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Surface Yater Site sY-52Y-FC1. This site is located on Xubberson Gulch downstream of the <br />006 Gulch confluence. It has been monitored since July, 1979. Review of its hydrograph • <br />indicates lower than average snowmel[ runoff. Samples et this site display a <br />MgCeNa-SOLNCOL type water with an average TDS value of 1,133 mg/l in 1994. This value is <br />higher then the 942 mg/l baseline average but falls within the baseline range of 290 to <br />1,632 mg/l. Mater quality data from NPDES 006 indicate that mining has had very little <br />influence on TDS values at Site FG1. <br />NPDES 005. This sediment pond is Located in the north mining area on a tributary to Dry <br />Creek referred to as the 005 Gulch. Construction of this pond was completed in July, 1992 <br />end the first discharge occurred an April 22, 1993. Due to for precipitation, no flow ras <br />observed from this site in 1994. <br />Surface Yater Site SY-S2Y-SGS. This site is located on Dry Creek end is the furthest <br />downstream surface rater site for Seneca II-Y. Monitoring at this site began in March, <br />1983. Review of its hydrograph again shore lower than average runoff. Samples at this <br />site display a MgCsNS-SOLXC03 type rater rich en average TDS value of 1,022 mg/l in 1994. <br />This value ie lower then the baseline average of 1,065 mg/l but falls within the baseline <br />range of 345 to 1,562 mg/l. .• <br />Surface Yater Site SY-52Y-FGS. This site is situated on Sege Creek upstream of the <br />impacts from the Seneca II-Y Nine (end also the proposed Toast Mine). Monitoring at this <br />site commenced in September, 1990. Samples et this site display a CaMg-NC03 type water <br />with an average TDS value of 401 mg/l in 1994. Review of the hydrograph indicates the <br />lowest peek flor 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 <br />discontinued Surface Yater Site SY-S2Y-SG3 (period of record: July, 1979 to May, 1986) <br />rill be used in future AXR's as the baseline data for this NPDES site. <br />Surface Yater Site SV-S2Y-FG4. This site is situated on Sage Creek downstream of the <br />impacts from the Seneca II-Y Mine (and also the proposed Toss[ Mine). Monitoring of th(s <br />site commenced in September, 1990. Samples at this site display a CeMg-XC03504 type water <br />with en sverage TDS value of 638 mg/l in 1994. This value is 59 percent higher than that <br />observed upstream at Site FGS, but since no water from the Seneca II-V Mine has yet to • <br />10 <br />