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Table 6-1-10 <br /> Chemical and Physical Properties of Overburden, Interburden and <br /> Underburden for Phase I and Phase II Samples Collected in <br /> the Nucla East Study Area, <br /> Montrose County, Colorado <br /> Parameter Lithologic Un2t1 2 <br /> (Units) 1 2 3 4 6 Mean <br /> pH 7.2 6.7 7.5 6.0 7.5 7.1 <br /> EC, mmhos/cm 3.2 2.9 2.1 4.6 1.5 3.1 <br /> SP, % 36.4 37.8 29.3 32.4 31.0 35.7 <br /> Sand, % 63.1 67.9 71.3 68.0 76.2 64.5 <br /> Silt, % 24.8 22.7 22.1 23.6 17.5 24.3 <br /> Clay, % 12.1 9.4 6.6 8.4 6.3 11 .2 <br /> Ca, meq/1 14.5 7.1 7.8 15.5 5.5 13.2 <br /> Mg, meq/1 17.0 5.9 4.7 16.1 3.0 14.8 <br /> Na, meq/1 8.7 9.2 6.5 13.7 5.1 8.7 <br /> SAR 4.5 12.0 6.6 6.4 2.7 5.4 <br /> ALK, meq/1 3.2 2.7 3.9 < 1.4 3.2 < 3.2 <br /> SO4, meq/1 40.9 38.7 21.2 61.5 14.6 39.5 <br /> AP 13.6 27.5 4.2 32.2 3.3 14.6 <br /> NP3 37.4 9.1 20.5 8.0 21.5 32.1 <br /> ABP3 23.8 -18.4 16.3 -24.2 18.2 17.5 <br /> NO3, ppm 2.9 2.2 2.6 1.5 1.9 2.7 <br /> NH4, ppm 31 .3 46.9 31 .5 50.7 24.3 33.4 <br /> B, ppm 0.6 0.3 0.3 0.5 0.3 0.5 <br /> Se, ppm <0.02 < 0.03 < 0.02 <0.03 <0.02 <0.02 <br /> Mo, ppm <0.07 < 0.09 0.13 0.20 0.09 <0.08 <br /> Fe, ppm 12.4 58.2 11.8 69.5 10.8 18.6 <br /> Mn, ppm 1 .5 2.1 2.6 3.1 0.6 1.7 <br /> Lithologic units are identified in Appendix 6-1 and discussed earlier in the Overburden, <br /> Interburden, and Underburden Characteristics section. <br /> 2 Weighted mean value only includes Lithologic Units 1, 2, 3, and 4 which will all be <br /> disturbed by mining. Mean thickness of Lithologic Units 1, 2, 33 4, and 6 is 55.9, 6.5, <br /> 3 7.1, 2.7, and 9.7 feet, respectively. <br /> AP - acid potential, NP - neutralization potential, ABP - acid-base potential ; Units are <br /> tons of CaCO3 required per acre furrow slice; AP and ABP were calculated predominantly <br /> from total sulfur. Pyritic sulfur values were utilized to calculate AP and ABP whenever <br /> sulfur fractionation analyses were available. <br /> 6-1-38 Revised 04/11/88 <br />