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- Wolf Creek Coal. Mining of the Wolf Creek coal seam began in October <br />2003. One well monitors the water quality in this coal seam in the II -W <br />South area. Well WWC24 was drilled in August 2001 in the II -W South <br />area. Only five samples were collected until this well failed due to a <br />landslide that occurred in April 2003. A replacement well, WWC25, was <br />drilled in September 2004. TDS values at this well display a recently <br />stable trend, with the peaks occurring in 2008, 2011 and 2015. All <br />values have been below 1500 mg/l. <br />- Wolf Creek Underburden. Well WWCU24 was drilled in August 2001 in the <br />II -W South area. Only five samples were collected until it failed due to <br />a landslide that occurred in April 2003. Replacement well WWCU25 was <br />drilled in September 2004. TDS values at this well display a recently <br />stable trend, with the peak occurring in 2007. All values have been <br />below 1400 mg/l. <br />- Trout Creek Sandstone. Well WTC201 is used as the water supply well <br />for the mine facilities. It displays an increasing TDS trend; however, <br />the peak TDS value occurred in June 1999 and this year's sampling <br />displayed unusually low TDS values. It is unlikely that the TDS <br />increases observed at this well are due to mining impacts, since <br />confining layers of shale separated this aquifer from mined seams. All <br />values have been at or below 700 mg/l. <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 ground water standards (CDPHE, Reg. 41, May 2004). <br />Table 6 provides a comparison of ground water quality collected this <br />year to agricultural standards. This Paradox database -generated table <br />does not include the units of concentration (mg/l or ug/1) for each <br />parameter. The units used for each parameter are the same as those <br />listed on the standards table (Table 5) and are also the same as those <br />used in the water quality reports. The frequency column on Table 6 <br />indicates, in this order: uncensored, that is, the number of exceedances <br />7 <br />