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19. Attached to the Division's adequacy review letter is an adequacy response letter for PR-2 from <br />the Colorado Division of Wildlife (CDOW) dated January 6, 2011. In their letter, the CDOW <br />offered comments concerning, among other items, surface water hydrology issues. The CDOW <br />requested that the sediment pond and ditches be lined and that upper diversion runoff be <br />channeled to the sediment pond, rather than channeled directly to receiving streams. Also, the <br />CDOW requested that there not be any filling of ephemeral drainages, such as is being proposed <br />for the air jig bench over culvert C11. The CDOW further advised CAM that the Army Corps of <br />Engineers will need to be involved in the bench fill project. <br />All of the CDOW's requests discussed in their letter are to be considered part of the Division's <br />adequacy review of PR-2. In addition, the Division requests that CAM update the Division on the <br />ongoing issue of the reclassification of the stream segment. <br />20. Please add a discussion to the permit text, or point out where such a discussion is located in the <br />permit, concerning inlet and outlet protection for culvert C 11. <br />21. Because culvert C 11 will be about 600 feet long, does CAM intend to construct access sites in <br />case the culvert gets blocked or construct inlet protection to minimize debris entering the <br />culvert? Please add a discussion to the permit text concerning this issue. <br />22. Please show on an appropriate figure the location of the mine water discharge pipe and <br />discharge point, or indicate where in the permit the information can be found. <br />23. Please provide the updated NPDES permit for the new sediment pond and the mine water <br />discharge point when the permit is obtained. <br />24. Please state in Section 2.04.5 and Section 2.04.7 whether East Salt Creek and Big Salt Wash are <br />perennial, intermittent or ephemeral streams. Also, please state in the permit text whether any <br />of the ephemeral streams within the permit area have drainage areas greater than one square <br />mile. <br />25. Rule 4.05.18 requires that the Division make a finding for disturbances within 100 feet of a <br />perennial stream, an intermittent stream or an ephemeral stream with a drainage area greater <br />than one square mile. First, several disturbed areas are or will be within 100 feet of East Salt <br />Creek. Please provide pertinent information in the permit text that demonstrates compliance <br />with 4.05.18. Second, please provide similar information if any of the ephemeral drainages are <br />greater than one square mile in size. <br />26. Please state in an appropriate permit text section if the sediment pond is a class A, B or C <br />structure, as defined in Technical Release No. 60, "Earth Dams and Reservoirs". <br />27. On page 11 of Appendix N, "Probable Hydrologic Consequences", it is stated in the first <br />paragraph that there are two possible sources of irrigation water that are located between SW-1 <br />and SW-8 which may alter water sampling results. If this is the case, how does CAM propose to <br />show that mining has not had any effect on East Salt Creek? <br />cc: Sandy Brown c:/word2007/mcclane/pr2adegmemoI <br />4