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the irrigation demand is assumed to have a seasonal distribution with irrigation <br />beginning April 1 and continuing through October 31. <br />Estimates of evaporation from the pond were based on pan evaporation data from the <br />Western Regional Climate Center (WRCC; www.wrcc.dri.edu) for Alamosa, <br />Colorado. Pond evaporation was assumed to be equivalent to lake evaporation. Lake <br />evaporation was assumed to be 70 percent of measured pan evaporation, and equal to <br />37.7 inches per year with seasonal distribution occurring over the months from April <br />through October. The monthly pan evaporation is also shown in Figure G.2-2. <br />Seepage was estimated with the engineered liner system having a saturated hydraulic <br />conductivity less than 1x10.6 centimeters per second (cm/s). Stage-capacity curves <br />for the pond were used to estimate the seepage. <br />Results of the irrigation pond water balance modeling indicate that under normal <br />operating conditions, the average required storage (for the period from November <br />through March) is 134.4 acre-feet (Figure G.2-3). Average combined flow from the <br />West Pit and alluvial aquifer ground water wells is about 236 gallons per minute, with <br />seasonal peak flows occurring in late spring/eazly summer, and low flow during the <br />winter months. Precipitation inflows averaged approximately 9.9 acre-feet annually <br />to the pond, while evaporation removed about 19 acre-feet. Seepage resulted in an <br />additional 52.5 acre-feet reduction in the required pond volume. <br />G.2.2 Irrigation Pond Design <br />The configuration and design details for the irrigation pond are shown on Sheets 13 <br />and 14 of the Design Drawings (Appendix D). The criteria used in the design of the <br />irrigation pond include the following: <br />• The pond shall provide for safe storage of the design volume while <br />maintaining adequate (2 foot minimum) freeboard under normal operating <br />conditions. <br />• The pond design shall meet the requirements of the Office of the State <br />Engineer (SEO) for classification of the pond as anon-jurisdictional <br />Battle Mountain Resources, lnc. 17 Telesto Solutions, Inc. <br />P9Projects~212-Newmont(SeN.~is)\Sanl.uis~Permit Amendment - Wwt R~ Mviegemem\VA Repon & PUFSNermiiAmendmen~ v0.tl« October 2006 <br />