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Table 6-1-3 <br /> Criteria for Evaluating Overburden, Interburd�n, <br /> Underburden, and Regraded Spoils Suitability , <br /> Nucla East Mine, Montrose County, Colorado <br /> March 1988 <br /> Marginally Unsuitable Except <br /> Parameter Suitable Suitable With Amelioration <br /> pH > 5.52 4.5 - 5.44 <4.5 <br /> < 8.53 8.6 - 9.05 >9.0 <br /> Salinity (mmhos/cm)6 < 8 9 - 127 >12 <br /> Saturation <858 >85 <br /> Percentage (%) >25 <25 <br /> Sodium Adsorption <1110 12 - 18 >1811 <br /> Ratio <1410 15 - 22 >2211 <br /> Exchangeable Sodium <1512 16 - 18 >1813 <br /> Percentage (%) <1812 19 - 22 >2213 <br /> Particle Size14 ls, sl , 1,15 c, sc,15 c, sc, sic,16 <br /> (Texture) sil , SC12 cl sic, si, with 50% c <br /> sicl s M-Co s <br /> Boron (ppm) 0.5-5 17 < 0.5 >5 17 <br /> Molybdenum (ppm)18 <0.519 0.6 - 2.0 >2.0 - 820 <br /> Selenium (ppm) <0.121 0.2 - 0.5 > 0.522 <br /> Nitrate Nitrogen (ppm) 10-5023 50 - 60 > 60 24 <br /> Ammonium Nitrogen (ppm) < 16025 < 10 > 16025 <br /> Acid-Base Potential <526 > 5 <br /> Manganese (ppm) 1-70 27 <1 >70 <br /> Iron (ppm) 5-30028 <5 > 300 <br /> Zinc (ppm) 1-7029 <1 >70 <br /> Copper (ppm) 0.2-30 29 < 0.2 >30 <br /> Nickel (ppm) <2.025 2-20 > 20 <br /> Selenium (ppm) <0.230 0.2-0.5 > 0.531 <br /> 6-1-27 Revised 04/11/88 <br />