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• dissolved solids (USEPA, irrigation) 10 <br />sulfate (California, irrigation) 16 <br />Review of this table iadieatee that only one CDOH surface water agricultural use <br />etmdarda were exceeded. The mmgmeae atmdard was exceeded at aevm Bites. <br />However, ae noted Draviouely is the ground water diacueaioa, the relatively low <br />CDOH atmdard of O.Z mg/1, aceordiag to the EPA, applies to plmta proven in <br />acidic soils. Ia alkaline voile, as are fovad in the Seneca II-w region, a more <br />aDDropriate (8PA) standard would be 10 mg/1. The maximum mangmeae value <br />observed this year was 1.74 mg/1. It should also be noted that two stream Bites <br />(Sites 7 and 17), upstream of Seneca II-w diechargea, also experienced <br />excaedeneea of the O.Z mg/1 standard. <br />NPDES Effluent Criteria (Permit No. Co-0000221). No NPDES effluent criteria <br />vets exceeded this year. <br /> Surface water Summary. Flows from Portda 005 and 006 ware the lowest since 1996 <br />• aafl 1994. No flow wee observed at Pond 009 this year. Peak flows measured at <br /> stream vitae ware generally the lowest observed since 1994. TDS values NPD83 <br /> sites 005 and 006 are increasing. However, TDS values at all three downstream <br /> eur£nca water vitae (w3HF1, wSDS, sad wSSF3) display level or decreasing trends. <br /> niechargee er a normally ruitable for livestock, but sometimes exceed water <br /> quality eteadarde for irrigation. <br />RefereACee <br />Amaricm Public Health Aaeoc iatioa (Ed.). 1985. •Steadard Methods for the <br />Examination of water and wastewater", 16th Edition, wsshingtoa, D.C. <br />Brakeaeieh and others. 1979. "Field Manual for Research in Agriculturnl <br />Hydrology". <br />Buchanan and 6umers. 1968. ^Stage Meaeuremeats at ~agiag Stations". <br />Colorado Dept. of Health. March 1999. "Aegulntioa No. 31, The Basic Stmdarde <br />• and Methodologies for Surface water" <br />19 <br />