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well again in 2010. It displays a slightly increasing TDS trend; <br />however, the peak TDS value occurred in 2000. <br />- Spoils. One well monitors the spoils above NPDES Pond 002. Well 27 <br />displays an overall increasing TDS trend, however, TDS values peaked in <br />1998. Well 61 is located a half mile south of the Pecoco Pond. It <br />displays a decreasing TDS trend. Well 62 is located above NPDES 004 <br />Pond. It recently displays a stable TDS trend. <br />Comparison of Ground Water Quality to Water Use Standards. The PSCM 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 /l 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, in <br />this order: uncensored, that is, the number of exceedances above the <br />Method Detection Limit (MDL) / the number of exceedances between the MDL <br />and the Practical Quantitation Level (PQL) / censored, that is, the <br />number of sample values below the MDL but the MDL was higher than the <br />standard / the total number of samples. Below is a summary of standards <br />that were exceeded. Given in parenthesis is the source and use of each <br />standard. <br />Parameter <br />pH (CDPHE, irrigation) <br />Fluoride (CDPHE, irrigation) <br />Iron (CDPHE, irrigation) <br />Manganese (CDPHE, irrigation) <br />Selenium (CDPHE, irrigation) <br /># of Wells / # of Excursions <br />9/15 <br />3/5 <br />1/1 <br />6/10 <br />2/1 <br />M <br />