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~SeArv1ing Our Clients Since 1980 <br />~v <br />• ~C Engineering <br />A DIVISION OF WESTERN WATER CONSULTANTS, INC. <br />Civil Environmental Mining Water F~esources <br />61 I Skyline Road Laramie. Wyoming 82070 (307) 742-0031 FAX (307) 721-2913 E-mail: infolar@wwcengineering.com <br />July 3Q 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, Streeter Pond, 001 A <br />Dear Mr. Scott: <br />WWC Engineering (W WC) has performed an evaluation of the Streeter 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 Streeter Pond with Section 4.05.9 of the Division of Minerals <br />and Geology regulations. The evaluation was updated to reflect a baseflow of 0.15 cubic feet per <br />second (cfs). <br />This submittal includes the following attachments. <br />1. Reclamation Blocks Streeter Pond, OOIA. This drawing depicts the post-mining <br />topography on which the pond evaluation was based, the Streeter 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 Streeter Pond, OOlA. This drawing depicts the post- <br />mining topography and the SEDCAD 4 watershed dissection. <br />3. Pond Footprints Streeter Pond, OOIA. This drawin~~ shows the locations of post- <br />mining ponds. The post-mining ponds include Ponds :~. B. C. D. E and Pond F <br />\vhich ha\e a combined capacit} of onh 0.~3 ac-ft. Thee are incised ponds that <br />intercept an insignit7cant amount of drainage area in terms of the design Hood <br />calculations (-10.8 acres out of a total drainage area of 1337? acres). <br />O'I'Ii EX I OC-17111 A~.A <br />Ifi-{J Trna A~enur Il1'fl.ca rin~Sircei -ul :Andcr Dri~c, Suim '_: <br />Sheridan.AA'~uminp S_8U1 Gillal..AAunnln_S'_71P C:nper. AAAuming S'GUI <br />Phone OU71 G7'-(17fiI Phunr 13U7i F3'-1880 I'hunc 13U713?3-'_7117 <br />Fa< l 11171671-J'_fi5 Eas 131171 bS'--"i7 Pas 11(171'_3'-118'_8 <br />GmaiC inloshrC m~ecen~inecrimyiom E-mail: inlogn C\cwr: nginceringxoin E-mail: inlbc<pC''~corangineerimtttnn <br />Nncar Blork Ruildin„ <br />7 \\'c,~ (i' Aanua. Suitr -1E <br />Hdcnu. \IomUn;i 59601 <br />Phone llUCl+t3~396_ <br />Fa~14U61 J17-4~ii <br />F.'-mail: in I'nhln CCw\ccenginccrin~.com <br />