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Environmental Consultants, /nc. <br />Apri14, 2002 <br />Mr. Kent A. Gorham <br />Environmental Protection Specialist II <br />Division of Minerals and Geology <br />1313 Sherman Street, Room 215 <br />Denver, CO 80203 <br />RE: Permit No. C-96-084 <br />Technical Revision No. 08 <br />Dear Mr. Gorham: <br />RECEIVED <br />APR ~ c! 2002 <br />Division of Minerals 8 Geology <br />Following are Lorencito Coal Company's (LCC) responses to the Division's Initial Adequacy <br />Review of Technical Revision No. 8 to Permit No. C-96-084. The Division's comments aze <br />stated below as included in your March 21, 2002, letter followed by LCC's response. <br />1. Revised SEDCAD+ for pond 006a and Figure EX 15-9a is adequate. However, the <br />Division did not. receive a current SEDCAD+ design run for the 25-yeaz storm event for <br />pond 006a. Please submit this information consistent with Figure EX 15-9a. <br />RESPONSE: The SEDCAD + design run for the 25-yeaz storm event for Pond 006a is <br />attached. <br />2. Ditch D96, D97, D98, and D99 are not included on the Jeff Canyon Surface Mine -Fill <br />Areas -Ditch Summary. Please correct as necessary. <br />RESPONSE: The attached Ditch Summary has been revised to include Ditches D96, <br />D97, D98, and D99. <br />3. Ditch D76 should extend entirely aoound the "Mined ridge" on Figure EX 15-15. Please <br />correct as necessary. <br />RESPONSE: The attached Figure EX 15-15 has been revised to show Ditch D76 <br />extending entirely around the mined ridge. <br />4. Fill 8 is classified as a valley fill by definition and in Exhibit 13 of the permit. Drainage <br />from above the fill and from the fill must by directed to diversion ditches that can safely <br />pass the 100-year storm event (Rule 4.09.2(7)). Ditches D81 and D82 are not located <br />above the fill but are in fact on the fill itself. Drainage from the area above the annotated <br />plan view contour of the N seam outcrop must be diverted aoound the fill to sediment <br />pond 8. Ditches D81 and <br />5231 Sou[h Quebec Street • Greenwood Village, Colorado SOI 11 <br />Phone (303) 850-0930 • Fax (303) 721-9298 <br />Web Site: www.greystone-consultants.com • E-mail: greystone@greystone-consultants.com <br />