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common to each, Along Fish Creek, discharges from Bond and Cow Camp Creeks have not <br />appreciably decreased downstream water quality with respect to the stream standards. <br />The OSMRE also compiled a listing of the most stringent standards for irrigation eater <br />recommended by a variety of organizations (EPA, Wyoming DEO, etc.-OSMRE, 1989). These <br />standards are compiled and presented in Table 24 (Appendix A). These standards for <br />irrigation were compared against Seneca II surface water quality data collected during the <br />1990 water year, and the comparison results are presented in Table 25. Sulfate <br />concentrations at all sites were analyzed at higher levels than the recommended irrigation <br />standard, and higher-than-standard Ieve is of manganese, TDS, and pH were observed at most <br />sites during the 199(1 water year- Again, measured discharges in May, 199D at Cow Camp <br />Creek (Site 10) and Bond Creek CSite 12), and higher-than•standard levels of su Lf ate <br />measured at both sites (TDS also at Site 10) had no appreciable affect on downstream eater <br />quality along Fish Creek at Site 13 (see Appendix E). However, based on the comparison of <br />measured surface water quality and irrigation standards, all surface water in both the <br />Grassy Creek and Fish Creek Basins are chemically unsuitable for irrigation purposes. <br />Table 26 (Appendix A) presents the most stringent livestock standards as compiled from <br />various organizations by the OSMRE (OSMRE, 1989). Surface water quality measured at <br />stream and NPDES sites during [he 1990 water year were compared with the livestock <br />standards, and the comparison results are presented in Table 27 (Appendix A). Only pH was <br />measured at higher levels than the livestock standards, ranging from 8.53 et NPDES 003 and <br />008 to 8.95 at Site 5 (SN-52-5). Other than pH, surface water measured at ell sites <br />associated with the Seneca II Mine was chemically suitable for livestock drinking water <br />during the 7990 water year. <br />(later quality analyses results from samples collected at springs associated with the <br />Seneca I1 Mine during the 1990 water year were compared with livestock drinking water <br />standards (OSMRE, 1989), and only one pH measurement conducted et Spoil Spring 6 was <br />outside of the livestock standard range; pH = 6.20, May 10, 1990. with the exception of <br />this one pH measurement, eater quality sampling at spring sites in 1990 indicate that <br />spring eater quality is chemically suitable for livestock drinking at the Seneca lI Mine, <br />As a final note, no exc eedence of NPDES effluent criteria (Permit No. CO-0000221) was <br />observed at outfalls associated with the Seneca II Mine during the 7990 eater year. <br /> <br />22 <br />