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<br />i 1 1. Minimum solution volume to meet operational <br /> requirements; <br /> 2. A draindown volume equivalent to approximately 10 <br /> gallons per ton of ore in the active leaching area; <br />' , and <br /> 3. The combined runoff from the pad anti process area <br />' due to average climatic conditions and direct <br />i <br />it <br />ti <br />th <br />d <br />f <br />100 <br />24 <br /> prec <br />p <br />a <br />on on <br />e pon <br />s <br />rom a <br />-yr, <br />-hr <br /> storm event. <br />1 <br /> It is currently anticipated that an average irrigation rate <br />' of 0.005 gpm/ft will be used during heap leach operation. The <br /> heap will be irrigated using emitters rather than sprayers to <br />' allow for year-round leaching. For the completed heap, this <br /> corresponds to a maximum of 700 gpm or 1,008,000 gpd. <br />t The preceding assumptions yield the fol~owing design <br />storage volumes for the pond system: <br />1. Minimum normal working 1,000,000 gal <br />~ inventory <br />2. Total draindown 7,000,000 gal <br />' 3. 100-yr, 24-hr storm event runoff 4,175,000 gal <br />from leach pad, process area, and <br />direct precipitation on ponds <br />The total capacity of the pond system is calculated to <br />' be approximately 16.8 million gallons. This capacity is <br />adequate to contain the design inflow volumes plus the seasonal <br />' fluctuations with a minimum of two ft of freeboard. The <br />solution ponds are 20-ft deep, and have 3:1 internal side <br />slopes. The ponds are interconnected by a one-ft deep double- <br />' lined spillway. The average dimensions of the ponds are: <br />' 1. Pregnant pond 370 ft by 240 ft <br />2. Barren pond 340 ft by 255 ft <br />1 <br />' D-50 <br />