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to table standards, page 87, found on this website: <br />http: / /www.epa.gov /waterscience /criteria /ammonia /99update.pdf <br />NPDES Effluent Criteria (Permit No. CO-- 0000221). No excursions of NPDES <br />effluent limits occurred this year. <br />Surface Water Summary. Water discharged from the Seneca II Mine is not <br />used directly for irrigation. Indirectly, although, water discharged <br />from the mine is significantly diluted by water from Fish Creek before <br />it is diverted and used for irrigation. Due to the relative amount of <br />dilution by additional water from both sources, the ambient water <br />quality of Fish Creek is the dominant factor in determining their <br />suitability for irrigation. Water discharged from the Seneca II Mine is, <br />however, used for livestock watering. <br />TDS values at NPDES8 are increasing. Spoil Spring 9 also exhibits an <br />increasing TDS trend. NPDES discharges are normally suitable for <br />livestock, irrigation and aquatic life. <br />A 76 mg /1 increase in TDS was predicted by the PHC for Fish Creek in <br />June, while a 50 mg /l increase was observed at Site SSF13. A 74 mg /l <br />increase in TDS was predicted by the PHC for Fish Creek in July, while a <br />40 mg /l increase was observed at Site SSF13. The winter snowpack (as <br />estimated from data at the NDCD's Hayden Station) for this year was <br />below average, and so was the annual average flow at NPDES8. <br />References <br />American Public Health Association (Ed.). 1985. "Standard Methods for <br />the Examination of Water and Wastewater ", 16th Edition, Washington, D.C. <br />Brakensieh and others. 1979. "Field Manual for Research in Agricultural <br />Hydrology ". <br />Buchanan and Sumers. 1968. "Stage Measurements at Gaging Stations ". <br />12 <br />