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III IIIIIIIIIIIIIIII <br />sss <br />Waco ecN <br />December 5, 1985 <br />~~~~~~~ <br />DEC 101985 <br />Colorado Mined Land Reclamation Division <br />AT1N: Ms. Candy Thanpscm <br />1313 Sherman Street <br />423 Centenntial Building <br />Denver, Colorado 80203 <br />~iti1ED LAP.D FiEC~AMATION <br />Colo. Dept. of Natural Resources <br />SUBJECT: Sun Coal Company ImpoiurLnent Certification Amer~nent <br />Dear Candy: <br />Pursuant to your pest I have enclosed an amendment to the impoundment <br />certification report outlining the assumptions and calculations in <br />designing the structures. As you noted, we used a curve number of 70 in <br />the as-built design calculations and rather than justifying the usuage for <br />this runoff factor, we have used a curve number of 75. In addition, to <br />help your review, we have also included the calculations regarding <br />spillway capacities and anticipated flow velocities. <br />If there are additional camoents or questions, please do not hesitate to <br />call. <br />Yours <br /> <br />'M.L. Robinson <br />Hydrologist <br />cc. Mr. Jeffrey Deckler-CkQ,I~ <br />Mr. Bryan Archer-Sun Coal Company <br />243 East 19 Avenue = 300 • Denver, CO 80203.303/860-1396 <br />