelectric Facility. River discharge during the entrainment sampling period ranged from 5,900 to 107,300 cubic feet per second (cfs) with mean flow of 24,945 cfs. Flows were highest during March and May to mid-June, then relatively low throughout the end of the study period (Figure 5). The highest daily mean discharge of 107,300 cfs was recorded on May
- 17.
Entrainment Sample Water Quality Measurements of water temperature, dissolved oxygen (DO), and pH were recorded for the PBAPS discharge outfall during the course of the entrainment sampling program. Water temperature in the discharge ranged from 20.7 to 41.1 °C with mean of 32.4 °C. Temperatures in the discharge canal followed a similar trend to that of the ambient Pond temperatures measured at the* PBAPS intake structure (Figure 4 ). Water pH during the study ranged from 7.1 to 8.9 with mean of 8.1. Dissolved oxygen in the discharge water ranged fyom 5.0 to 13.6 milligrams per liter (mg/I) with mean of 8.3 mg/I. Entrainment of lchthyoplankton A total of 112 entrainment samples were collected from March 8 to September 27, 2012 over the 30-week sampling period. Samples collected with the 3-inch pump accounted for 88 of the collected entrainment samples. Four samples were collected during each 24-hr sampling event each week. The first sample each week was collected between 06:00-12:00hrs with subsequent samples collected approximately 6 hours later, between 12:00-l 8:00hrs, 18:00-00:00hrs, and 00:00-06:00lirs. Water volumes for these samples ranged from 102 to 130 m3 with mean of 106 m3. Twenty-four samples were collected using the alternative sampling method. Most of the alternative method samples were collected from April 5 to May 2 with two samples collected in June and four samples collected in August Four 20-minute samples were 6 PBAPS Entrainment Study Report Rev. 0, February 2013
collected during each 24-hr sampling event. The first two samples were collected between 06:00-12:00 hrs and the remaining two samples were collected between 18:00-00:00 hrs. Water volumes for the alternative samples ranged from 57 to 193 m3 with mean of 123 m3* For both collection methods a total of 6,562,430 gallons (24,841m 3 ) of water was sampled during the entire study period. Ten species were represented by. the 1,529 fish eggs and larvae collected in the 112 samples (Table 1). Gizzard shad (76.0%) was the most numerically abundant taxon. Other common species include tessellated darter (7.8%), banded darter (1.2%), and channel catfish (0.7%). A total of 12.2% of the larval fishes that were collected were not identifiable because of damage to the larvae as a result of being transported through the PBAPS cooling water system or through the entrainment sampling system. Most of the 1,440 larval fish collected were yolk-sac larvae, post yolk-sac larvae, or unknown (either yolk-sac or post yolk-sac larvae) life stage (Table 2). A majority (50.0%) of the entrained fishes were unknown life stage (either yolk-sac or post-yolk sac larvae). Yolk-sac larvae and post yolk-sac larvae were also abundant, comprising 22.2 and 22.0% of all individuals, respectively. A total of 74 fish eggs were collected which accounted for 4.8% of entrained organisms. Only 13 YOY and two yearling and older fishes were collected. Temporal variation in fish entrainment was evident with a majority of the fish being collected from April 18 to July 27 (Figure 6). Only one fish was collected in March (spottail shiner) and only three fish were collected during August and September. The largest entrainment sample collections occurred on April 25 and May 30 when 375 and 350 fish were collected, respectively. Most fish were collected during nighttime hours with 36% collected between 18:00-00:00 hrs (Table 3). Of the entrained fish, 284 were measured for total length. A majority of these were gizzard shad, tessellated darter, and banded darter (Table 4). Mean length for entrained fish was 6.5 mm (standard deviatio~ of 3.4 mm). Most of the entrained fish ranged in total length from 3 to 9 mm (Figure 4). The overall length range for entrained fish was between 3 mm (gizzard shad) and 128 mm (American eel) (Table 4). 7 PBAPS Entrainment Study Report Rev. 0, February 2013
Description of Entrainment of Common Species Banded darter A total of 19 banded darter was collected in entrainment samples. All coJlected individuals were either yolk-sac or post yolk-sac larvae. Banded darter was collected from April 19 to August 1, with most of the individuals being collected in May 8. Mean entrainment density of banded darter over the study period was 1.59/1000m3 with maximum density of 21.9 occurring in week 10. Mean total length of banded darter was 7.6 mm with range between 6 and 10 mm. Channel catfish A total of 11 channel catfish was collected in the entrainment samples. Eight YOY and three post yolk-sac larvae were collected from June 14 to July 6. Entrainment density of channel catfish for the sample period was 0.92/1000m3 with a maximum density of 14.7/1000m3 during week 16. Mean total length of channel catfish was 15.5 mm and ranged between 14.5 and 17 mm. Gizzard shad Gizzard shad was the most abundant fish in entrainment samples with a total of 1, 162 individuals collected. Most of the identifiable life stages of gizzard shad were either post yolk-sac (206) or yolk-sac (285) larvae. The unknown life stage (600), which includes both yolk-sac and post yolk-sac larvae, accounted for most of the gizzard shad. A total of 71 gizzard shad eggs was collected. Gizzard shad was collected from April 19 to July 18 in 23 of the 30 sample weeks (Figure 9). The largest single collection event (four samples) occurred on April 25, when a total of 362 individuals was collected. The mean entrainment density of gizzard shad over the sample period was 92.22/l 000m3 with maximum entrainment density of 1327. 7 /1000m3 in week 13 (Tables. 7 and 8). Total length of gizzard shad larvae ranged from 3.0 to 18 mm with mean length of 5.3 mm. Sunfishes A total of six sunfishes were collected in entrainment samples. All six sunfishes were post yolk-sac larvae and were collected from April 25 to May 2. This group represents the genus Lepomis and includes green sunfish, bluegill, and pumpkinseed. Larvae of these species are not distinguishable from each other at this life stage. Entrainment density of Lepomis spp. was 0.48/1000m3 for the study period with maximum density of 11.5/1000m3 recorded during week 8. Mean total length of this group was 5.0 m with length range between 4.5 and 6 mm. Tessellated darter Tessellated darter was the second most abundant fish collected in entrainment samples with a total of 119 individuals collected. Most tessellated darter were either yolk-sac (44) or post yolk-sac (49) larvae. This species was collected from April 19 to May 30 (Figure 8 PBAPS Entrainment Study Report Rev. 0, February 2013
8). Entrainment density of tessellated darter was 10.111000m3 with maximum density of 185.9/1000m3 occurring in week 11 (Table 7). Mean total length of this group.was 7.0 mm with Jength range between 5 and 17 mm. DISCUSSION AND CONCLUSIONS The resuJts of the 2012 entrainment characterization study were consistent with the expected results based on the known fish species composition in Conowingo Pond and historic entrainment and ichthyoplankton studies in Conowingo Pond in the vicinity of PBAPS. The highest rates of entrainment occurred during the spawning season for the abundant species in Conowingo Pond which extended from April to July. Few fishes were entrained during March, August or September. Recent fish surveys have been completed in Conowingo Pond as a part of a 316(a) Demonstration Study (Normandeau 2011, 2012b). During these field surveys in 2010 and 2011 a total of 43 fish species and 38,145 individuals was collected (Table 5). The dominant species observed were gizzard shad (42.4%), channel catfish (19.5%), spotfui and comely shiners (14.7%), and bluegill (6.6%). The proportion of several of the species observed during these recent field surveys was also reflected in the rates of entrainment of these species observed in the PBAPS outfall discharge. However, many of the abundant species based on recent field surveys were absent from the entrainment samples. Much of a given fish species likelihood of being entrained is related to species-specific life history traits and their preferred spawning locations within a waterbody. Other important factors that affect rates of entrainment include the type of waterbody (lentic, lotic, or tidaJ), location of the cooling water intake structure within the waterbody, design of the cooling water intake, and intake approach velocities of the water entering the cooling water system. Many of the fish species that occur within Conowingo Pond are nest builders that lay adhesive and demersal eggs. Species with these traits include the family Centrarchidae (bluegill, largemouth and smallmouth bass, and green sunfish), Ictaluridae (catfishes), and several darter (Etheostoma spp.) species. These attributes can significantly reduce the likelihood of larval fishes or eggs being entrained and subsequently being transported through the PBAPS cooling water system. Species without these life history traits are more likely to be entrained. These species are broadcast spawners, lay semi-adh~sive eggs that may not be demersaJ. Some of these species include common carp, gizzard shad, some native minnow species, and white sucker. Spawning locations in relation to the PBAPS intake structure are aJso. important in determining rates of entrained fishes. Spawning habitats for most of the nest building species are limited in the immediate vicinity of the PBAPS intake structure. Most of the spawning locations with the highest densities of ichthyoplankton have been previously determined to occur in areas other than those in close proximity to the PBAPS intake structure (Ichthyological Associates 1976, Anjard 1977). Therefore, the eggs and larvae of these species are not likely to be in close proximity of the PBAPS intake structure and to be entrained. Eggs and larvae of nest-building species are more likely to be entrained 9 PBAPS Entrainment Study Report Rev. 0, February 2013
during high flow events or floods that transport eggs or larvae from spawning locations into the water column and subsequently through the cooling water system. Generalist, broadcast spawners that occur in Conowingo Pond tend to spawn over submerged vegetation, woody debris, or other structures. These species include gizzard shad, quillback, and common carp. Primary spawning areas of gizzard shad have been previously determined to include areas in the immediate vicinity of the PBAPS intake structure and downstream near the mouth of Broad Creek (lchthyological Associates 1976). Gizzard shad eggs are more likely to be entrained because spawning occurs in close proximity to the intake structure. Gizzard shad were introduced to Conowingo Pond in 1972 during transport of American shad in the Conowingo Dam fish lifts. The fish lifts are designed to transport adult American shad upstream of the Dam during their migratory spawning runs. The numbers of gizzard shad adults that are transported into Conowingo Pond have increased over recent years. During 2012 a total of 1.2 million adult gizzard shad were introduced into Conowingo Pond from the Conowingo Dam fish lift (Normandeau 2012a). The introduction of these adult gizzard shad during spring of 2012 coincided with the highest entrainment collections of gizzard shad eggs and larvae. Large numbers of adult gizzard shad were observed during a concurrent field study that was being conducted in the vicinity of PBAPS during the spring of 2012. Many of entrained gizzard shad eggs and larvae were likely spawned by the recently introduced gizzard shad completing their migratory spawning runs upriver. Spawning Attributes of Selected Species 'Gizzard shad Gizzard shad spawn from March to August, usually between April and June in temperate latitudes (Miller 1960). Spawning usually occurs at near surface depths (0.3 to l.6m), but sometimes as deep as 15 m, and sometimes over vegetation or debris (Jones et al. 1978, Miller 1960, Wang and Kemehan 1979). Spawning groups swim near the surface and roll about as a mass, ejecting eggs and sperm (Miller 1960). Eggs are demersal and adhere to algae, rocks, *and other objects (Miller 1960). Fecundity (total number of mature eggs in the ovary prior to spawning) is 22,400 to 543,000 eggs per female (Schneider 1969). Channel catfish Channel catfish usually spawn in secluded, semi-darkened nests under rocks, in log jams, in holes, and in other types of cavities (Harlan and Speaker 1956). Nests are constructed in these sheltered areas by both sexes (Clemens and Sneed 1957). They spawn in late spring or early summer when water temperatures reach 24 °C. Females produce from 3,000 to 4,000 eggs per pound of body weight (Clemens and Sneed 1957). Hatching occurs in five to ten days at 26 to 28 °C (Jones et al. 1978). The male cares for the eggs (Clemens and Sneed 1957). 10 PBAPS Entrainment Study Report Rev. 0, February 2013
Banded darter Spawning appears to take place between 20 and 25 °C (Page 1983, Erickson* and Mahan 1982). Banded darters have adhesive eggs which they attach to filamentous algae and aquatic plants (ODNR website). Spawning occurs in riffles of depths less than 60 cm and this darter typically attaches its eggs to vegetation (Pflieger 1975). Fecundity is 80-262 mature ova (Erickson 1977). White Sucker The typical spawning habitat is riffles with largely gravel bottoms in large creeks to large rivers (Jenkins and Burkhead 1993). Fecundity is 20,000 to 139,000 ova (Scott and Crossman 1973). The fertilized eggs adhere to the gravel in riffles or drift downstream where they adhere to the substrate in areas with water of slow velocity (Geen et al. 1966). Tessellated darter In the northern areas, tessellated darters spawn in May or early June and presumably the southern populations spawn earlier. The male chooses a spawning site and guards the site throughout the spawning period. Typically, the adhesive eggs are deposited under an overhanging rock or log or other obstruction but they may spawn on top of flat rocks also (Schmidt 1980). Tsai (1972) reported that fecundity ranged from 54-668 with larger females containing the greater numbers of eggs. A female may not necessarily lay all the eggs she contains, however. The social behavior of the tessellated darter is apparently unique among fishes in that males regularly clean and defend eggs which they did not fertilize (Constantz 1979). Large, behaviorally dominant males defend the few rocks in the stream which are suitable for spawning. After fertilizing eggs deposited by the female at one rock, dominant males often move to other rocks which appear to offer more uncovered spawning surface, apparently because these rocks are preferred by _spawning females. Subordinate males occupy newly-vacated rocks and clean the remaining uncovered surface, incidentally cleaning the dominant male's eggs. Centrarchidae The spawning behavior of all of the centrarchids (Lepomis, Pomoxis, Amb/oplites, and Micropterus) is remarkably similar (Cooper 1983). Males prepare a nest over clean hard substrates, spawn singly with one or more females in the nest, and then drive away all other fishes and other large invaders. The adhesive eggs in the nests are aerated by swimming motions of the male, and the eggs and young are guarded against predators. Native minnow species Notropis, Luxilus, Cyprinella and Pimephales are the four genera that comprise the vast majority of the native minnow species that inhabit Conowingo Pond. According to Jenkins and Burkhead (1993), Notropis and Luxilus are relatively primitive broadcast spawners and Cyprine/la and Pimephales are egg-attachers. Members of the genus Notropis typically spawn in shallow runs or riffles, either on unmodified gravel substrate or over minnow nests, sucker redds, or nests of other species (Pflieger 1975, R. J. Miller 1964). Egg counts of the. saffron shiner (Notropis rubricroceus) were 445-1,174 (Outten 11 PBAPS Entrainment Study Report Rev. 0, February 2013
1958). Egg counts of the emerald shiner (Notropis atherinoides) were 888-5,443 (Heufelder and Fuiman 1982). Species in the genus Luxilus commonly or exclusively are associates of gravel nest-building minnows; some species dig rudimentary. spawning pits (Jenkins and Burkhead 1994). Some striped shiners (Luxilus chrysocephalus) produced more than 1,000 eggs (Jenkins and Burkhead 1993). Cyprinella species such as spotfinshiner (Cypri11ella spi/optera) typically deposit eggs in crevices in loose bark on trees or stumps or other "artificial" substrates, and are often fractional spawners, producing up to 3,600 to 7,000 eggs in total per year (Jenkins and Burkhead 1993). Spawning of Pimephales typically occurs between late May and September. Spawning takes place in pool shallows beneath stones or debris. When natural cavities are lacking, sometimes the male burrows through the silt to create a space beneath an object (Parker 1964). The eggs are usually deposited in the cavities in a* single layer, rarely in clumps (Jenkins and Burkhead 1993). Females of thi~ genus, like Cyprinella, are fractional . spawners (Jenkins and Burkhead 1993). Males defend the nest. Comparison to previous entrainment study at PBAPS The most recent historical entrainment study was performed by Anjard (1977) who coJlected weekly ichthyoplankton samples at three locations (both intake ponds and discharge canal) at PBAPS from May through July in 1975-1976. Collections were taken by towing a plankton net from a boat for 10-minute intervals. A total of seven eggs larvae of 20 species were collected in entrainment samples over the 2-year period. The . inost common were larvae of the gizzard shad, common carp, quillback, channel catfish, 'and tessellated darter. The gizzard shad, common carp, and quillback made up over 80% of the collected larvae while larvae of the sunfishes, smalJmouth bass, white crappie, and walleye comprised 2%. The mean density of larvae in the 1975 and 1976 spawning seasons was 131.6/1000m3 of which 60;0/1000m3 (44%) were gizzard shad (Table 6). Entrainment varied over the 3-month sampling period. The highest densities of the commonly entrained fish larvae qccurred between the last week in May and the first week in July. From May through early June larvae of the common carp and quillback were abundant, while from mid-June until mid-July the gizzard shad and channel catfish predominated. The larvae of sunfishes were entrained in June and July, shield darter and tessellated darter in June. The species composition, densities, and seasonal occurrence of entrained fish larvae were similar to those observed in Conowingo Pond adjacent to the Peach Bottom intakes (Anjard 1975* and 1976). Estimated entrainment density of all fishes was slightly lower (122.6/1000m3) in 2012 compared to 1975-1976 (average= 131.6/1000m3) (Tables 6 and 8). A total of IO taxa were entrained in 2012 compared to the 20 taxa collected during the historic entrainment study. Gizzard shad had the highest entrainment densities during 2012 (92.2/1000m3) and during the historic study (60/1000m3). No quillback were collected in 2012 compared to mean of 26.6/1000m3 in the historic study. Common carp entrainment 12 PBAPS Entrainment Study Report Rev. a, February 2013
density was also lower in 2012 (0.13/1000m3) compared to historic study (22/1000m3). Other species that were collected during both entrainment studies with similar entrainment densities included tessellated darter, channel catfish, spottail shiner, white sucker, and sunfishes (Tables 6 and 8). In general entrainment rates were lower for most species in 2012 compared to the historic study. Part of the differences in entrainment rates may be related to the locations that the samples were collected from in the two entrainment studies. Samples collected during 2012 were collected from the PBAPS discharge outfall where most specimens likely were entrained through the PBAPS cooling system. The samples collected in 1975-1976 were collected from the intake ponds (each 3-acres in size) and a portion of the fishes collected were not likely to be entrained, but rather may have been living within the intake ponds and never been subject to entrainment through the PBAPS cooling system. Species of Special Concern No state or federally listed endangered or threatened species were collected in the entrainment samples. However, two species of concern, Chesapeake logperch and American eel, occur within Conowingo Pond and a brief discussion of these species follows. The Chesapeake logperch (Percina bimaculata) was recently listed as a threatened species in Pennsylvania and is also currently listed as threatened in the state of Maryland. This species has been recently collected in Conowingo Pond (Table 6). The Chesapeake logperch range includes the lower Susquehanna River and several tributaries including Fishing Creek, Muddy Creek, Peters Creek, Michael Run, and Octoraro Creek. This species only occurs in approximately 30 combined stream and river miles within Pennsylvania. No Chesapeake logperch were collected during entrainment sampling in 2012. A single ju\\'enile American eel (Anguilla rostrata) was collected in an entrainment sample on September 27. Few American eels are present within Conowingo Pond and none were collected during tecent fish surveys in Conowingo Pond (Table 6). The American eel population is in apparent decline and is considered a species of concern. In 2011 the U.S. Fish and Wildlife Service initiated a new status review for the American eel as a result of a 90-day finding on the Council for Endangered Species Act Reliability's petition to list the American eel as threatened under the authority of the Endangered Species Act. REFERENCES Anjard, C. A. 1975. Meter Net Catches, p. 3-54 to 3-61. In T. W. Robbins and D. Mathur, Peach Bottom Atomic Power Station Postoperational Report No. 3 on the Ecology of Conowingo Pond for the Period of July 1974-December 1974. Ichthyological Associates, Inc., Drumore, Pennsy Ivania. 13 PBAPS Entrainment Study Report Rev. 0, February 2013
Anjard, C. A. 1976. Meter Net Catches. p. 3-54 to 3-61. In T. W. Robbins and D. Mathur, Peach Bottom Atomic Power Station Postoperational Report No. 5 on the Ecology of Conowingo Pond for the Period July 1975-December 1975. Ichthyological Associates, Inc., Drumore, Pennsylvania. Anjard, C. A. 1977. Entrainment of fish eggs and larvae at the Peach Bottom Atomic Power Station, Pennsylvania. November 1977. RMC Ecological Division. Presented at the.1978 Northeast Fish and Wildlife Conference. Clemens and Sneed. 1957. The spawning behavior of the channel catfish, Jctalurus punctatus. U.S. Fish and Wildlife Service Special Scientific Report, Fisheries 219. As cited in Jenkins, R. E., and N. M. Burkhead. 1993. The Freshwater Fishes of Virginia. American Fisheries Society, Bethesda, MD. Constantz, G.D. 1979. Social dynamics and parental care in the tessellated darter (Pisces: Percidae ). Proceedings of the Academy of Natural Sciences of Philadelphia, Vol. 131, (1979), pp. 131-138. Cooper, E. L. 1983. Fishes of Pennsylvania and the Northeastern United States. The Pennsylvania State University Press, University Park, PA. EPRl. 2005. Entrainment Abundance Monitoring Technical Support Document. Electric Power Research Institute Report No. 1011280. Palo Alto, CA. Erickson, J.E. 1977. The life history of the banded darter, Etheostoma zonale zonale (Cope), in the Cannon River, Minnesota Dissertations Abstracts International (Section B) 38:2569. As cited in Jenkins, R. E., and N. M. Burkhead. 1993. The Freshwater Fishes of Virginia. American Fisheries Society, Bethesda, MD
- Erickson, J.E. and D.C. Mahan. 1982. Biology, Distribution, and status of the banded darter, Etheostoma zonale, in Michigan. Michigan Academician. 14(4): 347-358.
As cited at http://mnfi.anr.msu.edu/abstracts/zoology/Etheostoma zonale.pdf Accessed February 2, 2013. Geen, G. H., T. G. Northcote, G. F. Hartman, and C. C. Lindsey. 1966. Life histories of two species of catostomid fishes in Sixteenmile Lake, British Columbia, with particular reference to inlet stream spawning. J. Fish. Res. Board Can. 23(11):1761-1788. As cited in Twomey, K. A., K. L. Williamson, and P. C. Nelson. 1984. Habitat suitability index models and instream flow suitability curves: White sucker. U.S. Fish Wildl. Service FWS/OBS-82/10.64. 56 pp. Harlan, J. R. and E.B. Speaker. 1956. Iowa Fish and Fishing. Iowa State Conservation Commission, Des Moines, Iowa. 14 PBAPS Entrainment Study Report Rev. O, February 2013
Heufelder, G.R. and L.A. Fuiman. 1982. Family Cyprinidae, carps and minnows. p. 174-344. In N.A. Auer (ed.) Identification oflarval fishes of the Great Lakes basin with emphasis on the Lake Michigan drainage. Great Lakes Fishery Commission, Ann Arbor, Michigan. Special Puhl. 82-3, 744 p. As cited in Jenkins, R. E., and N. M. Burkhead. 1993. The Freshwater Fishes of Virginia. American Fisheries Society, Bethesda, MD. Ichthyological Associates, Inc. 1976. Supplemental Materials Prepared for the Environmental Protection Agency 316 (a) Demonstration for PBAPS Units No. 2 and 3 on Conowingo Pond. June 1976. Prepared for Philadelphia Electric Company. Jenkins, R. E. and N. M. Burkhead. 1993. Freshwater fishes of Virginia American Fisheries Society, Bethesda, Maryland. Jones, P.W., F.D. Martin, and J.D. Hardy, Jr. 1978. Development of the Fishes of the Mid-Atlantic Bight: An atlas of the egg, larval, and juvenile stages, Volume I. U.S. Fish and Wildlife Service Biological Service Program FWS/OBS-78/12. Miller R. J. 1964. Behavior and ecology of some North American Cyprinid fishes. American Midland Naturalist 72:313-357. Miller, R.R. 1960. Systematics and biology of the gizzard shad (Dorosoma cepedianum) and related fishes, Fishery Bulletin 173, Fishery Bulletin of the Fish and Wildlife Service, Volume 60. U.S. Fish and Wildlife Service, Washington, D.C. Normandeau Associates, Inc. 2008a. Entrainment and Impingment Monitoring Studies at Fairless Hills Generating Station During 2005-2006. Prepared for Exelon Generation Company, LLC. December 2008. Normandeau Associates, Inc. 2008b. Entrainment and Impingment Monitoring Studies at Eddystone Generating Station During 2005-2006. Prepared for Exelon Generation Company, LLC. December 2008. Normandeau Associates, Inc., 2011. 2010 Interim Report for the Thermal Study to Support a 316(a) Demonstration. Normandeau Associates, Inc. and ERM, Inc. February 2011. Normandeau Associates, Inc. 2012a. Summary of Operations at the Conowingo Dam East Fish Passage Facility, Spring 2012. Prepared for Exelon Generation Company, Darlington, MD. 15 PBAPS Entrainment Study Report Rev. 0, February 2013
Normandeau Associates, Inc. 2012b. 2011 Interim Report for the Thermal Study to Support a 316(a) Demonstration, Peach Bottom Atomic Power Station, March 2012. Prepared for Exelon Nuclear, March 2012.
- Normandeau Associates, Inc. 2013(in press). 2012 Interim Report for the Thermal Study to Support a 316(a) Demonstration, Peach Bottom Atomic Power Station, March 2013. Prepared for Exelon Nuclear, March 2013.
Ohio Department of Natural Resources. Banded Darter. http://www.dnr.state.oh.us/Home/species a to z/bandeddarter/tabid/21853/Defau lt.aspx Accessed February 4, 2013 Outten, L. 1958. Studies of the life history of the cyprinid fishes Notropis ga/acturus and rubricroceus. Journal of the Elisha Mitchell Scientific Society 74:122-134. Page, L.M. 1983. Handbook of Darters. T.F.H. Publishing, Inc. Neptune City, New Jersey. 271pp Parker, H. L. 1964. Natural history of Pimephales vigilax (Cyprinidae). Southwestern Naturalist 8:228-235. As cited in Jenkins, RE. and N. M. Burkhead. 1993. Freshwater fishes of Virginia. American Fisheries Society, Bethesda, Maryland. Pflieger, W. L. 1975. The Fishes of Missouri. Missouri Department of Conservation, Jefferson City, Missouri. Schmidt, R. E. 1980. The Tessellated Darter. American Currents. http://www:nanfa.org/articles/actessel.shtml Accessed February 4, 2013 Schneider, R.W. 1969. Some aspects of the life history of the gizzard shad, Dorosoma cepedianum, in Smith Mountain Lake, Virginia. Master's Thesis. Virginia Polytechnic Institute and State University, Blacksburg, Va. Scott W.B. and E. J. Crossman. 1973. Freshwater fishes of Canada. Fisheries Research Board of Canada Bulletin 184. Tsai, C. 1972. Life history of the eastern johnny darter, Etheostoma olmstedi Storer, in cold tailwater and sewage-polluted water. Transactions of the American Fisheries Society 101(1): 80-88. Wang, J.C. S. and R. J. Kernehan. 1979. Fishes of the Delaware Estuaries, a guide to early life histories. EA Communications, Ecological Analysts, Inc., Towson, Maryland. 410 pp. 16 PBAPS Entrainment Study Report Rev. 0, February 2013
FIGURES
r Figure 1. Map of Conowingo Reservoir showing locations of Peach Bottom Atomic Power Station and other power plants.
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Table 1. Total number and percent composition offish collected in entrainment samples at the PBAPS discharge structure outfall, March 8 to September 27 2012. Common Name Scientific Name Total Number Percent Composition Americ::an eel Anguilla rostrata l 0.1 Banded darter Etheostoma zonale 19 1.2 Carp and minnow family Cyprinidae 5 0.3 Channel catfish /ctalurus punctatus 11 0.7 Common carp Cyprinus carpio 2 0.1 Darter species Etheostoma spp. 9 0.6 Gizzard shad Dorosoma cepedianum 1162 76.0 greenside darter Etheostoma blennioides I 0.1 Sunfishes Lepomis spp. 6 0.4 Spottail shiner Notropis hudsonius 2 0.1 Sucker family Catostomidae 0.1 Sunfish family Centrarchidae 1 0.1 Tessellated darter Etheostoma olmstedi 119 7.8 unidentified fish 187 12.2 White sucker Catostomus commersoni 3 0.2 Total l 529
Table 2. Total number of each taxon and life stage collected In entrainment samples at the PBAPS discharge structure outfall, March 8 to September 27 2012. Life Sta e Taxon Unknown ESB Yolk-sac larvae Post yolk-sac larvae YOY Yearling and older Total American eel 1 1 Banded darter 1 8 10 19 Cyprlnidae 5 5 Channel catfish 3 8 11 Common carp 1 2 Etheostoma species 7 2 9 Gizzard shad 600 71 285 206 1,162 greenslde darter 1 1 Lepomls species 6 6 Spottail shiner 1 2 Catostomldae 1 Centrarchidae 1 1 Tessellated darter 22 44 49 4 119 unidentified fish 134 2 51 187 White sucker 1 2 3 Total Number 765 74 339 336 13 2 1,529 Percent Composition 50.0 4.8 22.2 22.0 0.9 0.1
Table 3. Number of each taxon collected in entrainment samples during each time interval at PBAPS, March 8 to September 27 2012. Time Period (hours) Taxon 06:00-12:00 12:00-18:00 18:00-00:00 00:00-06:00 American eel 0 0 0 1 Banded darter 5 2 4 8 Cyprinidae 0 0 4 1 Channel catfish 0 1 3 7 Common carp 1 0 1 0 Etheostoma species 1 4 2 2 Gizzard shad 176 352 395 239 Greenside darter 1 0 0 0 Lepomis species 3 0 3 0 Spottail shiner 0 0 2 0 Catostomidae 1 0 0 0 Centrarchidae 0 0 1 0 Tessellated darter 9 8 69 33 White sucker 0 1 2 0 Total lcthyoplankton 197 368 486 291 Percent Composition 15 27 36 22 Total Number of Samples 32 26 33 21
Table 4. Descriptive statistics for total length of fishes collected in entrainment samples from PBAPS discharge structure outfall, March 8 to September 27 20 I 2. Total Length (mm) Taxon Mean Minimum Maximum Number Measured American eel 128 128 128 I Banded darter 7.6 6 10 12 Cyprinidac 7.3 5 13 5 Channel catfish IS.S 14.5 17 10 Common carp s.o s s I Gizzard shad 5.3 3 18 156 Grccnside darter 6.5 6.5 6.5 1 Lepomis species 5.0 4.5 6 5 Spottail shiner 27.5 20 35 2 Catostomidae 8.0 8 8 I Centrarchidae 6.5 6..5 6.5 I Tessellated darter 7.0 5 17 88 White sucker 8.3 8 8.5 2 Total 284
Table 5. Total number and percent composition of fishes collected in Conowingo Pond using electrofisher; seine, and trawl during 2010 and 2011. Species Total Number Percent Composition Alewife I <O.l American shad l <0.1 Banded darter 5 <0.1 Banded killifish 273 0.7. Black crappie 5 <O.l Bluegill 2,515 6.6 Bluntnose minnow 676 1.8 Channel catfish 7,432 19.5 Comely shiner 2,611 6.8 Common carp 320 0.8 Common shiner 7 <0.1 Creek chub 4 <0.1 Eastern mosquitofish I <0.1 Falltish 36 0.1 Flathead catfish 60 0.2 Gizzard shad 16,170 42.4 Golden shiner 32 0.1 Green sunfish 1,507 4.0 Greenside darter 19 <0.1 Hybrid Striped bass 9 <0.1 Largemouth bass 169 0.4 Logperch 142 0.4 Mimic shiner 25 0.1 Northern hogsucker 41 0.1 Pumpkinseed 13 <0.l Quill back 102 0.3 Rainbow smelt 1 <0.1 Redbreast sunfish 9 <0.l River chub 1 <0.1 Rock bass 507 1.3 Shield darter 32 0.1 Shorthead redhorse 145 0.4 Smallmouth bass 553 1.4 Spotfin shiner 3,003 7.9 Spottail shiner 1,131 3.0 Striped bass l <0.1 Swallowtail shiner 9 <0.1 Tessellated darter 313 0.8 Walleye 176 0.5 White crappie 20 0.1 White perch 40 0.1 White sucker 13 <0.1 Yellow perch 15 <O.l Total Number 38,145 Total Species 43
Table 6. Mean densities of larval fishes collected ~ith a towed plankton net within the PBAPS intake ponds during 1975 and 1976. Density{number/1000m 3 ~ Taxon 1975 1976 Mean Common carp 6.9 35.3 22 Channel catfish
- 4. 7 4.1 4.4 Comely shiner 0.1 0.1 0.1 Creek chub 0
0.1 Gizzard shad 34.8 78.6 60 Golden shiner 0 0.1 Logperch 0.1 0 Quill back 27.6 25.7 26.6 Redbreast sunfish 0.1 0 Rock bass 0.1 0 0.1 Shield darter 5.3 1.6 3.3 Smallmouth bass 0.4 0 0.2 Spotfin shiner 0.1 0.1 0.1 Spottail shiner 0.1 0.1 0.1 Sunfishes 1.5 1.4 1.5 Tessellated darter 5.8 8.7 7.3 Unidentifiable fish 0.5 8.1 4.6 Unidentified minnows 3.3 0.6 1.9 Unidentified suckers 0.1 0 0.1 Walleye 0.7 0.3 0.6 White crappie 0.3 0.6 0.5 White sucker 0.3 0.7 0.5 Yellow bullhead 0 0.1 0.1 Total 92.7 166.2 131.6
Table 7. Mean density of each trucon collected during weekly entrainment sample collections at PBAPS discharge outfall, March 8 to September 27 2012. Sample Week Taxon Mean Density (number/1000m3)1 2 Spottail shiner 2.4 7 Banded darter 5.0 7 Cyprinidae 3.0 7 Gizzard shad 15.5 7 Tessellated darter 15.2 8 Gizzard shad 822.5 8 Lepomis species 11.5 8 Tessellated darter 17.6 9 Banded darter 2.9 9 Common carp 3.4 9 Gizzard shad 10.6 9 Lepomis species 1.5 9 Catostomidae 1.5 9 Tessellated darter 15.9 10 Banded darter 21.9 10 Gizzard shad 17.0 10 Tessellated darter 24.4 IO Unidentified Fish 80.7 11 Etheostoma species 12.2 11 Gizzard shad 68.5 11 Tess~llated darter 185.9 11 Unidentified Fish 36.7 11 White sucker 4.9 12 Banded darter 3.8 12 Etheostoma species 2.2 12 Gizzard shad 531.6 12 Centrarchidae 1.9 12 Tessellated darter 13.7 12 Unidentified Fish 61.4 13 Etheostoma species 8.7 13 Gizzard shad 1,327.7 13 Tessellated darter 13.1 13 Unidentified Fish 174.7 13 White sucker 4.4
Table 7. Continued. Sample Week Tax on Mean Density (number/1000m3) 1 14 Cyprinidae 5.5 14 Etheostoma species 2.2 14 Gizzard shad 19.0 14 greenside darter 2.2 14 Tessellated darter 2.2 14 Unidentified Fish 7.7 15 Banded darter 4.2 15 Cyprinidae 2.1 15 Channel catfish 2.0 15 Gizzard shad 53.6 15 Unidentified Fish 10.4 16 Channel catfish 14.7 16 Gizzard shad 24.l 16 Unidentified Fish 14.2 17 Channel catfish 2.4 17 Gizzard shad 139.2 17 Unidentified Fish 2.4 18 Banded darter 2.4 18 Channel catfish 2.3 18 Gizzard shad 36.3 18 Unidentified Fish 25.0 19 Gizzard shad 153,6 19 Unidentified Fish 88.7 20 Channel catfish 2.3 20 Gizzard shad 21.9 20 Unidentified Fish 7.3 21 Channel catfish 2.4 21 Gizzard shad 4.9 21 Unidentified Fish 7.3 22 Banded darter 4.4 24 Spottail shiner 2.4 30 American eel 2.4 1 Average density of taxon in the four samples collected each week
Table 8. Mean density of each taxon in entrainment sample collections at PBAPS discharge outfall, March 5 to September 27 2012. American eel Banded darter Cyprinidae Channel catfish Common carp Etheostoma species Gizzard shad Greenside darter Lepomis species Spottail shiner Catostomidae Centrarchidae Tessellated darter Unidentified Fish White sucker Total Taxon Mean Density (number/I OOOm3) 1 0.08 1.59 0.37 0.92 0.13 0.74 92.22 0.08 0.48 0.18 0.05 0.08 10.06 15.32 0.26 122.58 1 Mean density determined by averaging density for each sample collected during the study period
WORK.PLAN FOR AN ENTRAINMENT CHARACTERIZATION STUDY AT PEACH BOTTOM ATOMIC POWER STATION Prepared for: Nuclear By: Normandeau Associates, Inc. Revision 1, July 2012
Table of Contents INTRODUCTION............................................................................................. THE STATION................................................................................................... COOLING WATER SYSTEM...... :......................................................................... ENTRAINMENT CHARACTERIZATION STUDY.............................................OBJECTIVE...................................................................................................... SAMPLING FREQUENCY AND LOCATION.............................................................. SAMPLE COLLECTION METHOD...... ******............................................................. SAMPLE PROCESSING AND TAXONOMY.............................................................. - 5
- DATAANALYSISAND REPORTING............................. :........................................ SCHEDULE....................................................................................................... QUALITY ASSURANCE AND CONTROL................................................................. REFERENCES................................................................................................ List of Figures Figure 1. Map of Conowingo Reservoir showing locations of Peach Bottom Atomic Power Station and other power plants.
Figure 2. Peach Bottom Atomic Power Station intake structures and discharge. PBAPS Entrainment Wor1< Plan. Rev. 1, July 9, 2012
Record of Revisions Revision Date Pages/Sections Changed Brief Description February All Initial release 000 2011 001 July 2012 Page4 Collection pump size changed to 3-inch with corresponding pwnp rate at approximately 150 gpm. Total pumping time for one sample adjusted to 180 minutes (3hrs). ii PBAPS Entrainment Work Plan. Rev. 1, July 9, 2012
INTRODUCTION Peach Bottom Atomic Power Station (PBAPS) operates under NPDES Permit No. PA 0009733 which was issued November 30, 2010 with an effective date of January 1, 2011. The permit contains a requirement for an entrainment characterization study to be conducted over at least one fish spawning season as described in the permit within Part C. section 11.D.1 as follows: Entrainment Characterization Study
- 1. Within 90 days of permit issuance, The Permittee shall submit a Work Plan to conduct entrainment sampling (see Section 2 below) of the non-contact coaling water inner intake structure at the Peach Bottom Atomic Power Station
("Facility'?. The Permittee shall respond to the Department's comments on the Wark Plan within 30 days of receipt. Startup of the sampling program shall occur at the beginning of the next fish spawning season following receipt of written Department approval of the Wark Plan, or an alternate schedule approved by the Department, in writing.
- 2.
The Work Plan shall include a detailed proposal far the fallowing entrainment sampling of fish eggs and larvae. a) Entrainment data collections shall occur for a period of at least one fish spawning season, approximately March through September, at a sampling frequency sufficient to characterize the entrainment occurring. b) Voucher specimens of two (or one if only one is available) Chesapeake logperch (Percina bimaculata) and federal and state threatened, endangered and. candidate fish species collected shall be retained and catalogued. The Department along with the appropriate state and federal authorities shall be notified within 24-hours if any federal or state threatened, endangered, or candidate fish species are identified. c) Entrainment data collection shall be performed by qualified consultants and/or trained professionals with the skills and knowledge appropriate for producing valid samples and evaluations under a formal QA/QC plan. PBAPS Entrainment Work Plan. Rev. 1, July 9, 2012
This document is the Work Plan for the required entrainment characterization study. It describes the proposed study to be performed in response to the permit requirement. The Station PBAPS is located in York County, Pennsylvania, on the west shore of Conowingo Reservoir (Pond), approximately 3 miles upstream from the Pennsylvania-Maryland border (Figure 1 ). PBAPS is a two-unit nuclear-fueled power generating facility with a nominal generating capacity of 2,304 megawatts electrical (MWe). The Station operates as a base-load facility with both units normally generating at full capacity. Unit 2 began commercial operation in June 1974 and Unit 3 entered commercial service in December 1974. Conowingo Pond was formed in 1928 with the construction of Conowingo Hydroelectric Station. Cooling Water System PBAPS utilizes a once-through cooling system to remove waste heat from the station's condensers. The cooling water for both units is withdrawn from the Pond through an outer intake structure located on the shoreline of Conowingo Pond, through two 3-acre intake ponds (one serving each unit), and then through an inner intake structure as shown in Figure 2. The outer intake is approximately 480 ft long with a fixed vert!cal trash rack on the face of the intake followed by a set of 24 vertical traveling screens which have 3/8-inch mesh openings. The trash rack consists of 0.25-inch by 3-inch steel bars spaced 3.5 inches on center and is designed to prevent large debris and ice from entering the intake. The trash rack is cleaned periodically per a preventative maintenance program. After passing through the outer intake, the cooling water flows through the intake ponds to the inner intake. Fish live and grow in the ponds and can enter the ponds through the outer screens when they are small, by being carried over the screens if they are not removed during the screen cleaning process, and through the cross-tie gate from the discharge canal in winter. During cold weather and on an as-needed basis, a cross-tie PBAPS Entrainment Work Plan. Rev. 1, July 9, 2012
gate between the discharge basin and the intake ponds is opened to re-circulate some of the heated discharge water. At the inner intake, water enters the pumphouse through eight screen bays. Two are devoted to service water flows and six convey water to the circulating water pumps. Water flowing to the circulating water pumps is screened by 3/8-inch mesh dual-flow, or dual-entry single-exit, traveling screens before being pumped through.the condensers. The heated-water is then discharged to a discharge basin as shown in Figure 2. ENTRAINMENT CHARACTERIZATION STUDY Objective The primary objective of the entrainment study is to identify and quantify the densities of the ichthyoplankton (fish eggs and larvae) entrained through the PBAPS. Sampling Frequency and Location The sampling frequency of the entrainment characterization study is based on guidance provided by the Electric Power Research Institute (EPRI) in Entrainment Abundance Monitoring Technical Support Document (EPRI 2005) and based on similar PA DEP-approved entrainment studies conducted recently by Normandeau Associates, Inc. (Normandeau) at other generating stations in Pennsylvania. Entrainment sampling is proposed to be performed *over one 24-hour sampling event each week from March through September 2012. Entrainment sampling is proposed to be conducted at the circulating water discharge outfall for Units 2 and 3, not at the inner circulating water intake* structure as stated in the NPDES permit. Exelon has serious plant safety concerns regarding maintaining the integrity of the nuclear plant's water supply and will not allow the sampling equipment to be installed within the inner intake structure. As discussed in EPRI {2005), sampling in the power plant discharge actually has advantages over sampling at the intake, such as: e Certainty that all organisms collected were actually entrained and PBAPS Entrainment Work Plan. Rev. 1, July 9, -2012
Turbulence reduces potential bias resulting from non-random distribution of entrained organisms. The weekly sampling events will be scheduled for approximately the same day each week to assure regular spacing of the events. If either planned or unanticipated events interfere with this schedule, an adjustment of one or more days may be necessary. If the circulating water pumps of both Unit 2 and Unit 3 are not operable for an extended period (i.e., for several days during a week), the sampling will not take place that week. As long as one unit is operating, the sampling will take place. Sampling will be performed by trained personnel from Normandeau Associates, Inc. operating under an approved sampling protocol. Sample Collection Method The samples will be collected with a 3-inch pump that obtains the sample water through a 3-inch diameter pipe positioned vertically in the discharge basin as close as feasible to the discharge structure. The pump is to be located on the bank of the discharge basin with the suction line leading to the sampling pipe which will be attached a small pontoon work boat just off the rock-filled structure at the discharge outfall (Figure 2). Samples will be obtained from mid-depth in the water column through a 90 degree elbow or "T" facing into the current. Total target volume of each pumped sample is approximately 100 cubic meters. The suction line will convey the sample water to the sampling pump and then through a calibrated in-line flow meter. The electric pump will have a pumping rate of approximately 150 gallons per minute as shown on the in-line flow meter. This flow rate is approximately 0.6 cubic meters per minute. Thus, it takes a total of approximately 180 minutes or approximately 3 hours of pumping to obtain a single sample of approximately 100 cubic meters. One sample will be collected every 6 hours for each weekly 24-hour sampling event. From the pump the sample is discharged through a 4-inch pipe into a plankton net constructed of 500-micron mesh and suspended in a large tank of water. The velocity of water exiting the hose is thereby reduced greatly reduced before encountering the mesh of the net. The lower velocity reduces potential damage to the eggs and larval fish specimens. PBAPS Entrainment Work Plan. Rev. 1, July 9, 2012
The 500-micron mesh net is fine enough to capture the eggs and larvae of all fishes likely to be encountered at PBAPS. The contents of the plankton net will be rinsed down from the outside with ambient water and carefully transferred to sample containers. The samples will be immediately preserved with 1 O percent buffered formalin, labeled (both inside and out) and sent to Normandeau's laboratory for analysis. The sample is acceptable if all of the following conditions have been met: A minimum sample volume of 100 m3 was collected, unless this volume is impractical to achieve due to clogging, pumping problems, etc., The net was not torn, The flowmeter was not physically damaged, The pumping apparatus was deployed at the appropriate depth, and None of the ichthyoplankton sample was lost or spilled during the net rinse down and sample transfer steps: For each sample the following information will be recorded: Volume of water filtered, Intake water temperature, dissolved oxygen, and pH at the start of each sample, Date and time of the day at the start and end of each sample, Identification of the circulating water and other major pumps in operation at the start and end of each 24-hour sampling event, Names of the sample collectors, and Any deviations from the sampling protocol, unusual conditions, or other pertinent observations. Sample Processing and Taxonomy In general, the entire sample will be processed for ichthyoplankton (eggs and larvae) and early juvenile fish. In samples where fish eggs, larvae or juveniles are numerous, the sample may be subsampled using a plankton splitter so that the fraction of the sample analyzed reaches a quota of at least 200 organisms (all species and life stages combined). Samples will be sorted under magnification to ensure that all organisms are removed. Some samples may be difficult to split at the sort stage (e.g., samples heavy in detritus). If the number of organisms warrants it, these samples will be split after sorting but prior to identification. PBAPS Entrainment Work Plan. Rev. 1, July 9, 2012
The organisms will be removed from the samples, identified to the lowest taxonomic category practicable (generally species), and counted. Larvae will be categorized by lifestage into prolarvae (yolk-sac larvae), and postlarvae (post yolk-sac larvae). For each sample a maximum of 20 individuals for each species and life stage category will be measured for total length to the nearest 0.1 mm (nearest 1.0 mm for juvenile fish). All ichthyoplankton specimens will be retained for the duration of the study. If any Federal or Pennsylvania endangered, threatened, or candidate fish species are collected, the appropriate Federal and state authorities will be notified within 24 hours of making a confirmed identification of any of these important species. Specimens of the genus Percina will be retained for transfer to the PA DEP at a later date. Data Analysis and Reporting All identified organisms will be enumerated and the density of collected organisms (by lifestage) will be calculated by relating the number observed to the volume of water comprising the sample. Evaluation will be made of species' occurrences over diel and longer time periods over the spawning season. Descriptions of species composition and abundance will be provided. A final report will describe the methods and results of the entrainment study. Schedule Sampling will begin during the week of March 4, 2012 and continue once weekly through September 2012. The report for the entrainment characterization study will be submitted to the PA DEP by Mar~h 1, 2013. Quality Assurance and Control Entrainment sampling will be performed by trained individuals from Normandeau working under a standard operating procedure and quality assurance plan developed for the entrainment study. Field instruments will be calibrated prior to each sampling event according to the manufacturer's specifications. Laboratory processing and identification shall be performed by Normandeau's trained technicians and experienced taxonomists, respectively, operating under a formal QAJQC plan. PBAPS Entrainment Work Plan. Rev. 1, July 9, 2012
REFERENCES EPRI. 2005. Entrainment Abundance Monitorin*g Technical Support Document. Electric Power Research Institute Report No. 1011280. Palo Alto, CA. PBAPS Entrainment Work Plan. Rev. 1, July 9, 2012
7 Appendix B.. Scientific and common names of rishes collected in Conowingo Pond. Cluptildati Herrings BdonUtati Needlerishes Dorosoma cepedianum Gizzard shad Strongylura marina Atlantic needlefish Cyprinidat! Carps and minnows Cyprinodontidat! Kllllrtshes Clinostomus funduloides Rosyside dace Fundulus diaphanus Banded killifish Cyprinella*spiloptera Spotfin shiner Cyprinus carpio Common carp PerclchthyldH Temperate basses Exog/ossum maxi/lingua Cutlips minnow Marone americana White perch Lw:ilus cornutus Common shiner Marone saxatilis Sbipcd bass Nocomis micropogon River chub Notemigonus cryso/eucas Golden shiner Ct!lltnlrchldat! Sunrishes Notropis amoenus Comely shiner A mbloplites rupestris Rock bass Notropis hudsonius Spottail shiner Lepomis auritus Redbreast sunfish Notropis procne Swallowtail shiner Lepomis cyanellus Green sunfish Notropis rubellus Rosyfilcc shiner Lepomis gibbosus Pumpkinsced Notropis vo/ucellus Mimic shiner Lepomis macrochirus Bluegill Pimephales notatus Bluntnose minnow Mlcropterus dolomieu Smallmouth bass Semotilus otromaculatus Creek chub MicroptenlS sa/moides Largemouth bass Semoti/us corpora/is Fallfish Pomoxis annularis White crappie Pomoxis nigromaculatus Black crappie Catostomldat! Sucken Carp/odes cyprinus Quillback Pen:ldae Perches Catostomus commersoni White sucker Etheostoma blennioidu Grcenside darter Hypentelium nigricaiis Northern hog sucker Etheostoma olmstedi Tessellated darter Moxostoma macrolepidotum Shorthead rcdhorse Etheostoma zonale Banded darter PercajTtzffscens Yellow perch /cta/Jlrldae Bullhead catfishes Percina blmaculata Chesapeake logpcrch lctalurus punctatus Channel catfish Stizostedion vitreum Walleye Py/odictis olivaris Flathead catfish
I i - Example Verification Completion Form Page 1of1 Verification Documentation EN-AA-105 Revision 4 Page 14 of 14 / 3-(17 Origination Date: a/rft.3 />> tu> Submittal Due Date: :31t(n> Correspondence/Letter number: Agency/External Stakeholder: Recipient of Correspondence: --,1-/r.. 11L.<t""'~~@~1 ... A....,-=-:1--* ~/l!IJ/J5.z:a;;;=....1ft...s.~.::=~:r.~r..1.6""'*"-~~~~u<~kl!~....1./)/I.~. fl'l'~-- (name ~nd title if known) Purpose of Submittal: optQ. fvti!MA/tmJ7(114f//OD'rz/!l1.:µ/S!l.Jl}/)U/{!!T Originating Office: 0 Cantera 0 Kennett Square C!!I Site (.Jf.nl~ Preparer: __..(j......,.1#""'""""'5""""* (~!.K.f..----~ ....... U-~-......,,,_) __ (print) Peer Reviewer: X @l?rOQ111.5 (print)* Certified Mail Return Receipt Requested: (specify) 3/tt: O Yes l&f No m &:;1. -rfiJl!dJV6-Approvals (check box if applicable) Applicable Date Review Signature of Reviewer Date of Needed Review Site Departments Chemistry s, () '/);.11[.t. riZI $/~ ... <l.e1.4ttltfr)(J J JU{ 3/11/r~ Operations D 7 Engineering D I Regulatory Assurance D Other: D (specify) Corporate SME/FAM D Site Manaaement Plant Manager D Site Vice President D D Report Signed and Approved Attach additional page for comments.
January 7, 2019 U.S. Nuclear Regulatory Commission ENCLOSURE 9 09_NAl_2014a.pdf [NAI] Normandeau Associates, Inc. 2014a. "Data Report or Intake Screen Sampling at Peach Bottom Atomic Power Station in 2014." Prepared for Peach Bottom Atomic Power Station. December 2014.
DATA REPORT ON INTAKE SCREEN SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN 2014 December 2014
DATA REPORT ON INTAKE SCREEN SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN 2014 Prepared for PEACH BOTTOM ATOMIC POWER STATION Delta, Pennsylvania 17314 Prepared by NORMANDEAU ASSOCIATES, INC. 1921 River Road Drumore, Pennsylvania 17518 Normandeau Associates' Project Number 23444. 002 December 2014
2014 Data Report on Intake Screen Sampling at the Peach Bottom Atomic Power Station
1.0 INTRODUCTION
Normandeau Associates, Inc. (Normandeau) was contracted by Exelon Corporation to conduct intake screen sampling at their Peach Bottom Atomic Power Station (PBAPS) during fall 2014. The study objective was two-fold: it fulfills Exelon's obligation to support the Susquehanna River's American shad restoration program as stated in the 2014 annual work plan, and it provides juvenile American shad specimens to the Pennsylvania Fish and Boat Commission (PFBC) for otolith analysis, which compares the overall contribution of hatchery and wild fish to the population. 2.0 METHODS Due to an extended unit shut down for maintenance and refueling, scheduled for mid-October through mid-December, intake screen sampling was scheduled to occur three days per week, (Monday, Wednesday, and Friday), with a two-person crew, from 1to17 October, 2014. A total of8 sampling events was conducted at the outer screen house during this portion of the juvenile American shad outmigration period. Normandeau personnel contacted PFBC personnel throughout the study period to keep them updated on collection/sampling activities. Peach Bottom control room personnel were contacted before and after each sampling event. The intake screens were operated on an as needed basis during the sample period, and for a minimum of 30 minutes prior to each trash bin being pulled from the collection pit and the contents available for sampling. Peach Bottom personnel hoisted the trash bins out of the screen house to facilitate sampling and ensure the safety of the work crew. All fish observed in the trash bins (both Units 2 and
- 3) were identified and counted (if possible). In 2014, sub-sampling of certain species, (gizzard shad),
was not necessary as large numbers of fish or heavy debris loads occurred infrequently throughout the abbreviated study period. Juvenile American shad that were suitable for analysis, (head and body intact), were counted, measured (nearest mm total length), and preserved (frozen) prior to delivery to PFBC personnel. 3.0 RESULTS A total of 8,496 fish of 17 taxa was collected; 4,699 from Unit 2 and 3, 797 from Unit 3 (Table 1 ). Gizzard shad (7,634), channel catfish (395), and bluegill (371) comprised nearly 99% of the total, while all other species combined accounted for 1.1 % of the total fish collected. Other species common in the collections were white perch (16) and comely shiner (16). No juvenile American shad were collected at PBAPS or provided to the PFBC for analysis during this sampling period (Table 2). 4.0
SUMMARY
Intake screen sampling was conducted during the early portion of the juvenile American shad outmigration period in Conowingo Pond. No sampling occurred after October 17, 2014 due to a refueling outage at the PBAPS. At this time, it is uncertain when these juvenile shad moved downstream into Conowingo Pond. A weekly haul seine project conducted by Normandeau for the PFBC, in the vicinity of City Island (Harrisburg, PA) and Columbia, PA, from mid-July through October 2014, resulted in the collection of31 juvenile American shad (24 from City Island; 7 from Columbia). Relatively low, stable river flows occurred throughout the sampling period with no discernible freshets which would move fish downstream. The river water temperature during the 2014 study ranged from 63.5° F to 75.4° F which is relatively warm and may not have triggered the urge for juvenile American shad to begin their downstream migration. No juvenile American shad were collected or provided to the PFBC from sampling activities at the PBAPS in 2014. PBAP~uvAm.sha::l-Dec2014 NormaideaJ Assxiaes, Inc.
Table 1 Number of fish collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 1to17 October 2014. Species Unit2 Unit3 Total Alewife (residualized) 2 5 7 Gizzard shad 4,257 3,377 7,634 Common carp 4 4 8 Comely shiner 9 7 16 Spottail shiner 4 0 4 Channel catfish 238 157 395 Flathead catfish 7 5 12 White perch 7 9 16 Rock bass 0 3 3 Green sunfish 0 3 3 Pumpkinseed 0 1 Bluegill 155 216 371 Smallmouth bass 2 2 4 Largemouth bass 1 2 3 White crappie 6 4 10 Tessellated darter 5 6 Logperch 2 3 TOTAL 4,699 3,797 8,496
Table 2 Number of juvenile American shad collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, I to 17 October, 2014. Date Unit 2 Unit 3 Total OJ Oct 0 0 0 03 Oct 0 0 0 060ct 0 0 0 080ct 0 0 0 IOOct 0 0 0 13 Oct 0 0 0 15 Oct 0 0 0 17 Oct 0 0 0 TOTAL 0 0 0
January 7, 2019 U.S. Nuclear Regulatory Commission ENCLOSURE10 1 O_NAl_2015a.pdf [NAI] Normandeau Associates, Inc. 2015a. "Data Report or Intake Screen Sampling at Peach Bottom Atomic Power Station in 2015." Prepared for Peach Bottom Atomic Power Station. December 2015.
DATA REPORT ON AMERICAN SHAD SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN2015 December 2015
DATA REPORT ON AMERICAN SHAD SAMPLING AT PEACH BOTTOM ATOMIC POWER STATION IN 2015 Prepared for PEACH BOTTOM ATOMIC POWER STATION Delta, Pennsylvania 17314 Prepared by NORMANDEAU ASSOCIATES, INC. 1921 River Road Drumore, Pennsylvania 17518 Normandeau Associates' Project Number 2344./.002 December 2015
2015 Data Report on Intake Screen Sampling at the Peach Bottom Atomic Power Station
1.0 INTRODUCTION
Normandeau Associates, Inc. (Normandeau) was contracted by Exelon Corporation to conduct sampling for juvenile American Shad at the outer intake screens at Peach Bottom Atomic Power Station (PBAPS) during November 2015. The study objective was two-fold: it fulfills Exelon's obligation to support the Susquehanna River's American shad restoration program as stated in the 2015 annual work plan, and it provides juvenile American shad specimens to the Pennsylvania Fish and Boat Commission (PFBC) for otolith analysis, which compares the overall contribution of hatchery and wild fish to the population. 2.0 METHODS After fall refueling outage activities were completed, outer intake screen sampling was performed three days per week, (Monday, Wednesday, and Friday), with a two-person crew, from 2 to 25 November, 2015. A total of 11 sampling events were conducted at the outer screen house during this portion of the juvenile American shad outmigration period. Normandeau personnel contacted PFBC personnel throughout the study period to keep them updated on collection/sampling activities. Peach Bottom control room personnel were contacted before and after each sampling event. The outer intake screens were operated on an as needed basis during the sample period, and prior to each trash bin being pulled from the collection pit and the contents available for sampling. Peach Bottom personnel hoisted the trash bins out of the screen house to facilitate sampling and ensure the safety of the work crew. All fish observed in the trash bins (both Units 2 and 3) were identified and counted (if possible). In 2015, sub-sampling of certain species, (gizzard shad), was not necessary as large numbers of fish or heavy debris loads occurred infrequently throughout the study period. Juvenile American shad that were suitable for analysis, (head and body intact), were counted, measured (nearest mm total length), and preserved (frozen) prior to delivery to PFBC personnel. 3.0 RESULTS A total of 33,410 fish of29 taxa was collected; 12,625 from Unit 2 and 20,785 from Unit 3 (Table 1). Gizzard shad (25,585), bluegill (5,986), and white perch (1,014) comprised nearly 98% of the total, while all other species combined accounted for about 2% of the total fish collected. Other species common in the collections were channel catfish (290) and green sunfish (112). A total of 62 American shad was collected at PBAPS and provided to the PFBC for analysis during this sampling period (Table 2). 4.0
SUMMARY
Outer intake screen sampling was conducted during the November portion of the historical juvenile American shad outmigration period (October/November) in Conowingo Pond. No sampling occurred prior to November 2, 2015 due to a refueling outage at the PBAPS. At this time, it is uncertain when these juvenile shad collected at the PBAPS moved downstream into Conowingo Pond since the weekly haul seine project conducted by Normandeau for the PFBC, in the vicinity of Columbia, PA, from mid-September through mid-November 2015, did not result in the collection of any juvenile American shad. Relatively low, stable river flows occurred throughout the sampling period with no discernible freshets which would move fish downstream. The river water temperature during the 2015 study ranged from 45.9° F to 56.9° F, conducive for triggering outmigration behavior of juvenile American shad. A total of62juvenile American shad were collected and provided to the PFBC from sampling activities at the PBAPS in 2015. For reference, a total of 49 and 0 juvenile American shad were collected and provided to the PFBC from sampling activities at the PBAPS in 2013 and 2014, respectively. PBA~ uvAm. sha:l-0~015 Normaidea.J Ass:x:ictes, Inc.
Table 1 Number of fish collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 2 to 25 November 2015. Species Unit2 Unit3 Total American eel 3 4 American shad 29 33 62 Alewife (residualized) 4 5 Alosa sp. (decapitated) 0 1 Gizzard shad 9,755 15,830 25,585 Common carp 9 42 51 Golden shiner 4 3 7 Comely shiner 64 22 86 Spottail shiner 0 2 2 Spotfin shiner 2 3 Quill back 0 1 Shorthead redhorse 3 4 Channel catfish 150 140 290 Flathead catfish 3 12 15 Banded killifish 13 17 30 White perch 242 772 1,014 Striped bass 2 2 4 Rock bass 4 12 16 Green sunfish 29 83 112 Pumpkinseed 2 2 4 Bluegill 2,286 3,700 5,986 Smallmouth bass 18 19 Largemouth bass 5 29 34 White crappie 5 14 19 Black crappie 2 13 15 Tessellated darter 6 7 13 Yell ow Perch 2 12 14 Ch. Logperch 5 6 11 Walleye 0 2 2 Greenside darter 0 1 TOTAL 12,625 20,785 33,410
Table 2 Number of juvenile American shad collected during intake screen sampling by unit at Peach Bottom Atomic Power Station, 2 to 25 November, 2015. Date Unit2 02 Nov 7 04 Nov I 06 Nov 4 09Nov 6 II Nov 3 13 Nov 0 16Nov 0 18 Nov 0 20 Nov 0 23 Nov 6 25 Nov 2 TOTAL 29 UnitJ 0 13 2 2 I I 4 5 3 33 Total 7 14 5 8 5 1 4 11 5 62}}