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