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• Table 6-3 <br />Criteria for Evaluating Overburden, Underhurden, <br />and Regraded Spoil Suitability', <br /> Unsuitable Except With <br />Parameter Suitable Marginally Amelioration <br /> Suitable <br /> <br />pH > 5.53 5.0 - 5.4' < 5.0 <br /> < 8.50 6.6 - 9.05 > 9.0 <br />Salinity Immhos/cml° < 6 9 - 123 > 12 <br />Saturation < 85° > 65 <br />Percentage 1%1 > 25° < 25 <br />Sodium Adsorption° < 1110 12 - 16 > 16" <br />Ratio < 1410 15 - 22 > 22" <br />Particle Size" ~ 1s, st, t,10 c, sc,13 c, sc, sic," <br />(Texture) sil,scl, cl,sicl sic,si,s with 50% c or M-Co s <br />Boron Ippml 0.5-515 < 0.5 > 515 <br />Molybdenum (Ppml18 < 1.0" > 1.018 <br />Selenium (ppm) < 0.1519 > 0.1530 <br />Nitrate Ammonium- 10.50" 50 - 60 > 6033 <br /> Nitrogen IPPmI <br />. Acid-Base Potential < 530 > 5 <br /> Manganese IpPml 1-703' < 1 > 70 <br /> Iron IpPml 5.30036 < 5 > 300 <br /> Zinc IPPmI 1-7030 < 1 > 70 <br /> Copper IPPmI 0.2-3035 < 0.2 > 30 <br /> Nickel (ppm) < 2.033 2 - 20 > 20 <br /> Arsenic IPPmI < 2.038 > 2.0 <br /> Cadmium Ippml < 539 > 5 <br /> Mercury IPPmI < 0.5°0 > 0.5 <br /> Lead Ippml < 1031 10-100 > 10035 <br /> Aluminum (ppm) < 5439 54-170 > 170'0 <br /> Chromium IPPmI < 503 > 5 <br /> Chlorine IPPmI < 30033 > 300 <br /> Fluorine (ppm) < 10°3 > 10 <br />• <br />23 Revised 9/98 <br />