2009-02-26_REPORT - C1980005 (7)

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flow into the Wadge Impoundment via Little Grassy Creek. Spoil Spring 7 existed at the upper end of the Wadge Impoundment until the summer of 2002, when regrading of the pond shoreline buried this spring. A spring reappeared in this area in 2003, and monitoring has resumed. Its EC plot (SF = 0.5) recently displays a decreasing EC trend. - Spoil Springs 6, 6A, 10 and 10A. 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 EC trend. Spoil Spring 6A is sampled at the haul road culvert below Spoil Spring 6. It was sampled for the first time ever this year. Same day samples at both springs indicate an increase in flow (2 to 25 gpm) and a decrease in TDS (2720 to 1300 mg/1) between 6 and 6A. 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 stable E;C trend. Spoil Spring 10A is located 1200 feet above Spoil Spring 10 and is at the toe of the Wolf Creek pit underdrain. It displays an increasing EC trend. Same day samples at both springs indicate a decrease in flow (21 to 16 gpm) and a decrease in TDS (4010 to 3900 mg/1) between 10A and 10. - Spoil Spring 9. This spring is located in the area immediately upstream of the 008 pond. It exhibits a slightly increasing EC trend (SF = 0.5). Comparison of Surface Water Quality to Water Use Standards. SCC has compiled a list of surface water standards for agricultural uses (Table 9). This list is composed of CDPHE surface water agricultural use standards (CDPHE, Reg.31, May 2008). Table 10 provides a comparison of all surface water quality data 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 17