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- 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 />historically displayed an increasing TDS trend (SF 0.5), although <br />recently it has stabilized. Well 8P1 is located below a reclaimed <br />portion of the Wadge pit in the southwest corner of the old Seneca II <br />permit area. The TDS values for this well have stabilized. Well 11 is <br />located just west of the Pecoco Pond, below a reclaimed portion of the <br />Wadge pit. It displays a decreasing TDS trend. <br />- Trout Creek Sandstone. Well 5 was used as the potable water supply <br />for the PSCM. Due to a change in land ownership, and following loss of <br />electrical power, a sample was not collected 2009. Peabody Energy has <br />since regained ownership of this property, and was able to sample this <br />well again in 2010. It displays a slightly increasing TDS trend, <br />however, the peak TDS value occurred in 2000. <br />- Spoils. Two wells monitor the spoils above NPDES Pond 002. Well 26, <br />the upper well, displayed an increasing TDS trend until 1990/1991, but <br />have decreased since then. Well 27, the lower well, displays an overall <br />increasing TDS trend, however, TDS values peaked in 1998. <br />Well 61 is located a half mile south of the Pecoco Pond. It displays a <br />decreasing TDS trend. Well 62 is located above NPDES 004 Pond. It <br />recently displays a stable TDS trend (SF 0.5). <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 Public Health and <br />Environment (CDPHE) ground water standards (CDPHE, Reg. 41, May 2008). <br />Table 6 provides a comparison of ground water quality data this year to <br />agricultural standards. This Paradox database generated table does not <br />include the units of concentration (mg/1 or ug/1) for each parameter. <br />The units used for each parameter are the same as those listed on the <br />standards table (Table 5) and are also the same as those used in the <br />water quality reports. The frequency column on Table 6 indicates the <br />6