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ERC CC&V Water Balance User's Manual <br /> November 2019 <br /> individual ponds to optimize storage and operations. For this reason, reviewing results for total stored <br /> volume and total remaining capacity likely provide a more realistic impression of the overall water balance <br /> than results for the individual facilities. <br /> The above information is also available in the model by clicking on the "Water Priority Notes" button on <br /> the "Inputs"tab. <br /> VLF2 Phase 3 Pond Sizing <br /> Once the water balance model was completed, ERC ran the model using input data provided by CC&V to <br /> determine the storage capacity needed in the VLF2 Phase 3 pond. ERC ran two simulations of the expected <br /> production rates and site conditions from July 2019 through December 2032 to approximate how much <br /> water storage will be required at the PSSA (which is not planned to come online until October 2023).The <br /> first analysis ran the stochastic Monte Carlo precipitation simulation and produced a peak water volume <br /> in the pond of approximately 38.8 million gallons, occurring in August 2024. This scenario included <br /> extreme monthly precipitation depths as high as 8-10 inches in July of each year(the average July rainfall <br /> at the site is approximately 4.2 inches). Results from this simulation are shown in Figure 7. The second <br /> run used mean precipitation data and considered the effects of the 100-year storm event occurring <br /> simultaneously with the draindown from a 12-hour power outage. The peak water volume in the pond <br /> under these conditions was approximately 28.7 million gallons, in June 2024(shown in Figure 8). <br /> Figure 7 —VLF2 Phase 3 Pond Volume (Stochastic Water Balance Results) <br /> 4 Oe7 d Oe7 <br /> 3 Oe7 3 Oe7 <br /> rn <br /> E <br /> 0 <br /> 2 Oe7 2 Oe7 <br /> d <br /> fe <br /> 3 <br /> E <br /> 0 <br /> w <br /> 1 Oe7 1 Oe7 <br /> 0 0 <br /> 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 <br /> Time <br /> Statistics for EOM Water Volume <br /> Min 5"6r95°6 Max 5%95% ——— Mean — 50% <br /> 10 <br />