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• <br /> <br />Department of Natural Resources <br />-2- April 26, 1985 <br />Will discharge occur from the operating sediment pond? If so, an <br />NPDES permit is required. Please contact the Colorado De artment of <br />Health. Also, what. is the design and capacity of the var'ous ponds? <br />Submit information as T.o 1.he consl.ructinn of these ponds, '.e., cross <br />sections. <br />Since no water will be released during the operational pe iod, there <br />will be no need for obtaining a NPDES permit. Sume natura occurring <br />run-off water may pass through the pond system during se sonal snow <br />melt. This will be prior to the mine becoming accessibl and oper- <br />ational. It would not be practical or feasible to co struct and <br />maintain structures sufficient to rontain all spring run- ff. These <br />pond systems will, in fact, reduce the risk of pollution into Penn Creek <br />due to abnormal run-off conditions by acting as sediment ca ch ha sins. <br />There arc no drainage creeks or rivers on permit area. <br />• <br />In order to eliminate any adverse environmental impact, the water <br />demands of the system will be monitored and controlled to nsure that <br />no water is released into Penn Creek. The water which is added will <br />be fed through the pipelines from Penn Creek. This make-up water will <br />compensate for loss due to the wetting, washing, and evaporati n of water <br />during the gravity concentration of the ore. <br />The construction of new dams will be in a manner which v <br />stahle and functional structures during the mine operation <br />period. This will ensure that seasonal run-off prior t~ <br />becoming accessible will not compromise the integrity of <br />The toe and initial dike of the dams will he construct <br />boulders and rough 5 inch to 1 ;inch rock which comes off tl <br />This will be overlain with natural conglomerate from the <br />area. This will then be sealed with clays and silts from tl <br />the mill to create an impervious seal for the pond. See F1 <br />a generalized cross-section of the dike construction. If <br />of the dams need to be raised, it will be done in an "upstri <br />to ensure stability. The pond system will consist. of two ~ <br />first will be a pond of a capacity of 200,000 gallons and <br />will hold approximately 1,600,000 gallons depending on the ' <br />each site. <br />ill ensure <br />nd run-off <br />the site <br />the dams. <br />:d of the <br />e scalper. <br />immediate <br />e tails of <br />gure 1 for <br />the height <br />am" method <br />onds. The <br />the second <br />ogistic of <br />Historic dams were constructed of surrounding alluvium and h~ve held in <br />excess of 40 years. ` <br />Where will the temporary tailings piles be located? Wlat is the <br />estimated volume of these piles? <br />• <br />