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- ~ III IIIIIIIIIIIIIIII <br />STATE OF COLOIZ~DO <br />Roy Rcmer, Governor <br />DEPARTMENT OF NATURAL RESOURCES <br />MINED LAND RECLAMATION DIVISION <br />FRED R. BANTA, Dlr~ator <br />March 17, 1989 <br />Mr. Michael D. Stanton <br />Quaternary Environmental Consulting <br />1210 South Park Drive <br />Monument, Colorado 80132 <br />Re: Rocky Mountain Asphalt, Inc.'s "Summit Pit", File No. M-88-102,` <br />E1 Paso County :. <br />Dear Mr. Stanton: <br />Your P~tarch 14, 1989 response to the Division's February 28, 1989 letter was <br />received by the Division on March 15, 1989, The Division's additional <br />recommendations, supplementing the revised operating and reclamation plans <br />recently provided, follow the format of your letter: <br />4.a. Sediment Pond <br />a. John Doerfer's review of the sediment pond configurations specified <br />that the proposed embankment serving as a weir is not acceptable as a <br />discharge feature. If an embankment structure will be constructed, a spillway <br />designed to pass the 100 yr, storm event is required. Design specifications <br />of such will be required with the as-built designs of the basin. <br />c. The seven (7) foot deep sediment basin should be backfilled to <br />approach the same elevation as the pit floor or adjacent channel grade, and <br />not left as a depression. The cost of filling the volume of the sediment pond <br />has been included in the reclamation costs. <br />d. Baseline sampling as well as post-mining samolina should include <br />both up and downstream as well as above the sediment pond samples for flow <br />rates and Total Suspended Sediments ,TSS, during snoamelt and storm runoff <br />conditions. <br />2? 5 Centennial 9ui;diny, 1313 Sherman S;reef Denver <br />.. <br />Colcrado 8C203-22'3 Tel. (303'. 500.3507 <br />