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• <br />Site Date H2S+HS, mg/1 pH 8H2S H2S concentration, mg/1 <br /> <br />NPDESI6 4-3-02 <0 .20 7. 95 9.0 * <br />NPDESS 4-8-02 0.05 8. 17 5.9 0.0030 A <br />NPDES6 0.07 8. 10 7.5 0.0052 A <br />NPDES6 9-18-02 0.03 8. 25 5.4 0.0016 <br />WSDS 4-8-02 <0.40 8. 39 3.9 <br />" 6-5-02 0.03 8. 24 5.4 0.0016 <br />WSH7 4-8-02 0.13 8. 22 5.4 0.0070 A <br />WSHF1 0.14 8. 30 4.9 0.0007 <br />" 9-18-02 1.0 7. 59 20.0 <br />* = elevated detection limit, did not calculate <br />A = exceedence <br />Only three samples experienced exceedences of the sulfide standard. Any <br />sulfides present in surface water should eventually oxidize to sulfates. <br />SCC is currently appealing to the CDOH to have these standards relaxed. <br />These standards were based on the presence of fish in the lower portions <br />on the creeks. However, the upper portions that Seneca II-W discharges <br />into have no fish present. <br />NPDES Effluent Criteria (Permit No. CO-0000221). No excursions of <br />NPDES effluent criteria occurred this year. <br />Surface Water Summary- Flows from Ponds 005 and 006 were 398 and 1278 <br />of their historic averages. No flow was observed at Pond 009 this year. <br />Peak flows measured at stream sites were generally the lowest observed <br />since 1994. TDS values NPDES sites 005 and 006 are increasing, as are <br />TDS values at all three downstream surface water sites (WSHF1, WSDS, and <br />WSSF3). Discharges are normally suitable for livestock, but sometimes <br />exceed water quality standards for irrigation. <br />• <br />22 <br />