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<br />- Wadge Overburden. Well 42, located in the south central part of the <br />permit area, usually does not have enough water in its casing to sample, <br />as was the case this year. Milliequivalent data and the TDS plot from <br />previous samples has been included in Appendix C. -~ <br />- Wadge Coal. Two wells are used to monitor the water quality of this <br />seam. Well 17 is located just west of NPDES 002. It displays an <br />increasing TDS trend. Well 19 is located in the southwest part of the <br />permit area. It displays a decreasing TDS trend. ~ . <br />- Wolf Creek Overburden/Wadge Underburden. Three wells are used to <br />monitor this stratum. Well 7 is located below the Wolf Creek pit. It <br />displays a nearly level TDS trend. .Well 8P1 is located below a <br />reclaimed portion of the Wadge pit in the southwest corner of the permit <br />area. The TDS values for this well has stabilized. Well 11 is located <br />just west of the PeaCOCo Pond, below a reclaimed portion of~ the Wadge - <br />pit. It displays a decreasing TDS trend. <br />- Trout Creek Sandstone. Well 5 is used as the potable water supply for <br />the Seneca II Mine. It displays a stable TDS trend. <br />- Spoils. Three wells monitor the spoils above NPDES 002. Well 25, the <br />upper well, does not display a distinct TDS trend. There was not enough <br />watei in this well to sample since May 1997. Well 26, the middle well, <br />displayed an increasing TDS trend until 1990/1991, but has decreased <br />since then. Well 27, the bottom well, displays an increasing TDS trend. <br />Well 61 is located in the southwest portion of the permit area. It <br />displays a stable TDS trend. Well 62 is located above NPDES 004. It <br />also displays a stable TDS trend. <br />Comparison of Ground Water Quality to Water Use Standards. SCC has <br />compiled a list of ground water standards for agricultural uses (Table <br />5). This list is composed of Colorado Department of Health ground water • <br />standards (CDOH, Reg. 41, March 1999). <br />8 <br />