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Only five samples were collected for each well. These wells failed due <br />to a landslide that occurred in April 2003. Replacement wells, WWCOV25 <br />and WWCU25, were drilled in September 2004. TDS values at these wells <br />display slightly increasing trends. <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. <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 Health ground water <br />standards (CDPHE, Reg. 41, November 2004). <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/1 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 the number of <br />exceedences out of the total number of samples (i.e., 1/2 indicates one <br />exceedence out of two samples). Below is a summary of standards that <br />were exceeded. Given in parenthesis is the source and use of each <br />standard. <br />Parameter # of wells / # of Excursions <br />Boron (CDPHE, irrigation) 2/2 <br />pH (CDPHE, irrigation) 4/5 <br />Iron (CDPHE, irrigation) 2/4 <br />Manganese (CDPHE, irrigation) 7/12 <br />In addition, both samples (from WOV14, WOV17 and WW14) had a cadmium <br />values that were less than an elevated detection limit (30 ug/1 vs. a <br />normal detection limit of 3 ug/1), which was higher than the CDPHE <br />9 <br />