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Water with this iron concentration will precipitate iron oxides on the leaves when the <br />crop is spray-irrigated, but should not be a problem far flood irrigation (EPA, 1976). <br />Wadge Underburden Wells SP1-U and 11-U and Wadge Coal WeLI 19-w exceeded the irrigation <br />fluoride standard of 2.0 mg/L. The wadge underburden wells also exceeded the irrigation <br />pH standard of 6.5 to 8.5. <br />Finally, water quality analyses performed on samples obtained at the Seneca II production <br />well (GW-SS-TC) during 1991 were compared against both primary and secondary drinking <br />water standards developed for ground Nater by the GDOH (CDOH, 1986)- Of all standards <br />compared, only analyses for sulfate (secondary standard, 250 mg/t) were higher than the <br />CDOH standard: 410 mg/l, November 9, 1990; and 420 mg/l, June 27, 1991 (see Appendix D). <br />Nell GN-SS-TC has historically exhibited higher sulfate concentrations than the secondary <br />drinking eater standard for this parameter. <br />Ground Water uuality Summary- TDS values at Vells 6-A, 32-A, 33-A, 68-A, 19-W, 7-wCO, <br />26-5, 27-5, and 62-5 have increased the past year. _ These increases may 6e the result of <br />lower precipitation totals from prior years (even though this year had near normal <br />precipitation, the effects of four years of below normal precipitation may still be • <br />observed) and/or increased TDS concentrations in the spoils aquifers. <br />LDOH agricultural ground water standards for manganese, iron, fluoride, and pH were <br />exceeded at certain monitoring wells. <br />In the area surrounding Seneca II, ground water is not being pumped for irrigation or <br />livestock watering purposes. The above discussion is provided only to serve as a <br />comparative basis to judge ground water quality. Domestic wells that provide drinking <br />water for local residents are not from aquifers impacted by mining. Mining at Seneca II <br />is no[ believed to be causing the degradation of any monitored aquifer. <br />Surface water Ovl.{? <br />Table 13 (Appendix A) lists pertinent information on all NPDES, stream, and spring <br />monitoring sites at the Seneca II Mine. NPDES Discharge Points 002, 003, 004, and 008 are <br />monitored weekly ,for flow and field parameters (pH, conductivity, and temperature). <br />Monitoring for total suspended solids, total iron, total dissolved solids, oil and grease, . <br />10 <br />