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• consistence; moderately effervescent, neutral (pH 7.2, from lab data); gradual wavy <br />boundary. <br />OB3 horizon (overburden spoil) - 52 to 72 inches; light brownish gray (lOYR 6/2) silty <br />clay loam (27% clay) overburden spoil, dark grayish brown (lOYR 4/2) moist; massive, <br />compacted structure; very hard dry consistence, firm moist consistence; sticky and plastic <br />wet consistence; moderately effervescent, neutral (pH 7.2, from lab data); gradual wavy <br />boundary. <br />4.0 REFERENCES <br />Schoeneberger, P.J. et.al. 2002. Field Book for Describing and Sampling Soils. Version <br />2.0. U.S.D.A.-Natural Resources Conservation Service-National Soil Survey Center. <br />Lincoln, Nebraska. <br />Seneca Coal Company, IIW Mine. 2002. Criteria for Evaluating Overburden, <br />Underburden, and Regraded Spoil Suitability. Table 6-3, Seneca IIW Mine. Revised <br />January 2002. <br />UDOGM. 2003. Guidelines for Management of Topsoil and Overburden. R645-301-200 <br />Soils. State of Utah. Department of Natural Resources, Division of Oil, Gas and Mining <br />(UDOGM).Draft June 2003. <br />• Wyoming Department of Environmental Quality-Land Quality Division (WDEQ). 1996. <br />Guideline No.l, Topsoil and Overburden. Rules Update, August 1994; Selenium Update, <br />November 1996. <br /> <br />9 <br />