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1.4.6 Mapping Unit Descriptions <br />The mapping unit descriptions were developed based on <br />the physiographic setting, inclusion of other soils, and <br />topsoil suitability and depth. For soil complexes, the <br />percentage for each soil or land type was estimated. This <br />percentage was based on the estimated average composition <br />of this unit over the entire study area and may vary somewhat <br />from one location to another. The assumption has been made <br />that soils within a mapping unit may occupy the full range <br />of characteristics for primary and included soil types. <br />Topsoil suitability was determined from field and <br />• laboratory data. Average depth was estimated and represents <br />mean values for suitable topsoil material as determined from <br />hand auger holes, soil pits, and drilling. <br />1.4.7 Existing Disturbance Descriptions, <br />The areas of existing disturbance were evaluated and <br />sampled where deemed necessary. The disturbed pad area was <br />delineated as two areas, while the existing road network <br />and drill sites were broken into convenient segments 3or <br />evaluation. Samples taken from existing disturbed areas were <br />collected and analyzed in a manner consistent with that used <br />for undisturbed areas. <br />. The suitability of each area to be successfully <br />revegetated was determined from field and laboratory data. <br />-10-• <br /> <br />