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ERC CC&V Water Balance user's Manual <br /> November 2019 <br /> Figure 8—VLF2 Phase 3 Pond Volume (Water Balance Results with Mean Monthly Precipitation and <br /> Effects of 100-year Storm and Draindown from 12-Hour Power Outage Considered) <br /> 3 Oe7 3 Oe7 <br /> 2 Oe7 2 Oe7 <br /> m <br /> rn <br /> EE <br /> 3 <br /> O <br /> C <br /> a <br /> 1 Oe7 1 0e7 <br /> 0 0 <br /> 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 203, 2032 2033 <br /> Time <br /> Statistics for Pond Volume <br /> Min '_o 95°o flax — 5% 95% ——— mean 50°6 <br /> NewFields has ensured that the Phase 3 pond design is capable of storing at least 47.8 million gallons of <br /> water,which guarantees a minimum of five feet of freeboard is maintained above the peak water volume <br /> determined by the GoldSim model, although they believe that the actual pond will be able to store more <br /> than this volume.As described above,the water balance model also assumes the VLF2 ponds are allowed <br /> to fill to their entirety before any water is stored in the VLF1 PSSAs, when in reality the mine will have the <br /> capability of diverting water to those facilities to lower the amount stored in VLF2, if desired, to manage <br /> surplus solution. <br /> Conclusions <br /> This memorandum is intended to accompany the GoldSim water balance model titled "09-24-19 CCV WB <br /> Model", created by ERC and be delivered to CC&V. It summarizes the model components, information on <br /> model structure, and model inputs and results. The document is intended to supplement instruction <br /> within the model itself. For additional assistance operating the GoldSim software, please refer to the <br /> GoldSim Help Topics (available under the "Help" pulldown in the model's toolbar or by pressing "F1"). <br /> Please contact ERC with any questions regarding the technical content of the model. <br /> ERC also used the completed GoldSim water balance model to aid NewFields in sizing the VLF2 Phase 3 <br /> PSSA. The maximum potential solution volume predicated to be stored over the lifetime of the PSSA by <br /> the model was found to be approximately 38.8 million gallons. Based on the water balance simulation <br /> 11 <br />