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timber. Parameters used in this rating are inherent fertility, onsite erosion, shrink- <br />. swell potential, percent coarse fragments, pH range and slope gradient. These <br />ratings are taken from U.S. Forest Service, Rocky Mt. Region, Guidelines for Making <br />Soil Interpretations. These ratings are general and limitations may vary due to <br />requirements of individual species. Table 2.3-7 shows the rating for limitation <br />(slight, moderate, severe) and limitation of this use. <br />LIVESTOCK GRAZING <br />A rating for the suitability of a soil for use as a site for livestock grazing is <br />reloted to the potential productivity of forage, crops and pasture (as listed in Tables <br />2.3-5 and 2.3-6). Additional parameters necessary for this rating include inherent <br />fertility, onsite erosion, mass movement potential and slope gradient. Table 2.3-7 <br />shows the rating and limitation for this use. <br />2.3.4 METHODOLOGY <br />• 2.3.4.1 Description of Survey Techniques <br />The project included mapping at Level I and II intensities. Areas mapped at the <br />intensity of Level I, include phoses of soil series and varients. This mapping was <br />done at I inch = 400 feet (1:4800) scale on base maps made available through P & <br />M, Exhibit 2.3-I. The minimum delineation is I.0 acres. Level II mapping includes <br />soil series, phases of soil series and complexes or associations with less than IS <br />percent inclusions. The minimum delineation of this scale is 2.5 acres. This mapping <br />was also completed with base maps at I inch = 400 feet when available; and I inch <br />= 1000 feet (1:12000) false color aerial photos or I inch = 2000 feet (1:24000 USGS) <br />topographical maps when base maps were not available. <br />Mapping was conducted in such a way as to refine existing mapping of the Soil <br />Conservation Service (SCS}. Soil Conservation Service (SCS) manuscript mapping and <br />soil descriptions compiled for the unpublished Routt County Soil Survey were used as <br />aids in mapping, map unit descriptions and soil interpretations. <br />Soil pedons were sampled and described in accordance to The standards of the <br />National Cooperative Soil Surveys (U.S. Department of Agriculture, Soil Survey Staff, <br />• 1951; U. 5: Department of Agriculture, Soil Conservation Service, 1975). <br />The standard P & M identification code was used in pedon and sample <br />2.3-153 <br />