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Table 6-1-6 <br /> Chemical and Physical Properties of the Inner Interburden Sandstone (Unit 3) <br /> for Phase I and Phase II Samples Collected from the <br /> Nucla East Study Area, Montrose County, Colorado <br /> Parameter Phase I Hole No.1 Phase 11 Hole No.1 <br /> 2 <br /> (Units) 870E 871E 872E 881E 882E 886E Mean SO <br /> pH 7.9 6.7 8.0 7.9 8.8 6.0 7.5 1 .0 <br /> EC, mmhos/cm 1.6 3.0 1.8 -- -- -- 2.1 0.8 <br /> SP, % 28.0 31.8 28.2 -- -- -- 29.3 2.1 <br /> Sand, % 76.0 71.3 66.4 -- -- -- 71.3 4.8 <br /> Silt, % 17.9 22.7 25.8 -- -- -- 22.1 4.0 <br /> Clay, % 6.1 6.0 7.8 -- -- -- 6.6 1.0 <br /> Ca, meq/1 6.1 25.9 3.0 3.7 0.4 -- 7.8 10.3 <br /> Mg, meq/1 5.2 11.1 3.0 4.1 0.3 -- 4.7 4.0 <br /> Na, meq/1 2.6 1.2 10.9 3.5 14.2 -- 6.5 5.7 <br /> SAR 1.1 0.3 6.3 1.8 23.4 -- 6.6 9.7 <br /> ALK, meq/1 3.5 4.2 4.1 -- -- -- 3.9 0.4 <br /> SO4, meq/1 13.0 37.0 13.7 -- -- -- 21.2 13.7 <br /> AP 5.3 7.8 3.8 2.2 5.3 0.9 4.2 2.5 <br /> NP3 12.5 46.5 21.2 22.4 15.8 4.4 20.5 14.3 <br /> ABP3 7.2 38.7 17.4 20.2 10.5 3.5 16.3 12.6 <br /> NO3, ppm 3.0 1.1 3.6 -- -- -- 2.6 1 .3 <br /> NH4, ppm 57.5 35.9 27.1 25.7 26.9 15.9 31.5 14.2 <br /> B, ppm 0.3 0.2 0.3 -- -- -- 0.3 0.1 <br /> Se, ppm <0.02 <0.02 <0.02 -- -- -- <0.02 0.00 <br /> Mo, ppm 0.07 0.12 0.21 -- -- -- 0.13 0.07 <br /> Fe, ppm 9.3 19.2 6.9 -- -- -- 11.8 6.5 <br /> Mn, ppm 0.5 6.9 0.3 -- -- -- 2.6 3.7 <br /> 1 <br /> For drill hole location, see Exhibit 6-7, Geologic Cross Section and Sample Locations <br /> 3 SO - standard deviation. <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 AB and ABP <br /> whenever sulfur fractionation analyses were available. <br /> 6-1-33 Revised 04/11/88 <br />