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Section 2.04.9 Page 31 December 2021 (RN-02) <br />materials in the B horizon of the Pinon soils, at depths of greater than 6 inches, the Progresso soils <br />at depths of greater than 24 inches, and the Orthents soils at depths of greater than one inch were <br />classified as being classified as being of “poor” quality. Increased coarse fragment content was <br />always found in association with increased calcium carbonate equivalent. <br /> <br />The single most limiting parameter of these soils materials was determined to be their coarse <br />fragment content. According to directions provided by the DRMS, coarse fragment contents in <br />excess of 20 percent are “unsuitable” for use as a single lift material, during the topsoiling removal <br />and respreading. According to the data presented in Table 2.04.9-6, Chemical and Physical <br />Properties of NHN Mine Soils, the Progresso soils often have coarse fragment contents in excess <br />of 20 percent. According to the NRCS Soils Survey Manual, a sample of nearly 300 pounds is <br />typically needed for accurate sieve analysis of coarse fragment content. Logistically, it is <br />impossible to collect such samples, therefore the coarse fragment contents reported in the soils <br />pedon descriptions found in Appendix 2.04.9-1, Soils Pedon Descriptions are the most useful <br />information available. <br /> <br />PRESENT AND POTENTIAL PRODUCTIVITY OF THE SOILS <br />The present and potential productivity of these soils as reported by the NRCS in the Soil Survey <br />of San Miguel Area, Colorado - Parts of Dolores, Montrose and San Miguel Counties is found <br />in permit section 2.04.3, Site Description and Land Use Information. The results of the vegetation <br />monitoring completed in connection with this permitting effort are presented in permit Section <br />2.04.10, Vegetation Information. <br />