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<br />Prior to exposure of ground water, a well permit and substitute supply plan will be obtained from the <br />State Engineer. 7Tre plan will provide a detailed acwunt of depletions and replacement sources. <br />A reclaimed gravel pit lake will require augmentation of evaporation depletions. In addition to the <br />Smith and Emmons shazes described above, Cooley owns approximately 700 acre feet per year of <br />water rights in the South Platte Basin which could be used for augmentation. <br />NPDES Permit <br />An application for a NPDES permit will be submitted for this project. Once a permit is obtained, a <br />copy of the permit will forwazded to DMG. <br />Management of Runoff <br />Cooley Gravel intends to manage on-site runoff under the auspices of NPDES stormwater permit <br />conditions included in the NPDES dischazge permit that will be obtained to perform dewatering <br />• during mining. Cooley wilt implement best management practices (BMPs) to prevent storm waters <br />from coming in contact with undesirable materials (fuels, lubricants, etc.) stored on-site to operate <br />and maintain equipment and vehicles. Surface grading of the temporary plant area operations will be <br />performed to control runoff and prevent degradation of surface and ground water quality. Little or no <br />paving will be on-site, so most precipitation will immediately infiltrate to the water table. <br />At the proposed concrete batch plant area, a contained mixer-truck cleanout pit will be constructed <br />that is lined to prevent discharge of cementatious materials to the subsurface. Cleanout materials <br />collec[ed in the pit will be removed approximately on a monthly basis and the material will be <br />reprocessed through the plant. All fuel storage on-site will be in above ground storage tanks sited <br />above anticipated flood elevations and operated in accordance with all Federal, State and local <br />regulations and requirements within a concrete containment azea. No runoff management will be <br />required following reclamation as an open lake. <br />22 <br />f(~A <br />