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• Three samples experienced exceedances of the sulfide standard (0.002 <br /> mg/1 un-ionized) this year. The analytical method available to SCC <br /> detects both dissolved sulfides and acid-soluble metallic s ulfides <br /> present in suspended matter. It is suspected th at a large portion of the <br /> sulfides detected is of the latter type, which would bias the un- ionized <br /> results high. Any dissolved sulfi des present in surface water should <br /> eventually oxidize to sulfates. <br />NPDES Effluent Criteria (Permit No. CO-0000221). No excursions of NPDES <br />effluent criteria occurred this year. <br />Surface Water Summary. Flow values from NPDES ponds were below average <br />this year for all ponds except 015. No flow was observed at Pond 009 <br />since 1999. TDS values at NPDES sites 006, 015, 016 and 017 are <br />increasing, as are TDS values at all three downstream surface water <br />sites (WSHF1, WSDS, and WSSF3). The TDS trend is decreasing at NPDES 005 <br />and all four spoil springs. NPDES discharges are normally suitable for <br />• livestock and irrigation, but sometimes exceed water quality standards <br />for aquatic life. All surface water sites, except for lower Sage Creek <br />(WSSF3), had TDS values below the PHC predictions. <br />References <br />American Public Health Association (Ed.). 1985. "Standard Methods for <br />the Examination of Water and Wastewater", 16th Edition, Washington, <br />D.C. <br />Hrakensieh and others. 1979. "Field Manual for Research in Agricultural <br />Hydrology". <br />Buchanan and Somers. 1968. "Stage Measurements at Gaging Stations". <br />Colorado Dept. of Health. August 2005. "Regulation No. 31, The Basic <br />Standards and Methodologies for Surface Water" <br />u <br />23 <br />