2010-03-22_REPORT - C1994082 (2)

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- Spoil Spring 2 (YSSPG2). This spoil spring was discovered in May 2005 below Stock Pond 011A (i.e., above NPDES Pond 011). It is normally dry in the fall. Its TDS plot displays an increasing trend. - Spoil Spring 3 (YSSPG3). This spoil spring was discovered in September 2005 above NPDES Pond 012. Its TDS plot displays an increasing trend. - Spoil Spring 4 (YSSPG4). This spoil spring was discovered in June 2006, in the main channel that feeds NPDES Pond 012. It is located to the north of Spoil Spring 3. Its TDS plot displays a decreasing trend. Comparison of Surface Water Quality to Water Use Standards. SCC has compiled a list of surface water :standards for agricultural uses (Table 11). This list is composed of CDPHE surface water agricultural use standards (CDPHE, Reg.31, November 2009). Table 12 provides a comparison of surface water quality to agricultural is standards. This Paradox database generated table does not include the units of concentration (mg/1 or ug/1) for each parameter. The units used for each parameter are the same as those listed on the standards table (Table 9) and are also the same as those used in the water quality reports. The frequency column on Table 10 indicates the number of exceedances out of the total number of samples (i.e., 112 indicates one exceedance out of two samples). Below is a summary of standards that were exceeded. Given in parenthesis is the source and use of each standard. Although the CDPHE does not indicate between livestock and irrigation uses in their surface water agricultural standards, they have done so in their similar ground water agricultural standards (see Table 5). For the sake of discussion, SCC chooses to use those ground water use standards classifications (livestock or irrigation) for surface water use evaluation. Following is a list of standards exceeded this year. Parameter # of Sites of Excursions Manganese (CDPHE irrigation) 7/9 12