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One well is sampled in the Grassy Creek alluvium. Well 70 monitors the <br />alluvium below Seneca II (and the PSCM) and downstream of the confluence <br />with Scotchmans Gulch. Most recently it displays an increasing TDS <br />trend; with the peak TDS value occurring in September 2015. <br />Wadge Overburden. <br />Two wells are used to monitor the water quality in this stratum. Well 42 <br />is in the south-central part of the permit area. Well 42 usually <br />exhibits an insufficient volume of water to sample, however it was <br />sampled in May 2018. Well 42 displays a slightly decreasing TDS <br />concentration trend. <br />Well 2702 displays a slightly decreasing TDS concentration trend. The <br />historic TDS values for Well 2702 are relatively low when compared to <br />what is observed in other aquifers in the area. The TDS concentration <br />obtained in May 2018 compares to the historic low value at the site. <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 displays a slightly decreasing TDS trend. <br />The TDS concentration obtained in May 2018 compares to the historic low <br />value at the site. <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 />7 <br />