ML20134M811

Environ Monitoring Rept,Jan-May 1985,for Sc Dept of Health & Environ Control

ML20134M811
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Issue date:	08/31/1985
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ENVIRONMENTAL MONITORING REPORT 1 JANUARY THROUGH MAY 1985 l FOR THE SOUTH CAROLINA DEPARTMENT OF HEALTH AND ENVIRONMENTAL CONTROL i

1 AUGUST 1985 i

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1 Dames & Moore i

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l l ENVIRONMENTAL MONITORING REPORT JANUARY THROUGH MAY 1985 I FOR THE SOUTH CAROLINA DEPARTMENT OF ,

HEALTH AND ENVIR0!.?! ENTAL CONTROL l l

AUGUST 1985  ;

Dames & Moore h i Job No. 5182-108-09

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SUMMARY

The V.C. Summer Nuclear Station (VCSNS) environmental monitoring pro-grams were designed to meet the licensing requirements of the Nuclear Regulatory Commission (NRC) and the requirements of the National Pol-lutant Discharge Elimination System (NPDES) permit issued by the South Carolina Department of Health and Environmental Control (SCDHEC). The purpose of the operational environmental monitoring program was to assess the thermal ef fects of VCSNS on the biota in Monticello Reser-voir. Power testing of the VCSNS began in October 1982 and waste heat was discharged to the reservoir throughout the period of January 1983 through December 1984. The operational history of the VSCNS is pre-sented in the Environmental Monitoring Report (Dames & Moore, 1985).

A detailed description of the history of the reservoir, collecting stations, and other pertinent information was reported in a series of earlier Environmental Monitoring Reports (Dames & Moore, 1978; 1985).

This report includes a summary of larval fish data collected during the study period J anuary through May 1985. The results indicate that the fish are spasning slightly earlier in the season when compared to baseline and operational data. This change in timing of reproduction seems to be directly related to the heated water effluent from the nuclear plint. Spawning temperatures were reached earlier in 1985 than in previor a years (including 1984 when induced early spawning was first noted). the 1985 early spawning was most apparent in white bass, the first species to appear in January and February. In Match larval shad and per h were noted while minnows, suckers, bream, and crappie larvae were col lected in April. In May the threadfin shad, was collected as larvae fo/ the first time in the history of the project. Larval fish were collected throughout the reservoir f rom March through May with no apparent preference for thermally or non-thermally influenced stations.

No dramatic or unusual changes in larval fish density or diversity were observed when compared with data from previous years (Cames & Moore, i

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1978 through 1985). There was no apparent ef fect of the heated ef flu-ent on the dissolved oxygen of the reservoir. The water temperature was elevted slightly (only in the immediate area of the thermal dis-charge).

Conclusions The discharge of heated water during operation of VCSNS has had few effects on the larval fish of Monticello Reservoir. The only part of the reservoir af fected by the VCSNS was the area between the discharge canal and Station K on the eastern shore of the lake. The only notice-able effect of these thermal additions was an induced early spawning of one species of fish, white bass, during January and February, and shad and perch during March (Table 1). During the study there was no sign of oxygen depletion or low dissolved oxygen levels in the thermally affected areas. Information collected during 1985 compares favorably with 1984 data (Dames & Moore, 1985) and supports these conclusions.

Concluding Statement The overall results of the operational phase of the monitoring program indicate that the discharge of heated water from the VCSNS has had few effects on the larval fish. The effects that did occur were very localized and affected only three species of fish.

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I LIST OF TABLES l

TABLE _Page 1 Monthly densities of larval fish (number /100 m 3 ) 13 collected in net tows, January through May 1985 2 Mean density of larval fish (number /100 m3 ) for 16 Stations I through O during January through May 1985 3 Water temperature and dissolved oxygen, in situ 17 measurements, January through May 1985 4 Average circulating water discharge temperature (*F) 19 at the Virgil C. Summer Nuclear Station, January through May 1985 LIST OF FIGURES FIGURES 1 Ichthyoplankton sampling stations 20 2 Average megawatt hours thermal generated at the 21 Virgil C. Summer Nuclear Station during January ,.

through May 1985 I

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l i l l I The regulatory requirements for the FPSF and the VCSNS included areas of overlap in monitoring requirements. Therefore, when the FPSF began cperation in 1978, the various monitoring studies were combined. The specific requirements met by this joint investigation included:

• Post-operational, five year, study for FPSF, required by Federal Energy Regulatory Commission (FERC).

• NPDES permit requirements for VCSNS, required by SCDHEC. i

• Final pre-operational report for VCSNS, required by SCDHEC 1 and the Nuclear Regulatory Commission.

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2.0 OBJECTIVES As part of the operating license requirement for the VCSNS, as stipu-laced in the NPDES permit, larval fish sampling wa s required by the SCDHEC during 1985. The purpose of the sampling wa s to determine potential effects of thermal discharges on reproduction of fish in Monticello Reservoir. The collecting period during 1985 was important since the VCSNS was not in operation during part of the same time period in 1984. Therefore some of the information reported herein was collected during the peak spawning period for some species of fish. In addition, these data will supplement information collected during the previous year (Dames & Moore,1985).

Ichthyoplankton, comprised of the egg and larval component of fish, are of fundamental impo rtance in assessing fishery success fo r two reasons:

1. Ichthyoplankton are the products of a specie's reproductive efforts; therefore, ichthyoplankton abundance and survival bear directly on the reproductive success of a specie.

2. Ic hthyoplankton , particularly of forage species such as giz-l zard shad, provide a valuable food resource to a number of desirable fish species.

The seasonal abundance of ichthyoplankton is a reflection of the repro-i l ductive activity by the parent fish. In temperate areas, most spawning i

takes place in spring and summer; therefore, ichthyoplankton are col-lected most abundantly in these seasons. The presence of early life

! history stages of fish in an area of ten indicates that the area of the I water body is being used as a nursery by adult fish.

Because of their limited mobility, eggs and larvae are particularly susceptible to being affected by the operation of power generating i

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t stations. These effects, which are dependent on specific engineering variables, may include impingement upon water intake structures, en-trainment through condenser cooling systems, and entrainment in the heated effluent discharged during power generation (Battelle, 1974).

Thermal stress can kill organisms (Marcy, 1971; 1973), weaken them and f thus make them more vulnerable to predation (Schubel et al. ,1978), or, in the case of eggs, cause abnormal development of the embryo which of ten results in death soon af ter hatching (Koo and Johnston, 1978).

Mechanical stress can also weaken or kill exposed organisms (Marcy, 1973).

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3.0 METHODS Larval fish were collected by personnel from SCE&C from January through May 1985 at eleven stations in Monticello Reservoir (Figure 1).

Duplicate ichthyoplankton samples were collected at two depths (surface and mid-depth) at stations situated in open water (I through 0) and at the surface only at stations located in coves (Q, R, S, T). Collec-tions at Stations I and M were obtained approximately one-half hour after sunset, whenever possible. Station L was sampled during the generation phase of the FPSF. All samples were collected by towing flow-metered plankton nets, having 0.75 meter diameter mouth openings, and a mesh size of 363 micrometers. Sampling was conducted until approximately 100 cubic meters of water had passed through th e net.

Sampling f requency was monthly during January, and weekly during mid-February through May. The total number of samples collected was 574.

The collected organisms were preserved and returned to the laboratory for identification, measurement, and enumeration.

During each field sampling period physical measurements (including dissolved oxygen, conductivity, temperature, and pH) were taken, in situ, by using calibrated electronic meters. Water transparency was measured with a secchi disc.

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4.0 RESULTS AND DISUSSION l

4.1 Ichthyoplankton I

Mean monthly ichthyoplankton densities are presented in Table 1, and Table 2 presents the mean density of larval fish for the collecting period. Larval fish were collected during all months.

Larval white bass were the first ichthyoplankton appearing in Monti-cello Reservoir during the 1985 study. They occurred in January at two of the eleven stations with a density of 6.5 organisms /100 m3 3e Station N and a density of 0.5 organisms /100 m3 at Station T (Table 1). This is the earliest tha t ichthyoplankton have been collected in Montiello Reservoir and, since these stations are thermally affected by the VCSNS, it is likely this earlier spawning activity is directly related to the discharge of heated water by the VCSNS. This theory is substantiated by similar findings during the previous year (Dames &

Moore, 1985). This induced early spawning can be considered to have neither negative nor positive impacts on the fisheries community, but rather merely as a change in the spawning schedule. During February, ichthyoplankton, which also consisted entirely of white bass, were col-lected at six stations, four of which were thermally affected by the VCSNS. Collections of larval fish during February at the non-thermally influenced areas (Stations L and M) may indicate transportation of specimens to the area from Parr Rese rvoir , by the FPSF, or from the vicinity of Station K by winds from the northeast. In March larval fish were collected at all of the eleven sampling stations. l l

From March through May both the densities and diversities of larval fish increased at all stations with no evidence of influence from the VCSNS.

As in previo% years of the study (preoperational and operational)

Dorosoma sp. were the most abundant larvae collected with monthly l

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densities reaching as high as 112/m2 and 54.4/m2, surface and i

middepth respectively, at Station I in May. In 1985, Dorosoma sp. were first collected in March and were found at all stations during that month except O. This distribution indicates that spawning clupeids showed no apparent preference for heated or nonheated water, and en-phasizes a lack of influence of the VCSNS on the spawning behavior of this common species. Pomoxis sp. and Lepomis spp., two species which are important from a recreational and ecological viewpoint, were first collected in April, with no evidence of their spawning schedule being influenced by heated effluent from the VCSNS (Table 1). Uncertainty in identifying Leposis larvae to the species level (Conner, 1979) warrants the conservative designation of these as Lepomis spp. (sunfish),

although the majority of specimens fit the " bluegill type."

Table 2 presents the mean density of larvel fish at the sampling sta-tions. The control station (Station I) had the highest density, 36.4 and 13.8 organisms /m 3 at the surface and mid-depth locations, re-spectively. Station T, which was located in a cove on the east side of Monticello Reservoir (Figure 1) had the second highest density (20.6 organisms /m 3 ) of the stations.

At both Stations I and T shad were the predominant species collected. Sampling results at the other stations were generally similar throughout the study period.

4.2 Water Temperature and Dissolved Oxygen The water temperature and dissolved oxygen data are presented in Table 3 by station for each month of the study. This information was col-lected during larval fish sampling. In addition, average discharge temperature data, supplied by SCE&G personnel, are provided in Table 4.

The water temperatures recorded at the stations during the field sampling program in January reached a high of 14.5'C at Station N, a thermally influenced station, as opposed to a maximum of 7'C at Station 1

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I, the control station. Morone chrysops has a spawning temperature optimum of 15*C (Eddy and Underhill, 1974), a temperature approached at Station N where highest reproduction of this species in January appears to be closely related to the elevated temperatures resulting from VCSNS operations. Power generation at the VCSNS was sporadic during the first half of January (Figure 2) and if the plant had been generating at full capacity, it is possible that Morone chrysops spawning would have occurred even earlier. During the February sampling program high water temperatures of 19*C at a thermally influenced station (Q) and 15'C at the control station were recorded, accounting for the broad distribution of reproductive stages in the reservoir.

There was no evidence of any oxygen depletion or depressed oxygen levels at any of the thermally influenced stations during the study.

4.3 Power Generatior. History The power generation history of the VCSNS from January through May 1985 (Figure 2) is quite similar to the same period in 1984 (Dames & Moore, 1985). During 1983, however, the plant did not operate at full capa-city during the early part of the year (Dames & Moore, 1984) and as a result, the ef fects of the waste heat discharge on the reservoir were lessened. Due to this lack of heated effluent there was no apparent early spawning activity during 1983.

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SUMMARY

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l Fish larvae were collected in Monticello Reservoir during the first

! five months of 1985. Occurrence of ichthyoplankton during January and February appears to be related to the presence of heated water dis-charged from the VCSNS. The 1985 findings were similar to 1984 results in terms of species composition and abundance. Other than an ap-j parently induced early spawning Morone chrysops there were no notice-l able effects of the heated effluent on the spawning activities of the other species collected. No other effects of the VCSNS on the

ichthyoplankton of Monticello Reservoir , positive or negative, were

noted during the 1985 study. A larval threadfin shad (Dorosoma petenense) was collected for the first time in the study area.

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6.0 REFERENCES

Battelle, 1974. Battelle Laboratories, Inc., Environmental impact monitoring of nuclear plants-source book. Atomic Industrial Fo rum , Inc . August 1974, 810 pp.

Carlander , K.D. 1969. Handbook of freshwater fishery biology, Volume

1. Iowa State University Press , Ames , Iowa. 752 pp.

, 1977. Handbook of freshwater fishery biology, Volume 2.

Iowa State University Press, Ames, Iowa. 431 pp.

Conner, J.V., 1979. Identification of larval sunfishes (Centrarchidae:

Elassomidae) from southern Louisiana, in R.D. Hoyt (ed.),

Proceedings of the third symposium on larval fish, February 20-21, 1979, Bowling Green, Kentucky. Western Kentucky University. 236 Pp.

Dames & Moore, 1978. Environmental monitoring report June 1978 -

December 1978. For the Federal Energy Regulatory Commission p roject license number 1894 and the South Carolina Department of Health and Environmental Control. Distributed - May 1979.

, 1979. Environmental monitoring report January 1979 - June 1979. For South Carolina Department of Health and Environmental Control. Distributed - November 1979.

, 1979a. Environmental monitoring report July 1979 -

December 1979. For the Federal Energy Regulatory Commission Project License Number 1894 and the South Carolina De partment of Health and Environmental Control. Distributed - May 1980.

, 1980. Environmental monitoring report January 1980 -

December 1980. For the Federal Energy Regulatory Commission Project License Number 1894 and the South Carolina Department of Health and Environmental Control. Distributed - June 1981.

, 1981. Environmental monitoring report January 1981 - ,

December 1981. For the Federal Energy Regulatory Commission f Project License Number 1894 and the South Carolina Department of Health and Environmental Control. Distributed - September 1982. l l

, 1982. Environmental monitoring report January 1982 - ,

December 1982. For the Federal Energy Regulatory Commission l Project License Number 1894. 196 pp. Distributed - January ,

l 1984.

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, 1983. Environmental Monitoring Report, January 1983 -

September 1983. For the South Carolina Department of Health and Environmental Control, and the Nuclear Regulatory Commission.

February 1984. Distributed - February 1984.

, 1984. Environmental Monitoring Report, October 1983 -

March 1984. For the South Carolina Department of Health and Environmental Control, and the Nuclear Regulatory Commission.

February 1984. Distributed - June 1984.

, 1985. Environmental Monitoring Report, January 1983 -

December 1984. For the South Carolina De partment of Health and Environmental Cont rol, and the Nuclear Regulatory Commission.

Distributed - April 1985.

Eddy, S. and J.C. Underhill, 1974. Northern Fishes. University of Minnesota Press. Minneapolis, Minnesota. 414 pp.

Jester, D.B. and B.L. Jensen, 1971. Life history and ecology of the gizzard shad, Dorosoma cepedianum (Le Sueur) with reference to Elephant Butte Lake. Agricultural Experiment Stations Research Report 218. New Mexico State University. 56 pp.

Knight , C.B. , 19 65. Basic concepts of ecology. MacMillan Co. Toronto.

4 68 pp.

Koo, T.S.Y. and M.L. Johnston,1978. Larval deformity in striped bass, Morone saxatilis (Walbaum), and blueback herring, Aloss aestivalis (Mitchill), due to heat shock treatment of developing eggs.

Envir. Poll. 16: 137-149.

La gler , K.F. , 1969. Freshwater fishery biology. Wm. C. Brown Co . ,

Dubuque. 421 pp.

Marcy , B.C. , Jr. , 1971. Survival of young fish in the discharge canal o f a nuclear power plant. J. Fish. Res. Bd. Canada 28: 1057-1060

, 1973. Vulnerability and survival of young Connecticut River fish entrained at a nu 'a r power plant. J. Fish. Re s .

Board Can. 30: 1195-1203.

Miller, M.C. , G.R. Hater, T.W. Federle , and J .P. Re ed , 1976. Effects of powe r plant operation on the biota of the thermal discharge channel . Esch, G.W. and R.W. MacFarlane, eds. Thermal

_In :

Ecology II. ERDA Symposium Series (CONF-750425), Augusta, GA.

pp. 251-258.

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f-Schubel, Jr. , C.C. Coutant and P.M.J. Woodhead, 1978. Thermal effects of entrainment, in J.F. Schuble and M.C. March, Jr. (eds.), Power Plant EntrainmenE a Biological Assessment. Academic Press , New York, New York.

Snyder, D.E., 1971. Studies of larval fishes in Muddy Run Pumped Storage Reservoir near Holtwood, Pennsylvania. M.S. Thesis.

Cornell University, Ithaca, New York. 209 pp.

Sokal, Robert R. and F.J. Rohlf, 1969. Biometry. State University of New York at Stony Brook. 776 pp.

South Carolina Department of Health and Environmental Cont rol, 1981. I Water classification standards system for the state of South Carolina. 15 p . ,

1 U.S. Environmental Protection Agency, 1973. Biological field and laboratory methods for measuring the quality of surface waters and effluents. Document EPA-670/4-73-001. USEPA, Cincinnati, Ohio l l

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, 1976. Quality criteria for water. Document EPA-440/9-7 6-023. USEPA, Washington, DC 501 p.

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i TABLE 1 - MONTHLY DENSITIES OF LARVAL FISH (NUMBER /100 m3) COLLECTED IN NET TOWS, JANUARY TmOLOt KW 1985 Page I of 3 Scientitle or Family ksne Common ksne Station i J K L M N O Q R S T Ja nuary 1985 Morone chrysops white bass Sur f ace -- -- -- - --

6.52 -- - -- --

0. 54 Mid-depth -- -- -- -- -- -- -- -

Total Sur f ace -- -- -- -- --

6.52 -- -- -- --

0. 54 Mid-depth -- -- -- -- -- --

Fe bru ary 1984 Morone chrysops White bass Surf ace -- --

2.04 0.54 0.53 2.46 0.95 10.12 Mid-depth -- --

16.46 -- -- -- -- -- -- -- --

Damaged. un id. Sur f ace -- --

0.51 -- -- - -- -- -- -- --

Mid-d epth -- --

1.10 -- -- -- -- -- -- -- --

.- Total Sur f ace -- --

2.55 0.54 0.55 2.46 --

0.93 --

10.12 --

LJ Mid-d epth -- --

17.56 -- -- -- -- -- -- -- --

I March 1985 Dorosons spp. Shad Sur f ace 0.40 0.46 0.16 0.25 0.96 0.51 --

0.38 0.97 2.51 0.51 Mid-depth 0.42 --

0.57 0.32 0.96 -- -- -- -- -- --

Morone chrysops white bass Sur f ace -- -- --

1.48 4.04 0.09 0.99 1.96 0.11 3.69 0.45 Mi d-d epth --

0.58 0.51 --

0.62 1.41 -- -- -- -- --

Percidae Perch Sur f ace 4.33 1.83 0.36 1.03 0.25 0.21 --

0.l3 2.16 1.15 1.37 Mid-depth 0.96 1.38 -- --

0.32 -- -- -- -- -- --

Damaged. Unid. Sur f ace -- -- --

0.26 -- -

0.24 --

0.30 0.25 --

Mi d-depth -- -- -- -- -- -- -- -- -- -- --

Total Sur f ace 4.75 2.29 0.49 3.02 5.25 0.81 1.25 2.47 3.54 7.60 2.33 Mi d-depth 1.58 1.96 1.08 0.32 1.90 1.41 -- -- -- -- --

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Scienti fic or Family Name Common Name Station la J K L M* N' O' Q* R S* T*

April 1985 Dorosoma Shad Surf ace 56.05 11.55 1.62 4.41 3.58 1.l8 0.85 2.93 7.46 8.35 14.43 Mid-depth 5.86 3.95 5.46 4.95 0.29 7.29 2.33 -- -- -- --

Cy pr in idae Minnows Surface 0.11 -- -- -- -- -- -- 0.11 0.10 -- --

Mid-d epth -- -- -- -- -- -- -- -- --

Catostomidae Suckers Surface -- -- -- -- -- -- -- -- - -

0.10 Mid-depth -- -- --

Morone chrysops white bass Surf ace 0.13 -- --

0.24 0.23 -- -- -- - -- --

Mi d-d epth 0.14 0.32 --

0.33 --

0.86 -- -- -- -- --

L e pomi s sp. Sun t ish Surf ace 0.10 -- -- -- -- -- -- -- -- -

0.10 Mid-depth -- --

Pomonis spp. Crapple Surf ace 0.74 0.28 -- -- -- -- -- -- 0.11 -- 0.32 Mid-depth 0.76 -- -- -- -- -- -- --

Percidae Perch Surf ace 4.52 0.28 0.11 0.96 0.47 --

0.72 --

1.53 -- 2.80 2[ 0.29 -- --

Mi d-depth 3.78 -- -- -- -- -- -- --

Damaged, tmld. Sur f ace 0.13 0.30 0.24 0.24 -- -- -- 0.11 0.21 --

0.10 Mi d-depth -- --

0.12 -- --

0.72 -- -- -- -- --

Total Surf ace 61.76 12.41 1.96 5.85 4.28 1.18 1.57 3.14 9.41 8.35 17.47 Mi d-depth 10.53 4.25 5.58 5.28 0.59 8.40 2.33 -- -- -- --

• A total of 18 samples from these stations were lost during shipping.

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Page 3 of 3 h Scientific or Station J K L M N O Q R S T X Family Name Common Name 8 May 1985 Shad Surface 112.04 20.33 6.80 14.25 27.12 12.48 32.02 14.43 34.38 25.69 79.66 --

Dorosema sg . 14.61 17.62 13.08 10.53 10.37 - - - - --

Mid-depth 54.43 16.22 Dorosana potenense Threadfin shed Erface I.38 - - - - -

Mid-depth 0.16 - - - -

Cyprinidae Minnows surface -- - -- 0.34 -- - - -

Mid-depth Catostomidae Suckers Surface - -- - --

Mid-depth - - - - I.00 - - - - -

Suriace 0.27 0.50 0.29 0.26 0.25 - -- --

0.13 - 0.67 --

Lepools sg . Sunf Ish - - - - - - - - - - --

Mid-depth -

Surface 0.27 -- - - - - -- -- -- 0.13 --

Pomouls g . Crapple -

Mid-depth --

t 0.25 0.67 0.51 -

Perch Surface 0.25 1.02 0.12 3.03 0.76 0.29 1.06 -

Percidae 0.32 0.16 - - - - -- -

• Mid-depth 0.16 0.82 - -

I Surface 1.10 1.27 0.12 0.67 0.76 0.27 2.38 0.42 1.35 1.36 1.46 -

Demaged, l.hid. 0.77 0.34 - - - - --

Mid-depth 2.51 0.32 0.77 1.79 -

Surface 115.30 23.12 7.32 18.52 28.89 13.04 35.46 15.11 36.46 27.04 82.42 --

Total 14.08 18.46 10.75 - - - - --

Mid-depth 57.25 16.87 15.38 19.73 a -

{

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l l l 1 W!W W *==d w had w w w 1 ament m m w m w w w . m g.

1  ;

TABLE 2 - MEAN DENSITY OF LARVAL FISH (MLSdBER/100 e ) FOR STATIONS 8 TtHOUEM O DLRING JA8&MRY 1985 TtGOUEl MAY 1985 i

$ (.'4 b

Taxon Scient i f ic Name Station i J K L M N O Q R S T j thidentitled shsd Dorosoon g . Surface 33.69 6.47 1.72 3.78 6.33 2.83 6.57 3.55 8.55 7.31 18.92 Mid-depth 12.14 4.03 4.13 4.58 2.87 3.56 2.54 - - - --

Threadfin shad Dorosome potenense Surface 0.28 - - - -- - -- - - - -

Mid-depth 0.03 - - - - - - - - - --

Minnow Cyprinidae Surface 0.02 - -

0.07 - - --

0.02 0.02 - --

Mid-depth - - -

Sucker Catostooldae %rface - - -- - - - - - - -

0.02 Mid-depth - - - -

0.20 - - - - - -

White bass Morone chrysops krface 0.03 -

0.41 0.45 0.M 1.98 0.20 0.58 0.02 2.76 0.20 Mid-depth 0.03 C.18 3.39 0.07 0.12 0.45 - - - - -

Sunfish Lepools sg . Surface 0.07 0.10 0.06 0.05 0.05 - - -

0.03 -

0.13 Mid-depth - -

Crapple Pm ouls sg . Surface 0.20 0.06 - - - - - - - - -

8 Mid-depth 0.15 - - - -

0.03 -

0.02 - -

0.09 5 Perctd Percidae Surface Mid-dep+h 1.82 0.98 0.63 0.34 0.12 1.01 0.06 0.30 0.12 0.10 0.03 0.36 0.08 0.87 0.23 0.94 I

h =gd Unid. Sur f ace 0.25 0.31 0.17 0.24 0.15 0.05 0.53 0.11 0.37 0.32 0.31 Mid-depth 0.50 0.07 0.40 0.36 -

0.18 0.07 -- - - --

Totals Surface 36.36 7.56 2.47 5.59 7.79 4.% 7.65 4.33 9.88 10.62 20.61 Mid-depth 13.83 4.62 7.92 5.07 3.31 4.25 2.61 0.02 - -

0.09 w

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TABLE 3 - WATER TDePERATLRE Ale DISSOLVED OKYGEN, IN SITU IEASLREMENTS. JANUARY TmOUEN MAY. 1985 P888 ) 9f) J '

January

• February

• tenrcsi [ ks Temperature Dissolved Oxygen Temperature Dissolved Oxygen Temperature Olsnolve4 (kryten 'th (Degrees C) (eg/Ilter) (Decrees C) (en/llter) d' (Degrees C) (eg/Ilter)

Min eter Mean Min tenx tenen Min tems Mean Mla tenu benen Station Min Max Mean min Max tenen .

7.0 6.8 9.4 9.4 9.4 8.5 15.0 18.8 8.4 10.4 9.4 11.5 16.5 14.0 8.4 10.5 9.3 ]

I 6.5 10.0 10.0 7.8 7.9 7.9 8.5 14.0 11.3 8.6 9.2 8.9 13.5 17.0 15.1 8.3 10.0 9.0 r J 10.0 10.0 8.5 8.9 8.7 13.0 15.0 14.0 9.5 9.5 9.5 12.0 18.0 15.1 8.4 10.0 9.1 K 10.0 10.0 L 7.5 8.0 7.8 9.5 9.5 9.5 8.0 16.0 12.0 7.4 10.1 8.8 11.5 16.0 13.8 8.5 8.8 8.6 7.5 7.3 9.0 9.6 9.3 9.0 14.5 11.5 8.6 10.0 9.3 13.5 15.0 14.3 8.3 9.7 9.1 M 7.0 11.5 8.3 9.9 9.1 10.0 16.5 13.3 7.9 9.4 8.7 12.0 20.0 14.9 8.2 9.8 9.2 N 8.5 14.5 0 8.5 9.0 8.8 7.8 8.8 8.3 10.0 14.5 l2.3 9.9 10.4 10.2 13.5 18.0 15.3 7.8 9.5 8.6 11.0 11.0 9.0 9.0 9.0 19.0 19.0 19.0 10.3 10.3 10.3 20.0 22.0 21.5 9.5 10.4 9.7 Q 11.0 R ll.5 11.5 11.5 8.8 8.8 8.8 17.5 17.5 17.5 10.4 10.4 10.4 15.0 20.0 18.1 8.6 9.9 9.2 11.5 13.5 11.5 9.8 9.8 9.8 16.5 16.5 16.5 9.4 9.4 9.4 15.0 20.0 18.0 8.6 9.9 9.3 S ik C T I0.0 10.0 10.0 9.0 9.0 9.0 16.0 16.0 16.0 9.3 9.3 9.3 14.0 19.5 17.5 8.4 9.8 9.2 {,,

I -40

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TABLE 3 (Continuedl hoe 2 of 3 C,

f May *. , t, -

AprII Dissolved Oxygen Temperature Dissolved Oxygen '> t Temperature '

(Degrees Cl (es/alterl (Degrees Cl (ag/Ilterl min Max Mean  !

Statlee Min Max Mean Man h Mean Min Max Mnen I 16.0 24.0 18.9 6.8 15.0 8.4 19.0 29.0 23.4 5.3 9.7 7.6 J 16.5 25.5 20.0 7.0 11.0 9.0 19.5 26.0 22.0 5.8 10.2 7.8 K 18.0 26.0 28.4 7.5 9.5 8.6 20.0 26.0 23.5 8.0 10.8 9.1 L 15.5 23.5 18.9 6.8 9.5 8.2 19.0 25.0 21.4 5.8 10.2 7.9 M 16.0 23.0 18.5 6.4 9.5 8.4 20.0 23.5 21.8 6.0 f.7 8.1 h 16.5 25.0 20.1 6.0 10.1 8.4 20.0 29.0 23.5 6.4 11.4 8.5 ,,'r g 7.2 8.5 19.5 24.5 21.8 6.3 9.6 7.7 ,$ '

0 16.0 25.0 19.6 10.1 Q 22.0 27.0 25.2 8.2 9.8 9.0 28.0 30.0 27.1 8.4 10.1 9.2 R 20.0 27.0 23.4 8.3 9.5 9.0 20.5 26.0 24.4 9.0 11.1 9.9 8 S 19.0 27.0 22.9 8.2 9.8 8.9 21.0 27.0 25.0 8.5 10.7 9.7 08 T 19.5 27.5 22.7 8.2 9.1 8.8 20.0 26.0 23.6 7.2 9.8 8.8 I

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TABLE 4 - AVERAGE CIRCULATING WATER DISCHARGE TEMPERATURE (*F) AT THE J VIRGIL C. SUMMER NUCLEAR STATION, JANUARY THROUGH MAY 1985 Day January February March April May v

1 74.6 71.4 58.8 84.9 ND E 2 75.4 72.5 74.1 86.0 ND

-A 3 78.8 73.4 73.4 85.6 ND 4 77.2 73.5 76.7 82.5 ND g 5 74.9 73.5 76.3 62.6 ND

_,3 6 74.7 72.8 77.1 80.4 ND 7 71.9 72.6 78.3 85.7 ND 8 53.7 72.3 77.3 86.9 71.0 9 58.4 72.2 77.9 87.3 70.4

~-

10 69.6 71.5 80.2 86.8 69.8 11 '/ 7.4 70.6 79.2 86.0 70.0 E 12 77.3 70.5 78.5 84.4 75.8 r-A 13 51.9 70.5 80.6 85.8 88.9 14 51.0 70.6 81.2 88.6 95.8 E 15 59.4 70.9 83.4 87.8 95.7

,. j 16 61.9 60.2 83.2 88.9 96.9 17 65.6 45.4 65.2 89.5 98.0 18 66.9 52.4 75.4 70.1 98.3 j 19 73.6 68.0 81.4 77.7 97.3

' 20 72.9 72.7 80.4 89.2 96.7 21 72.9 72.1 80.0 89.8 97.5 22 72.4 72.5 81.1 91.7 97.3

-1 23 72.1 71.5 72.6 73.0 81.2 81.0 91.4 90.1 96.5 98.2 24

'y 25 71.8 74.6 82.1 92.6 99.8 26 71.9 77.0 82.1 92.9 98.5 I '3 27 71.2 60.1 80.8 93.0 97.8 i 28 70.3 54.5 81.3 92.8 97.4 t

l 29 30 71.7 71.1 81.7 83.2 72.8 ND 98.5 99.5 31 71.9 82.8 98.4 No - o oma

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