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Spoils. <br />One iwell monitors the spoils above NPDES Pond 002. Well 27 displays an <br />increasing TDS trend, however the trend appears to be stabilizing. Well <br />61 is located a half -mile south of the Pecoco Pond. It displays a stable <br />TDS trend. Well 62 is located above NPDES 004 Pond. It displays a <br />decreasing TDS trend. <br />rison of Ground Water Qualitv to Water Use Standards. <br />The PSCM has compiled a list of ground water standards for agricultural <br />uses (Table 5). This list is composed of Colorado Department of Public <br />Health and Environment (CDPHE) ground water standards (CDPHE, Reg. 41, <br />May 2008). <br />Table 6 in Appendix A provides a comparison of ground water quality data <br />collected this year to agricultural standards. The Paradox database <br />generated table does not include the units of concentration (mg/l or <br />ug/1) for each parameter. The units used for each parameter are the same <br />as those listed on the standards table (Table 5) and are the same as <br />those 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 />above the Method Detection Limit (MDL) / the number of exceedances <br />between the MDL and the Practical Quantitation Level (PQL) / censored, <br />that is, the number of sample values below the MDL but the MDL was <br />higher than the standard / the total number of samples. Below is a <br />summary of sta dards that were exceeded. Given in parenthe is is the <br />source and use f each standard. <br />pH (CDPHE, irrigation) <br />Fluoride (CDPHE, irrigation) <br />Iron <br />Manganese (CDPHE, irrigation) <br />Selenium <br /># of Wells / # of Excursions <br />8/15 <br />3/5 <br />1/1 <br />6/11 <br />1/1 <br />Elevited levels of fluoride may be attributed to natural (i.e., not <br />mining related) conditions, since elevated levels for that parameter is <br />8 <br />