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at Levels higher than the standards. One analysis for cadmium from Lennox-Vadge . <br />interburden Yell 521, and an analysis for manganese from wolf Creek overburden Welt S7 <br />were higher than the irrigation standards. During the 1990 water year, samplin4 for water <br />quality in alluvial, spoils, underburden, Vadge Coal, Lennox-Vadge interburden and Nolf <br />Creek overburden wells has resulted in chemical analyses for certain parameters that, <br />based on standards comparisons, render these aquifers chemically unsuitable for <br />irrigation. <br />The Office of Surface Mining Reclamation and Enforcement (OSMRE) compiled a listing of the <br />most stringent standards for livestock drinking eater recommended by a number of <br />organizations (EPA, Wyoming DED, etc. - OSMRE, 1989}. These standards are compiled end <br />presented in Table 13. Analyses results for sampling performed on Seneca Il-Y wells <br />during the 1990 eater year were compared with these standards, and Table 14 presents the <br />comparison results. Table 14 shows that samples from underburden cells S8P1 and S11 were <br />analyzed to have higher levels of fluoride and pH than the livestock standards, end YeIL <br />S11 exhibited higher levels of mercury (dissolved) than the standard. Vadge Coal Yell 519 <br />was analyzed to have higher levels of fluoride, pH, and mercury (dissolved) than the <br />standards. Analyses for mercury (dissolved) performed on samples obtained from Spoil <br />Yells 526 and S27 were higher then the standard, and analyses for dissolved solids (TDS) <br />and sulfate performed on samples obtained from Alluvial Vell S68 also were slightly higher <br />than the standard. Based on the aforementioned comparison, the underburden, Vadge Coal, <br />alluvium, and spoils aquifers ell exhibited chemistry that would render water from these <br />aquifers as unsuitable for Livestock. <br />Finally, water quality analyses performed on samples obtained at the Seneee II production <br />well (GY-SS-TC) during 1990 were compared against both primary and secondary drinking <br />water standards developed for ground water by the CDDH ((DOH, 1986). of all standards <br />compared, only analyses for sulfate (secondary standard, 250 mg/l> were higher then the <br />CDDH standard: 368 mg/l, June 1, 1990; and 799 mg/l, November 13, 1989 {see Appendix D). <br />well GY-SS-7C has historically exhibited higher sulfate concentrations than the secondary <br />drinking water standard for this parameter (see Seneca 11 AHR, 1989). <br />Ground Water Quality Summary. TDS values at Yells 6-A, 69-A, 68-A, 17-Y, 61-S, and 62-5 <br />have increased the past year. These increases may be the result of extended drought <br />end/or increased TDS concentrations in the spoils aquifers. TDS values at Wells 32-A, •I <br />31-A2, 33•A, 19-Y, 7-YCO, BP1-U, 11-U, 5-TC, 26-5, and 27-5 appear to be stable when <br />10 <br />