Laserfiche WebLink
~Servl~ng Our Clients Since 1980 <br />V~ <br />~C Engineering <br />• A DIVISION OF WESTERN WATER CONSULTANTS, INC. <br />Civil Environmental Mining Water Flesources <br />61 I Skyline Roarl Laramie. Wyoming 82070 (307) 7d2-0031 FAX (307) 721-::913 E-mail: info]ar@wwcengineering.com <br />July 30; 2002 <br />Mr. Cre]]in Scott <br />Colowyo Coal Company L.P. <br />5751 State Highway 13 <br />Meeker, CO 81641 <br />RE: Colovvyo Impoundment Evaluation, Gulch A Pond, 004A <br />Dear Mr. Scott: <br />WWC Engineering (WWC) has performed an evaluation of the Gulch A 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 colnpliance of the Gulch A Pond with Section 4.05.9 of the Division of Minerals <br />and Geology regulations. <br />This submittal includes the following attachments. <br />1. Reclamation Blocks Gulch A Pond, 004A. This drawing depicts the post-mining <br />topography on which the pond evaluation was based, the Gulch A 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 Gulch A Pond, 004A. This drawing depicts the <br />post-mining topography and the SEDCAD 4 watershed dissection. <br />3. Pond Footprints Gulch A Pond, 004A. This drawing shows the locations of post- <br />minim? ponds. The post-mining ponds include Pond L and Pond M which have a <br />combined capacity of onh O.li ac-ft. Thee are incised ponds that intercept an <br />insignificant amount of drainage area in terms of the design flood calculations (24.4 <br />acres out of a total drainage area of 718. ] acres). <br />• 4. Gulch .A Pond, 004A As-Built. This dra\~ine. prop ided b~ Colo\~~ o Coal Compam. <br />was used to obtain the dinly!td49Ra~)[ip_fRhli?tttion necessar} to model the pond in <br />- --- -------- ------ <br />S~.D~~D~ Putter ftluck Ruildine <br />1119 Tcna Atennc 1071':x1 Pinl Slrcrl 7111:\ndel'Drive. iuile ':? 7\Ce.16'"Acenua. Suilt lE <br />ShciiJan. A1'nmling S3S111 Gilleuc VAA omil'~e A_71h C:~~pcr. AAA omine S'_GUI Helene. Alnnlana J96Ul <br />Phone 1307167}U76f Phnnc i}Oi1l,3'_-19SI1 Phone 1 307 1 1 7 3-'_7117 Phnne llUG1113-196'_ <br />Pa~1 1117 1 671-1'_6i Fa. 1?07t n,1'"_-'_'_>7 Fait?flit??7-US'_8 Fn~0061117-1]ii <br />E-(nail: inlbshrC~wwcxn~interine.rum h-mail: ittluglt F~oo. rengineerine.cum F-mail: inlue+pC'tetreengineering.com Email: inlohln@tetecen_ineerim_.tom <br />