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In the Cow Camp Creek alluvium (belpw NPDES 004 Pond), water quality is <br />measured at one well. Well 69 displays a decreasing TDS trend. <br />Wadge Overburden. <br />Five 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 2014 and displays an increasing trend. Well COV11 was first <br />sampled in May 2011. This well displays a decreasing TDS trend. Wells <br />COV23, COV2633 and COV2702 were first sampled in 2008. Well 23 displays <br />an increasing TDS trend, while Wells 2633 and 2702 display decreasing <br />trends. However, the range of all historic TDS values for wells 23, 2633 <br />and 2702, 554 to 880 mg/l, is relatively low when compared to what is <br />observed in other aquifers in the area. <br />Wadge Coal. <br />Five wells are used to monitor the water quality of this seam. Well 17 <br />is located just west of NPDES Pond 002. It displays an increasing TDS <br />trend; however, the trend appears to be stabilizing. Well 19 is located <br />slightly over a mile upstream of NPDES Pond 002. It displays a slightly <br />decreasing TDS trend. Wells CW23, CW2632 and CW2701 were first sampled <br />in 2008. Wells CW23 and CW2632 display a decreasing TDS tend. Well <br />CW2701 displays a slightly increasing TDS trend. All wells, except Well <br />17, display TDS values between 610 and 970 mg/1. <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 in close proximity to Well STC5 in 2011. As it was <br />the drinking water supply for the PSCM, it was sampled per its CDPHE <br />drinking water permit (CO -254705). It is no longer a public drinking <br />water system and the last sample taken was in September of 2012. It <br />displays a decreasing TIS trend. There are no sampling requirements if n <br />the CDRMS permit for this well. <br />7 <br />