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25, 1993 so that repairs could be made. Repair of the dewatering line was complete on <br />August 5, 1993. <br />Surface Water Site SW-52W-SGS. This site is located on Dry Creek and is the furthest <br />downstream surface Water site for Seneca II-Y. Monitoring at this site began in March, <br />1983. Review of its hydrogra ph shows the highest peak flow since 1986. Samples at this <br />site display a MgCa-504HC03 type eater With an average TDS value of 917 mg/l in 1993. <br />This value is lower than the baseline average of 1,065 mg/l and falls within the baseline <br />range of 345 to 1,562 mg/l. <br />Surface Water Site SW-52W-FGS. This site is situated on Sage Creek upstream of the <br />impacts from the Seneca II-W Mine (and also the proposed Yoast Mine). Monitoring at this <br />site commenced in September, 1990. Samples at this site display a CaMg-HC03 type water <br />with an average TDS value of 398 mg/l in 1993. Review of the hydrograph indicates the <br />highest peak flow on record occurred this year. <br />NPDES 009. This site is situated on a tributary to Sage Creek and was constructed in <br />October 1991. As of yet, no flow has occurred from this pond. Data from the discontinued <br />Surface Water Site SW-S2W-SG3 (period of record: July, 1979 to May, 1986) will be used in <br />future AHR~s as the baseline data for this NPDES site. <br />Surface Water Site SW-52W-FG4. This site is situated on Sage Lreek downstream of the <br />impacts from the Seneca II-W Mine (and also the proposed Yoast Nine). Monitoring of this <br />site commenced in September, 1990. Samples at this site display a CaMg-HC03SO4 type water <br />with an average TDS value of 597 mg/l in 1993. This value is 50 percent higher than that <br />observed upstream a[ Si[e FGS, but since no water from the Seneca II-W Mine has ye[ to <br />discharge into Sage Creek, this increase in TDS is due to natural conditions. Review of <br />the hydrog ra ph indicates the highest peak flow on record occurred [his year. <br />Springs. Spring 5-45, or the Olson Spring, is not a flowing spring, but a three-foot <br />diameter well placed in the alluvium of Dry Creek. Since a well was drilled on the Olson <br />ranch in September, 1980, this "spring" has not been put to use, although it is <br />water-righted for stock use. Samples at this spring display a MgCa-SO4HC03 type water <br />with a 7D5 average of 1,487 mg/l in 1993. This value is lower than the 1,510 mg/l <br />. baseline average, but falls ui thin the baseline range of 1,294 to 1,688 mg/l. <br />11 <br />