ML19064B221
| ML19064B221 | |
| Person / Time | |
|---|---|
| Site: | Peach Bottom  |
| Issue date: | 02/21/2000 |
| From: | Normandeau Associates |
| To: | Office of Nuclear Reactor Regulation, Pepco Services |
| Hayes B, NRR-DMLR 415-7442 | |
| Shared Package | |
| ML19064B212 | List:
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| Download: ML19064B221 (107) | |
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{{#Wiki_filter: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- MONTIILY 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 LIST OF TABLES Table 2-1 Description of thermal mapping locations sampled in the vicinity of PBAPS, June-October
!999.
Table 2-2 Location of electrofishing stations sampled in Conowingo Pond, June-October 1999. Table 2-3 Location of seine stations sampled in Conowingo Pond, June-October 1999. Table 2-4 Location of trap net stations sampled in Conowingo Pond, June-October 1999. Table 2-5 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. Table 2-6 Location of trawl transect stations sampled in Conowingo Pond, JWle-October 1999. Table 3-1 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. Table 3-2 Monthly mean river flow and water temperature at Holtwood Dam, May-October 1952-1998, and in 1995, 1996, 1997, 1998, and 1999. Table 3-3 Joint occurrence of daily water temperature and river flow at Holtwood Dam, June-October 1956-1998, 1997, 1998, and 1999. Table 3-4 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. Table 3-5 Selected weekly thermal profile conditions at locations sampled in Conowingo Pond, June-October 1999. Table 3-6 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. Table 3-7 Selected weekly DO profiles at transect locations in ConO\vingo Pond, June-October 1999. Table 3-8 Scientific and common names of fishes collected in 1998 in Conowingo Pond, June-October 1999. Table 3-9 Number and percent composition of fishes collected by all gear types per month in Conowingo Pond, June-October 1999. Table 3-10 Number and percent composition of fishes collected by DC Electrofisher per month in Conowingo Pond, June-October 1999. Table 3-11 Monthly catch per effort (number per 30 minutes) for fishes collect.ed by a DC Electrofisher in Conowingo Pond, June-October 1999. Table 3-12 Catch per effort (number per 30 minutes) for fishes collect.ed by DC Electrofisher at stations in Conowingo Pond, June-October 1999. Table 3-13 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. Table 3-14 Number and percent composition of fishes collected by 10 x 4 ft seine per month in Conowingo Pond, June-October 1999. Table 3-15 Monthly catch per effort (number per collection) for fishes collected by a 10 x 4 ft seine in Conowingo Pond, June-October 1999. Table 3-16 Catch per effort (number per collection) for fishes collected by I 0 x 4 ft seine at stations in Conowingo Pond, June-October 1999. Table 3-17 Diversity and eveMess values for fishes taken by seine per month in Conowingo Pond, June-October 1999. J999P.BAPS,falrpr.doc
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Report on Thermal Conditions and Fish Populations in Conowlngo Pond Relative to Zero Cooling Tower Operations at PBAPS, 1999 Table 3-18 Index of percent similarity of species composition between seine stations during zero tower operation in Conowingo Pond, June-October 1999. Table 3-19 Index of percent similarity of species composition per month in Conowingo Pond, June-Octobcr 1999. Table 3-20 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. Table 3-21 Number and percent composition of fishes collected by trap net per month in Conowingo Pond, June-October 1999. Table 3-22 Monthly catch per effort (number per 24 h) for fishes collected by trap net in Conowingo Pond, June-October 1999. Table 3-23 Catch per effort (number per 24 h) for fishes collected by trap net at stations in Conowingo Pond, June-October 1999. Table 3-24 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. Table 3-25 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. 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. Table 3-27 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. Table 3-28 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. Table 3-29 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. Table 3-30 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. Table 3-31 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. Table 3-32 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. Table 3-33 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. Table 3-34 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. Table 3-35 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. Table 3-36 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 LIST OF FIGURES Figure 2-1 Thermal profiling locations in the vicinity of PBAPS. Figure 2-2 Map of Conowingo Pond showing distribution of electrofishing stations. Figure 2-3 Map of Conowingo Pond showing distribution of seine stations. Figure 2-4 Map of Conowingo Pond showing distribution of trap net stations. Figure 2-5 Map of Conowingo Pond showing distribution of stations in trawl zones 405 and 408. Figure 2-6 Map of Conowingo Pond showing distribution of stations in trawl transects 2, 4, and 7. Figure 3-1 Duration curve of average daily river flows at Holtwood Dam in June-October 1952 to 1998 and in 1997, 1998, and 1999. Figure 3-2 Duration curve of daily average river temperatures at Holtwood Darn in June-October 1956 to 1998 and in 1997, 1998, and 1999. Figure 3-3 Weekly mean percent of power output and condenser AT at PBAPS, June-October 1999. Figure 3-4 Weekly mean temperatures at Holtwood Dam and PBAPS inlet, June-October 1999. Figure 3-5 Average daily condenser outlet and canal outfu.11 temperatures at PBAPS, June-October 1999. Figure 3-6 Weekly mean canal outfall AT at PBAPS, June-October 1999. Figure 3-7 Weekly mean surface and bottom DO at transects sampled in the vicinity of PBAPS, June-October 1999. Figure 3-8 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
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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 llT 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 PADEP 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 J0 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 I0 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;Log1 P; 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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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 ofPBAPS 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 ofPBAPS 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 s
Wmiam Tunnel Transect (located approximately 1. 2 mile downstream ofPBAPS 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 ofPBAPS 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 Location Zone 405 451 & 452 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. 453 & 454 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. 455 &456 From a point off PBAPS Unit l to a point just above PBAPS Units 2 and 3. Zone 408 481 & 482 From a point approximately 300 yards below Peach Bottom Beach to a point off Peach Bottom Beach. 483 & 484 From a point off Peach Bottom Beach to a point off the fonner lchthyological Associates dock. 485 & 486 From a point off the former Ichthyological Associates dock to a point off the mouth of Peters Creek. Table 2-6 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 F"'tshin g Creek Muddy Creek Roll ins Johnson L Peach Bottom Creek Station Stonewall Paint ~-161 Peach Bottom Beach Williams Tunnel Tunnel N Glen Cove 0 1 t 2 Conowingo Figure 2-2 Map of Conowingo Pond showing distribution of electtofishing stations.
Muddy Run Recreation Lake Muddy Run Pumped Storage Pond Power Plant Fishing Creek Muddy Creek Roi I ins Johnson I. Peach Bottom Peters Creek Station Peach Bottom Beach Frazer Tunnel Broad Creek Creek. Glen Cove 0 1 2 3 Scale In Miles Conowingo Figure 2-3 Map of Conowingo Pond showing distribution of seine stations.
Holt wood Run Recreation Lake Dam Pumped Storage Pond Fishing Creek Muddy Creek Roll ins Johnson L Peters Creek Peach Bottom Beach State Line _P_a_.._ __;..M..;..i:..::c:.:..:h::a:.::el Md. Frazer Tunnel Run Glen Cove 0I 1I 2I 3I Scale In Miles Conowingo Figure 2-4 *Map of Conowingo Pond showing distribution of trap net stations.
Run Recreation Lake Muddy Run Pumped Storage Pond Fishing Creek Muddy Creek Roll ins Beach Tunnel State Line _P_a=*--.....:.tvf....;.;.;ic~h:.:.:::.a~el Md. Broad Creek Run 0I 1 2I 3t Glen Cove I Scale In Miles Conowingo 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 Fishing Creek Muddy Creek Roll ins Johnson I. Peach Bottom Creek Station Stonewall Peach Bottom Beach Williams Tunnel State Line ....P...;a;;.;.*-~M...:.;i::.;:c:.:.;h:.:::a:.::.el Md. Tunnel Broad Glen Cove 0 1 2 3 Scale In Miles 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 PNMD 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 AT'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 (0 f) 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 (0 f) 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. 0 O::ailv A\'erai;e Tempcratun: ( " - - - - - - - - - - - - Daily Average 40-49 50-59 60-69 70-79 80-85 >liS Total River Flow (crs) No. Pct. No. Pct. No. Pct. No. Pct. No. Pct. No. Pct. No. Pct. 1956-1991
<2,SOO 8 0.12 11 0.17 10 0.16 9 0.14 38 0.59 2,.S00-4,999 22 0.34 102 l.S9 219 3.42 277 4.33 108 1.69 728 11.37 S,000-1,499 S9 0.92 170 2.65 283 4.42 334 S.22 138 2.15 984 IS.37 7,S00-9,999 35 0.55 151 2.36 267 4.17 361 S.64 71 I.I I 885 13.82 10,000-14,999 67 I.OS 174 2.72 481 7.Sl 479 7.48 41 0.64 1,242 19.39 15,000-19,999 49 0.77 116 l.81 461 7.20 228 3.S6 7 0.11 861 13.44 20,000-29,999 0,02 42 0.66 124 l.94 483 7.54 138 2.lS 1 0.02 789 12.32 30,000-39,999 19 0.30 71 Lii 227 3.54 42 0.66 3S9 S.61 40,000-SO,OOO 2 0.03 27 0.42 34 0.53 103 1.61 13 0.20 179 2.80
> .S0,000 20 0.31 74 1.16 119 1.86 118 1.84 8 0.12 339 S.29 Total 23 0.36 394 6.15 1.069 16.69 2.653 41.43 J,890 29.51 375 5.86 6. 404 J()(), 00
< 2,SOO 0 2,500-4,999 0.65 6 3.92 7 4.58 S,000-7,499 7 4.58 17 11.11 16 10.46 IS 9.80 s 3.27 60 39.22 7,S00-9,999 4 2.61 11 7.19 14 9.lS 2 1.31 31 20.26 10,000-14,999 s 3.21 6 3.92 16 10.46 0.65 28 11.30 15,000-19,999 10 6.S4 3 1.96 13 8.SO 20,000-29,999 3 1.96 4 2.61 7 4.58 30,000-39,999 3 1.96 3 1.96 40,000-SO,OOO 2 1.31 2 l.31
> 50,000 2 1.31 2 1.31 Total 0 7 4.58 37 24.18 47 J0.72 54 35.29 8 5.23 153 100.00
< 2,500 0 2,S00-4,999 22 14.38 2 1.31 24 15.69 S,000-7,499 3 l.96 8 S.23 7 4.S8 22 14.38 2 1.31 42 27.45 7,500-9,999 9 S.88 2 1.31 13 8.SO 24 lS.69 10,000-14,999 s 3.27 10 6.54 l.S 9.80 IS,000-19,999 s 3.27 4 2.61 0.6.S 10 6.54 20,000-29,999 2 1.31 11 7.19 6 3.92 19 12.42 30,000-39.999 2 1.31 10 6.54 3 l.96 IS 9.80 40,000-50,000 2 1.31 2 l.31 4 2.61
> so.ooo Total 0 3 1.96 31 20.26 58 37.9J 59 38.56 2 1.31 /SJ JOO.DO
< 2,500 3 1.96 3 l.96 2,500-4,999 12 7.84 28 18.30 40 26.14 S,000-7,499 27 17.65 IS 9.80 0.65 43 28.10 7,500-9,999 0.65 9 5.88 2 1.31 12 7.84 10,000-14,999 10 6.54 6 3.92 16 10.46 IS,000-19,999 s 3.27 8 5.23 2 1.31 IS 9.80 20,000-29,999 I 0.65 12 7.84 I 0.65 14 9.IS 30,000-39,999 4 2.61 l 0.65 .s 3.27 40,000-S0,000 2 1.31 2 1.31
> S0,000 2 1.31 l 0.65 3 1.96 Total 0 17 11.JJ 28 J8.30 59 38.56 48 31.37 1 0.65 J53 JOO.DO 1999/'BAl'S.fnlrpt/T'b 3.3
- 2121/00
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 11T (°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)
Wttkar 10 June* II July 15 Ju1r IAu1ust ll Aueust* Dtrtb W M I!: W M E W M E W M ! W M E IV M E IV I £
*1.4 -0.I -0.4 *2.1 -0.1 -0.1 *2.1
*l.1 *I. I -0.4 *U *l.S -0.6 *1.6 O.D 1.3 *2.3 0.4 *O.l *H *1.6 *l .O -0.I -0.3 -0.1 *1.0 -0.6 -0.6
. 29 *l.l *2.9 . 1.5 -0.6 *l.I -0.l -2.3 0.4 -H -1 ,6 *0.5 -0.4 .1.5 *I.I -0.1 10 .34 *2.9 -1.0 *2.0 *1.1 *2.l 0.4 *2.1 -0.I *1.6
- I.I IS -3.6 *2.9 Bo,_ *3 6 *l.3 *4.0 *l.9 -1.9 -1.0 *2.1 -2.3 0.4 *2.3 -07 *0.7 *2.1 *2.3 -4. I -0.6 -0.4 -0.6 *1.6 *I.I -0 I 16.2 !l. I 14.t au 7U 65.1 5U 19.1 19.7 19.6 19.6 19.I 23.1 14.7 Bw,4fru Riot 11 9 .. . s .t.4 111 l9 I1 11.9 4.1 31 IJ.9 6. 7 6.1 9.5 0.1 1.6 11.6 0.6 0.6 7.1 04 -0,4 10 t l.I 101 l5 11.9 4.2 13.0 1.3 I.I O.l 10.l 0.6 7.3 0.3 10 93 1.0 19
- 11 10.4 0.4 6.1 0.0 15 -1 .2 -0.5 Donom 9o *1 .2 3.5 79 *l.4 I1 9.l 1.6 l.O 12.1 -0.1 4.7 I.I
- I.I 1.4 4.0 -0.2 0.3 6.3 0.0 -0 1 Jf.'11liolft1 ruftMI I. I 6.7 S.I It 0 3,9 9.6 6.5 4.1 9.4 *3 6.7 l.l 6.1 l .9 1.9 t .I I.I H 1.6 ll u 63 u 66 0 )9 1.3 6.3 4.7 76 7I 6.l 7.0 ' *' l .7 1.7 0.1 0.7 1. 5 I.I 1.2
\0 1.7 4.6 I.I 16 35 LI I .I U 41 I .I 49 4.9 5.7 u 4.1 1.0 -0. I 0.1 0.7 U.I 1.2 15 40 4.0 2.1 3.1 2.9 1.2 2.1 2.3 0.2 -0.1 0.7 0.1 0.9 20 0.7 1.4 -0.1 l.l 2.0 0.1 21 *1.7 0.4 01 Bottom 0,0 -0.1 -0.4 17 l.l -19 l.O 2.1 *l.7 3.1 0.9 -0.1 0.7 1.4 0.3 0.2 -0.l -OJ 0.1 0.1 0.6 PAI/JD si,,,. t.... 3.9 4.0 4.2 ll 2.1 11 16 u 4.1 1.1 *.o 4.o 5.3 4.3 4.0 I.I U 4.2 4.2 3.1 1.]
36 3.1 3.7 11 11 2.1 I .I 4.6 U 4.0 3.1 3.6 u 4.3 4.0 3.1 3.7 l.6 4.1 u 23 10 3.6 3.5 u ll 11 19 4.7 '-4 4.l 3.s 33 3l 4.1 0 3.9 1.3 I.I 1.7 3.7 3.1 13 I! 3.6 2.5 19 1.7 .., l.1 3.1 3.1 2.7 42 3.7 0.7 2.4 3.3 26 2.3 10 l.2 0.2 1.1 2.9 2.t 1.1 u ).) 0.3 l .l 3.3 1.9 25 0.3 30 35
-0.6
*I.I
-1.S
*II
-13 I. I
-0.1
-0.9 l.2 1.1 l.l 1.1 1.2 0.9 0.6 I.I 1.6 1.6 40 *I 3 *l.3 I.I I .I Bonmn O.J 26 *I.I I4 1.9 *1 .3 1.4 I.I -0 3 u l .1 0.9 16 3.7 0.4 0.1 I.I 0.0 J.I 13 .,
- Filll-lin&lll""')'Mdt
** Tho - tcmp<falllra ("f) . - - d .. ""'PBAPS Inlet (lnoludcd r..... r.._.i 199'11'/JAP$/~ J.J.1-1/ZllOO
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.
\\ttkof 10 June:* II July 8 Aaaust 19 5'ptnnbrr* 14 Octotwr*
Dtplh W M E W M E W M E W M E W M f. W M E W M t 0 16 u 9.4 6.0 7.3 14 l.D 1.0 7.4 6.1 1.2 6.6 6.9 7.1 1.7 1.2 I.I 10.1 10.0 10.0
' 70 1.6 !.9 7.3 u 70 7.9 6.9 11 6.! 6.9 B.6 1.2 10.0 99 10.0 10 6.6 7.7 !.9 7.1 12 6.7 7.7 6.9 79 6.4 IS l.l 10.0 9.9 u 6.J !.I 6.9 6.4 10.0 eon.... 6o ! .I 102 ! .7 7.1 1.1 6.2 5.6 7.l 6.9 6.6 I.I 6.4 S.I 7.1 1.5 1.2 I.I 10.0 10,0 99 Buriiru R11n 7.6 l.J 1.3 7.1 7.1 69 7,1 6.4 7. 1 1.0 7! 1.6 7.2 7.1 7.l 1.2 12 I.I 9.9 91 10 I 7.7 6.S 7.1 7.0 7.2 6.1 1.0 6.9 7.1 6.1 1.2 K.2 9.9 9.7 10 7.1 7.1 6.4 70 8.0 1.l 9.9 9.7 73 Bonom 79 ! I 6.1 7.1 6.1 6.9 7.1 S.l 6.0 1.0 7.1 6.6 7.0 6.0 6.4 1.0 7.1 10 9.9 9.7 10.1 7.1 7.1 7.4 7.1 6.1 6.9 6.1 6.9 7.1 9.0 1.4 9.D 7.1 7.2 7.2 1.4 1.5 16 9.1 !J.7 9.1 6.1 7.0 7.J 6.1 6.7 6.1 6.6 6.1 6.1 1.6 1.0 I.I 6.1 6.9 7.1 14 1.5 1.6 9.7 '1 9.1 10 6.1 6.9 7.1 6.0 6.! 6.6 6.3 6.1 !.9 7.1 1.0 I.I 6.1 6.9 6.9 1.4 l.J 1.6 9.6 9.6 9.1 U S.I S.I 6.4 6.1 4.7 l.6 4.! 6.! 6.7 l.S 1.6 9.6 9.S 9.1 20 4.1 56 2.7 S.4 I.! 9.6 2S 1.0 46 2.2 s.o I.! 96 Donom 3.4 4.0 3.5 45 !.9 37 2.9 3.2 1.2 6.1 s.o 4.1 !.4 S.3 S.! IO 1.1 l.J 9.7 9.! 9.S PAMD Stat* LtrM 1.7 l.J 7.7 7.0 6.7 66 7.2 6.6 7.0 9.4 16 1.7 7.4 7.2 7.2 I.! 1.7 1.7 9.4 9.6 9.!
1.S 1.2 7.7 6.7 6.6 6.S 6.9 6.1 6.1 1.0 IS 1.6 7.l 7.2 7.1 1.4 1.6 16 9.4 !t.6 9.S 10 1.0 I.! 7.4 6.6 6.6 6 .) 6.4 !.9 6.1 1.0 79 7.6 7.2 7.0 7.0 1.3 1.4 1.6 9.4 9.S 9.S u 7,7 6.! ,. 6.4 6.1 6.2 !.! 7.0 6.9 6.4 7.2 6.4 6.6 I.! 1.1 1.6 9.3 9.! 9.! 20 S.J 4.0 6.1 l.3 4.0 3.9 6.1 I.! 9.2 9C 2S 2.9 6.1 1.6 3.1 6.0 I.! 94 30 n 2.4 2.2 H 4.3 1.6 0.6 3.5 3.9 '*' 1.4 IS 94 93 40 Booom 2.S !.I 2.0 1.9 !.4 6.4 4I 39 l2 u 0.1 1.4 JS 6.1 4.0 l9 !.3 IJ 10 u 1.2 9.2 ,_, 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. iI _ _ _ iI _ _ _ _ _ _ i I _ _ _ _ _ _ JI _ _ _ _ _ _ JI _ _ _ _ _ _ JI _ _ _ _ _ _ JI _ _ _ _ _ _ JI _ _ _ _ _ _ 4I _ _ _ _ _ _ 41 _ _ _ _ _ _ 4I 45000 I I I I I I I I I I I I I I t t F I I I I I I I I I I 40000 t-~---7------f------7----- ---- -~------~------i------~------~------~ L I .,. \ I I I I I I I I I I 0 35000 +--t-~\.- :-- ----+------+------+------+------+------+------~------+------~ I I I I I I w 30000 ~ - - - , .... : ~ - I tf I
----~------4------~ ------ ~ - -----~------~------~------~------~
I I I I I I I I I 25000 + I
' ----!.-+ '
I I I I I I I I I I . \ : I .
-~------~------~------~ -- ----~------~------~------~------~
I t I I I N 20000 +--- --- ~ ------ ~-
- : ~ * * *:
- 1
------~ - -- - --~ - -----~------
I I ' I 15000 ~----- - ~ ---- ~ - ~-~--'}.. I I I" " I ' __ _ I I
--~------~------,------~
c 10000 ~ - - - - - - ~ - - - - - - ~ - .:-:-: -*: ~ - ~ ---'":;:...."*"'---...::. - - ~ - - - - - - -- - - I I I I *1 * - - ~--==::r- I "T - I
- - - - - ~ t
- - - - - - ~ - - - - - - ~
F I I I I I * * *
- I * * *~-- I I
~ - - - - - - +- - - - - - f - - - - - - ~ - - - - - - ~ - - - - - - ~ - - - ~ - : ~-- ~ -~- 1' - - --- .;::;_;:;_~-.~::===-~:==:-:...O-;;::;;;;:: - -{
I s 5000 I I I
- t * "' .. *'
I I I 0 T------T------,------T------,------1 I I I I I I
- -----1------1------1------ 1------ ,
I I I I I I I I 0 10 20 30 40 50 60 70 80 90 100
%TIME EQUAUED OR EXCEEDED YEAR 1952-98
- 1997 - - 1998 1999
Figure 3-2. Duration curve of daily average river temperatures (0 F) at Holtwood Dam, in June - October 1956 to 1998 (histoncaO and in 1997,1998, 1999. f I I I
.I I I I I I I
95 . r - - - - - - 'T - I I
- - - - - r - - - - - - , - - - - - - -,- - - - - - - r - - - - - - , - - - - - - -,- - - - - - - r - - - - - - ..,
I I I I I 1 LL I I I I I I I I I I l I I w 90
- I l
- - - - - - ..l. - - - - - - - - - - - - &- - - * - - - - -L -
I I
- - - - - 4- -
I I
- - - - - .i.
I
- - - - - - ~
I CI I I I I
- J 85 - - - - - -
I
-I - - - - - - -
I I I I
- - - - - - I - - - - - - - - - - - - - - I - - - - - - "'i - - - - - - -
I I- - - - - - - I I - - - - - - -. I
~
- I I
I I I t ffi 80 I t'- - - - - - - "f * - I I
- - - - - - t-I n. ~
w 75 I-I I I I I I I 1* ' CI I I I I I I I I I 70 ~ :- - - - - - - ~ - - - - - - -:- - - - - - - ~ - - - - - - ~ - - - - - - -:- - - - - - - ;_ - - - - - - -r ~ I I I I I I *
~-c. ------ ~ -------!
t""'"- I I 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 :- - - - - - - I "t - I I
- - - - - r- -
I
- - - - - ~I - - - - - - -:- -
I 1
- - - - - ~I - - - - - - -~-I
- - - - - - ~I - - - - - - -..
I 1 1 1 I 11 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 .
~ 16 t..
- 140 t>
=
Q,
- i 0
41 120 14 0
~
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. J999PBAPS/"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 95 Ii:' e..
~
=
ex. 90
..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 (0 F) at PBAPS, June-October 1999. / 999PBAPS,fnlrpt!Fg1 J.J,4,3,6. 2111/00 Norma11d1nu Auoclot*,. ltte
24 - 22 20 18 - 16 E
'!!"" 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 0 F) at PBAPS, June-October 1999. 1999PBAPSfnlrptlF1* J-1,4,J,6- 2121/r>O NannantJ.av A11ocla111, /nc.
11.0 SURFACE DO
!0.0 9.0 8.0
~
,g_ 7.0 g
6.0 50
...,._Fishing Creek ...,._Burkins Run 4.0
..._Williams TuMel -State Linc 20 Jun 4Jul 11 Jul 18Jul 2S Jul I Aug 8 Aug IS Aug 22 Aug 19Sep 240ct 1999 (Wttk of) 12.0 -r----------------------------------------,
BOTTOM DO
-e- Fishing Creek _.,_Burkins Run 10.0 r - - - - - - - - - - - - - i ...,_Williams TUIUICI -State Linc 8.0 u
,g_ 6.0 0
Q 4.0 0 . 0 - - - - - - - - - - - - - - - - - - - - - - - - - - - - . . - - - - - - - - - - -.......-~--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 12.0 SURFACE 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 13.0 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 11.0 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. 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 371 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 Bullhead catfisheJ, continued Alosa sapidiulma Amencan shad Ameluros natali.* Yellow bullhead Dorosoma c*pedianum G17.7.ard shnd Amriuros nrb11/osus Brown bullhead
/eta/uni.* p1111cto111s Channel catfish Cyprinidne Cnrp* nnd minnows Camposroma a110111a/11m Central stoncrollcr Cj71rinodontidat Klllinshu Cli11os1011111s f1111du/0tdts Rosys1dc dace F1md11/11,r diaphmms Banded k1lhfish Cn1rin11s cmpio Common corp Notropis b11ccat11s S1lvcrJDW mmnow Pm:ichth.1*/dae Temperate baueJ Eroglosrnm 111axi/li11g11a Cuthps mmnow Marone americana Wh1teperch Nott111igrm11s c1ysolr11cas Golden shiner M soTatilis x M cl11ysops Sir 1ped bnss x while bas Notropls amot1111s Comely shmcr l.wcilus corn11111s Common shiner Cttnlrarchidne Sunlhhu Not1'0pls lt1uhm1/11.r Spoltatl shmer Amblop/i/~s mp~.wu Rock bass Not1'0pis pl'Ocn* Swallowta1l shincr lepomis sp Lepom1ssp Notropis robe/lus Rosyfocc !hmer upomis auritus Redbreast sunfish Cyprinel/n spi/opt*ra Spolfin shiner uponrls cyon~/1111 Green sunfish Notropls \'0/11cellus Mimic shiner upom/J gibbos11s Pumpkm1Ced Pimeplrales noratus Bluntnose minnow upomis 111acroc/1i111s Bluegill Rltinichrhys atrawlus Blacknose dace Micropt~rvs dolo111ie11 Smollmoulh bass Rhiniclttlrys cataractae Longnosc dace MiCl'opteros salmaid~s Largemouth bass Semol//us otro111ac11/atus Creek chub Pomoxis annularis White crappie Sematilus corpora/is Fallfish Pomoxls nlgronrac11/at11s mack crappie Catostomldat Sue ken Pucidae Perches Cmpiodes cyprinus Quillback Ethtostoma blenniordts Greenside darter Catostomus commersoni White sucker Etheos/01110 olnllltdi Tessellated darter llypente/ium nigricamt Northern hogsuckcr Ptrcajlawsctns Yellow perch Moxostoma mocroltpidatum Shortheod rcdhorsc Perclna caprodu Logperch Ptrclna pttltala Shield darter
/Clahlrldat Bullhead catnshu Stlzosttdlon vUnum Walleye Ameluros catus W1Utec11tfish
/999P/UPS.fal'7'11Tb U
- 2nl/OO
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/l1100 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 Ycllow 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 Quillback 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 ofspecies 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 Quillback 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 ofS£!.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 Post-opcntional 7
7 0-1.71 0-1.62 7 O.Sl-6.01 0.22-4.00 7 0.21-17.7S 1.20-4.00 I 7 0.14-37.60 0.57-10.90 I 0-9.71 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 Quillback 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 ofspecies 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 Quillback 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 Ycllow 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 Ycllow 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 ofspecies 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 Post-opcntional 1 6 0.18-294.24 9.70-117.36 IS 0.00-IS6.33 1.25-18.83 8 IS U0-131 .67
- o. 00-180.26 7
IS 2.00-278.81 0.14-220.15 16 7 6.S7-933.IO
- 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 P0tt-opcntioml 6
6 0.06-2.75 0 15 0.00-22.55 O.oo.G.33 8 15 0.00-18. 13 0 .00-5.51 7 IS 0.01-21.33 O.oo-6.lS 1 16 0.00-17.75 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 0 .00 1999 0.00 0.21 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 Ycllow 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 ofspecies 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 olSf!!.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
~liooal 2 0 GU.utnl*"""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 Amcrican 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 1997 7 1.00 0--0.09 7 li..11 0-3.31 0.30.11.08 24.44 1 0.25-13.92 7.56
- I.II 0-9.63 1998 0.78 11.14 2.25 3.44 2.00 1999 1.11 J.22 0.11 0.33 2.22 Pre-opcralional 2 Gi::Md ""'
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-""'"- 6 0.00-0.JO l'R-opmuional 2 0.03 6 0.00.0.JS 6 0.00-0.08 6 0.00-0.04 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 J974; 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.
Duration curve of average daily river flows at Holtwood Dam, 1952 to 1997 {historical), 1997, 1998 and 1999. MONTHaJUNE r--- I I I I 80000 --,------,------~------~-------~------~------r------r------T------, I I I I I I I I I I I I I I I I I I 70000 -1. I
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I
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I
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r - - - - *- I I I I
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... ------~------~------~-------~------~------~------L 1 I I -- -
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I 40000 T I I I I I I I I I I I r - - - - - - r - - - - - - r - - - - - - 1 I N 30000 ...I I - -----r-..-.-..- ~ -:- -- - -- - -- -- - - -- - - - - ;*' -- - --
~ ~ ~ .1..------..i I I c I I
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I I I 0 10 20 30 40 50 60 70 80 90 100 X TIME EQUALLED OR EXCEEDED YEAR 1952-98 1999 1997 - - 1998
Duration curve of average daily river flows at Hallwood Dam, 1952 to 1997 {historical), 1997, 1998 and 1999. MONTH,.JULY 80000 i~ ------ ~ ------~ ------ ~ -------!- -----+------;- ------~ ------~ ------~ ------~ 70000 3~ - - - - j - - - - - - J------ J_-----_:_-----_:_ ------:_ ------ ~ ------ ~ ------ ~ ------ j
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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
Duration curve of average daily river flows at Holtwood Dam, 1952 to 1997 {historical), 1997, 1998 and 1999. MONTH*AUGUST I 80000 T---- I I ______ , I "f - ---r------~------r------ I I I I I I I I
.J. _ _ _ _ _ _ ' I 70000 ..1 - - - - - - ...J - - - - - - _, -
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" 100
% TIME EOUALLEO OR EXCEEDED YEAR 1952-98 1997 - - 1998 1999
Duration curve of average daily river flows at Holtwood Dam, 1952 to 1997 (historical), 1997, 1998 and 1999. MONTH= SEPTEMBER I _ _ _ "T ___ _ I I 80000 .. T - I I I
---r------~------r------T------~
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0 10 20 30 40 50 60 70 80 90 100 X TIME EQUALLED OR EXCEEDED YEAR 1952-98 1997 - - 1998 1999
Duration cunre of average daily river flows at Holtwood Dam, 1952 to 1997 (historical), 1997, 1998 and 1999. MONTH=OCTOBER 80000 , '
---,------..,- ' -,- - - -r------r------r-I I I r' - -T------, I I
l ' 1 I _..J _ _ _ _ _ _ _._ ' ' o I 70000 I I
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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 I I I 40000 -----,------,------~-------~------~------~------r------T------, I I I I I I I N I I 30000 - - - - - - - - - - - ,_ - - - - - - ""- - - - - - - '- - - - - - - '- - - - - - - .a. - - - - - - """
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~
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1-r I 0 10 20 30 40 50 60 70 BO 90 100
~ TIME EGUALLED OR EXCEEDED YEAR 1997 1952-98 - - 1998 1999
Duration curve of average daily river temperatures (° F) at Holtwood Dam, 1956 to 1997 {historical), 1997, 1998 and 1999. MONTH .. JUNE w I I I I I A 100
, - - -, - - - - - - - r - - - - - *- T - - - - - - .., - - - - - - - - - - r - - - - ... , - - - - - - -1 I I I I I I I I I I I I I I t T 95 ..., -
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% TIME EQUALLED OR EXCEEDED YEAR 1956-98 1997 - - 1998 1999
Duration curve of average daily river temperatures {0 F) at Holtwood Dam, 1956 to 1997 {historical), 1997, 1998 and 1999. MONTH*JULY w 100 TI
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Duration curve of average daily river temperatures (° F) at Holtwood Dam, 1956 to 1997 (historical), 1997, 1998 and 1999. MONTH*AUGUST w 100 T - - - - - - I l I
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% TIME EQUALLED OR EXCEEDED YEAR 1956-98 1997 - - 1998 1999
Duration curve of average daily river temperatures (° F) at Holtwood Dam, 1956 to 1997 (historical), 1997, 1998 and 1999. MONTH*SEPTEMBEA w I I I I I I I I A 100 -r - - - - - - ., - - - - - - I
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~ TIME EOUALLEO OR EXCEEOEO YEAR 1956-98 1997 - - 1998 1999
Duration curve of average daily river temperatures (° F) at Holtwood Dam, 1956 to 1997 {historical), 1997, 1998 and 1999. MONTH=OCTOBER w 100 T I
- - - - - - 1 I
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I I I I I I I I ! I 80 -r - - - - - - 1 - - - - - - --,- - - - - - - r - - - - - - r - - - - - - .., - - - - - - -,- - - - - - - r- - - - - - - T - - - - - - -, - - - - - - -, T ' I I : : I : I I I 75 - - ......,_-, - - - - - - -,- - - - - - - I - - - - - - T - - - - - - I - - - - - - -,- - - - - - - I - - - - - - T - - - - - - , - - - - - - -1 E ,---....- '-- : : : : : :r - : : : M 70 - - --;--..;:;..::: - - - r - - - - - - T - - - - - - , - - - - - - -,- - - - - - - - - - - - T - - - - - - ; - - - - - - -, p 65 E 60 R 55 A T 50 u 45 A 40 E F 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 re TN HOLTWOOD N PCTN
" PCTN
" PCTN H H PCTN H PCTH N PCTN 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 1 500*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 1 000 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 I91111 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 1 000 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 TOTAl N PCTN N PCTN N 'CTN N PCTN N PCTN HOLTWOOD DAILY AVG FlOW I0,000*14 1 099 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 1 000 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 HOLlWOOD 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 1 000*14 1 D9D 10 32.28 10 32.28 15 1 000*111 1 0911 I 3,23 1 a.211 2 11.-45 20 1 000*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 DAILY AVG I 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}}