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88 <br /> Table 9-6. Chemical and Physical Properties of Stockpiled <br /> Topsoil at Nucla Mine, Montrose County, Colorado. <br /> Parameter' Inhibitory Stockpile Location Number <br /> Units Concentration 11 12 13 <br /> Sand, % >70 54.7 56.8 55.9 <br /> Silt, o -- 18.2 16.4 24.0 <br /> Clay, % >40 27.1 26.8 20.0 <br /> Soil Texture' s,ls,c,sc,sic scl scl scl <br /> Organic Matter, % -- 1.0 0.7 1.9 <br /> Saturation Percentage <25, >80 44.2 44.2 43.0 <br /> pH [-log(H+) ] <5, >9 7.7 7.7 7.9 <br /> E.C.', mmhos/cm >8 2.0 2.7 0.7 <br /> Sodium, meq/1 -- 1.0 1.1 1.1 <br /> Calcium, meq/1 -- 20.3 29.2 6.2 <br /> Magnesium, meq/1 -- 5.4 9.1 1.3 <br /> sAR5 >12 0.3 0.2 0.6 <br /> Sulfur, o -- 0.04 0.14 0.04 <br /> Acid Potential, s -- 0.13 0.44 0.13 <br /> Base Potential, o -- 7.06 8.08 5.93 <br /> Excess Base, % >15 6.93 7.64 5.80 <br /> Molybdenum, ppm >0.3 <1.0 <1.0 <1.0 <br /> Boron, pgn >8 0.6 0.6 0.5 <br /> Zinc, ppm <br /> >35 1.1 1.2 <1.0 <br /> Selenium, ppm >2.0 <0.01 <0.01 <0.01 <br /> Nickel, ppm >1.0 <0.3 0.4 0.3 <br /> 'Parameter values listed are means of three datum. <br /> 2See Map 2, Exhibit 9-2. <br /> 's-sand; is-loamy sand; scl-sandy clay loam; c-clay; sc-sandy clay; and <br /> and sic-silty clay. <br /> 4E.C. - Electrical Conductivity. <br /> 5SAR - Sodium Adsorption Ratio. <br />