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C~ <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, March 1999). <br />Table 10 provides a comparison of surface water quality to agricultural <br />standards. This Paradox database generated table does not include the <br />units of concentration (mg/1 or ug/1) for each parameter. The units used <br />for each parameter are the same as those listed on the standards table <br />(Table 9) and are also the same as those used in the water quality <br />reports. The frequency column on Table 10 indicates the number of <br />exceedences out of the total number of samples (i.e., 1/2 indicates one <br />exceedence out of two samples). Below is a summary of standards that <br />were exceeded. Given in parenthesis is the source and use of each <br />standard. Although the CDOH does not indicate between livestock and <br />irrigation uses in their surface water agricultural standards, they have <br />• done so in their similar ground water agricultural standards (see Table <br />5). For the sake of discussion, SCC chooses to use those ground water <br />use standards classifications (livestock or irrigation) for surface <br />water use evaluation. Of all the surface water sites downstream of <br />Seneca II-W, only Sites WSDS (Dry Creek), WSSF3 (Sage Creek), WSH7 (mid- <br />Hubberson Gulch) and WSHF1 (lower Hubberson Gulch) have their waters <br />used for irrigation. Following is a list of standards exceeded this <br />year. <br /> Parameter # of Sites / # of Excursions <br /> Manganese (CDOH, SW, irrigation) 11/17 <br /> Review of this list indicates that only one CDOH surface water <br /> agricultural use standards was exceeded. The manganese standard was <br /> exceeded at eleve n 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-W region, a more <br /> appropriate (EPA) standard would be 10 mg/1. The maximum manganese value <br />21 <br />