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ySe~rv]rng Our Clients Since 1980 <br />Vtl <br />• W~ ~:ngineering <br />A O(VISION OF WESTERN WATER CONSULTANTS, INC. <br />Civil Environmental Mining Water Resources <br />61 I Skyline Road Laramie, Wyomin¢ 8?070 (307) 742-0031 FAX (307) 7?I-?913 E-mail: infolar@wwcengineering.com <br />July 30, 2002 <br />Mr. Crellin Scott <br />Colowyo Coal Company L.P. <br />5751 State Highway 13 <br />Meeker, CO 81641 <br />RE: Colowyo Impoundment Evaluation, Rail Loop Pond, 006A <br />Dear Mr. Scott: <br />WWC Engineering (WWC) has performed an evaluation of the Rail Loop 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 Rail Loop Pond with Section 4.05.9 of the Division of <br />Minerals and Geology regulations. <br />This submittal includes the following attachments. <br />1. Reclamation Blocks Rail Loop Pond, 006A. This drawing depicts the post-mining <br />topography on which the pond evaluation was based, the Rail Loop 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 Rail Loop Pond, 006A. This drawin, depicts the <br />post-mining topography and the SEDCAD 4 watershed dissection. <br />3. Pond Footprints Rail Loop Pond, 006A. There are no post mining ponds in the <br />Rai] Loop Pond watershed. <br />4. Rail Loop Pond, OO6A As-Built. This dra\cing. pro\'ided by Colo\\, o Coal <br />Compam, \cas used to obtai^ the dimensional information ^eeessarc to model the <br />. pond in SEDC:\D -4. <br />ISal Terra:A. cone lU%E:nl Finl .ivsl cUl .-Anllcr Drier. Snilc _~i <br />ShcriJ;m. AAbuming F2SI11 GilRuc VA'y, nning S'_716 Cmp:r. R)omi m! !'_6111 <br />Phone IAI7)b7'_-0761 Phan: 1311716\?-I SSn Phunc f3071 J71--'7117 <br />Fat f3071 673-J]65 Fax uU710N'-]'i7 Pay L 071 ]i7-063h <br />E-mail: inl'nshr@wwceneinterin_.cum F.-snail: inlu~th C'lcween ~incerine.eom F-mail: inlixop@wwceneinecrin¢.com <br />N+e cr (31oaA auilJinc <br />7 \\'ea 6'°Acanua. $mte aE <br />Helena. \lonnma 59601 <br />Phunc 1!067 l~ i .+96_' <br />Fay W0611J7-d25i <br />E-mail: inloh6l@wlcttnginctrine.com <br />