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• data which was utilized to confirm map unit boundaries and to determine ranges of characteristics for each map unit is listed in Appendix 9-4-2. Laboratory Analyses The results of laboratory analysis of all soil samples collected during the July 1986 soil survey are provided in Table 9-4-5. All analyses were per•forined by Energy Labs, Inc., Billings, hiontana. A detailed discussion of the chemical and physical properties of each map unit is included in the following Topsoil Suitability section. Topsoil Suitabili The following section includes detailed descriptions, discussions of analytical results and topsoil resource estimates for each map unit identified during the R'ucla Mine Scraper Pit soil survey. Each map unit was evaluated by individual sampled horizons for significant physical • and chemical properties presented previously in Tables 9-4-1 and 9-4-2. The range of characteristics for each soil type, based upon all sample sites (see Table 9-4-4 and Appendix 9-4-2), was also evaluated. The volume of topsoil available for reclamation is presented in the Topsoil Balance Plan (Tab 9, Attachment 9-3), the Topsoil Removal and Storage section of the Operations Plan (Tab lc"), and the Topsoil hiaintenance and Replacement section of the Postmining Land Use Plan (Tab 13). Map Unit 1 - Persayo Variant Sandy Loam, 15 to 35 Percent Slopes This map unit is associated with the steeply sloping sideslopes of premine drainages which dissect the study area. Vegetation consists primarily of juniper and low sagebrush. Generall;~, this soil overlies soft interbedded shale and sandstone formations at depths ranging from 2 to 10 inches. The soil represents 20.4 percent of the study area (Table 9-4-3). All chemical and physical data, with the exception of coarse fragment content, are suitable for this map unit (Tables 9-4-2 and 9-4-5). However, this map unit has three significant compounding topsoil 9-4-18 Revised 11/01/86