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• Grassy Creek drainage, and use for agriculture, which can further concentrate the dissolved salts in the <br />water. <br />The final water quality standard to be applied to the Grassy Creek alluvium is the Regulation 41 Table 4 <br />standard of 1.25 times the ambient concentration of Total Dissolved Solids (TDS). As can be seen in <br />Table 4, the maximum ambient TDS concentration of 4,030 mg/L occurred in well YGAL15. When <br />multiplied by 1.25, the TDS groundwater standard becomes 5,038 mg/L. The current water quality of <br />monitoring well GW-S70-A is 2,840 mg/L (recent maximum occurring on 10/12/05), which is well <br />below the water quality standard. <br />Twentymile Coal Company Well 008-AU-3 exists in the Fish Creek alluvium less than one mile <br />downstream of the Bond Creek confluence (see Figure 3 provided here and also Seneca II Permit <br />Exhibit 7-1). This well is adjacent to CYCC Site 27 on Exhibit 7-1. This well will serve as the Fish <br />Creek alluvial point of compliance well for Seneca II. Table 5 provides ambient (i.e. pre 1/31/94) data <br />for this well and all other wells in Bond Creek and Cow Camp Creek drainages, along with Reg. 41 <br />domestic and agricultural standards, and the most recent analyses for this well. Ambient values were <br />higher than the Reg. 41 standards for iron, manganese, nitrate, and sulfates. These values are underlined <br />on Table 5 and will serve as the standard for those parameter. For all other parameters, the more <br />stringent of the Reg. 41 domestic or agricultural standards will serve as the standard. Those values are <br />also underlined on Table 5. Review of Table 5 indicates that no parameters exceed the proposed point of <br />compliance standards. <br />The final water quality standard to be applied to the Fish Creek alluvium is the Regulation 41 Table 4 <br />• standard of 1.25 times the ambient concentration of Total Dissolved Solids (TDS). As can be seen in <br />Table 5, the maximum ambient TDS concentration of 5,466 mg/L occurred at Well GW-S68-A. When <br />multiplied by 1.25, the TDS groundwater standard becomes 6,832 mg/L. The two most recent (5/5/08 <br />and 10/16/08) TDS values from Well 008-AU-3 are 630 and 720 mg/L, which are both well below the <br />proposed TDS standard. This well will have the water quality data base name SFAL72. <br />0 <br />TR-47 7-3-3 Revised/09