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Table 6-1-8 <br /> Chemical and Physical Properties of Underburden <br /> Sandstone (Unit 6) for Phase I Samples Collected from the <br /> Nucla East Study Area, Montrose County, Colorado <br /> 1 <br /> Parameter Phase I Hole No. <br /> 2 <br /> (Units) 870E 871E 872E Mean SO <br /> pH 7.6 7.3 7.6 7.5 0.2 <br /> EC, mmhos/cm 1.7 1.2 1.7 1.5 0.3 <br /> SP, % 25.7 36.7 30.7 31 .0 5.5 <br /> Sand, % 76.0 78.8 73.9 76.2 2.5 <br /> Silt, % 18.7 14.6 19.1 17.5 2.5 <br /> Clay, % 5.3 6.6 7.0 6.3 0.9 <br /> Ca, meq/1 5.2 6.3 4.9 5.5 0.7 <br /> Mg, meq/1 1.8 2.3 4.8 3.0 1 .6 <br /> Na, meq/1 7.5 1.7 6.0 5.1 3.0 <br /> SAR 4.5 0.8 2.8 2.7 1.8 <br /> ALK,�meq/1 3.6 2.5 3.4 3.2 0.6 <br /> SO , meq/1 15.1 13.5 15.1 14.6 0.9 <br /> AP 3.1 2.0 4.7 3.3 1 .4 <br /> NP3 51.0 7.7 5.8 21.5 22.6 <br /> ABP3 47.9 5.7 1.1 18.2 25.8 <br /> NO3, ppm 1 .8 1.6 2.3 1.9 0.4 <br /> NH4, ppm 31.5 18.6 22.9 24.3 6.6 <br /> B, ppm 0.3 0.3 0.3 0.3 0.0 <br /> Se, ppm < 0.02 <0.02 <0.02 <0.02 0.00 <br /> Mo, ppm < 0.06 <0.06 0.16 <0.09 0.06 <br /> Fe, ppm 17.5 5.7 9.3 10.8 6.0 <br /> Mn, ppm 0.7 0.7 0.3 0.6 0.2 <br /> 1 <br /> For drill hole location, see Exhibit 6-7, Geologic Cross Section and Sample Locations <br /> 2 SO - standard deviation. <br /> 3 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 /> 6-1-35 Revised 04/11/88 <br />