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Substitute Supply Plan for the <br />I_ r. vanct AOQr~Oate O~aratinn <br />loss for the fust year of operation is 5.89 acre-feet (no concrete hatching) and ] 0.51 acre-feet for the <br />second year of the operation (afrer subtracting 93,000 tons used in the production of 60,000 yds' of <br />concrete). <br />T'he production of 60,000 yds' of concrete during the second yeaz will result in a 5.52 acre-foot loss <br />to the river system based on an average of 30 gallons of waterlyd' of concrete, which includes the <br />retainage water (100 percent consumption assumed). <br />The proposed operation will include a wash plant with a diversion requirement of approximately <br />1,200 gallons per minute (gpm). The water used at the wash plant will be supplied by groundwater <br />from one of the open pits and recycled. Return flows from the wash plant will be conveyed back to <br />the pond for reuse. The 4 percent retention loss is considered to be sufficient to account for the <br />minor amount of additional losses that may result from the washing operation. <br />Groundwater from one of the wet pits will also be used for dust control. This water will be sprayed <br />on roads and other distwbed areas. Based on historic use records provided by the operator for their <br />nearby Love Pit operation, the water used for dust control is estimated to be approximately 2.16 <br />acre-feet per year for the fast two years of operation. 77vs water is considered 100 percent <br />constumptive. <br />Historic use records from the Love Pit suggest that the proposed operation will result in losses from <br />concrete truck washing totaling an estimated 1,482,000 gallons the second yeaz. Of this total, a 10 <br />percent consumptive loss is assumed since return flows from the wash azea return to the wet pits <br />and aze available for reuse. Therefore, approximately 0.45 acre-feet of depletion to the river system <br />wil] result from the washing of concrete trucks during the second year. <br />While the proposed operntion will have asphalt production capabilities, there will be no additional <br />operational losses because no water is used in the plant. <br />Aggregate mining activities will impact approximately 3.3 acres of jurisdictional wetlands based on <br />a wetland de]ineation conducted by Mr. Dave Mehan of Brown and Caldwell and as confirmed by <br />881-025.110 Wright Water Engineers, Inc. Page 4 <br />