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ECOSA Evaluation AdrianBrown <br />5. CONCLUSION <br />The construction of the proposed redesigned ECOSA in the catchment basin of Grassy Valley will have <br />the following potential impacts on the quantity and quality of water resources: <br />• Temporary sequestering of precipitation falling on ECOSA to raise the moisture content of the <br />contained overburden to field capacity will reduce the flow of water from Carlton Tunnel by a <br />maximum of 83 gpm for a period expected to last through 2035. <br />• Temporary reduction of spring snowmelt and storm water runoff to Grassy Valley during <br />construction as a result of capture of incident precipitation by the un- reclaimed overburden will <br />reduce the spring snowmelt and stormwater flow in Grassy Valley by 2.3 acre feet per year <br />during the construction and operational period, ending in 2023. <br />• No impacts to water quality in surface water or saturated groundwater are expected to result <br />from the construction the proposed redesigned ECOSA in Grassy Valley at any time. <br />1385E.20120224 15 <br />