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• similar untts in the survey area. This can result in substantial variation from the predicted characteristics <br />for any given unit. When topsoil salvage actually commences in a particular area, tt is not uncommon to <br />find that the qualtty and quantity of soil present are not exady consistent with predictions from the soil <br />survey. Moreover, topsoil depth data obtained from a survey cannot be unequivocably used to predict <br />what can be salvaged wtth large equipment. A small amount of topsoil is lost during brush Gearing <br />before topsoil is pieced up. Large equipment cannot piGc topsoil up at the precise depth that may be <br />desired, nor can undulating horizons be salvaged wtth precision. Therefore, realistically, disturbed areas <br />will receive 12 inches of topsoil for rangeland and 18 inches of topsoil for cropland so long as soil <br />resources are adequate. If it is found that there is not enough soil to meet these criteria, then soil will be <br />replaced to lesser depths using what suttable soil resources are available. Division approval will be <br />obtained prior to retopsoiling these areas. The 12 and 18-inch replacement depths on rangeland and <br />cropland, respect(uly, were considered optimum as reported in a study conducted by Colorado State <br />Universtty (Redente 8 Wanstedt 1988) at Trapper Mine. <br />• <br />• 4251 <br />Pe-~} <br />MFiI~ 1 3 1998 <br />