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6.4.7 EXHIBIT G -Water Information <br />The small areal disturbance and shallow excavation created by this gravel pit will not directly <br />affect surface or ground water systems. <br />The pit is not located within a natural drainage system nor is the pit expected to encounter any <br />underground aquifer. Based on mining experience in and adjacent pit to the north, groundwater <br />exists below the shale layer which underlies the gravel deposit. Depth to groundwater is <br />approximately 35 feet. <br />A berm approximately 3-feet in height with 2.Sh:ly side slopes will be constructed along the <br />exposed gravel outcrop along the west edge of the pit will contain within the pit the runoff of <br />precipitation events. The porous nature of the soils in this area and the gentle slope of the pit <br />development will allow the runoff created by brief periods of spring snow melts and summer rains <br />to infiltrate into the ground surface. Any water impounded in the gravel pit will be released to the <br />stream system within a maximum of 72 hours after impoundment. The release of impounded . <br />water will be through a silt fence installed in the berm, a pipe installed through the berm or by <br />pumping. No additional measures aze proposed to control surface run-off. <br />No sedimentation pond is designed or anticipated. Therefore, the Operator/Applicant has not <br />applied for a National Pollutant Dischazge Elimination System permit from the Water Quality <br />Control Division of the Colorado Department of Health. <br />The annual projected water usage for the project are as follows: <br />Mining (Access Road Dust Suppression) <br />1.47 acre feet <br />The above quantity considers the application of water to the surface of the haul road in the amount <br />of 3,000 gallons per day for 160 days each year. No other water is necessary for the mining or <br />processing functions. The material to be mined is moist so the screening and crushing operation <br />should not produce significant dust. <br />Maverick Sand & Gravel entered into a Water Use Agreement with David and Terri Andrews that <br />will provide adequate water for dust control. A copy of the Water Use Agreement follows this <br />section. <br />12/02 G - 1 <br />