2017-03-29_REPORT - C2009087 - Laserfiche WebLink

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Spoil Spring 10 was discovered in ;1993. It exists along the southwest edge of the spoils near the Wolf Creek pit underdrain, and is normally sampled at the haul road culvert. It displays a slightly increasing TDS trend, with the peak TDS value occurred in May 2006. Comparison of Surface Water Qualityito Water Use Standards. PSCM has compiled a list of surface water standards for agricultural uses (Table 10 in Appendix A). This list is composed of CDPHE surface water agricultural use standards (CDPHE, Reg.31, November 2009). Table 11 in Appendix A provides a comparison of all surface water quality data (including spoil springs) collected this year to agricultural standards. The Paradox database -generated table does not include the units of concentration (mg/l or ug/1) for each parameter. The units used for each parameter are the same as those listed on the standards table (Table 10) and are the same as those used in the water quality reports. The frequency column on Table 11 indicates, in this order: uncensored, that is, the number of exceedances above the Method Detection Limit (MDL) / the number of exceedances between the MDL and the Practical Quantitation Level (PQL) / censored, that is, the number of sample values below the MDL but the MDL was higher than the standard / the total number of samples. Below is a summary of standards that were exceeded. Given in parenthesis is the source and use of each standard. Although the CDPHE does not di i between livestock and irrigation uses in th it surface wader agricultural standards, they ave done so in their simi ar ground water agricultural standards (see T ble 5). For the sake of discussion, PSCM chooses to use those ground water use standards classifications (livestock or irrigation) for surface water use evaluation. Manganese (CDPHE irrigation) Selenium (CDPHE irrigation) 19 # of Sites / # of Excursions 4/6 1/1 1