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- 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 decreasing <br />trend, with the peak occurring in 2007. All values have been below 1400 <br />mg /1. <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. 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 2008). <br />Table 6 provides a comparison of ground water quality to agricultural <br />standards. This Paradox database generated table does not include the <br />units of concentration (mg /l or ug /1) for each parameter. The units used <br />for each parameter are the same as those listed on the standards table <br />(Table 5) and are also the same as those used in the water quality <br />reports. The frequency column on Table 6 indicates, in this order: <br />uncensored, that is, the number of exceedances above the Method <br />Detection Limit (MDL) / the number of exceedances between the MDL and <br />the Practical Quantitation Level (PQL) / censored, that is, the number <br />of sample values below the MDL but the MDL was higher than the standard <br />/ the total number of samples. Below is a summary of standards that were <br />exceeded. Given in parenthesis is the source and use of each standard. <br />Parameter <br />of Wells / of Excursions <br />pH (CDPHE, irrigation) 3/3 <br />Iron (CDPHE, irrigation) 2/2 <br />Manganese (CDPHE, irrigation) 4/4 <br />9 <br />