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WATER 2629 Redwing Rd. Swte 200, Fort Collins, Colorado 80526 <br />~ (303)226-3535 <br />~' W AST E III'll'll'll"II III fax (303) 226-6475 <br />& LAND <br />INC. <br />D CC~GD~IG,~I1~ <br />I~ <br />June 17, 1991 ~ ,~ ~ s~99~ ~'~I rl WWL //063 <br />I~ ~J1 <br />Adrian Brown Consultants, Inc. <br />155 South Madison Street, Suite 302 <br />Denver, Colorado 80209 <br />Attention: Mike Galloway, Hydrogeologist <br />Subject: New Castle Energy Corporation, Temporary Mining Refuse Storage Area <br />Dear Mike, <br />As you requested on June 10, this letter sunmarizes WWL's design of the mine <br />refuse storage facility far New Castle Energy Corporation's Coal Ridge No. 1 Mine <br />1n Garfield County, Colorado. This design has been prepared to meet the <br />requirements of Permit Stipulation No. 20. A figure illustrating this design <br />is attached with this letter. <br />SUMMARY OF AVAILABLE INFORMATION <br />This design is based on permit conditions and site information in the revised <br />permit application to the Colorado Mined Land Reclamation Division. The revised <br />permit application cover letter was dated March 9, 1990, with sections dated <br />August 6, 1990 and May 9, 1991. <br />As documented in the revised permit application, waste rock from the underground <br />mining operations will be disposed of back in the mine at the close of <br />operations. A minor amount of the waste rock will be blended into the coal <br />product stream to maintain desired levels of ash content. During mine operation, <br />the waste rock (or refuse) will be temporarily stored on the surface. This <br />temporary facility is referred to in the permit documentation as the mining <br />refuse storage facility. <br />Design criteria for the refuse storage facility are sunmarized below (from the <br />permit documentation). <br />a. Maximum capacity for 15,000 cubic yards of refuse, consisting of broken <br />and pulverized sandstone and shale. This material is anticipated to be <br />free draining. <br />Consulting Engineers and Scientists <br />