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irrigation. No exceedences of NPDES effluent criteria (Permit No. CO-0000221) occurred <br />• this year. <br />References <br />American Public Health Association (Ed.). 1985. "Standard Methods for the Examination of <br />water and Wastewater", 16th Edition, Washington, D.C. <br />Bsakensieh and others. 1979. "Field Manual for Research in Agricultural Hydrology". <br />Buchanan and Sumers. 1968. "Stage Measurements at Gaging Stations". <br />EPA. 1976. "Quality Criteria for Water" <br />Hem, John D. 1989. "Study and Interpretation of the Chemical Characteristics of Natural <br />Water" USGS Water Supply Paper 2254, Thizd Edition <br />l~ <br />u <br />• <br />19 <br />