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Detection Limit (MDL) / the number of exceedances between the MDL and <br />the Practical Quantitation Level (PQL) / censored, that is, the number <br />of sample values below the MDL but the MDL was higher than the standard <br />/ the total number of samples. Below is a summary of standards that were <br />exceeded. Given in parenthesis is the source and use of each standard. <br />Although the CDPHE does not differentiate 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, PSCM chooses to use those ground water <br />use standards classifications (livestock or irrigation) for surface <br />water use evaluation. <br />Parameter <br />Manganese (CDPHE irrigation) <br /># of Sites / # of Excursions <br />1/2 <br />This summary indicates that only one of the CDPHE surface water <br />agricultural use standards were exceeded. The manganese standard was <br />exceeded at one site. Site NPDES3 exceeded the 0.2 mg/l standard twice <br />in 2018 with concentrations of 0.368 and 0.806 mg/l. <br />Table 12 in Appendix A shows the CDPHE receiving stream standards for <br />Fish Creek (Yampa Segment 13g). This new segment came into effect <br />December 31, 2014. Table 13 in Appendix A provides a comparison of <br />those standards to water quality data collected this year from Site <br />SSC10 in the Fish Creek basin. The stream standards for Fish Creek are <br />based on aquatic life standards, even though there are no fish present <br />in the upper portion of the tributary. Standards that were exceeded are: <br />Parameter <br />Iron, Total Rec. <br />Selenium <br /># of Sites / # of Excursions <br />1/1 <br />3/4 <br />The mercury MDL is 0.20 ug/l. All test values this year were less than <br />the MDL. The mercury standard is 0.01 ug/l. <br />17 <br />