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<br />122, 123, 124, 125, 132, 135 and 137 are primarily based on published information <br />fro.n the SCS. 'These units include Piceance, Uffens and Ya,nac soil series which <br />were not observed or described in the potential affected areas covered by this <br />survey. <br />b. FIELD OBSERVATIONS <br />Field observations provided the basis for soils .napping, sa,npling, and description <br />presented in this report. These observations were primarily obtained from numerous <br />spade and core-auger hobs ranging in depth from one to five or morn feat which <br />were dug in each large map unit delineation. In addition, about 15 back-hoe pits <br />were excavated to examine deeper strata, obtain soil samples, and write profile <br />• descriptions. Jther observations included associated parent material, vegetation, <br />and position on landscape. <br />c. ~4APPING <br />Field mapping and verification of soils were done directly on high quality <br />topographic maps and photos of 1 inch 500 feet Scala. High intensity mapping <br />was employed with delineations as small as two acres where necessary. Vegetation, <br />physiography, and numerous Spada and auger holes were used to dater.mine mapping <br />unit boundaries. Constant reference was made to currently available SCS soil <br />series descriptions and ranges of characteristics to maintain a high degree of <br />• <br />II.I-7 <br />