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• Table 6-2 <br />Parameter, Procedure, and Reference List for Seneca II-W <br />Overburden Core Analysis by Peabody Central Lab <br />Freeburg, Illinois, October 1961 <br />Parameter-Units Procedure-Reference <br />Sample preparation Samples were dried at less than 35°C and <br />crushed to Dass a 10 mesh sieve <br />lexcessive grinding was avoitledl~ <br />Subsampling less than 2 mm fraction USDA (19691, Method 1 . <br />Preparation of saturation extract and saturation USDA (19691. Methods 2, 3a, end 276. <br />percentage determination <br />pH (determination using saturated pastel USDA 119691, Method 21 a. <br />pH (determination using saturation extract) USDA (19691. Methods 3a and 21c. <br />Conductivity of saturation extract in mmhos/bm at 25°C USDA 119691, Method 4a. <br /> <br />Calcium content in the saturation extract in meq/1 USDA (19691. Method 3a and Sandoval <br /> and Power 119781, Method 2. <br />Magnesium content in the saturation extract in meq/I Same as Calcium. <br />Sodium content in the saturation extract in meq/l Same es Calcium. <br />SAR and ESP in % USDA 119691, p. 26. <br />Sulfate content in the saturation extract in meq/1 USDA 119691. Method 3a and Sandoval <br />and Power (19761 Method 7A. <br />Nitrate-Nitrogen in the saturation extract in ppm USDA 119691. Method 3a and ASTM <br />(19801, Method D992-71. <br />Boron content in the saturation extract in ppm USDA 119691, Method 3a and Bower and <br />Wilcox 11965), Method 62.3.6. <br />Fluoride content in the saturation extract in ppm USDA 119691. Method 3a and APHA <br />(19751. P~ 391. <br />C~ <br />19 Revised 9/96 <br />