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Spoil Spring 4 (WSSPG4) was first sampled in 2003. It contains the <br />combined discharges of the backfilled A and B pits. It is sampled at the <br />outlet of the haul road culvert just above Pond 006. Its EC plot <br />indicates a decreasing 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, December 2005). <br />Table 10 provides a comparison of this year's surface water quality to <br />agricultural standards. This Paradox database generated table does not <br />include the units of concentration (mg/1 or ug/1) for each parameter. <br />The units used for each parameter are the same as those listed on the <br />standards table (Table 9) and are also the same as those used in the <br />water quality reports. The frequency column on Table 10 indicates the <br />number of exceedences out of the total number of samples (i.e., 1/2 <br />indicates one exceedence out of two samples). Below is a summary of <br />standards that were exceeded. Given in parenthesis is the source and use <br />of each standard. Although the CDOH does not indicate between livestock <br />and irrigation uses in their surface water agricultural standards, they <br />have done so in their similar ground water agricultural standards (see <br />Table 5). For the sake of discussion, SCC chooses to use those ground <br />water use standards classifications (livestock or irrigation) for <br />surface water use evaluation. Of all the surface water sites downstream <br />of Seneca II-W, only Sites WSDS (Dry Creek), WSSF3 (Sage Creek), WSH7 <br />(mid-Hubberson Gulch) and WSHF1 (lower Hubberson Gulch) have their <br />waters used for irrigation. Following is a list of standards exceeded <br />this year. <br /># of Sites / # of Excursions <br />Manganese (CDOH irrigation) <br />Potentially Dissolved 5/9 <br />Manganese (CDOH irrigation) <br />Total 8/10 <br />21 <br />