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90 The 1975 SCS soil map was referenced for this updated shop area survey. Map units were delineated by relating the soils to land- forms and topography, geology, drainage patterns, vegetation, and visible surface features. Map unit names and symbols contained in the SCS legend (1975) and used later by Fly and Associates (1979) in the west pit area (Section 25) were retained and cor- related to shop area soils. The SCS map unit boundary lines were transferred to high quality black and white stereo prints that were flown October 26, 1979. Soil boundaries were refined in an office photo-interpretive study using a mirror stereoscope. The refined map boundaries were also confirmed by inspecting recent 1:400" photos taken September 30, 1980. Lastly, the refined map- ping was transferred to a revised and updated 1:400" topographic base map. SURVEY RESULTS Three map units were identified within the field soil survey area (see Exhibit 9-1) . These are 9904/D2, Persayo clay loam and sandy clay loam, 10 to 20% slopes; 5810/7C-2, Shavano sandy clay loam, 5 to 10% slopes; and DL, Disturbed Lands Complex, undifferentiated slopes. The Shavano and Persayo soils occupy landscape positions similar to those described above. The Disturbed Lands Complex are comprised of landscapes previously disturbed by mining activities. These landscapes may include but are not necessarily limited to un- graded spoil piles, abandoned open pits, parking lots, shop buildings, and roads. The Persayo and Shavano map unit and series descriptions with lab- oratory analysis data are found in the Soil Survey Text, Tab 9. Additional laboratory data determined from surface soil samples collected within the shop area by Seneca Coals, Ltd. and USDA Soil Conservation Service in 1975 is included as Table 9-2C-1. The data confirms the "fair" quality rating assigned to the Shavano soil type according to topsoil suitability guidelines listed in Tab 9.