ML20030D246
| ML20030D246 | |
| Person / Time | |
|---|---|
| Site: | Catawba  |
| Issue date: | 07/31/1981 |
| From: | DUKE POWER CO. |
| To: | |
| Shared Package | |
| ML20030D245 | List: |
| References | |
| NUDOCS 8109010061 | |
| Download: ML20030D246 (27) | |
Text
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DUKE POWER COMPANY CATAWBA NUCLEAR STATION INTERIM MONITORING STUDY June 1980 - July 1981 8109010061 A10825 i
PDR ADOCK 06000413 R
pyg
INTRODUCTION Lake Wylie, located in North and South Carolina, is the third largest of eleven reservoit s impounding the Catawba River by Duke Power Company.
This reservoir extends north 28 miles from the Wylie Dam up to the Mountain Island Dam. At full pond elevation (569.4 feet above MSL) Lake Wylie has a surface area of approximately 5000 ha, and contains a total 8 3 volume'of approximately 3.46 x 10 m with a mean depth of approximately 7 meters (Industrial Bio-Test Laboratories 1974; USEPA 1975).
Lake Wylie has a drainage basin of 3020 square miles (Duke Power Company Data Manual 1980) with 630 square miles drained by the South Fork Catawba River (Industrial Bio-Test Laboratories 1974). The lake receives 50% of its water from the Catawba River via Mountain Island reservoir, 25% from the South Fork River and 2b% from local tributary input and runoff (Industrial Bio-Test Laboratories 1974). Based on an average flow of 125 cms through Wylie Dam, the average theoretical retention time af the reservoir is 32 days (Industrial Bio-Test Laboratories 1974).
The reservoir serves the Wylie Hydroelectric Station (60 megawatts) whi;h has an average generating discharge of 116 cms.
During operation, water is withdrawn from a depth of 6 to 18 meters and discharged downstream.
The lake also serves as a cooling water source for Plant Allen Steam 1
Station, a 1155 megawatt fossil fired steam gerierating station.
Plant Allen, located on the northern portion of Lake Wylie between the Catawba River and the South Fork River, draws cooling water from the Catawba River at a maximum rate of 38 cms. This water is used for once through condenser cooling and discharged into the South Fork River.
t 1,
I In addition, Lake Wylie will supply makeup water at an average flow of 10 cms for the Catawba Nuclear Station (CNS).
Catawba Nuclear Station is located in York County, South Carolina, with the site being near the center of a peninsula lying between Beaver Dam Creek on the north, Big Allison Creek on the south, and the main body of Lake Wylie on the east (Figure 1).
The cooling water will be withdrawn from the main body of the lake and will pass through a maximum of ten cycles of concentration in mechanical draft cooling towers with the blowdown to be discharged at a rate of 0.15 cms into the Allison Creek arm of Lake Wylie.
In August 1974, Duke Power Company, Environmental Services Section began a sam;) ling program on Lake Wylie. This program constitutes the interim monitoring program for Catawba Nuclear Station.
The interim study conforms to the 1977-1979 interim program stated in the Catawba Nuclear Station Environmental Report (CNSER Section 6.1.1.1.2 - Table 6.1.1-4).
Data for the period 1974 through 1980 have been reported by Duke Pcuer Company (1977a, 1978,1979,1980a). The data contained in this report cover the period July 1980 through June 1981. The objectives of the interim study for Catawba Nuclear Station are to:
(1)..ocument any long-term trends in the temporal variability of Lake Wylie water quality and, (2) compare long-term trends in the water quality data immediately above and below the CNS site.
MATERIALS AND METHODS Sampling locations were monitored from July 1980 through June 1981 (Figure 1; Table 1).
The samplir.g regime is listed in Table 2.
A Hydrolab Model 60 l
l
j t
water quality surveyor was used for all in-situ measurements. Water samples were collected with a diaphragm pump. The analytical methods for chemical
~
and physical constituents measured on Lake Wylie are listed in Table 3.
Quality assurance practices adhered to USEPA (1972).
~
Data Analysis Daily precipitation totals at Douglas Municipal Airport, Charlotte, North l
Caroli'na were plotted for July 1980 through June 1981 (National Oceanic and Atmospheric Administration 1979-1980). Also, daily Lake Wylie forebay surface elevations were plotted to indicate lake levels for the period. Mean daily discharge at Wylie Hydroelectric Station and at Mountain Island Hydroelectric Station were also plotted to indicate daily discharges (Figure 2).
The water quality data were subjected to desc-iptive statistics (means, standard deviation, maximum and minimum values) as outlined in Barr et al.
(1976).
Also, the data were subjected to Pearson's correlation analysis l
(Helwig and Council 1970). Only results with p s 0.05 were considered statistically significant.
Standard deviation is denoted by "s".
For statistical calculatior,s, all analytical determinations recorded as less than the detection limit were assumed to be equal to the detection limit as listed in Table 3.
Bicarbonate values were calculated from alkalinity values using factors found in Hem (1970). Water samples were not analyzed for iron during May 1981.
To sunmarize the large amount of data collected from July 1980 thrcugh i
June 1981 the following locations were grouped into specific regions as previously reported: Catawba River region (Locations 250.0 and 260.0),
South Fork Catawba River region (Locations 240.0 and 249.0), Catawba Nuclear l
l
Intake region (Locations 220.0 and 225.0) and Catawba Nuclear Station Discharge region (Locations 210.0 and 215.0).
These groupings were based primarily on the geographic area of each location on Lake Wylie.
Data obtained from Locations 220.0, 235.0, 242.0 and 272.0 were used to discuss annual lakewide variability.
In discussing seasonal variability among quarterly data the following monthly divisions were made:
summer (July), fall (November), winter (January) and spring (May).
The physicochemical data collected on Lake Wylie during the 1980 through 1981 interim period are available in Duke Power Company offices.
SUMMARY
AND CONCLUSIONS In-situ profile data were collected monthly and water samples for laboratory analyses were collected quarterly during the period July 1980 through June 1981. As noted in previous reports, local hydrology and meteorology exerted the primary influence upon chemical and physical parameters variabili ty.
The South Fork Catawba River continued to be strongly influenced by surface runoff, municipal and industrial discharges, and thermal discharges frem Plant Allen Steam Station.
Receiving primary discharge from Mountain Island Lake, the Catawba River continued to exhibit trends of a well-mixed riverine system. The region of Lake Wylie immediately above and below Catawba Nuclear Station displayed characteristics of a warm monomictic lake (Hutchinson1957).
Water temperatures throughout Lake Wylie generally followed seasonal vari-ations. As observed in previous study periods, temperature profiles in the South Fork sector displayed stratification arising from heated discharge
water from Plant Allen. Temperatures in the Catawba River region indicated well mixed conditions. The maximum water temperature was measured in the South Fork Catawba River region which is influenced by thermal discharge from l
Plant Allen. The minimum temperature was measured during January at Location 249.0. Thermal stratification was apparent during the spring and summer.
Isothermal conditions were observed in the regions immediately above and below
{
CNS from November through March.
Dissolved oxygen (D0) concentrations generally reflected the relationship between oxygen solubility and water temperature.
Lowest D0 concentrations generally occurred from July through October resulting in anoxic or near anoxic conditions in the bottom waters. The maximum D0 concentration was observed during January and February in the Catawba Nuclear Station discharge region.
j Due to below normal precipitation levels during the period ending June 1981, turbidity values were generally less than 15 NTU.
Lake Wylie is a soft water lake, exhibiting a hardness value of 15 mg-CACO 3
l Nutrient and mineral concentrations in Lake Wylie continued exhibiting trends similar to those observed during previous studies. As reported previously, the nutrient concentrations in the South Fork Catawba River were generally higher than any of the other regions of the lake. Total phosphorus concen-trations were greatest in the South Fork Catawba River region. Total phos-phorus concentrations were generally lower in the rest of the lake with no I
l consistent uplake or downlake trends.
i Analyses of cadmium, copper, and lead indicated concentrations and spatial i
variability similar to previous years (Duke Power Company 1977, 1978, 1979,
1980). Heavy metal concentrations were higher in the South Fork Catawba River region as previously reported.
Lake Wylie resembles other Piedmont reservoirs. The chemical and physical constituents measured on Lake Wylie continued exhibiting trends similar to those observed during previous studies. No significant changes were observed from the previous year interim period.
RESULTS AND DISCUSSION Physical Variables (Temperature, Dissolved Oxygen, Turbidity)
Lake Wylie temperatures ranged from 2.3 C during January (Location 249.0) to 38.2 C during July (Location 242.0). Maximum temperatures were observed during i
the warmest months July (38.2 C) and August (36.4 C). The highest temperature each month was measured in the South Fork' Catawba River region due to thermal discharges from Plant Allen Steam Station (Figure 3). Minimum temperatures were recorded lakewide during January (2.3"C, Location 249.0) and February (4.9 C, Location 215.0). With the exception of the low January temperature at Location 249.0, the water temperature was always above 4 C.
Thermal stratification was apparent from May through August.
The South Fork Catawba River region was stratified each month as in past studies (Industrial Bio-Test Laboratories 1974 Duke Power Company 1977a, 1978,1979,1980a). As a result of thermal discharge from Plant Allen, a surface plume of heated water frequently extended upstream and downstream (approximately 1.5 miles) from the point of discharge (Industrial Bio-Test 1974). As indicated by the consistently small difference between maximum and minimum water temperatures, the Catawba River region is a thermally well-mixed riverine system. Surface to bottom temperature values at CNS intake and i
1
discharge exhibited little vertical difference from July 1980 through l
June 1981 (Figure 5-6).
The maximum difference in vertical temperature values (5 C) was observed at CNS intake and discharge during July 1980 and Ju~ne 1981 (Figure 5-6).
Previous studies reported temperature trends similar to those observed during this period (Duke Power Company 1977a,1978, 1979, 1980a).
Following seasonal patterns typical of other Piedmont Carolina reservoirs (Duke Power Company 1977b; Industrial Bio-Test Laboratories 1974), dissolved oxygen (D0) concentrations in Lake Wylie ranged from 0.0 mg l'I (July) to 13.5 mg.l'I (January).
liighest concentrations occurred in January and February and the lowest D0 concentrations generally occurred from July through October (Figures 3, 4, 6).
Dissolved oxygen concentrations in the water i
column began to decline in April with the bottom waters being less than 5.0 j
mg l'I from July through September 1980 and June 1981 (Figures 3, 4, 6).
Surface 00 concentrations were always above 5.0 mg.l'I These D0 trends were similar to those observed in previous reports (Duke Power Ccmpany 1977a.
1978, 1979, 1980a).
The mean D0 concentrations in both the Catawba River and the South Fork Catawba fiiver regions were consistently higher during the warmest months than the regions immedineij above and below Catawba Nuclear Station (Figures 3, 4).
This was due to the more extensive oxygen depletion of l
the bottom waters in the deeper downlake regions during the stratified
[
period. Mean monthly D0 concentrations were nearly identical among the locations in the downlake regions throughout the study.
Depletion of hypolimneticoxygenoccurredduringthesummermonths(Figure 6),as previously observed (Duke Power Company 1977a, 1978, 1979, 1980a).
. ~.
_. _ _ _ _.__,-...., _... ~.._..- _ _,.._ _. - _ _. _ - _ ___
Turbidity, ranged from 3 to 105 NTU (i = 11.9, s = 16).
Turbidity values fluctuated about 15 NTU.
Highest turbidity values were recorded in the Catawba River region and the South Fork Catawba River region during summer an'd fall (105 NTU, Location 240.0; July) (Figure 7) and were similar to spatial trends observed in previous reports (Duke Power Company 1977, 1978, 1979,1980). Turbidity values in the downlake locations immediately above and below the Catawba Nuclear Station were 5 NTU during the winter and spring, with values of 15 NTU or less during other seasons. A general decrease in turbidity was observed during the period throughout the lake due to a decrease in rainfall (Figure 7).
Alkalinity and pH Alkalinity values exemplified a soft water lake (Wetzel 1975). Monthly values ranged from 4 to 27 mg-CaC0 1 (i = 15, s = 4).
Lake Wylie was 3
slightly acidic with 86% of the pH values less than 7.0 pH units.
During this interim perod, pH values ranged from 5 (Location 272; November) to 9 (Locations 210.0, 215.0, and 200.0; June) (i = 7.0, s = 0.5).
The higher summer pH values observed in the surface waters were attributed to photo-synthetic activity. The seasonal pH treads were imilar to those previously reported. Alkalinity and pH values exhibited little spatial differences.
Specific Conductance and Hardness Specific conductance values ranged from 42 to 296 pmho.cm-I (i = 102
-I pmho.cm, s = 34). As observed in past years, specific conductance values were higher in the South Fork Catawba River region than in either the Catawba River region or the downlake regions in the vicinity of CNS.
Previous studies of Lake Wylie reported slightly lower conductivity values
1
-I (range of 30 to 198 pmho cm during the period 1979-1980).
No appreciable variation was observed between the conductivities of the lake regions
{
immediately above and below CNS. Lake Wylie waters, exhibiting a hardness va'lue of 15 mg-CaC0 1
, exemplified a soft water lake (Wetzel 1975).
3 f
1 Mineral Composition No substantial monthly or yearly variability was observed in mineral con-centra'tions (Figure 8).
Sodium and bicarbonate were the ma.br ions in Lake Wylie. Calcium, chieride, magnesium, silica, and potassium were also i
abundant constituents in Lake Wylie (Figure 8). Minor mineral constit-i uents included aluminum, iron, arr. manganese (Figure 8).
1 Aquatic Nutrients (Nitrogen and Phosphorus)
The mean nitrate plus nitrite concentration was 0.21 mg-N 1-I (s = 0.14),
with concentrations ranging from less than 0.006 mg-N l-I (July 1980) to 0.88 mg-N l-I (January 1981).
The trends observed during the 1979-1980 study continued through the 1980 - 1981 period (Figure 9). Maximum con-centrations of nitrate plus nitrite generally occurred in winter and spring.
i The lower nitrcte plus nitrite concentrations occurred during July and were indicative of low D0 concerdration and low oxidation-reduction potential
(-60 mv; July 1980) (Wetzel 1975) in Lake Wylie bottom waters.
Upstream loading along the South Fork River (Industrial Bio-Test Laboratories 1974) resulted in higher nitrate plus nitrite concentrations in the South Fork Catawba River region than any of the other three regions of the lake (Figure 9)-
The lake regions immediately above and below CNS continued to display previous observed seasonal patterns with slightly lower concentrations at the CNS discharge region. Nitrate plus nitrite concentrations were similar to those reported in previous studies (Figurp 9).
= _ -.
l i
l The mean amonia concentration for the study was 0.22 mg-N.1-I (s = 1.2),
with concentratioas ranging from less than 0.005 mg-N.1-I (January 1981) to 12 mg-N 1-I (November 1980).
Indicative of an upstream point source loading, the highest amonia value (12 mg-N.1-l) was observed in November at i
the Catawba River region (Location 260.0) (Figure 10).
Higher ammonia
)
concentrations were observed in the uplake regions during November and January than observed in past years (Figure 10).
4 The temporal trends of total phosphorus and orthophosphate were similar.
Orthophosphate concentrations ranged from less than 0.005 mg-P 1-I (26%)
to 0.22 mg-P 1-I (i = 0.022 mg-P l'I, s = 0.03). Orthophosphate concentra-i 1
tions were higher in the deeper water regions immediately above and below l
CNS during the fall and may hve been due to the release of orthophosphate frou the sediment during anoxic conditions (Golterman 1975). Orthophosphate concentrations in the South Fork Catawba River region were considerably higher than the concentrations in the Catawba River region. Orthophosphate concentrations in the lower lake regions were intermediate between the i
South Fork Catawba River and the Catawba River region.
Previous studies reported orthophosphate trends similar to those observed during this period (Duke Power Company 1977a, 1978, 1979, 1980a).
During the study period, total phosphorus concentrations ranged from 0.01 to 0.50 mg-P 1-I (i = 0.050, s = 0.07). Total phosphorus concentrations i
decreased with distance downstream from the South Fork Catawba River region. As in previous years, highest levels of total phosphorus were observed in the South Fork Catawba River region throughout the year with the greatest concentration (0.50 mg-P 1
) measured during July (Figure 11).
a 1
)
m 4
LITERATURE CITED American Public Health Association (APHA), American Water Works Association (AWWA), and Water Pollution Control Federation (WPCF).
1976.
Standard methods for the examination of water and wastewater.
14th ed.
American Public Health Assn. NY.
1193 p.
Barr, A. J., J. H. Goodnight, J. P. Sall, and J. T. Helwig.
1976. A user's guide to SAS 79. Sparks Press.
Raleigh, NC. 494 p.
Currie, L. A.
1968.
Limits for qualitative detection and quantitative detection. Analytical Chemistry Vol. 40, March 1968.
Duke Power Company.
1977a. Catawba Nuclear Station Interim Monitoring Study. July 1974-1977. Duke Power Company.
Charlotte, NC.
1977b.
Chemical characteristics of piedmont lakes. Workshop in Aquatic Ecology in the Southeast. October 14, 1977.
Duke Power Company. Charlotte, NC.
np.(notpublished).
1978.
Catawba Nuclear Station Interim Monitoring Study.
July 1977-June 1978.
Duke Power Ccmpany, Charlotte, NC.
1979. Catawba Nuclear Station Interim Monitoring Study.
July 1978-June 1979.
Duke Power Company.
Charlotte, NC.
j i
1980a.
Catawba Nuclear Station Interim Monitoring Study. July j
1979 - June 1980. Duke Power Company.
Charlotte, NC.
l 1980b. A guidebook to aquatic chemistry studies, 1959-1977.
Charlotte, NC.
1980c.
Data manual.
1980.
Duke Power Company.
Charlotte, NC.
Gol terman, H. L.
1975. Vertical movement of phosphate in freshwater,
- p. 509-538.
In:
E. J. Griffith (ed.).
Environmental phosphorus handbook, John Wiley and Sons, NY.
718 p.
Helwig, J. T. and K. A. Council (ed.) 1979.
SAS user's guide 1979 edition.
SAS Institute Incorporated, Raleigh, NC 494 p.
Hem, J. D.
1970. Study and interpretation of the chemical characteristics of natural water. Geological Survey Water-Supply Paper 1473.
U.S.
Government Printing Office, Washington, DC.
363 p.
Hutchinson, G. E.
1957. A treatise on limnology. Vol. I.
John Wiley and Sons, New York, NY.
1015 p.
Hydrolab Corporation.
1973.
Instructions for operating the Hydrolab Surveyor Model 6D in-situ water quality analyzer.
Austin, TX.
146 p.
t
Industrial Bio-Test Laboratories.
1974. A baseline / predictive environ-mental investigation of Lake Wylie.
September 1973-August 1974.
Report to Duke Power Company:
Industrial Bio-Test Laboratories.
Northbrook, 11.
743 p.
National Oceanic and Atmospheric Administration.
1979-1980.
Local
~
climalogical data 1979, Charlotte, NC. National Climatic Center, Asheville, NC.
Technicon Industrial Systems.
1972. Operation manual for the Technicon Autoanalyzer II System. Technical Publication ?!o. TAl-0170-20.
Tarrytown, NY.
United States Environmental Protection Agency.
1979. Handbook for analytical quality control in water and wastewater laboratories. Technology Transfer, Cincinnati, OH.
Weiss, C. M., P. H. Campbell, T. P. Anderson, and S. L. Pfaender.
1975.
The lower Catawba lakes: Characterization of phyto-and zooplankton communities and their relationships to environmental factors.
Department of Environmental Sciences and Engineering, School of Public Health, University of North Carolina, Chapel Hill, NC.
ESE Publication No. 389.
396 p.
Wetzel, R. G.
1975. Limnology.
W. B. Saunders, Philadelphia, PA.
743 p.
Table 1.
Lake Wylie water quality monitoring locations and depths.
j Total Depth Sampling Location #
(m)
Description Catawba River at Rt. 29-74 bridge, mid-i channel l
250.0 5
Catawba River, 25 m from Allen Steam Station i
intake screen 249.0 3-4 South Fork Catawba River at Upper Armstrong Bridge, mid-channel i
240.0 11-12 South Fork Catawba River at Lower Armstrong l
Bridge, mid-channel l
225.0 14-15 Lake Wylie at Route 49 Bridge, mid-channel f
220.0 15 Lake Wylie near mouth of embayment near j
proposed intake to CNS, mid-channel i
210.0 16-17 Lake Wylie near mouth of Big Allison Creek j
and Catawba River, due east of Goat Island, mid-channel 215.0 9-10 Big Allison Creek, near bridge over proposed l
discharge for CNS, mid-channel i
4 l
+
4 1
1 l
1
,-,-r
...-.._.-_,,_.,.,,.-..,.-,.-.,..,,...--_mm.,.-...-,,-..~..,-,,-.-,,.-r,-..,
Table 2.
Lake Wylic Interin Monitoring Program Location 210.0 215.0' 220.0 225.0*
240.0' 249.0 250.0^
260.0" t
F In-Situ Analyses t
in-situ parameters are acquired monthly using the In-situ Water Quality Analyzer Temperature at all locatons at 1 m intervals from the surface (0.3 m) to 1 m above the bottom.
Digsolved oxygen-pH' Specific conductance' Laboratory Analys_es
^
Alkalinity Q/T,B/2 QfT,B/2 Q/T,B/2 Q/T,B/l Q/T,B/l Q/T/l Q/T,B/l Q/T/1
'urbidity-Q/T,B/2 Q/T,B/2 Q/T,B/2 Q/T,B/l Q/T,B/l Q/T/l Q/T,B/l Q/T/l l
Ammoniat Q/T,B/2 Q/T,B/2 Q/T,B/2 Q/T,B/l Q/T,B/l Q/T/l Q/T,B/l Q/T/l fli tra te-fli tri te Q/T,B/2 Q/T,B/2 Q/T,B/2 Q/T,B/i Q/T,B/l Q/T/l Q/T,B/l Q/T/l Orthophosphatet.
Q/T,B/2 Q/T,B/2 Q/T,B/2 Q/T,B/l Q/T,B/l Q/T/l Q/T,B/l Q/T/l Total phospl.orus' Q/T,B/2 Q/T,B/2 Q/T,B/2 Q/T,B/l Q/T,B/l Q/ T/l h/T,B/l Q/T/1 Chloride?
Q/T,B/2 Q/T,B/2 Q/T,B/2 Q/T,B/l Q/T,B/l Q/!/1 Q/T,B/l Q/T/l Silicat Q/T,B/2 Q/T,B/2 Q/T,B/2 Q/T,B/l Q/T,B/l Q/T/l Q/T,B/l Q/T/l I ro r. '
Q/T,B/l Q/T,B/l Q/T,B/l Q/T,B/l Q/T/l*
Q/T,B/l Q/T/l t
Manganese Q/T,B/l Q/T,B/l Q/T,B/l Q/T,B/l Q/T/l*
Q/T,B/l Q/T/l t
Magnesium Q/T,B/l Q/T,B/l Q/T,B/l Q/T,B/l Q/T/l*
Q/T,B/l Q/T/l Calciumt Q/T,B/l Q/T,B/l Q/T,B/l Q/T,B/l Q/T/l*
Q/T,B/l Q/T/l Sodium +
Q/T,B/l Q/T,B/l Q/T,B/1 Q/T,B/l Q/T/l*
Q/T,B/l Q/T/l Potassium' Q/T,B/l d/T,B/l Q/T,B/l Q/T,B/l Q/T/l*
Q/T,B/l Q/T/l Aluminum +
Q/T,B/l Q/T,B/l Q/T,B/l Q/T,B/1 Q/T/l*
Q/T,B/l Q/T/l Cad-iumt Q/T,B/l Q/T,B/l Q/T,B/l Q/T,B/l Q/T/l*
Q/T,B/l Q/T/l Copper Q/T,B/l Q/T,B/l Q/T,B/l Q/T,B/l Q/T/l*
Q/T,B/l Q/T/l t
l Leadt Q/T,B/l Q/T,B/1 Q/T,B/l Q/T,D/l Q/T/1*
Q/T,B/l Q/T/l Zinc' Q/T,B/l Q/T,B/l Q/T,B/l Q/T,B/l Q,r/1*
Q/T,B/l Q/T/1 Total organic carbon Q/T,B/2 Q/T,B/2 Q/T,B/2 Q/T,R/l Q/T,B/l Q/T/l Q/T,B/l Q/T/l Codes t - Required by commitment index 0-Ir. house commitment Frequency of Sampling / Depth Intervals / Number of Replicates Frequency of Sampling:
Depth Intervals:
Number of Replicates:
M - Monthly T - Surface (0.3 n) 1 (only a surface and a bottom sample)
Q - Quarterly (Jan-Feb, April-May, B - Bottom (1 m above bottom) 2 (two surface and two bottom samples)
Aug,Oct-flov)
Table 3.
Analytical methods for chemical and physical constituents measured on Lake Wylie.
i Variables Method Preservation Octection limit Limit of Determination 1
Alkalinity, total Electrometric titration to a 4*C 1 mg-CACO. I
- 3 pH of 5.11 Aluminum Atomic absorption /DAl 0.5% HNO 0.2 mg.1 0.6 mg.1~I 3
l 4*C 0.006 mg-N.1'I 0.009 mg-N 1 Anania Automated phenate Cadmium Atomic absorption /HGAl 0.5% HNO 0.11pg.d OJ7vg.d 3
Calcium Atemic absorption /DAl 0.5% H'iO 0.06 mg l'I 38 mg.I'I 3
Chloride Automated ferricyanidel 4*C 0.2 mg.1"I 0.3 mg 1*I Conductance, specific Temperature compensated nickel In-situ 1 umho/cm electrodel Copper Atomic absorption /HGAl 0.5% HNO 0.7 ug.1"I 1.0 99 1 3
Hardness (Ca, Mg)
Calculation 2 0.1 mg-CACO M Iron. total Atomic absorption /DAl 0.5%HNO 0.1 mg d 0.2 mg [ 3 3
Lead Atomic absorption /HGAl 0.5% HNO 2 pg l'I 3.2 ug.1'I 3
Magnesium Atomic absorption /DAl 0.5% HNO 0.007 mg.d 0.01 mg d 3
Manganese Atomic absorption /DAl 0.5% HNO 0.02 mg.1"I 0.06 mg l'I
)
3 Nitrate + Nitrite Automated cadmium reductiont 4'C 0.005 mg-N.1~I 0.00C mg-N.1*I l
Orthophosphate Automated assorbic acid 4'C 0.005 mg-P.1"I 0.008 mg-P.1'I reductioni h idation-reduction potertial Silver-silver chloride In-situ 10 mv*
electrodel Oxygen, dissolved Temperature compensated In-situ -
0.1 mg l'I*
polarographic cell!
I pH Temperature compensated glass In-situ 0.1
- electrodel Phosphorus, total Persulfate digestion followed by automated ascorbic acid 4*C 0.004 mg-P 1"I 0.006 mg-P l'I reductioni Potassium Atomic absorption /DAl 0.5% HNO 0.03 mg.1'I 0.006 mg-P.1"I 3
t 4*C 0.2 mg-Si.1'I 0.3 mg-Si.1"I Silica Autoaated molydosilicate Sodium Atomic absorption /DAl 0.5% HNO 0.03mg.d 0.06 mg d 3
Tempera ture Thermistor thermometer!
In-situ 0.1*C*
Turbidity Nephelometric turbidityl 4*C 1 NTU*
Zinc Atomic absorpt!on/DAl 0.5% HNO 4pg-d 7 pgd 3
t = Thy detection limit is defined as: OL = 1 + 2(s), where ! = mean and s = standard deviattan of a selected number of blanks. The limit of determination is defined as: LD = ! + Sfs.4
- = Detection limit and limit of determination ver)e not determu. d on these variables; instead instrument sensitivity is givea.
ND = Not detemined.
? ydrolab Corp. 1978
'curria 1968 I SEPA 1979 2 APHA 1976 H
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I
N,0?o'5A"M 9
';;20 N N D _ '-
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- r 0 0
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5
- 1. (
PLAN 1 g
- ALLEN 2420 N ORy
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- Rog,
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Figure 1.
Sampling locations for Catawba Nuclear Station Interim Monitoring.
Locations required by the comitment index are underlined.
10 8
'- Mountain Island Discharge 12 2 4
5 "t
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July Aug Sept Oct Nov Dec Jan Feb Mar Apr May June 1980 1981 Figure 2.
Summary of available hydrologic data for Lake Wylie for the period July 1989 - June 1981. The circle indicates monthly collection of water samples for analyses.
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Figure 4.
Month y variations of mean temperature and dissolved oxygen for the CNS Intake and the CNS Discharge regions of Lake Wylie, 1976-1981.
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Thermal regimes ( C) at CNS Intake (Location 220.0) and CNS Discharge slocation 215.0),
July 1980 through June 1981.
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Figure 6.
Dissolved 0xygen (mg/1) isopleths at the CNS Intake (Location 220.0) and the CNS Discharge j
(Location 215.0), July 1980 through June 1981.
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Seasonal variations of mean turbidity for Lake Wylie, 1975-1981.
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Mn UC0 C1 Na Ca Mg Fe Al K Mn HCO3 C1 3
WINTER
-SPRING Figure 8.
Variations (meq/1) in mineral compositions for Lake Wylie, July 1980 through June 1981.
Graphs inset indica e variations for the period July 1979 - June 1980.
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!c 1978 1973 17.0 1981 Figure 9.
Variations of nitrate + nitrite concentrations for Lake Wylie, Wylie, 1976-1981.
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Variations of ammonia concentrations for Lake Wylie, 1976-1981.
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1977 1978 1979 I T,0 1981 Figure 11.
Variations of total phosphorus concentrations for Lake Wylie, 1976-1981.
I
- - _ _ _ _ - _ _ _ _