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3.2 MITIGATION REQUIREMENTS <br />;•. <br />Mitigation water will be needed to augment water rights <br />that might be impacted by mining. During the mining <br />operation, water will directly enter the pit from precip- <br />itation and seepage from the overburden aquifer, which is <br />primarily replenished by irrigation water that percolates <br />into the aquifer. Water levels in the vicinity of the pit <br />will be lowered by pumping of the water Prom the pit. Annual <br />inflow into the NUCLA EAST pit from the overburden aquifer <br />has been estimated to be 43.8 acre-feet (Reference 3) during <br />the fifth year of mining. At the end of five years, <br />drawdown of one foot in the overburden-aquifer water table <br />is estimated to occur at 0.7 miles from the center of the <br />~~• NUCLA EAST pit, and greater drawdown will occur at shorter <br />distances. The following should be noted: <br />a. The quantity of pit inflow and the areal extent <br />of the drawdown represent the fifth year of <br />operation. Mining in the earlier years will have a <br />smaller impact on the water levels, and inflow rates <br />will be lower. <br />b. Calculations used to estimate pit inflow do not <br />include the contributions resulting from irrigation <br />water percolating into the overburden aquifer in the <br />~~ <br />16 <br />GEOTRANS, INC. <br />