Laserfiche WebLink
finally an increase since 1991. The reason £or this TDS "dip" is unknown. Well 69, <br />located below 46, interestingly displays a decreasing TDS plot. <br />well 68, completed in the Bond Creek alluvium (below NPDES 008), was drilled along with <br />Well 69 (see above) in 1988. It likewise displays a decreasing TDS plot recently. <br />- Wedge Overburden. Well 42, located in the south central part of the permit area, <br />usually does not have enough water in its casing to sample, as was the case this year. <br />Milliequivalent data from previous samples has been included in Appendix C. <br />- Wedge Coal. Two wells are used to monitor the water quality of this seam. Well 37 is <br />located just west of NPDES 002. It displays an increasing TDS trend. Well 19 ie located <br />in the southwest part of the permit area. It displays a decreasing TDS trend. <br />- Wolf Creek Overburden/Wedge Underburden. Three wells are used to monitor this stratum. <br />Well 7 is located below the Wolf Creek pit. It displays an increasing TDS trend. Well <br />BP1 is located below a reclaimed portion of the Wedge pit in the southwest corner of the <br />• permit area. The TDS trend for this well has stabilized. Well 11 is located just west of <br />the PeaCOCO Pond, below a reclaimed portion of the Wadgs pit. It displays a decreasing <br />TDS trend. <br />- Trout Creek Sandstone. Well 5 is used as the potable water supply for the Seneca II <br />Mine. It displays a stable TDS trend. <br />- Spoils. Three wells monitor the spoils above NPDES 002. Well 25, the upper well, does <br />not display a distinct TDS trend. There was not enough water in this well to sample this <br />year. Well 26, the middle wall, displayed an increasing TDS trend until 1990/1991, but <br />has recently decreased. Well 27, the bottom well, displays an increasing TDS trend. <br />Well 61 Is located in the southwest portion of the permit azea. It da splays an increasing <br />TDS trend. Well 62 is located above NPDES 004. It displays an increasing TDS trend. <br />Comparison of Ground Water Quality to Water Use Standards. SCC has compiled a list of <br />ground water use standards for agricultural uses (Table 5). This list is composed mostly <br />. of Colorado Department of Health (CDOH) ground water standards as of March 1999, although <br />other agency standards have been used if the CDOH has no agricultural standard For a <br /> <br />