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- Spoil Spring 9. This spring is located in the area immediately <br />upstream of the 008 pond. It recently exhibits a stable EC trend. <br />Comparison of Surface Water Quality to Water Use Standards. SCC has <br />compiled a list of surface water standards for agricultural uses (Table <br />9). This list is composed of CDOH surface water agricultural use <br />standards (CDOH, Reg.31, October 20011. <br />Table 10 provides a comparison of all surface water quality data this <br />year to agricultural standards. This Paradox database generated table <br />does not include the units of concentration (mgil or ug/1) for each <br />parameter. The units used for each parameter are the same as those <br />listed on the standards table (Table 9) and are also the same as those <br />used in the water quality reports. The frequency column on Table 10 <br />indicates the number of exceedences out of the total number of samples <br />(i.e., 1/2 indicates one exceedence out of two samples). Below is a <br />summary of standards that were exceeded. Given in parenthesis is the <br />source and use of each standard. Although the CDOH does not indicate <br />between livestock and irrigation uses in their surface water <br />agricultural standards, they have done so in their similar ground water <br />agricultural standards (see Table 5). For the sake of discussion, SCC <br />chooses to use those ground water use standards classifications <br />(livestock or irrigation) for surface water use evaluation. <br />Parameter # of Sites / # of Excursions <br />Manganese (CDOH irrigation) 11/21 <br />Nickel (CDOH irrigation) 1/1 <br />Review of this summary indicates that only two CDOH surface water <br />agricultural use standard was exceeded. The manganese standard was <br />exceeded at eleven sites. However, as noted previously in the ground <br />water discussion, the relatively low CDOH standard of 0.2 mg/1, <br />according to the EPA, applies to plants grown in acidic soils. In <br />alkaline soils, as are found in the Seneca II region, a more appropriate <br />(EPA) standard would be 10 mg/1. The maximum manganese value observed <br />this year at any NPDES outfall was 0.90 mg/1 at NPDES 003. All stream <br />20 <br />