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4.2 After Mining <br /> Once mining is completed,the only loss will be an evaporative loss from the exposed water surface <br /> that the gravel mining operation creates. The evaporation rate is roughly 35 inches per year per <br /> acre.4 <br /> Annual evaporative depletion at mining completion from 25.9 acres of exposed water surface at the <br /> Birdseye Pit is calculated to be 70.3 acre-feet. <br /> Total annual depletions from the gravel mining operations are estimated to be 70.3 acre-feet during <br /> the post mining phase of the operation. <br /> 4 National Oceanic and Atmospheric Administration Technical Report N WS 33 Atlas—Evaporation Atlas for the <br /> Contiguous 48 United States <br /> Birdseye Pit l aeg t v wki and %smwtafo.NI I E <br /> June 2019 G-4 <br />