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Mr. Edgar Hunter 4 November 19, 1992 <br />c) Please submit the design of the safety berms prepared by a registered <br />professional engineer for approval by the Division. <br />III. Haul Road Overpass <br />11 Please submit the design of each diversion that will be place to control haul <br />road runoff prepared by a Registered Professional Engineer. The diversions <br />should be sized at a minimum fora 10-year, 24-hour ppt. event. <br />2) If no impoundments are necessary, as is stated, how will the haul road <br />overpass runoff comply with Storm Water Regulations? <br />IV. Leach Pad and Waste Rock Disposal Area <br />1) The operator did not mention placement of leak detection systems for the <br />pad and waste rack disposal area. The Division requests that a leak <br />detection system similar to the one proposed for the ponds be placed on the <br />pad and that it be designed by a Registered Professional Engineer. Spacing <br />of a leak detection system should be proportional to the anticipated volume <br />of outflow. Designs must be submitted to the Division. <br />21 Operator stated that crushed ore and ROM areas will be lined with <br />composite 12 inches of compacted soil. Please provide test results that <br />indicates the soil meets the 1 x 10 a permeability requirements? <br />31 In the Victor Engineering Report it is mentioned that 'fly ash" could be used <br />to mix with the soil to achieve the required permeability. The Division does <br />not allow fly ash unless special designation has been obtained from the <br />Colorado Department of Health. <br />4) Please indicate clearly the extension of the liner both in ore and waste pad <br />areas. That is, would the liner cover from the toe to the top of the heap and <br />cover the entire length of the toe berm? <br />5) Will the material used as a buttress also be lined with the geo-membrane <br />liner? If not, please provide a detailed geochemical analysis of the material <br />so that the Division can determine that any discharge from the material will <br />not have any adverse impact to the hydrologic balance in the event the <br />sediment pond overflows. <br />6) The Operator has agreed during the pre-application meetings held at the <br />Division that an independent engineering firm will be certifying each stage of <br />the heap construction. Please provide a list of engineering firms so that the <br />Division can make its recommendation. <br />4~ <br />