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~Se$rv7ing Our Clients Since 1980 <br />Y~ <br />~C Engineering <br />A ONISION OF WESTERN WATER CONSULTANTS, INC. <br />Civil Environmental Mining Water Flesources <br />61 I Skyline Road Laramie. \~~yoming S_070 (307) 7d2-0031 FAX (307) 721 =1913 E-mail: infolar@wwcengineering.com <br />July 30, 2002 <br />Mr. Crellin Scott <br />Colowyo Coal Company L.P. <br />5751 State Highway L3 <br />Meeker, CO 81641 <br />RE: Colowyo Impoundment Evaluation, West Pit Pond, 008A <br />Dear Mr. Scott: <br />WWC Engineering (WWC) has performed an evaluation of the West Pit Pond at the <br />• request of Colowyo Coal Company. The evaluation was performed following the outline of the <br />Streeter Gulch Pond evaluation submitted to you in March 2002. The objective of this exercise <br />was to evaluate compliance of the West Pit Pond with Section 4.05.9 of the Division of Minerals <br />and Geology regulations. The evaluation was updated to reflect a baseflow of 0.03 cubic feet per <br />second (cfs). <br />This submittal includes the following attachments. <br />~J <br />1. Reclamation Blocks West Pit Pond, 008A. This drawing depicts the post-mining <br />topography on which the pond evaluation was based, the West Pit watershed outline <br />and the reclamation blocks by year from which the worst-case drainage scenario was <br />developed. State Highway 13 and Good Spring Creek are also indicated. <br />2. Sedimentation Pond Redesign West Pit Pond, 003A. This draw in, depicts the <br />post-mining topography and the SEDCAD 4 vvatershecl dissection. <br />3. Pond Footprints West Pit Pond, OO8A. There are no post minine ponds in the West <br />Pit Pond watershed. <br />4. West Pit Pond, 008A As-Built. This drawing. provided by Colow~o Coal Company. <br />was used to obtain the dimensional information necessarc to model the pond in <br />SEDC.\D -l. <br /> <br />IR~9l.rni.-A: <nuc 111~1~:-I I`inl tiutia 7Ul indrr U~icc. Suit. '_?? <br />ShrriJan. 1\\oinine ;l'_SUl Glfcua Pluming :;_"ifi Gi,pec\\\oiniue l'6U1 <br />Phonc 1 :1171 OT_-11761 Phunr 1:OL 6S_-I SSI1 Phony 1±(171;; 7_77117 <br />1=u.\ 11071 67J-~26? F.u I?117168.'.-_'_'iJ f-.Ia 1311', I'_71-U3I8 <br />G-mail: in li>shrC`wvrnneinrerinp.eum Eanail: inli~_h Gnc~c:. m~iueuinc.enm Email: inlne>p C'~c~reenginetring.cum <br />Pu~~rr Block I?uilJim~ <br />Helena..\Ionwna 59fi01 <br />Phonc I~U61 a-1i-~96] <br />1=a\ IJ(161 a37--12ii <br />C-mail: infohln <`~cwccmiiimerin~ com <br />