Laserfiche WebLink
Parameter # of Sites / # of Excursions <br />Manganese (CDPHE irrigation) 5/6 <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 five sites. All sites had manganese values less than 1 mg/l. <br />It should also be noted that the site on Grassy Creek (SSG1) that is <br />upstream of PSCM discharges has often experienced exceedances of the 0.2 <br />mg/l standard. <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 />Mercury <br />Selenium <br /># of Sites / # of Excursions <br />1/1 <br />1/1 <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/1. <br />The selenium standard of 4.6 ug/l was exceeded at SSSC10 with a <br />concentration of 5.2 ug/l in April. Lewis Shale soils have contributed <br />to the high selenium values observed in many of the streams in this <br />area. However, there is a temporary modification (expires December 31, <br />2018) of the selenium standard as "current conditions". Therefore, this <br />excursion is not considered a standard exceedance. <br />Table 14 in Appendix A shows the CDPHE receiving stream standards for <br />Upper Grassy Creek (Yampa Segment 13). This new segment came into effect <br />December 31, 2014. Table 15 in Appendix A provides a comparison of <br />those standards to water quality data collected this year from NPDES and <br />17 <br />