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~Se~rv]ing Ottr C[ient.r Since 1980 <br />WW <br />- ;> WC Engineering <br />A DIVISION OF WESTERN 'NATER CONSULTANTS'. INC. <br />Civil Environmental Mining Water Flesources <br />61 I Skyline Road Laramie. Wyoming 82070 f307) 743-0031 FAX (307) 731-2913 E-mail: infolar@ww engineering.com <br />REGEIVE[~ <br />July 30, 2002 <br />Mr. Crellin Scott <br />Colowyo Coal Company L.P. <br />X751 State Highway li <br />Meeker. CO 81641 <br />RE: Colowyc Impoundment Evaluations <br />Dear Mr. Scott: <br />MAY 12 2003 <br />Division of Minerals b Gedo9Y <br />Enclosed are two, two volume sets of ring binders containing the SEDCAD evaluations <br />for the existing structures at the Colowyo Mine. Also included are individually bound reports <br />showing base flow for the Streeter Pond (001 A) and the West Pit Pond (008A). <br />~\' SEDCAD runs were performed for the East Taylor Pond (OIOA) to determine how much <br />the spillway must be widened to pass the Emergency Spillway Freeboard Evaluation. As a result <br />of the SEDCAD evaluation, the spillway must be widened from 20 feet to 40 feet. An updated <br />report for the East Taylor Pond is included in this package. <br />Finally, the cover letters for the reports have been updated to reflect the pond numbers. <br />The letters are included in the package. If you choose, please insert them into the individual <br />reports. If you have any questions or comments, please cal] me at (307)742-0031. <br />Sincerely. <br />~~~~~_~~ <br />d <br />Steve Linse. <br />Colorado P.E. 3009 <br />Project Engineer <br />SL:sb <br />Enclosures <br />cc: Dale Bro\vn. \\/enclosures <br />File: 99-6-I? <br /> <br />IST`1 Tara 4~enur liq L'a4 I'ini SU'rrt 7U1 AmIerDme-Suilc _33 <br />ShcriJamAAAanin_g'$111 Gillaic-AA~.nnur_.l'"Ih Ca~pcr.AA')unting S'filll <br />Phunz i3o71GT_-(17fi1 I''hnn: i?I171 GS'_-18611 Phunc i?1171 a7.1-a7U7 <br />Fa: i 11171 n7J-J?M1i Fay Uu71 fiS_'-']i7 Faz 13U71'±7-US_S <br />inlilshe C-ovralgine~rine.ttnn E-mail' inli~ellC ~cacenpincarinesum F.-mail: inlis>pC~w~ecen einmring.com <br />Pul~cr HIoeA Buildinc <br />7 \\'a.t (i'Arenue. Suilc 1F <br />Helena. \Jnnlana i9GUl <br />Phnne IJOG1 aa3-.90'_ <br />Fnx IJ06) aJ7-J"'i5 <br />E-mail: in(ohln@wwcenginecring.ttnn <br />