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• <br />• <br /> <br />Table 17-9 <br />pH <br />4.5-5 <br />5-6 <br />6-7 <br />7-8 <br />8-9 <br />9-10 <br />10-10.5 <br />Classification of pH'of Water Samples from the <br />Nucla East Area, on the Basis of Stratigraphy <br />Overburden 8 <br />Interburden* Coal* Underburden* <br />8 <br />3 <br />4 <br />5 <br />1 8 <br /> 8 <br />2 1 <br />1 1 <br />2 <br />Total* <br />4 <br />5 <br />17 <br />11 <br />3 <br />2 <br />2 <br />44 <br />*Numbers represent the number of samples in the indicated category <br />17-43 <br />Revised 04/11/88 <br />