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54 <br /> 3. INTERPRETATIONS GUIDES TO TOPSOIL QUALITY CHARACTERIZATION <br /> These are taken from several sources. Because natural and <br /> disturbed soil and overburden characteristics vary widely from <br /> place to place and because the several agencies have varying <br /> experiences, conceptions and purposes, the guides are not uniform <br /> in selection and evaluation of criteria for topsoil quality. <br /> The first three guide sheets included here were consulted <br /> in arriving at the classification of the Nucla Mine Lease soils <br /> surveyed in this study. They are, respectively, Table 1 = <br /> Wyoming Department of Environmental Quality; Table 2 = USDA Soil <br /> Conservation Service; and Table 3 = USDI Bureau of Reclamation. <br /> The 4th table is a summary of guidelines from several <br /> services prepared for a study by the Western Regional Technical <br /> Work-Planning Conference of the Cooporative Soil Survey held <br /> at San Diego, California, February 13-17, 1978. <br /> The 5th table is a proposed unified set of guidelines <br /> developed at this conference but not yet officially adopted by <br /> the several agencies. <br />