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September 3, 1993 <br />Ms. Christine Johnston <br />Colorado Division of Minerals and Geology <br />1313 Sherman, Room 215 <br />Denver, CO 80203 <br />Subject: Hydrologic Documentation, Technical Revision 65, Mountain <br />Coal Company, Permit C-80-007 <br />Dear Ms. Johnston, <br />Additional hydrologic documentation is being provided to supplement the material <br />previously submitted for Technical Revision 65. These revised permit application <br />pages modify permit references from six sediment control ponds to five, re-number <br />all of the Pond 6-related drainage structures to Pond 2R, and change pond <br />specifications for Exhibit 51. <br />Please supplement the Phase III Coal Storage Facility technical revision <br />submittal which you have with the following inserts for Exhibit 66: <br />Mine Water Control Plan Narrative <br />Table 43 <br />Table 44 <br />Table 45 <br />Ditch Designs <br />D2-1 <br />D2R-1 <br />D2R-lA <br />D2R-2 <br />Berm D2R-2 <br />D2R-3 <br />D2R-4 <br />D2R-5 <br />D2R-6 <br />D2R-7 <br />Culvert Designs <br />C2R-1 <br />C2R-2 <br />C2R-3 <br />C2R-4 <br />C2R-5 <br />C2R-6 <br />Watershed Designs <br />Watershed 18E <br />The following inserts modify Exhibit 51: <br />Section 6.0, pages 23 - 31 <br />LWP-004 <br />Please do not hesitate to call if you have any questions. <br />Sincerely, <br />Catherine W. Begej <br />Senior Project Manager <br />Greystone <br />5990 Greenwood Plaza Blvd. Suite 250 Englewood, CO 80111 <br />(303)850-0930 Fax (303)721-9298 <br />