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b2.O4 APPLICATION FOR PERMIT FOR SURFACE OR UNDERGROUND MINING ACTIVITIES -- MINIMUM <br />REOIIIREMENTS FOR INFORMATION ON ENVIRONMENTAL RESOURCES. <br />u <br />2.04.5 General Description of Hydrology and Geology contd. <br />(1)(a)cont'd. <br />slope portals sites and fills constructed of rock mate- <br />rial extracted from the entries. Refer to the Golder <br />Associates designs and Sections 2.04.6 and 2.04,7 for <br />additional information. <br />(1)(b)-(3) No change. <br />2.04,6 Geology Description <br />(1) No change, <br />(2) A discussion of the geology of the "D" coal seam and <br />underlying strata above the Rollins sandstone member of <br />the Mesa Verde formation is in Section 2.04,6(2) of the <br />existing approved permit. See Map 2-12 for typical <br />substrata cross-sections. <br />Laboratory analyses of overburden, interburden and <br />floor samples from the Orchard Valley Mine are in the <br />Waste Disposal Appendix, Volume 6A of the existing ap- <br />• proved permit. These samples exhibit higher sodium and <br />sodium absorption ratios typical of carbonaceous strata <br />associated with the coal seam. Such carbonaceous mate- <br />rials removed during development of the rock slope en- <br />tries would he disposed in CWI's approved waste dispos- <br />al area or utilized in the center portions of the <br />fills, covered by four feet or more of non-carbonaceous <br />material. <br />A core sample from drill hole RS-1 near the proposed <br />portals sites was also analyzed per Suggested CMLRD pa- <br />rameters (see attached). As the Division has no guide- <br />lines for acceptable chemical levels in overburden, the <br />results of the analyses were compared to Colorado and <br />Wyoming soil suitability criteria. All chemical param- <br />eters, except boron, were within the good and suitable <br />ranges for soil. Though boron levels are higher, plant <br />growth may not be affected, dependent on the availabil- <br />ity of the chemical element to the plant and the inter- <br />action of boron with other chemical elements in the <br />overburden (Harney, Richard, Ph,D „ Horner & Associ- <br />ates, Inc., personal communication, March 24, 1987). <br />Other composite samples of the rock entries' overburden <br />have also been submitted for laboratory analysis. <br />Baseline stratigraphy data would be compiled and sub- <br />• milted to the Division upon completion of the analyses. <br />4 <br />