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,, <br />.~ <br />n. <br />III IIIIIIIIIIIIIIII <br />STATE OF CULVKH1Jv <br />MINED LAND RECLAMATION DIVISION <br />Department of Natural Resources <br />1373 Sherman St., Room 275 <br />Denver, CO 80203 <br />303 666-3567 <br />Fa x: 303 832.6106 <br />March 8, 1991 <br />Mr. James E, Stover <br />J.E. Stover and Associates <br />743 Horizon Ct „ Suite 205 <br />Grand Junction, Colorado 81506 <br />RE: Status of Adequacy Issues, PR-01, Somerset Mining Co „ <br />Somerset Mine, Permit C-81-022 <br />Dear Mr. Stover: <br />pF COCO <br />I.F ~. X90o <br />H~ ~~ 10 <br />~ IBT6 ~ <br />Ray Romer. <br />Governor <br />Fretl R. Banta, <br />Division Director <br />The Division has completed the review of the adequacy answer materials <br />received on March 5, 1991, The status of our concerns are as follows: <br />1.-3. Adequate <br />4. This concern addressed the adequacy of the mine water settling pond <br />design. The submitted plan indicates that the pond is located behind <br />what appears to be a ore-existing berm, with an additional <br />embankment, and with much of the pond proposed as being excavated <br />below the existing ground surface. The pond is an impoundment, and <br />it must comply with Rule 4.05.9, Since the pond will be used to <br />settle sediment, it must also comply with Rule 4.05.6. This does not <br />present any significant problem since the submitted plans do comply <br />with both rules with some very minor exceptions as noted below: <br />a. How will the outlet be sampled, if the outlet is submerged in <br />Sanborn Creek? <br />b. Please provide a commitment to monitor sediment accumulation in <br />the pond. with a maximum sediment ieveT below the primary outlet <br />specified. The plan must include a clean-out scheme. <br />c. Please revise the plan to show that embankment slopes will be <br />constructed in compliance with 4.05.6 8fel. <br />Please be advised that construction must comply with the Drovisions <br />of Rule 4.05.6(8), that as-built certifications are required and that <br />quarterly pond inspections will be required. <br />