ML19056A409

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Virgil C. Summer Nuclear Station NPDES Permit No. SC0030856 Renewal Application, 2018 Water Quality Monitoring Report for Monticello Reservoir
ML19056A409
Person / Time
Site: Summer South Carolina Electric & Gas Company icon.png
Issue date: 01/30/2019
From:
South Carolina Electric & Gas Co
To:
Office of Nuclear Reactor Regulation
Shared Package
ML19056A440 List:
References
RC-19-0012
Download: ML19056A409 (53)
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2018 Water Quality Monitoring Report For Monticello Reservoir January 30, 2019 SCE&G Water Quality Monitoring SCE&G is becoming I} Dominion Energy* 1 Introduction Monticello Reservoir 2018 Monticello Reservoir is the upper reservoir for a pumped storage hydroelectric plant (Fairfield Pumped Storage Facility) and the cooling reservoir for a nuclear powered electric generation facility (Virgil C. Summer Nuclear Station Unit 1). Monticello Reservoir is located in Fairfield County, near Jenkinsville, South Carolina.

The water quality sampling described herein is continuation of more than 20 years of monthly sampling performed in an effort to assess the condition of Monticello Reservoir.

Water quality profiles (measuring depth, temperature, pH, specific conductance,'

and dissolved oxygen) were conducted on a monthly basis at three locations within Monticello Reservoir in 2018. The locations are designated as follows (see Figure 1): "Uplake 16", locatednear the northern end of the reservoir (near the old NUS site 16), "l:i;itake 2", located in-the channel near the circulating water)n.take for the Virgil C. Summer Nuclear Station Unit 1, "Discharge 6", located just outside the northern end of the circulating water discharge canal for the Virgil C. Summer Nuclear Station Unit 1 (VCSNS). These three locations cover three major portions of Monticello Reservoir, which are: the area near the Fairfield Pumped Storage Facility (FPSF) intake, which is influenced by pump back and generation operations of the hydroelectric plant; the area near the discharge canal, which is influenced by the VCSNS thermal discharge; and the northern end of the reservoir which is relatively unaffected, in terms of water quality, by either the FPSF or the VSCNS. All measurements were conducted in the field using a YSI ProDSS meter and sonde. Conductivity, pH, and dissolved oxygen were calibrated in the laboratory prior to taking field measurements and temperature accuracy is confirmed annually (SC DHEC Certificate Number 32580001).

Data were collected between mid-morning and early afternoon on each sampling day. 2 Results General-Data collected are presented in the Tables 1-36 and Figures 2-7. Maximum depth of measurements varies between months due to boat positioning and the reservoir level at the time of sampling.

Each table displays depth, temperature, pH, conductivity, and dissolved oxygen. Measurements were taken from surface (approximately

0.3 meters

in depth), to the bottom in 1 meter increments.

Six graphs (Figures 2-7) are provided to show contrast or similarities of like parameters, different locations, and same dates. Specific Conductance was not included in the graphs due to low variability.

Results are discussed by parameter below. The months of January and July were graphed to show extremes in 2018 parameter values. Temperature-As the result of heated water discharge from VCSNS, surface water temperatures were higher at the Discharge 6 site than at the other two locations in Monticello Reservoir (see Figures 2 and 3). A thermocline is a zone of rapid temperature change indicating a boundary between water layers of different temperature and density. This temperature change can be as little as 1 degree Celsius per meter of depth increase.

In the fall, due to cooler weather conditions, thermal stratification breaks down allowing mixing *oflayers.

A thermocline is evident at Intake 2 in July *at around 22 meters (Figure 3). Discharge 6 has a thermocline at 1 to 2 meters due to the thermal plume discharged from VCSNS whenever Summer Station is operational.

Dissolved Oxygen-Dissolved oxygen in Monticello Reservoir is relatively high throughout the year except for the deeper waters in the late summer. These deep waters, due to their lower temperatures and relatively higher density, do not mix with the upper layers of water in the reservoir and become oxygen depleted during the summer. A general decrease in oxygen occurs with depth during the summer months as evidenced in two of the three sites sampled. During winter thorough mixing of water layers occurs, distributing dissolved oxygen from surface to bottom. Uplake 16 site shows the greatest decline in oxygen with depth in the summer months. There is more mixing occurring at Intake 2 due to the influence of pump-back by Fairfield Pumped Storage Facility operations, but the deepest portions of this area still exhibit oxygen depletion during the summer (see Figure 7). pH-The pH in Monticello Reservoir is generally neutral. Measured pH values in 2018 ranged from a low of6.4 to a high of9.7 s.u. During the winter months pH profiles are similar at all three sampling sites (see Figure 4). In the spring and summer, pH values are higher at the Uplake 16 site. This is due to phytoplankton photosynthetic activity in the surface waters to a depth that sunlight can penetrate.

The uptake of carbon dioxide and reduction of bicarbonate and carbonate ions during photosynthesis by aquatic plants (including microscopic phytoplankton) results iri increased pH. The highest pH value of 9.7 s.u. was measured during June 2018 near the surface at the Uplake 16 site. The water mixing process previously mentioned at Intake 2 and Discharge 6 sites keeps their pH values lower than at the Uplake 16 site. 3 Specific Conductance.,.

In 2018 specific conductance in Monticello Reservoir was 69 to 118 uS/cm. In general, low conductivity values are consistent for Monticello Reservoir and show only slight variation throughout the year. Summary Water quality measurements reveal that Monticello Reservoir exhibits mixed thermal conditions at the southern end of the reservoir with the exception of the thermal plume from Summer Station (Discharge 6 site). There is no evidence of the thermal plume from Summer Station in the area near the Summer Station circulating water intake (Intake 2), nor at the uplake sampling location (Uplake 16). Water quality measurements reveal a thermally stratified environment at the uplake sampling location during warm weather months. Dissolved oxygen levels remain relatively high in Monticello Reservoir throughout the year except in deep water during the summer months. Near neutral pH conditions are the rule for Monticello Reservoir, except for photosynthesis induced pH elevation near the surface during the spring and summer months. Conductivity values are generally low and are consistent with historical Monticello Reservoir values. Data collected during 2018 suggest that water quality in Monticello Reservoir is sufficient for support of aquatic life. 2018 water quality data are consistent with data collected since at least 1996 and show very little change in the conditions of Monticello Reservoir since that time. Caleb J. Gaston SCANA Environmental Services SCANA is becoming Dominion Energy 4 Figure 1. 5 Figure 2. 20.0 -u 0 --; 15.0 .... :::, -co .... (L) a. E 10.0 (L) I-5.0 Temperature Monticello Reservoir January 10, 2018 0.4 1 2 3 4 5 6 7 8 9 10 1112 13 14-" 15 16 17 18 19 20 21 22 23 24 25 Depth (m) * -e-1ntake 2 ....._Discharge 6 ....... UplakeJ: 6 6 Figure 3. 40.0 35.0 u 0 -; 30.0 ... :i .., (tl ... a.> E 25.o a.> f-20.0 15.0 Temperature Monticello Reservoir July 18, 2018 0.3 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Depth (m) _._Intake 2 _._Discharge 6 _._Uplakel6 7 Figure 4. 8.0 ::, 7.5 J: a.. 7.0 pH Monticello Reservo i r January 10, 2018 0.4 1 2 3 4 5 6 7 8 9 10 1112 13 1 4 15 16 17 18 19 20 21 22 23 24 25 Depth {m) -e-l ntake 2 -+-D i scharge 6 -+-Up l ake 16 8 Figure 5. 10.0 9.0 ::::, vi 8.0 ::i:: Cl. 7.0 6.0 pH Mont i ce ll o Reser v oi r July 18 , 2018 0.3 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 2 1 22 23 24 25 Depth (m) -+-Intake 2 -+-Discharge 6 ...._Uplake 16 9 Figure 6. QC 11.0 E 10.0 C fili x 0 "O Q) -2! 0 9.0 "' "' ci 8.0 Dissolved Oxygen Monticello Reservoir January 13, 2017 0.3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Depth (m) -+-Intake 2 ..... Discharge 6 ..... Uplake 16 10 Figure 7. ::;-QO E C: Q) QO >-X 0 "C Q) .2 0 V, .!Q Cl 10.0 9.0 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 Dissolved Oxygen Monticello Reservoir July 18, 2018 0.3 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 2 4 25 Depth (m) -+-Intake 2 -+-Dis c harge 6 ..._Uplake 16 11 Table 1. 2018 Monticello Reservoir Water Quality , Site: Intake 2 January 10, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.4 11.3 91 10.0 7.7 1 11.3 91 10.0 7.6 2 11.3 91 10.0 7.6 3 11.2 91 9.9 7 .. 6 4 11.1 91 9.9 7.6 5 11.0 91 9.9 7.6 6 10.9 91 9.9 7.5 7 10.8 91 10.0 7.5 8 10.8 91 10.0 7.5 9 10.8 91 10.0 7.5 10 10.7 91 10.1 7.5 11 10.7 91 10.1 7.5 12 10.6 91 10.1 7.5 13 10.6 91 10.1 7.5 .. 14 . 10.6 91 10.1 7.5 15 10.6 91 10.1 7.5 16 10.6 91 10.2 7S 17 10.5 91 10.2 7.5 18 10.5 91 10.2 7.5 19 10.4 91 10.2 7.5 20 10.3 91 10.2 7.5 21 10.1 91 10.3 7.5 22 10.0 91 10.3 7.5 23 10.0 91 10.3 7.5 24 9.9 92 10.3 7.4 25 9.9 92 9.5 7.4 Sampling start time 1325 hours0.0153 days <br />0.368 hours <br />0.00219 weeks <br />5.041625e-4 months <br /> EST 12 Table 2. 2018 Monticello Reservoir Water Quality Site: Discharge 6 January 10, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 19.5 92 9.8 7.5 1 15.5 91 9.8 7.5 2 .11.2 91 9.7 7.5 3 11.1 91 9.7 7.5 4 11.1 91 9.6 7.5 5 11.1 91 9.6 7.5 6 11.0 91 9.6 7.5 7 11.0 91 9.6 7.4 8 11.0 91 9.6 7.4 9 11.0 91 9.6 7.4 10 11.0 91 9.5 7.4 11 11.0 91 9.5 7.4 12 11.0 91 9.4 7.4 13 11.0 91 9.4 7.4 -. 14 11.0 91 9.2 7.4 ,. Sampling start time 1355 hours0.0157 days <br />0.376 hours <br />0.00224 weeks <br />5.155775e-4 months <br /> EST 13 Table 3. 2018 Monticello Reservoir Water Quality Site: Uplake 16 January 10, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.4 12.6 91 10.6 7.6 1 12.5 91 10.6 7.6 2 12.4 91 10.5 7.6 3 12.1 91 10.3 7.6 4 12.1 91 10.2 7.6 5 11.9 91 10.2 7.6 6 11.5 91 10.3 7.6 7 11.5 91 10.2 7.6 8 11.4 91 10.3 7.6 9 11.3 91 10.3 7.6 10 11.0 91 10.2 7.6 11 10.5 91 10.1 7.6 12 10.4 91 10.2 7.6 13 ... 10.4 91 10.2 7.6 14 10.3 91 10.3 7.6 15. 10.2. 91 10.3 7.6 16 10.1

  • 91 10.4 7.6 17 10.1 91 10.4 7.6 17 10.1 91 10.4 7.6 18 10.1 91 10.3 7.6 19 10.1 91 10.3 7.6 Sampling start time 1431 hours0.0166 days <br />0.398 hours <br />0.00237 weeks <br />5.444955e-4 months <br /> EST 14 Table 4. 2018 Monticello Reservoir Water Quality Site: Intake 2 February 15, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. OA 12.8 85 10.3 7.4 1 12.7 85 10.3 7.4 2 12.6 85 10.3 7.4 3 12.5 85 10.3 7.4 4 12.4 85 10.3 7.4 5 12.3 85 10.2 7.4 6 12.0 84 10.1 7.4 7 11.2 83 9.8 7.4 8 10.9 83 9.7 7.3 9 10.9 83 9.7 7.3 10 10.8 83 9.6
  • 7.2 11 10.8 83 9.6 7.2 12 10.7 84 9.7 7.2 13 10.4 84-9.6 7.2 14 10.4 84 9.5 7.2 15 10.2 85 9.4 . 7.2 16 10.1 85 9.4 '" 7.1 17 10.0 85 9.3 7.1 18 10.0 84 9.2 7.1 19 10.0 85 9.2 7.1 19.4 10.0 85 9.2 7.1 Sampling start time 1341 hours0.0155 days <br />0.373 hours <br />0.00222 weeks <br />5.102505e-4 months <br /> EST 15 Table 5. 2018 Monticello Reservoir Water Quality Site: Discharge 6 February 15, 2018 Depth Temp SpCond DO pH m. oc uS/cm mg/L s.u. 0.4 19.1 . 86 10.0 7.3 1 18.0 87 10.1 7.4 2 14.6 87 10.3 7.4 3 12.8 87 10.4 7.5 4 12.8 87 10.4 7.5 5 12.3 87 10.2 7.5 6 11.8 87 10.1 7.5 7 11.8 87 10.0 7.4 8 11.6 87 10.0 7.4 9 11.5 87 9.9 7.4 10 11.3 87 9.8 7.4 11 11.1 87 9.8 7.4 12 10.8 87 9.3 7.3 13 10.4 87 $.9 7.3 . 13.3 10.3

' 87 8.7 7.2 Sampling start time 1409 hours0.0163 days <br />0.391 hours <br />0.00233 weeks <br />5.361245e-4 months <br /> EST 16 Table 6. 2018 Monticello Reservoir Water Quality Site: Uplake 16 February 15, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. .0.5 13.7 89 11.1

  • 8.1 1 13.7 89 11.1 8.2 2 13.6 89 11.1 8.2 3 13.6 89 11.2 8.2 4 13.6 89 11.2 8.3 5 13.6 89 11.1 8.2 6 13.5 89 11.1 8.2 7 13.5 89 11.1 8.2 8 13.5 89 11.1 8.2 .9 13.5 89 11.1 8.2 10 12.1 89 10.5 8.1 11 11.7 89 10.3 7.8 12 11.5 89 10.2 7.7 13 , 10.9 89 9.8 . 7.6 14 10.6 90 9.4 7.5 15 10.4 89 9.1 7.4 16 10.3 89 8.8 7.3 17 10.2 89 8.5 7.2 18 10.1 89 8.2 7.2 19 10.1 89 8.1 7.1 20 10.1 89 8.1 7.1 21 10.1 89 8.0 7.0 Sampling start time 1446 hours0.0167 days <br />0.402 hours <br />0.00239 weeks <br />5.50203e-4 months <br /> EST 17 Table 7. 2018 Monticello Reservoir Water Quality Site: Intake 2 March 16, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 13.2 84 10.1 7.6 1 13.1 84 10.1 7.6 2 13.1 84 10.1 7.6 3 13.0 84 10.0 7.6 4 12.9 84 9.9 7.6 5 13.0 84 10.0 7.6 6 12.9 84 9.9 7.6 7 12.9 84 9.9 7.5 8 12.9 84 9.9 7.5 9 12.9 84 9.8 7.5 10 12.9 84 9.8 7.5 11 12.9 84 9.8 7.5 12 12.9 84 9.8 7.5 13 12.9~ 84 , 9.7 7.5 14 12.9 84 9.7 7.4 15 12.8 84 9.6 7.4 16 12.8 84 9.6 7.4 17 12.8 84 9.6 7.4 18 12.8 84 9.4 7.4 18.5 12.8 84 9.4 7.3 Sampling start time 1006 hours0.0116 days <br />0.279 hours <br />0.00166 weeks <br />3.82783e-4 months <br /> EST. 18 Table 8. 2018 Monticello Reservoir Water Quality Site: Discharge 6 March 16, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 22.0 85 9.7 7.5 1 17.4 85 9.8 7.5 2 13.5 84 9.9 7.5 3 13.4 84 9.7 7.5 4 13.4 84 9.6 7.5 5 13.4 84 9.6 7.5 6 13.4 84 9.6 7.5 7 13.3 84 9.6 7.4 8 13.3 84 9.6 7.4 9 13.3 84 9.5 7.4 10 13.3 84 9.4 7.4 11 13.3 84 9.2 7.4 11.2 13.3 84 9.1 7.4 . Sampling start time 1043 hours0.0121 days <br />0.29 hours <br />0.00172 weeks <br />3.968615e-4 months <br /> EST. 19 Table 9. 2018 Monticello Reservoir Water Quality Site: Uplake 16 March 16, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 13.5 85 10.1 7.7 1 13.4 85 10.1 7.7 2 13.2 85 10.2 7.7 3 13.0 85 10.0 7.7 4 13.0 85 9.8 7.6 5 13.0 85 9.7 7.6 6 13.0 85 9.6 7.5 7 13.0 85 9.6 7.5 8 13.0 85 9.5 7.4 9 13.0 85 9.5 7.4 10 . 12.9 85 9.5 7.4 11 12.9 85 9.6 7.4 12 12.9 85 9.6 7.4 13 12.9 85 9.6 7.4 14 12.9 85 9.6 7.4 15 12.9 85 9.5 7.4 16 12.9 85 9.5 7.4 17 12.9 85 9.5 7.4 18 12.9 85 9.5 7.4 19 12.8 85 9.4 7.4 20 12.7 85 9.1 7.4 21 12.5 86 8.0 7.2 22 12.4 87 7.7 7.2 23 12.4 87 7.1 7.1 23.1 12.4 87 6.8 6.9 Sampling start time 1228 hours0.0142 days <br />0.341 hours <br />0.00203 weeks <br />4.67254e-4 months <br /> EST 20 Table 10. 2018 Monticello Reservoir Water Quality Site: Intake 2 April 5, 2018 DO Depth Temp SpCond Cone. pH m oc uS/cm mg/L s.u. 0.3 17.0 84 9.7 7.7 1 16.9 84 9.7 7.7 2 16.5 84 9.7 7.7 3 16.4 84 9.7 7.7 4 16.4 84 9.7 7.8 5 16.3 84 9.5 7.7 6 16.3 84 9.5 7.7 7 16.3 84 9.5 7.6 8 16.3 84 9.5 7.6 9 16.1 84 9.4 7.6 10 16.0 84 9.3 7.6 11 15.9 84 9.2 7.5 .. -12 15.3 84 8.8
  • 7.5 13 15.0 84 8.6 7.4 14 14.3 85 8.2 7.3 15 14.0 84 7.9 7.2. 16 13.8 85 7.8 7.2 17 13.8 84 7.9 7.1 18 13.7 84 7.8 7.1 19 13.7 85 7.6 7.1 20 13.6 84 7.7 7.1 21 13.4 84 7.5 7.1 22 13.4 85 7.2 7.1 Sampling start time 1218 hours0.0141 days <br />0.338 hours <br />0.00201 weeks <br />4.63449e-4 months <br /> EST 21 Table 11. 2018 Monticello Reservoir Water Quality Site: Discharge 6 April 5, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 25.2 86 9.4 7.6 1 20.1 85 9.8 7.6 2 17.1 84 10.0 7.7 3 17.0 84 9.7 7.7 4 16.9 84 9.6 7.7 5 16.8 84 9.7 7.6 6 16.5 84 9.6 7.6 7 16.5 84 9.6 7.6 8 16.0 84 9.4 7.6 9 15.6 84 9.2 7.5 10 15.2 84 9.0 7.4 11 15.0 84 8.9 7.4 12 14.9 84 8,7 7.3 .. 12.2 14.9 84 8.7 7.3 Sampling start time 1247 hours0.0144 days <br />0.346 hours <br />0.00206 weeks <br />4.744835e-4 months <br /> EST 22 Table 12. 2018 Monticello Reservoir Water Quality Site: Uplake 16 April 5, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.4 18.4 85 10.7 8.7 1 17.9 85 10.8 8.8 2 17.6 85 10.7 8.7 3 17.3 85 10.7 8.7 4 16.9 84 10.5 8.5 5 15.2 84 9.4 8.1 6 14.7 84 9.0 7.8 7 14.4 84. 8.8 7.6 8 14.3 84 8.7 7.5 9 14.2 84 8.7 7.4 10 14.1 85 8.7 7.3 11 14.0 85 8,6 7.3 . -12 13.9 85 8.6 7.3 13 13.8 85 8.4 7.3 14** 13-.5 86 . 8.1 7.2 15 13.4 86 8.1 7.2 16 13.4 86 7.9 7.2 17 13.4 86 7.8 7.2 18 13.3 86 7.6 7.1 19 13.3 86 7.6 7.1 20 13.3 86 7.6 7.1 21 13.3 86 7.5 7.1 22 13.1 86 6.6 7.0 23 13.0 87 5.9 7.0 23.6 13.1 92 2.7 6.8 Sampling start time 1324 hours0.0153 days <br />0.368 hours <br />0.00219 weeks <br />5.03782e-4 months <br /> EST 23 Table 13. 2018 Monticello Reservoir Water Quality Site: Intake 2 May 9, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s,u. 0.3 22.6 82 8.5 7.9 1 21.5 82 7.9 7.8 2 21.0 82 7.6 7.6 3 20.9 82 7.4 7.5 4 20.6 82 7.2 7.4 5 20.3 82 7.1 7.3 6 19.8 81 6.8 7.2 7 19.7 81 6.7 7.1 8 19.4 81 6.6 7.1 9 19.4 81 6.6 7.1 10 19.4 81 6.6 7.1 11 19.3 81
  • 6.6 7.1 12 18.5 82 6.2 .. 7.0 13 18.2 81 6.1 7.0 14 17.8 82 . 6.0 6.9 .. 15
  • 16.6 83 5.4 6.9 16 16.3 83 5.3 6.9 17 15.9 84 5.0 6.8 18 15.5 84 4.7 6.8 19 15.3 84 4.5 6.8 20 15.0 85 4.4 6.8 21 14.8 85 4.3 6.8 22 14.2 86 3.9 6.75 23 13.4 87 3.2 6.7 24 13.4 87 3.1 6.7 25 13.3 87 3.0 6.7 25.4 13.3 88 2.8 6.7 Sampling start time 0923 hours0.0107 days <br />0.256 hours <br />0.00153 weeks <br />3.512015e-4 months <br /> EST 24 Table 14. 2018 Monticello Reservoir Water Quality Site: Discharge 6 May 9, 2018 Depth Temp SpCond DO pH m oc us/cm mg/L s.u. 0.3 30.0 84 7.5 7.3 1 '25.9 83 8.8 8.1 2 23.0 83 9.4 8.7 3 22.6 83 9.2 8.6 4 22.0 82 8.5 8.2 5 21.3 82 7.9 7.8 6 19.5 82 7.0 7.5 7 18.9 81 6.7 7.4 8 18.8 81 6.6 7.3 9 18.6 81 6.3 7.2 10 18.5 81 6.3 7.1 11 18.3 81 6.1 7.1 12 18.2 81 5.8 7.1 13: 17.9 81 5.4 7.0 Sampling-start time 1002 hours0.0116 days <br />0.278 hours <br />0.00166 weeks <br />3.81261e-4 months <br /> EST 25 Table 15. 2018 Monticello Reservoir Water Quality Site: Uplake 16 May 9, 2018 Depth Temp SpCond DO pH m oc. uS/cm mg/L s.u. 0.4 23.8 86 10.4 9.2 1 23.4 86 10.6 9.3 2 23.1 86 10.6 9.3 3 22.9 85 10.2 9.2 4 22.5 85 10.3 9.2 5 22.1 84 9.9 9.0 6 20.5 82 8.1 8.2 7 19.9 82 7.6 7.8 7 19.9 82 7.6 7.8 8 19.5 82 7.5 7.6 9 19.1 . 81 7.2 7.5 10 18.8 82 6.9 7.4 11 18.5 82 6.7 7.3 12 18.3 82 .. 6.5 7.2 13 18.1 82 6.2 7.1 14 18.0 82 6.1 7.1 15 -17.8 83 5.8 7.1
  • 16 17.6 83 5.8 7.0 17 17.4 83 5.4 7.0 18 17.1 84 5.0 7.0 19 16.9 84 4.7 6.9 20 16.6 84 4.3 6.9 21 16.4 85 3.7 6.8 22 15.8 86 3.0 6.8 23 15.2 88 2.1 6.7 24 14.6 91 1.0 6.7 25 14.5 100 0.4 6.7 Sampling start time 1042 hours0.0121 days <br />0.289 hours <br />0.00172 weeks <br />3.96481e-4 months <br /> EST 26 "

Table 16. 2018 Monticello Reservoir Water Quality Site: Intake 2 June 11, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u . 0.4 .25.6 72 6.0 7.3 1 25.4 72 5.9 7.2 2 25.2 72 5.7 7.1 3 25.1 72 5.5 7.1 4 25.0 72 5.5 7.0 5 25.0 72 5.4 7.0 6 24.9 72 5.4 7.0 7 24.7 73 5.3 7.0 8 24.5 73 5.1 6.9 9 24.4 73 5.0 6.9 10 24.1 73 4.9 6.9 11 24.0 73 4.8 6.9 12 23.8 73 4.7 6.9 13 23.S. 73 4.6 6.9 14 23.1 74 4.3 6.8 15 22.9 75 4.3 6.8 16 22.8

  • 75 4.1 6.8 17 22.6 75 4.0 6.8 18 21.8 77 3.7 6.8 19 21.6 77 3.6 6.8 20 21.3 78 3.5 6.7 21 21.1 78 3.4 6.7 22 20.5 79 3.2 6.7 Sampling start time 1011 hours0.0117 days <br />0.281 hours <br />0.00167 weeks <br />3.846855e-4 months <br /> EST 27 Table 17. 2018 Monticello Reservoir Water Quality Site: Discharge 6 June 11, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 34.0 74 5.6 7.1 1 31.3 73 6.4 7.2 2 27.4 72 7.9 8.1 3 26.9 72 7.4 8.1 4 25.6 72 5.6 7.6 5 25.0 71 5.2 7.3 6 24.8 71 4.9 7.2 7 24.7 71 4.8 7.1 8 24.6 71 4.8 7.0 9 24.5 71 4.8 7.0 10 24.4 71 4.7 6.9 11 24.2 71 4.6 6.9 Sampling start time 1044*hours EST 28 Table 18. 2018 Monticello Reservoir Water Quality Site: Uplake 16 June 11, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.4 29.8 82 9.6 9.5 1 29.8 82 9.7 9.5 2 29.5 82 9.6 9.5 3 29.5 81 9.6 9.4 4 29.1 80 9.2 9.4 5 25.1 71 4.6 8.3 6 24.6 71 4.0 7.9 7 24.5 71 4.3 7.5 8 24.3 71 4.3 7.3 9 24.3 71 4.3 7.2 10 24.2 71 4.2 7.1 11 23.8 71 3.1 7.0 12 23.6 72 3.0 6.9 13 23.5 73 2.8 6.8 14 .. 23.4 ... 74 2.5 6.8 15 23.1 75 2.3 6.8 16 23.0 75 2.2 . 6.7 17 22.7 77 1.9 6.7 18 22.5 78 1.8 6.7 19 22.3 79 1.6 6.7 20 21.8 81 1.2 6.7 20.2 21.6 82 1.1 6.7 Sampling start time 1121 hours0.013 days <br />0.311 hours <br />0.00185 weeks <br />4.265405e-4 months <br /> EST 29 Table 19. 2018 Monticello Reservoir Water Quality Site: Intake 2 July 18, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 28.9 72 6.6 7.8 2 28.7 72 6.7 7.7 3 28.5 72 5.9 7.3 4 28.4 72 5.8 7.2 5 28.4 72 5.7 7.2 6 28.3 73 5.5 7.1 7 28.1 73 4.9 7.0 8 28.0 73 4.6 7.0 9 28.0 73 4.6 6.9 10 28.Q 73 4.6 6.9 11 28.0 73 4.6 6.9 12 28.0 73 4.6 6.9 13
  • 28.0 73 4.5. 6.9 14 28.0 73 4.5. 6.9 15 27:9 73 4.3 6.9 16 27.9 73 4.3 6.9 17 27.9 73 4.1 6.9 18 27.8 73 4.0 6.9 19 27.8 73 4.0 6.9 20 27.8 73 3.9 6.8 21 27.2 74 3.5 6.8 22 22.5 77 0.6 6.6 23 21.2 78 0.2 6.5 24 20.3 80 0.2 6.4 25 18.0 87 a.a 6.6 Sampling start time 1123 hours0.013 days <br />0.312 hours <br />0.00186 weeks <br />4.273015e-4 months <br /> EST 30 Table 20. 2018 Monticello Reservoir Water Quality Site: Discharge 6 July 18, 2018 Depth Temp SpCond DO pH m oc
  • uS/cm mg/L s.u. 0.5 37.0 74 4.9 7.1 1 31.1 73 7.2 7.8 2 29.3 72 6.9 7.8 3 29.0 72 7.0 7.9 4 28.7 72 5.2 7.5 5 28.4 72 4.7 7.4 6 28.3 72 4.2 7.2 7 28.1 72 3.3 7.0 8 27.9 72 2.6 6.9 9 . 27.8 72 2.2 6.9 10 27.8 72. 1.9 6.8 11 27.8 72 1.8 6.8 12 27.7 73 1.6 6.8 Sampling start time 1201 hours0.0139 days <br />0.334 hours <br />0.00199 weeks <br />4.569805e-4 months <br /> EST 31 Table 21.* 2018 Monticello Reservoir Water Quality Site: Uplake 16 July 18, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.4 30.4 75 9.5 9.2 1 30.2 75 9.7 9.3 2 29.8 75 9.7 9.3 3 29.5 74 9.2 9.2 4 29.3 73 8.1 9.0 5 29.0 72 7.2 8.7 6 28.4 72 4.5 7.8 7 28.0 72 2.8 7.4 8 27.8 72 2.5 7.2 9 27.8 72 2.5 7.0 10 27.8 72 2.2 7.0 11 27.7 72 1.9 6.9 12 27.5 72 1.0 6.8 13 27.5 72 0.8 6.8 14 27.4 72 0.7. 6.7 15 27.4 72 0.5 6.7 16 27.3 72 0.2 6.7 17 27.2 72 0.1 6.7 18 27.2 72 0.0 6.7 19 27.0 73 0.0 6.7 20 26.8 73 0.0 6.7 21.0 26.5 73 0.0 6.7 22 25.9 75 0.0 6.7 23 25.1 81 0.0 6.7 24 23.7 90 0.0 6.8 Sampli11g start time 1239* hours EST 32 Table 22. 2018 Monticello Reservoir Water Quality Site: Intake 2 August 15, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 29.5 71 7.6 8.3 1 29.2 71 6.8 7.6 2 28.9 72 5.7 7.3 3 28.8 72 5.4 7.2 4 28.8 72 5.3 7.1 5 28.8 72 5.3 7.1 6 28.7 72 5.1 7.1 7 28.7 72 5.1 7.0 8 28.7 72 5.2 7.0 9 28.7 72 5.1 7.0 10 28.7 72 5.1 7.0 11 28.7 72 5.0 7.0 12 28.7 72 4.9 7.0 13 28.6 72 4.9 7.0 14 28.5 72 4.8 7.0 15 28.5 72 4.8 6.9 16 . 28.5 72 4.8 6.9 17 28.2 72 4.5 6.9 18 28.1 72 4.2 6.8 19 27.8 73 3.7 6.8 20 27.6 73 2.9 6.8 21 27.3 73 3.0 6.7 22 27.0 74 3.1 6.7 22.3 26.9 74.4 3.0 6.7 Sampling start time 0942 hours0.0109 days <br />0.262 hours <br />0.00156 weeks <br />3.58431e-4 months <br /> EST 33 Table 23. 2018 Monticello Reservoir Water Quality Site: Discharge 6 August 15, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 36.8 73 5.4 7.1 2 29.8 71 7.4 7.9 3 29.3 71 5.4 7.3 4 29.0 71 5.0 7.1 5 29.0 71 4.9 7.0 6 28.8 71 3.8 6.9 7 28.6 71 3.5 6.8 8 28.5 71 3.4 6.8 9 28.5 71 3.2 6.7 10 28.4 71 3.0 6.7 11 28.4 71 2.9 6.7 12 28.4 71 2.8 6.7 13 28.4 71 2.5 6.6" 14 28.3 .. 71 2.4 6.6 Sampling start time 1031 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.922955e-4 months <br /> EST 34 Table 24. 2018 Monticello Reservoir Water Quality Site: Uplake 16 August 15, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 31.0 74 8.5 8.9 1 30.6 74 8.6 8.9 2 30.5 75 8.9 9.0 3 30.3 75 8.7 9.0 4 30.2 73 7.3 8.6 5 29.0 72 2.9 7.6 6 28.8 72 3.1 7.1 7 28.5 71 3.3 6.9 8 28.5 71 3.4 6.9 9 28.4 71 3.0 6.8 10 28.4 71 2.9 6.7 11. 28.4 71 2.6 6.6 12 28.3 71 2.5 '. 6.6 **-13 28.2 72 1.9 6.6 14 28.1 73 1.0 6.5 15 28.1 73 0.5 6.5 16 28.0 74 0.1 6.5 17 27.9 75 0.0 6.5 18 27.9 75 0.0 6.5 19 27.8 75 0.0 6.5 20 27.7 76 0.0 6.5 21 27.6 76 0.0 6.5 22 27.4 77 Q.O 6.5 23 27.3 78 0.0 6.4 24 26.6 88 0.0 6.4 25 24.8 118 0.0 6.6 Sampling start time 1112 hours0.0129 days <br />0.309 hours <br />0.00184 weeks <br />4.23116e-4 months <br /> EST 35 Table 25. ' 2018 Monticello Reservoir Water Quality Site: Intake 2 September 5, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 29.7 75 6.0 7.5 1 . 29.4 76 5.2 7.2 2 29.3 76 4.9 7.1 3 29.2 76 4.7 7.1 4 29.2 77 4.6 7.0 5 29.2 77 4.5 7.0 6 29.2 77 4.5 7.0 7 29.2 77 4.5 7.0 8 29.2 77 4.4 7.0 9 29.2 77 4.4 7.0 10 29.1 77 4.2 6.9 11 29.1 77 4.2 6.9 12 29.1 77 4.1 6.9 13. 29.0 77 :4,0 6.9 14* 29:0 76 3.9 6.9 15 29.0 76 3.8 6.9 16 28.9 76" 3.8 6.9 17 28.9 77 3.7 6.9 18 28.9 78 3.8 6.9 19 28.9 78 3.8 6.8 20 28.8 78 3.7 6.8 21 28.6 77 3.5 6.8 22 28.0 78 3.1 6.8 23 27.3 79 2.4 6.7 24 25 81 0.8 6.7 25 21.3 88 0.1 6.7 25.3 21.2 93 0.1 6.6 Sampling start time*1012 hours EST 36 Table 26. 2018 Monticello Reservoir Water Quality Site: Discharge 6 September 5, 2018 Depth Temp SpCond DO pH m oc us/cm mg/L s;u. 0.3 37.2 78 5.1 7.0 1 32.4 76 6.3 7.3 2 29.9 75 6.6 7.4 3 29.9 75 6.5 7.4 4 29.8 75 6.4 7.3 5 29.6 75 5.8 7.1 6 29.5 76 5.5 7.0 7 29.4 76 5.2 7.0 8 29.3 76 4.6 6.9 9 29.1 76 4.0 6.8 10 29.0 75 3.7 6.7 11 28.9 75 3.1 6.7 12 28.8 75 2.9 6.6 Sampling start time 1042 *EST 37 Table 27. 2018 Monticello Reservoir Water Quality Site: Uplake 16 September 5, 2018 Depth Temp SpCond DO pH m oc us/cm mg/L s.u. 0.3 30.7 76 8.8 8.8 1 30.7 76 8.8 8.9 2 30.6 76 8.7 8.9 3 30.4 76 8.5' 8.9 4 30.3 75 8.1 8.8 5 29.1 75 3.9 7.6 6 28.7 75 3.1 7.0 7 28.7 75 3.1 6.8 8 28.7 75 3.1 6.8 9 28.7 75 3.0 6.7 10 28.7 75 3.0 6.6 11 28.6 75 2.8 6.6 12, 28.6. 74 2.8 6.6
  • 13 28.5 74 2.6 6.6 14 28.4 74 2.4 6.5 15 28.3 73 2.2 6.5 16 28.3 73 2.1 6.5 17 28.2 74 1.7 6.5 18 28.2 73 1.6 6.5 19 28.2 74 1.5 6.5 20 28.2 74 1.2 . 6.5 21 28.1 74 0.7 6.5 22 28.0 75 0.2 6.4 23 27.9 75 0.1 6.4 24 27.9 75 0.1 6.4 Sampling start time 1120 hours0.013 days <br />0.311 hours <br />0.00185 weeks <br />4.2616e-4 months <br /> EST 38 Table 28. I 2087 Monticello Reservoir Water Quality Site: Intake 2 October 5, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.4 27.1 76 6.3 7.1 1 27.1 76 6.2 7.1 2 27.1 76 6.2 7.2 3 27.1 76 6.2 7.2 4 27.1 77 6.2 7.2 5 27.1 76 6.3 7.2 6 27.1 76 6.3 7.2 7 27.0 76 6.3 7.3 8 27.0 76 6.4 7.3 9 26.9 76 6.4 7.3 10 26.9 76 6.4 7.3 11 26.9 76 6.4 7.3 12 26.9 76 6.4 7.3 13 26.9 76 6.4. 7.3 14 26.9 76 6.4 7.2 15 26.9 76 6.4 7.2 *16 26.9 76 6.4 7.2 17 26.8 76 6.4 7.2 18 26.8 76 6.3 7.2 19 26.8 76 6.2 7.2 20 26.7 76 6.2 7.2 21 26.7 76 6.1 7.2 22 26.7 76 6.1 7.2 23 26.7 76.1 6.1 7.2 24 26.7 76.3 6.0 7.2 Sampling start time 0957 hour0.0111 days <br />0.266 hours <br />0.00158 weeks <br />3.641385e-4 months <br />.s EST 39 Table 29. 2018 Monticello Reservoir Water Quality Site: Discharge 6 October 5, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 34.6 78 5.6 7.2 1 29.7 77 5.7 7.2 2 27.5 76 5.4 7.2 3 27.4 76 4.8 7.1 4 27.4 77 4.9 7.1 5 27.3 77 4.7 7.0 6 27.3 77 4.7 7.0 7 27.3 77 4.7 7*.0 8 27.2 77 3.8 6.9 9 27.2 76 3.4 6.8 10 27.1 77 3.2 6.7 11 27.1 76 3.0 6.7 12 27.1 76 2.9 6.7 Sampling start time 1031 hours0.0119 days <br />0.286 hours <br />0.0017 weeks <br />3.922955e-4 months <br /> EST 40 Table 30. 2018 Monticello Reservoir Water Quality Site: Uplake 16 October 5, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 29.5 79 11.1 9.2 1 28.9 79 10.8 9.2 2 28.7 79 10.5 9.1 3 28.6 79 10.6 9.1 4 28.1 78 8.7 8.8 5 27.7 77 6.9 8.3 6 27.4 77 4.4 7.8 7 27.3 76 3.2 7.5 8 27.2 76 2.9 7.3 9 27.2 76 3.5 7.2 10 27.2 77 3.6 7.1 11 27.1 77 3.3 7.0 12 27.1 76 3.2 6.9 13 27.1 76 3.1. 6.9 14 27.1 76 3.2 6.9 *15 27.1 76 3.0 6.8: 16 27.0 76 2.4 6.8 17
  • 27.0 76 1.8 6.7 18 27.0 77 0.5 6.7 19 26.9 77 0.7 6.6 20 26.9 77 0.5 6.6 21 26.9 77 0.3 6.6 22 26.8 77 0.2 6.6 23 26.7 78 0.1 6.6 24 26.5 81 0.1 6.5 25 26.3 94 0.0 6.5 Sampling start time 1106 hours0.0128 days <br />0.307 hours <br />0.00183 weeks <br />4.20833e-4 months <br /> EST 41 Table 31. 2018 Monticello Reservoir Water Quality Site: Intake 2 November 21, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 16.2 74 8.4 7.4 1 16.2 74 8.3 7.3 2 16.1 74 8.2 7.3 3 16.1 74 8.2 7.3 4 16.1 74 8.2 7.3 5 16.1 74 8.2 7.3 6 16.1 73 8.2 7.3 7 16.1 73 8.2 7.3 8 16.1 73 8.2 7.3 9 16.1 73 8.1 7.3 10 16.1 74 8.1 7.3 11 16.1 74 8.1 7.3 12 16.1 74 8.1* 7.3 13 16.1 73 8.1 .* 7.3 14 16.1 73 8.1 7.3 15 16.1 73 8.1 7.3 16 16.1 73 . 8.1 7.3 17 16.1 74 8.1 7.3 18 16.1 74 8.1 7.3 19 16.0 73 8.1 7.3 20 16.0 73 8.0 7.2 21 15.6 72 8.0 7.2 22 15.6 72 8.0 7.2 23 15.4 71 8.1 7.2 24 14.8 70 7.0 7.0 24.2 14.8 72 0.7 7.0 Sampling start time 1018 hours0.0118 days <br />0.283 hours <br />0.00168 weeks <br />3.87349e-4 months <br /> EST 42 Table 32. 2018 Monticello Reservoir Water Quality Site: Discharge 6 November 21, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.4 16.2 74 8.3 7.3 1 16.2 74 8.3 7.3 2 16.2 74 8.2 7.3 3 16.2 74 8.3 7.3 4 16.2 74 8.2 7.3 5 16.1 74 8.2 7.3 6 16.1 74 8.2 7.3 7 16.1 74 8.3 7.3 8 16.1 74 8.2 7.3 9 16.0 74 8.2 73 10 16.0 74 *8.2 7.3 11 16.0 74 3.4 7.3 .. Sampling start time 1054 ~ours EST 43 Table 33. 2018 Monticello Reservoir Water Quality Site: Uplake 16 November 21, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 16.4 74 8.2 7.3 1 16.2 74 8.1 7.3 2 16.1 74 8.1 7.3 3 16.1 74 8.0 7.3 4 16.1 74 8.0 7.3 5 16.1 74 8.0 7.3 6 16.1 74 7.9 7.3 7 16.1 74 7.9 7.3 8 16.1 74 7.9 7.3 9 16.1 74 7.9 7.3 10 16.1 74 7.9 7.3 11 16.1 74 7.9 7.2 12 16.1 74 7.9 7.3 13 '16.1 74
  • 7.9 7.3 14 16.1 74 8.0 7.3 15 16.1 74 7.9
  • 7.3 16 16.1 74 8.0, 7.3 17 16.0 74 8.0 7.3 18 16.0 74 8.0 7.3 19 16.0 74 8.0 7.3 20 16.0 74 8.0 7.3 21 16.0 74 8.0 7.3 22 16.0 74 8.0 7.3 23 16.0 74 7.9 7.3 24 16.1 75 4.4 7.3 Sampling start time 113 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> EST 44 Table 34. 2018 Monticello Reservoir Water Quality Site: Intake 2 December 17, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 12.6 72 . 9.7 7.5 1 12.6 72 9.7 7.4 2 12.6 72 9.7 7.4 3 12.6 72 9.6 7.4 4 12.5 72 9.6 7.4 5 12.5 72 9.6 7.4 6 12.5 72 9.6 7.4 7 12.5 72 9.6 7.4 8 12.5 72 9.6 7.4 9 12.5 72 9.5 7.4 10 12.4 72 9.4 7.3 11 12.4 72 9.4 7.3 12 12.3 72 9.3
  • 7.3 .. 13 12.3 *
  • 72 9.3 7.3 . 14 12.1 71 9.4 7.3 15 11.9 71* 9.4 7.3
  • 16 11.8 71 9.5 7.3 17 11.7 70 9.5 7.3 18 11.7 70 9.6 7.2 19 11.5 69 9.7 7.2 20 11.4 69 9.7 7.2 21 11.4 69 9.7 7.2 22 11.4 69 9.7 7.2 23 11.3 69 9.5 7.2 Sampling start time 1041 hours0.012 days <br />0.289 hours <br />0.00172 weeks <br />3.961005e-4 months <br /> EST 45 Table 35. I 2018 Monticello Reservoir Water Quality Site: Discharge 6 December 17, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.4 21.0 73 9.4 7.4 1 15.4 73 9.4 7.4 2 12.7 72. 9.5 7.4 3 12.7 72 9.4 7.4 4 12.7 72 9.4 7.3 5 12.7 72 9.3 7.3 6 12.6 72 9.3 7.3 7 12.6 72 9.2 7.3 8 12.6 72. 9.1 7.3 9 12.5 72 9.0 7.3 10 12.5 72 8.9 7.2 11 12.5 72 8.8 7.2 12 12.4 72 8.7 7.2 13 12.4 72 8.5 7.2 14 12.3 72 8.2 7.1
  • Sampling start.time 1108 hours0.0128 days <br />0.308 hours <br />0.00183 weeks <br />4.21594e-4 months <br /> EST 46 Table 36. 2018 Monticello Reservoir Water Quality Site: Uplake 16 December 17, 2018 Depth Temp SpCond DO pH m oc uS/cm mg/L s.u. 0.3 13.3 72 9.9 7.5 1 12.9 72 9.8 7.5 2 12.8 72 9.8 7.5 3 12.6 73 9.7 7.4 4 12.5 73 9.6 7.4 5 12.4 73 9.5 7.4 6 12.4 73 9.5 7.4 7 12.4 73 9.5 7.4 8 12.4 73 9.5 7.4 9 12.4 73 9.5 7.4 10 12.4 73 9.5 7.4 11 12.3 73 9.4 7.4 12 12.3 73 9.4 7.4 13 12.3 73 9.4 7.4 14 12.3 73 . 9.4 7.4 15 12.3 73 9.3 7.4 16 12.3 73 9.3 7.4 17 12.3 73 9.3 7.3 18 12.3 73 9.2 7.3 19 12.3 73 9.2 7.3 20 12.3 73 9.0 7.3 21 12.3 73 9.0 7.3 22 12.3 73 8.9 7.3 23 12.3 73 8.9 7.3 24 12.4 75 6.0 7.1 Sampling start time 1144 hours0.0132 days <br />0.318 hours <br />0.00189 weeks <br />4.35292e-4 months <br /> EST 47 SC DHEC . Attachment X LTD 286, CR-18-04491 RC-19-0012 Page 1 of 364 316 (b) 40 CFR 122.21 (r) Submittal 316(b) 40 CFR 122.21(r)

Submittal VC Summer Station, Unit 1 Executive Summary SCE&G submits the following addendum along with the NPDES permit renewal application (permit #SC0030856) for the VC Summer Nuclear Station Unit1 (VCS). VCS is an existing nuclear-powered generating facility located on Monticello Reservoir in the Broad River basin near Jenkinsville, South Carolina.

This addendum contains studies and reports required to comply with the United States Environmental Protection Agency's (EPA) "Final Regulations to Establish Requirements for Cooling Water Intake

  • Structures at Existing Facilities" (Final §316b Rule, 40 CFR 122) dated August 15, 2014. The final §316b rule requires existing facilities to submit information needed to demonstrate to the NPDES permit Director how the facility will meet established standards for minimizing adverse environmental impact associated with the use of cooling water intake structures at existing facilities.

In accordance with 40 CFR 122 all existing facilities must submit to the Director for review the information required under paragraphs (r)(2)(Source Water Physical Data) and (r)(3)(Cooling Water Intake Structure Data) and c;1pplicable provisions of paragraphs (r)(4)(Source Water Baseline Biological Characterization Data), (r)(5) (Cooling Water System Data), (r)(6)(Chosen Method of Compliance with Impingement Mortality

  • Standard), (r)(7)(Entrainment Performance Studies), and (r)(8)(0perational Status). The owner or operator of an existing facility that withdraws greater than* 125 MG.D actual intake flow for cooling purposes must also submit to the Director the information.
  • required under paragraphs (r)(9)(Entrainment Characterization Study), (r)(1 O)(Cornprehensive Technical Feasibility and Cost Evaluation Study), (r)(11)(Benefits Valuation Study), (r)(12)(Non-water Quality Environmental and Other Impacts Study) and (r)(13)(Peer Review).
  • The source of cooling water for the VC Summer station is the Monticello Reservoir.

Monticello Reservoir was built in the Frees Creek valley in 1978 to serve as the upper pool for the Fairfield Pumped Storage Development and the cooling water source for VCSNS Unit 1 (NRC, 2004). The Monticello Reservoir and the cooling water system at VC Summer Station meets the definition of a "closed cooling water system" as defined in 40 CFR 125.92(c)(2) "Closed-cycle recirculating system includes a system with impoundments of waters of the U.S. where the impoundment was constructed prior to October 14, 2014 and created for the purpose of serving as part of the cooling water system as documented in the project purpose statement.

.. ". EPA and SCDHEC have confirmed their agreement with this assessment as noted in the attached correspondence.

Therefore, SCE&G intends to comply with the BTA (best technology available) standards for impingement using the existing closed-cycle recirculating system.

  • In accordance with rules outlined in 40 CFR 122, the permit Director (SCDHEC) has the right to waive the requirement for SCE&G to submit the information required under paragraphs (r)(9) through (r)(13) of this section. Prior to granting the waiver SCOH EC requested a 6-month Entrainment Cha'racterization Study to verify the data from previous studies. The 6-month study was conducted, peer reviewed and accepted by SCDHEC. On May 17, 2017, SCDHEC agreed to waive the requirements of (r)(9) .through (13) of 40 CFR 122. The results of this entrainment study and waiver communication are also included in this addendum.

~------------------------

From: Townley, Melanie [ma1lto:TOWNLEMK@dhec.sc.gov]

Sent: Tuesday, February 17, 2015 12:57 PM To: MOORE, MICHAEL S Cc: Thompson, G. Randall

Subject:

Fw: SC0030856 SCE&G/V C Summer Urnt 1 -316(b) ***This 1s an EXTERNAL email. Please do not click on a link or open any attachments unless you are confident it is from a trusted source

  • Michael, Please see the email response fro'm EPA below. Feel free to contact me with any additionarquestions.

Melanie K. Townley Environmental Engineer Associate Industrial Wastewater Permitting Section Bureau of Water-SCDHEC Phone:803/898-4223 Fax: 803/898-4215 townlemk@dhec.sc.gov From: Shell, Kame-Jo <Shell.Karrie-Jo@epa.gov>

Sent: Tuesday, February 17, 2015 12:41 PM To: Townley, Melanie Cc: Davis, Molly

Subject:

RE: SC0030856 SCE&G/V C Summer Urnt 1-316(b) Sorry. I thought we commented back on this one. Based on the ways the regs are written, they have a closed-loop recirculating system. KJ From: Townley, Melanie [mailto:TOWNLEMK@dhec.sc.govJ Sent: Tuesday, February 17, 2015 12:37 PM To: Shell, Karrie-Jo Cc: Davis, Molly

Subject:

Fw: SC0030856 SCE&G/V C Summer Unit 1-316(b) 1 Karrie-Jo, SCE&G has called wondering ifwe had heard back from you. Do you have an estimated date we would get a

  • response from you? Thanks! Melanie K. Townley Environmental Engineer Associate Industrial Wastewater Permitting Section Bureau ofWater-SCDHEC
  • Phone:803/898-4223 Fax:803/898-4215 townlemk@dhec.sc.gov From: Townley, Melanie Sent: Tuesday, January 20, 2015 11:01 AM To: Shell.Karrie-Jo@epa.gov Cc: davis.molly@epa.gov; Thompson, G. Randall

Subject:

SC0030856 SCE&G/V C Summer Unit 1 .. 316(b) Karrie-Jo, As discussed earlier this morning, SCE&G has requested that the we consider the Monticello Reservoir

a. *closed-cycle recirculating system-under the 316(b} existing facilities rule. I have attached their request for your review. Pleas~ .. provide yo~r c;letermination

~s to whether this meets the .d.efinition.

ot a closed-cycle recirculating system. -. Feel free to contact me with any questions.

Thanks in advance. Melanie K. Townley Environmental Engineer Associate Industrial Wastewater Permitting Section Bureau ofWater-SCDHEC Phone:803/898-4223 Fax:803/898-4215 townlemk@dhec.sc.gov 2

REESE. SUSAN B foHiS From: Sent To: Cc: Townley, Melanie <TOWNLEMK@dhec.sc.gov>

Wednesday, May 17, 2017 9:54 AM MOORE, MICHAEL S Thompson, G. Randall

Subject:

Re: Emailing:

Summer Station 2016 Ichthyo Final Report -2017 Additions.pdf

      • This is an EXTERNAL email. Please do not click on a link or open any attachments unless you are confident it is from a trusted source. Michael, After reviewing the results of the additional VC Summer Entrainment Study conducted in 20:J.6 and supplied in your March 13, 2017 email, the Department finds it acceptable to waive the application requirements in 122.21(r)(9)-(13) for this facility.

Feel free to contact me with any questions.

Melanie K. Townley Environment:il Engineer Associate S.C. Q~pt. of Health & Environmental Control Office: (803) 898-4223 Connect: www.scdhec.gov Facebook Linkedln -_hec . '! f ' I I r I I t l I I

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