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• Parameter <br />Manganese (CDOH irrigation) <br />Potentially Dissolved <br />Manganese (CDOH irrigation) <br />Total <br />Nickel (CDOH irrigation) <br />L J <br /># of Sites / # of Excursions <br />13/19 <br />11/14 <br />1/1 <br />This summary indicates that only two CDOH surface water agricultural use <br />standard was exceeded. The manganese standard was exceeded at eleven <br />sites (total) or thirteen sites (potentially dissolved). SCC changed <br />the analytical type from total to potentially dissolved in the middle of <br />2006 (per TR-38). However, as indicated in the recently revised CDOH <br />Regulation 31, the standard of 0.2 mg/1, applies to plants grown in <br />acidic (<6.0 pH) soils. In alkaline soils, as are found in the Seneca <br />II region, a more appropriate (EPA) standard would be 10 mg/1. The <br />maximum manganese value observed this year at any NPDES outfall was 0.76 <br />mg/1 at NPDES 003. A11 stream sites had manganese values less than 0.50 <br />mg/1. It should also be noted that the site on Grassy Creek (SSG2j that <br />is upstream of Seneca II discharges also experienced exceedences of the <br />0.2 mg/1, standard. - <br />Spoil Spring 6 exceeded the nickel standard for irrigation (200 ug/1) <br />with a value of 240 ug/1. However, this water is not used for <br />irrigation. The National Academy of Science suggests a livestock <br />standard of 1000 ug/1 for nickel. This spring eventually flows into <br />Pond 002, which did not exceed the nickel standard. <br />Table 11 shows the CDOH receiving stream standards for Fish Creek (Yampa <br />Segment 13b). Table 12 provides a comparison of those standards to <br />water quality data collected this year from NPDES and stream sites in <br />the Fish Creek basin. Standards that were exceeded are: <br />Iron <br />. Nitrite <br />Sulfide <br /># of Sites <br />3/5 <br />3/3 <br />5/6 <br />21 <br /># of Excursions <br />