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Table 12 shows the CDPHE receiving stream standards for Fish Creek <br />(Yampa Segment 13b) . Table 13 provides a comparison of those standards <br />to water quality data collected this year from NPDES and stream sites in <br />the Fish Creek basin. The stream standards for Fish Creek are based on <br />aquatic life standards, even though there are no fish present in the <br />upper portion of the tributary that NPDES8 discharge into. Standards <br />that were exceeded are: <br />Parameter # of Sites / # of Excursions <br />Iron Total Recoverable 2/3 <br />Selenium Diss. (Acute) 1/1 <br />Selenium Pot. Diss. (Acute) 1/2 <br />Selenium Total Recoverable (Acute) 1/2 <br />All iron excursions were a result of high suspended solids in Fish <br />Creek. <br />SCC ran selenium in three forms this year, often on the same samples, so <br />as to investigate the difference in the three methods. However, in a <br />regulatory sense, the potentially dissolved form is applicable to NPDES <br />sites, and the dissolved form is applicable to stream sites. The total <br />recoverable form was run only as a quality control check. The following <br />discussion will focus only on potential dissolved excursions at NPDES <br />sites and dissolved excursions at steam sites. There were no excursions <br />at stream sites this year. <br />One NPDES site, NPDES8, exceeded the potentially dissolved chronic <br />standard, 4.6 ug /l twice this year. The value on April 18`h was 6.1 ug /l <br />and the value on May 6nd was 6.6 ug /1. The selenium value downstream at <br />stream site SSF13 (located Fish Creek) on May 14nd was only 0.5 ug /l <br />(dissolved). This indicates that while NPDES8 was out of compliance in <br />May, Fish Creek was in compliance. Site SSF13 was not sampled in April, <br />however, a similar situation (Outfall out of compliance, but stream in <br />compliance) is expected. See the following ` NPDES Effluent Criteria' <br />section for a further discussion. <br />11 <br />