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• Spoil Spring M9. This spring is located in the area immediately upstream of the 008 pond. The main source of this spring was located this yeas. Until this year, it exhibited an increasing EC trend. Comparison of Surface Water Quality to Water Vse Standardsv. Irrigation (Table 5) anQ livestock (Table 6) standards were described in the preceding ground eater section. These standards vere compared with key surface eater discharges: all NPDES sites, lover Grassy Creek (SSG2), and Spoil Spring ()1 (SSSPGS). No sites exceeded any livestock standards. Table 11 provides a cauq.+arison of surface water quality to irrigation standards. Standards that vere exceeded are manganese at five sites, dissolved solids at six sites, sulfates at six sites, and chlorides at two sites. Water discharged from the Seneca II Nine is not used directly for irrigation. Indirectly, although, water discharged from the mine is significantly diluted by eater from either Fish Creek or the Yavgra River before it Ss diverted and used for irrigation. Due to tRe relative amount of dilution by additional water from both sources, the ambient eater qualities of Fish Creek and the Yampa Rives are the dominant factors in determining their . suitability for irrigation. Water discharged from the Seneca II Nine is, however, used for livestock watering. One exeeedenee of NPDES effluent criteria (Dermit No. CO-0000221) occurred this year. At NPDES 003, a total suspended solids (T99) value of 52 mq/1 vas obsernd on Narch 21. This value did not exceed the dally maximum standard (70 mg/1), but since it vas the only sample of the month, the monthly average standard (35 mg/1) vas exceeded. This excursion vas a precipitation related event. A letter of notification to the CDOH is provided with its associated DMR in Appendix 6. It should be noted that on the name date, Grassy Creek below NPDES 003 (Site 9562) had a TSS of only 10 mq/1. Surface Water Summary. Due to a high spring runoff, all stream sites and NPDES sites experienced higher than normal flows. TD8 values at NPDES 004 and 008 are increasing at a moderate rate while TDS values at NPDEB 002 and 003 are increasing slightly. Discharges are suitable for livestock, bet marginally suitable for irrigation. Aeferenees • American Public Health A99ociation (Ed.). 1985. "Standard Methods for the Examination of Water and Wastewater", 16th Edition, Washington, D.C. 15