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proposed mining plan on the quality of ground and surface water within and adjacent to the . <br />permit area. The following discussion is divided into five parts. They are as follows; <br />1) overburden characterization; 2) the controls on spoil and dwwng radient water quality; <br />3) water chemistry and flow inferences based on Seneca II monitoring results; 4) potential <br />impacts of replaced spoil on ground water quality; and 5) potential impacts of replaced <br />spoil on surface water quality. <br />Regional and si to-specific hydro geologic data were collected and analyzed to assess the <br />presence of acid-forming or toxic forming materials and their potential effects on ground <br />and surface water. Downgradient and downstream water uses were evaluated to determine the <br />potential effects of underground and surface spoil water discharges on domestic and <br />agricultural water uses in the adjacent areas. Since mining has only recently been <br />conducted in the Seneca II-W area, there are no site-specific spoil water or spoil spring <br />data available for analysis. Analyses of spoil chemistry data obtained at the Seneca II <br />Mine will be heavily relied upon to assist in the impact analyses. Wherever possible, <br />comparisons of overburden chemical data and aquifer data from both mines rvill be utilized <br />to show where similarities exist and to qualify the differences. <br />Overburden Characterization. Fifteen cores and nine cores of Wad ge overburden were • <br />analyzed for chemistry at the Seneca II-W and Seneca II Mines, respectively. Seneca II-W <br />overburden cores analyzed are 30-C, 42-C, 43-C, 99-C, 125-C, 300-C, 311-C, 508-C, 555-C, <br />569-C, 609-C, 1127-E, 1128-E, 1129-E, and 1130-E. The nine Seneca II overburden cores <br />analyzed are 1900-E, 1910-E, 2034-E, 2096-E, 2306-E, 2307-E, 2308-E, 2613-E, and 2614-E. <br />The 15 Seneca II-W cores were analyzed for their acid base potential (ABP). The acid base <br />potential involves a comparison of the acid potential expressed as tons of CaC03 required <br />per 1,000 tons of material for neutralization and the neutralization potential which is <br />the tons of CaC03 excess per 1,000 tons of material. Positive ABP's indicate reactions of <br />the overburden with water should yield pH's greater than 7. Negative ABP's indicate that <br />acidic conditions may develop. Table 17-5 presents an ABP summary for each core. Six of <br />the fifteen cores show some zones with acid potentials. None of the cores show overall <br />acid potentials owing to the large amounts of excess CaC03 in each core. Of the 852 feet <br />of overburden core analyzed at the Seneca II-W Mine, only 23 feet or 2.7 percent showed an <br />acid potential. <br />Paste pH values for the Seneca II-Y7 and Seneca II cores were also analyzed. Tables 17-6a • <br />and b present sunmaries of core paste pH values that were below a pH of 7. At first <br />18 <br />