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6.4.7 Exhibit G <br />Water Information <br />Mining is expected to have no impact on the prevailing hydrologic balance. <br />Groundwater will not be exposed; therefore, a Substitute Water Supply Plan will not <br />be necessary. <br />The proposed permit boundary encompasses areas where ephemeral and <br />intermittent creeks converge. The convergence of Hardscrabble Creek and Low <br />Black Creek is within the proposed permit boundary. Mining is limited to the top soil <br />terrace at least 40 feet above the normal high water mark of creek beds. <br />The site will operate under a Colorado Department of Public Health and <br />Environment, Water Quality Control Division stormwater discharge permit. Disturbed <br />areas will maintain a perimeter berm of undisturbed native material to prevent <br />stormwater in contact with mining activities from entering surface water flow. If <br />necessary, discharge outlets will be constructed with straw bales or straw waddles. <br />Surface water will be contained within mining disturbance less than 72 hours. <br />Runoff occurs as overland flow to natural drainage ravines and creek beds in <br />the vicinity. Stormwater best management practices such as waddles, straw bales, <br />and perimeter berms will be placed to effectively manage stormwater. Historic flow <br />will be maintained during mining. <br />Consumptive use of water may occur as dust suppression on the haul road <br />and working face. The operator will purchase the necessary volume of water from <br />an appropriate supplier. The amount required for dust suppression is undetermined <br />at this time. <br />The permittee will complete a stormwater management plan and file a <br />stormwater discharge application with Colorado Department of Public Health and <br />Environment, Water Quality Division. Diversionary berms and impoundments will be <br />constructed as recommended by the Water Quality Division. <br />91 <br />