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i <br />1633 Terra Avenue <br />Inter•fTlountaln laboratories, Inc. <br />Sheridan, Wyoming 82801 <br />SENECA COAL CONPANY <br />HAYDEN, COLORADO <br />July 24, 1998 <br />Lab No. location <br />156220 57-98 <br />156221 58-98 <br />156222 59-98 <br />156223 60-98 <br />156224 61-98 <br />156225 62-98 <br />156226 63-98 <br />Depths <br />pH <br />6.7 <br />6.9 <br />6.6 <br />6.6 <br />7,0 <br />6.3 <br />6.9 <br />EC total <br />mmhos/cn Sulfur <br />@ 25°C 8 <br />4.68 0,62 <br />2.83 0.18 <br />3,97 0.65 <br />3.43 0.43 <br />3.15 0.38 <br />5.39 0.81 <br />4.95 0,87 <br />T.S. Neut. T.S. <br />AB Pot, ABP <br />t/10001 t/1000t t/10001 <br />19.4 14.6 -4,76 <br />5.62 16.3 10.6 <br />20,3 11.5 -8.84 <br />13.4 9.45 -3.99 <br />11.9 13.2 1.31 <br />27.2 16.7 -10,5 <br />27.2 14.6 -12,6 <br />Sulfate Pyritic Organic <br />Sulfur Sulfur Sulfur <br />3 t 2 <br />0.25 0.31 0.06 <br />0.23 0.36 0,06 <br />0.14 0,26 0.03 <br />0.20 0.58 0,09 <br />0.11 0,61 0.09 <br />Tel. (307) 672-8945 <br />PyrS <br />AB <br />t/1000t <br />9, 68 <br />11.2 <br />8.12 <br />18.1 <br />19.1 <br />PyrS <br />ABP <br />t/10001 <br />4.92 <br />0,22 <br />1.32 <br />-1.43 <br />-4.45 <br />• <br />Page 1 of 1 <br />Abbreviations used in acid base accounting: T.S.= total Sulfur, AB= Acid Base, ABP= Acid Base Potential, PyrS= Pyritic Sulfur, Pyr+Org= Pyritic Sulfur {Organic Sulfur, <br />Neut. Pot.= Neutralization Potential <br />