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imgation pond aze shown in Figures G.2-4 and G.2-5, respectively. The pond storage <br />• capacities at the maximum pool elevation (8168.0 ft-amsl) and at the statutory ground <br />elevation (8159.0 ft-amsl) are 158.5 acre-fl and 61.5 acre-ft, respectively, with a <br />corresponding above-grade (jurisdictional) storage capacity of 97.0 acre-feet. The <br />maximum pool azea (at elevation 8168.0 ft-amsl) is 11.8 acres. The statutory height <br />at the maximum embankment section is 9 feet, as shown on Detail A-A', Sheet 13 of <br />the Design Drawings. <br />The irrigation pond pool elevations for normal (April 1 through October 31 irrigation) <br />operating conditions aze summarized in Table G.2-1. From the results summarized in <br />Table G.2-1, at least 2 feet of freeboazd would be maintained under normal operating <br />conditions. A review of available hydrometerologic data indicates the ].00-year, 24- <br />hour storm at the site would result in 2.7 inches of precipitation (NOAA, 1973). <br />Upland storm water flow is routed azound the irrigation pond and only direct <br />precipitation would contribute to the pond volume. With the design freeboard, there <br />is ample capacity in the irrigation reservoir to prevent overtopping under a 100-yr, <br />• 24-hr storm event. <br />Both filling and drawdown of the pond will occur through a pumping vault. Details <br />of the pumping vault aze shown on Sheets 13 and 14 of the Design Drawings. During <br />pond filling, water from the West Pit ground water wells will be conveyed to the pond <br />through the irrigation pipeline. This pipeline will outfall into the pumping vault and <br />will be muted into the sump area of the pond through the intake pipes. Routing the <br />water to the low point of the pond (the sump azea) will reduce the potential for <br />erosion of the protective soil cover layer from water being routed along the pond <br />bottom. During pond drawdown, the flow in the intake pipe will be reversed, with <br />water flowing from the pond into the intake riser, and to the pumping vault, where it <br />will be delivered to the center-pivot irrigation systems by two designated pumps as <br />shown on Sheets I 1 and 12 of the Design Drawings. In order to reduce the amount of <br />sediment being drawn into the irrigation system, inflow into the intake riser will occur <br />through a gravel filter at low pool levels. <br /> <br />Battle Mountain Resources, Inc. G-5 Telesto Solutions, Inc. <br />P:~Pmjects~213-Newmvm(SWUis)VSanLUU\Permu Amevdmevt- Weu Pit Ma~ugement~PennitAmendmenLJJ.doc July 2006 <br />