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Wadge Overburden. <br />Two wells are used to monitor the water quality in this stratum. Well <br />42, located in the south-central part of the permit area, usually does <br />not have enough water in its casing to sample, but did have enough water <br />in May 2017 and displays a slightly decreasing trend. Well 2702 displays <br />a decreasing TDS trend. However, the range of all historic TDS values <br />for well 2702 is relatively low when compared to what is observed in <br />other aquifers in the area. <br />Wadge Coal. <br />One well is used to monitor the water quality of this seam. Well CW2701 <br />was first sampled in 2008 and most recently displays a slightly <br />increasing TDS trend. <br />Trout Creek Sandstone. <br />Well STC5 was previously the potable water supply for the PSCM. Due to a <br />pump failure, the last sample from this well was taken in June 2011. <br />This well was abandoned on October 2, 2012. A new replacement well, <br />CTC87, was drilled near Well STC5 in 2011. As it was the drinking water <br />supply for the PSCM, it was sampled per its CDPHE drinking water permit <br />(CO -254705). It is no longer a public drinking water system and the last <br />sample taken was in September of 2012. It displays a decreasing TDS <br />trend. There are no sampling requirements in the CDRMS permit for this <br />well. <br />Spoils. <br />Two wells are used to monitor the water quality of the Spoils. Well 61 <br />is located a half -mile south of the Pecoco Pond. It displays a stable <br />and slightly increasing TDS trend. Well 62 is located above NPDES 004 <br />Pond. It displays a slightly decreasing TDS trend. <br />Comparison of Ground Water Quality to Water Use Standards. <br />The PSCM has compiled a list of ground water standards for agricultural <br />uses (Table 5). This list is composed of Colorado Department of Public <br />7 <br />