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Table 6-1-4 <br /> Chemical and Physical Properties of Overburden Sandstone and <br /> Shale (Unit 1) for Phase I and Phase II Samples Collected in the <br /> Nucla East Study Area, Montrose County, Colorado <br /> 1 1 <br /> Parameter Phase I Hole No. Phase II Hole No. <br /> 2 <br /> (Units) 870E 871E 872E 881E 882E 886E Mean SO <br /> pH 7.2 7.1 7.7 7.5 7.6 6.3 7.2 0.5 <br /> EC, mmhos/cm 3.9 2.1 3.6 -- -- -- 3.2 1.0 <br /> SP, % 38.6 35.5 35.2 -- -- -- 36.4 1.9 <br /> Sand, % 71.7 50.5 67.1 -- -- -- 63.1 11 .1 <br /> Silt, % 17.5 34.4 22.4 -- -- -- 24.8 8.7 <br /> Clay, % 10.8 15.1 10.5 -- -- -- 12.1 2.6 <br /> Ca, meq/1 19.6 18.9 11 .3 12.4 10.2 -- 14.5 4.4 <br /> Mg, meq/1 25.2 5.2 13.2 22.2 19.3 -- 17.0 8.0 <br /> Na, meq/1 5.2 1.5 17.7 4.2 14.8 -- 8.7 7.1 <br /> SAR 1.2 0.5 8.1 1.2 11.4 -- 4.5 5.0 <br /> ALK, meq/1 3.3 2.7 3.6 -- -- -- 3.2 0.5 <br /> SO4, meq/1 53.9 25.5 43.3 -- -- -- 40.9 14.3 <br /> AP 19.8 2.1 22.8 16.0 19.0 1.9 13.6 9.2 <br /> NP3 39.4 31.2 53.9 35.6 31.3 32.8 37.4 8.7 <br /> ABP3 19.6 29.1 31.1 19.6 12.3 30.9 23.8 7.7 <br /> NO3, ppm 2.3 3.0 3.3 -- -- -- 2.9 0.5 <br /> NH4, ppm 49.9 33.5 43.0 20.2 25.2 16.1 31 .3 13.3 <br /> B, ppm 0.3 0.7 0.7 -- -- -- 0.6 0.2 <br /> Se, ppm < 0.02 < 0.02 < 0.02 -- -- -- <0.02 0.0 <br /> Mo, ppm < 0.07 < 0.08 < 0.07 -- -- -- <0.07 0.01 <br /> Fe, ppm 16.5 13.4 7.3 -- -- -- 12.4 4.7 <br /> Mn, ppm 1 .4 2.0 1.0 -- -- -- 1.5 0.5 <br /> 1 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 AP and ABP whenever <br /> sulfur fractionation analyses were available. <br /> 6-1-31 Revised 04/11/88 <br />