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• Spoils. Three wells monitor the spoils above NPDES 002 . Rell 25, the upper well, did not <br /> have enough rater to sample in the fall of 1994, but did so in the spring of 2995. A <br /> distinct TD9 trend cannot be observed. Rell 26, the mi ddle well, displayed. an increasing <br /> TDS trend until 1990/1991, but has recently decreased. Well 27, the bottom yell, displays <br /> an increasing TDS trend. <br />Neil fit is located in the southwest portion of the permit area. It displays an increasing <br />TD9 trend. Rell 62 is located above NPDES 004. It displays an increasing TDS trend. <br />CoaWarison of Ground Rater Quality to Rater Use Standards. SCC has coa~lled lists of <br />standards for irrigation (Table 5) and livestock (Table 6). These lists are composed <br />mostly of Colorado Department of Health (COOS) standards, although other agency standards <br />have been used if they are more stringent or if the mOH has no standard for a particular <br />parameter. gee SCC's Yoast Nine Permit Application, Tables 7-21 and 7-23, for a more <br />detailed explanation of these standards. <br />Table 7 provides a ecmparison of ground eater quality to irrigation standards. Standards <br />• that were exceeded are sulfates at 16 yells, manganese at 12 wells, fluoride at 4 yells, <br />iron at 3 wells, pH and chlorides at 2 wells ea eh, and selenium at 1 well. <br />Table B provides a comparison of ground rater quality livestock standards. Standards that <br />were exceeded are fluorides, pH, dissolved solids, and sulfates at two wells each. <br />Finally, rater quality analyses performed on samples obtained at the Seneca II production <br />well (STCS) during 1995 were compared against both primary and secondary drinking water <br />standards developed for ground rater by the CDOH (CDOH, 1986). sulfates (secondary <br />standard, 250 mg/1) were higher than the CDOH standard: 420 mg/1, November 16, 1994; and <br />440 mq/1, .TVne 15, 1995. Rell HTCS has historically exhibited higher sulfate <br />concentrations than the secondary drinking rater standard for this parameter. Also, the <br />same one sample exceeded the secondary standard for iron (0.3 mg/1) with a value of 0.82 <br />mg/1 on June 15, 1995. However, bottled rater is consumed at Seneca II. <br />Ground Rater Quality Summary. TDS values at nine wells displayed increasing TDS trends. <br />TD9 trends at all other wells were either level or decreasing. Agricultural ground eater <br />• standards for manganese, iron, fluoride, sulfates, chlorides, dissolved solids, and pH <br />were exceeded at certain monitoring wells. <br />7 <br />