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Comparison of Surface Water Quality to Water Use Standards. SCC has <br />compiled a list of surface water standards for agricultural uses (Table <br />10). This list is composed of CDPHE surface water agricultural use <br />standards (CDPHE, Reg.31, November 2009). <br />Table 11 provides a comparison of this year's surface water quality, <br />including springs, to agricultural standards. This Paradox database <br />generated table does not include the units of concentration (mg /1 or <br />ug /1) for each parameter. The units used for each parameter are the same <br />as those listed on the standards table (Table 10) and are also the same <br />as those used in the water quality reports. The frequency column on <br />Table 11 indicates, in this order: uncensored, that is, the number of <br />exceedances above the Method Detection Limit (MDL) / the number of <br />exceedances between the MDL and the Practical Quantitation Level (PQL) / <br />censored, that is, the number of sample values below the MDL but the MDL <br />was higher than the standard / the total number of 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 CDPHE 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. Of all the <br />surface water sites downstream of Seneca II -W, only Sites WSD5 (Dry <br />Creek), WSSF3 (Sage Creek), WSH7 (mid - Hubberson Gulch) and WSHF1 (lower <br />Hubberson Gulch) have their waters used for irrigation. Following is a <br />list of standards exceeded this year. <br />Parameter # of Sites / # of Excursions <br />Manganese (CDPHE irrigation) 9/11 <br />This summary indicates that only one CDPHE surface water agricultural <br />use standards was exceeded. The manganese standard was exceeded at nine <br />sites. However, as indicated in the recently revised CDPHE Regulation <br />31, the standard of 0.2 mg /l, applies to plants grown in acidic ( <6.0 <br />pH) soils. In alkaline soils, as are found in the Seneca II -W region, a <br />19 <br />