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<br />• filled with sediment from the gravel washing process. The current settling pond should ntcct <br />the rc~luiremcnts oC the processing plant for 5 }cars, after which the first of three 6-acre <br />additi~~nal ponds will be constructed. Because phase I will be mined long before the future <br />settling pond area is Cully developed, side slopes will be graded to 2:1 (H:V) and revegetated <br />[o control dust. <br />Haul Ftoad Plan <br />Approximately 1.4 miles of haul roads will be constructed to supply [he processing plant <br />with ran-of-mine material and to allow highway access for product delivery trucks. The 0.4 <br />mile highway access road leading north from the processing plant will be treated with an <br />asphalt emulsion up to the northeast corner of the Conda property, and will be paved Crom that <br />point [o Highway 93. The project will also make use of 1.2 miles of existing gravel-surfaced <br />• Rocky Flats Plant fire road that lies within the permit boundaries. <br />\Vater Usaee <br />Total water requirements for the two scrubbing units and the final product washing <br />total 5.800 gallons per minute. Most of this will be supplied by the return of reclaimed process <br />water i rom the settling and storage ponds, but evaporation losses and retention by [he gravel <br />products will necessitate some replacement. The active settling pond will drain into the fresh <br />water {pond, and both will be lined with compacted clay to minimize seepage. Total water losses <br />from evaporation, retention, and seepage is estimated at seven acre-feet per year. Water Cor <br />the gravel project will be supplied Crom the McKay reservoir south of the Rocky Flats Plant <br />via a 3.3 mile long 6" diameter pipeline. This pump and pipeline system will also supply water <br />to the lightweight aggregate plant, and will be sized to handle both requirements. <br />• <br />4 <br />