2012-04-27_REPORT - C2009087 (2)

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- Spoil Springs 6 and 10. These springs exist in the Wolf Creek coal spoils. Spoil Spring 6 exists along the northwest edge of the Wolf Creek pit and exhibits a stable TDS trend. Spoil Spring 6A monitors the same drainage downstream where it meets the haul road. Flow here is considerable higher (112 vs. 1.25 gpm); while TDS values are lower (1170 vs..2520 mg /1). Monitoring at 6A is not a PSCM requirement. Spoil Spring 10 was discovered in 1993. It exists along the southwest edge of the spoils in the vicinity of the Wolf Creek pit underdrain, and is normally sampled at the haul road culvert. It displays a slightly increasing TDS trend. Comparison of Surface Water Quality to Water Use Standards PSCM has compiled a list of surface water standards for agricultural uses (Table 10) . This list is composed of CDPHE surface water agricultural use standards (CDPHE, Reg.31, November 2009). Table 11 provides a comparison of all surface water quality data (including spoil springs) this year to agricultural standards. This 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 also 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 indicate between livestock and irrigation uses in their surface water agricultural standards, they have done so in their similar ground water agricultural standards (see Table 5) . For the sake of discussion, SCC chooses to use those ground water use standards classifications (livestock or irrigation) for surface water use evaluation. ku-M.