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52.04 APPLICATION FOR PERMIT FOR SIIRFACE OR UNDERGROUND MINING ACTIVITIES -- <br />MINIMUM REQUIREMENTS FOR INFORMATION ON ENVIRONMENTAL RESOURCES. <br />2.04.6 Geology Description. <br />(2) (a) (Cont'd.) <br />attenuated by nondeposition. Interburden ranges from <br />15 1/2 ft. to several inches. Relatively uniform "D" <br />coal seams underlie Lease dPC-37210, with the exception <br />of the northwest portion of the Permit Area. The upper <br />and lower "D" splits will be exclusively developed from <br />the Orchard Valley Mine, mineability and quality fac- <br />tors influencing which split to be mined. Thickness <br />ranges from 22 ft. to less than 2 ft. The depositional <br />environment of upper "D" time is portrayed on Map 2-1, <br />which also shows the roof lithology [o be expected <br />within the mine workings. For specific information <br />concerning the "D" coal zone,- refer to the Confidential <br />Appendices, Volume 10. <br />Waste rock is encountered from roof falls, cap rock, <br />floor strata, and clastic dikes (rock spars). Typical <br />analysis of waste rock and roof strata are presented in <br />the Waste Disposal Appendix, Volume 6A. Further dis- <br />cussion of the waste rock material is found in Section <br />• 2.04.6(2)(a)(iii)(C). <br />Laboratory analyses of samples obtained from drill <br />holes near the proposed rock slope portals and entries <br />were completed. See Map 2-12 in Volume 2 for typical <br />substrata cross-sections. <br />One sample from a core of Drill Hole RS-1 located <br />northwest of the proposed portals sites was analyzed <br />per suggested CMLRD parameters. As the Division has no <br />guidelines for acceptable chemical levels in overbur- <br />den, the results of the analyses were compared to Colo- <br />rado and Wyoming soil suitability criteria, All chemi- <br />cal parameters, except boron, weze within the good and <br />suitable ranges for soil. Though boron levels are <br />higher, plant growth may not be affected, dependent on <br />the availability of the chemical element to the plant <br />and the interaction of boron with other chemical ele- <br />ments in the overburden (Harner, Richard, Ph.D., Harner <br />b Associates, Inc., personal communication, March 24, <br />1987). <br />Revised 08/01/84 <br />Revised 12/26/84 <br />Revised 07/13/87 <br />Revised 10/01/81 <br />21 <br />