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~Se~rvJing Our Clients Since 1980 <br />V' V <br />• VV~ Engineering <br />A DIVISION OF WESTERN WATER CONSULTANTS', INC. <br />Civil Environmental Mining Water Flesources <br />61 I Skyline Road Laramie. Wyomin_ 82070 1307) 742-0031 FAY (307) 721-?913 E-mail: infolar@wwceneineering.com <br />JLily ~o, 2002 <br />Mr. Crellin Scott <br />Colowyo Coal Company L.P. <br />X751 State Highway 13 <br />Meeker, CO 81641 <br />RE: Colowyo Impoundment Evaluation, Work Area Pond, 002A <br />Dear Mr. Scott: <br />WWC Engineering (WWC) has performed an evaluation) of the Work Area 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 Work Area Pond with Section 4.05.9 of the Division of <br />Minerals and Geology regulations. <br />This submittal includes the following attachments. <br />Reclamation Blocks Work Area Pond, 002A. This drawing depicts the post-mining <br />topography on which the pond evaluation was based, the Work Area watershed <br />outline and the reclamation blocks by year from \vhich the worst-case drainage <br />scenario was developed. State Highway 13 and Good Spring Creek are also <br />indicated. <br />2. Sedimentation Pond Redesign Work Area Pond, OID2A- This drawing depicts the <br />post-mining topography and the SEDCAD 4 watershed! dissection. <br />3. Pond Footprints Work Area Pond, 002A. There are no post mining ponds in the <br />Work Area Pond watershed. However, there are impoundments that are used durin~~ <br />minim operations (hvo evaporation ponds. a^ aeration pond, a sediment sump and a <br />\vash bay pond). <br />• <br />ISIU T:nal Accnnc In71:a.1 l~ir.l titretl -111:\nlltr Urice. Suilr'_33 <br />ShcrlOan,\\\umin~8]8111 liillrne.\\~umin•~S'iln Ca.pcr.\\lumine 82601 <br />Phone 13071GT_-0761 Phone 13117168'_-1SVU Phone 13071 a73-27117 <br />Fay )3(177 671-J265 F:u 13071 fi8'!-'__57 Fas 13071'_37-0828 <br />F: muiL in lo:hrC'w~cccngineuim, eom E-mail' inlinJl~ u'~~culEincal'ine ~~o1n Email: in(ocsp@~cwcc n~inccrin~som <br />4. Work Area Pond, 002A As-Built. Chis drawing.. provided by Colo\~~o Coal <br />Company. was used to obtain the dimensional infon:.~ation necessary to model the <br />pond in SEDC:~D -I. <br />%)THEK 1,_UC V 7U.CS <br />Pol~cr RI1xk Buildim~ <br />7 \1'csl 6^': h'cnuc. Suim lE <br />Helena. \huxunn ?)601 <br />Phone 1306141}3962 <br />Fas (3061117-1'_ii <br />Email: inrohlnC~wwanginccrine.rnm <br />