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~Se$rv'ing Our Clieaats Sirace 1980 <br />WV <br />W~ Engineering <br />A DIVISION OF WESTERN WATER CONSULTANTS, INC. <br />Civil Environmental Mining Water Resources <br />61 I Skyline Road Laramie. Wyoming 8'_070 (307) 74?-0031 FAX (307) 721-_:913 E-mail: infolar@wwcengineerin~.com <br />July 30, 2002 <br />Mr. Crellin Scott <br />Colowyo Coal Company L.P. <br />X751 State Highway 13 <br />Meeker. CO 8164] <br />RE: Colowyo Impoundment Evaluation, Prospect Pond, 007A <br />Dear Mr. Scott: <br />WWC Engineering (WWC) has performed an evaluation of the Prospect Pond at the <br />request of Colowyo Coal Company. The evaluation was perforred 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 Prospect Pond with Section 4.05.9 of the Division of Minerals <br />and Geology regulations. <br />This submittal inclttdes the following attachments. <br />1. Reclamation Blocks Prospect Pond, 007A. This drawing depicts the post-mining <br />topography on which the pond evaluation was based, the Prospect watershed outline <br />and the reclamation blocks by year from which the worst-case drainage scenario was <br />developed. State Highway li and Good Spring Creek are also indicated. <br />2. Sedimentation Pond Redesign Prospect Pond, 007A. This drawing depicts the <br />post-mining topograph} and the SEDCAD 4 watershed dissection. <br />3. Pond Footprints Prospect Pond, 007A. This drawing shows the locations of post- <br />mining ponds. The post-minine ponds include Pond G. Pond J and Pond h which <br />have a combined capacit} of 1~~7 ac-ft. Thee are incised ponds that intercept an <br />insigniY7cant amount of drainage area in terms of the design flood calculations (33.7 <br />acres out of a total drainage area of 712.E acres). <br />• <br />Vi tII.K LuGt77 U.A.S' <br />IS11Terri avenue lo'. P.:nl l=ir,l Axel llll Tnder Drive-Soil. '_~~ <br />SheriJ:m.\l\'unung J'_Slll Gillette.\\\oining S'71G G1.ptr \\'coming ti'_(UI <br />Phone 131171 67}117(~I Phono 1311E OS'_-ISSU Phone 13117117.1?7117 <br />Pn~1307)67i-1261 ra~11117!b8'_-__"_s7 Ea\13U71-'37-US'_S <br />E-mail: inliuhrC ~~~rcen~inurinesom E-moil: inli~~h@~c~1:em~inaerin.cum E-mail: inlue>p@w~reen~~ineering.<om <br />Hiner 131ue1. Buildine <br />Hzlrna. \lonl:ma ?9GUI <br />Phone H061113-;)G'_ <br />Eac IlU61117-1?i~ <br />E-mail: infohhl@wwcen,incerin o_cOm <br />