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4.0 RESULTSIDISCUSSION <br />• <br />• <br />~J <br />4.1 Soil Survey Maps <br />The distribution of each soil map unit on the Yoast study area is provided on 1"=400' scale <br />topographic base maps accompanying this report (Exhibit 9-1, sheet 1 of 2 and 2 of 2, <br />respectively). The legend on the maps includes all map unit symbols and names, soil series <br />designations, and recommended soil savage thicknesses for all map units which occur in the <br />projected disturbance area. Map unit delineations, soil observation sites, and typifying soil pedon <br />sample locations for the study area were transferred from the 1"=400' scale black and white <br />aerial photo field base map to the topographic base soil map. Sheet 1 includes the area to be <br />affected by mining, while Sheet 2 primarily includes the proposed haul road north of the <br />proposed mine area. <br />Typifying soil pedons (soil sample locations), as well as all 132 soil observation/profile <br />description sites, are denoted on Exhibit 9-1 as well. A Soil Profile Descriptions List is provided <br />as Table 3. The legend on the maps includes all.map unit symbols and names, soil series <br />designations, and all recommended soil salvage thicknesses for all map units which occur in the <br />projected disturbance area. <br />4.2 Soil Horizon Nomenclature <br />Revised soil series descriptions were available from SCS for all soil series and series variants <br />mapped on the study area. These revised descriptions incorporated the new soil horizon <br />nomenclature. This nomenclature was also used for all profile descriptions completed during the <br />Yoast soil survey. <br />4.3 Soil Series Correlation <br />Correlation ofsite-specific soils with SCS criteria was completed. All soils, except for Ustorthents <br />and Cryoborolls, were associated with established series and correlated readily. A higher <br />taxonomic classification for the Ustorthents-Cryoborolls map unit (map unit 103) was not possible <br />due to highly variable physical properties. One detailed description for each of the two soil great <br />groups (Y25 for Ustorthents, and Y42 for Cryoborolls) was completed and samples were taken <br />and analyzed. One series variant, Zoltay (moderately well drained rather than well drained), was <br />mapped within the study area. Several other soils exhibited variant characteristics at one or <br />more locations during the mapping but were not significant and were not a named component <br />of a map unit. No new soil series were proposed as part of the Yoast survey. <br />17 <br />