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are not in our current NPDES permit, as it is currently under <br />administrative extension since 10/31/11. The facility and outfall are <br />being properly operated and maintained. This possible exceedance <br />occurred as a result of spring snowmelt and runoff. In addition, we did <br />get about 2 inches (melted water equivalent) of late, heavy snow in <br />April prior to the sampling event. Therefore, we consider this to be an <br />upset condition <br />For NPDESII, the one excursion of the mercury stream standard noted on <br />Table 14 was not a NPDES permit limit excursions. There is no permit <br />limit for mercury at this outfall. This outfall will not have a mercury <br />limit until the CDPHE performs a `Reasonable Potential' analysis during <br />the next NPDES permit renewal. <br />For NPDESI3, the two excursions of the selenium stream standard noted <br />above were not NPDES permit limit excursions. The permit limit for this <br />outfall for selenium is to "Report" only. This outfall will not have a <br />selenium limit until the CDPHE performs a `Reasonable Potential' <br />analysis during the next NPDES permit renewal. <br />For NPDESI3, the one excursion of the total recoverable iron stream <br />standard noted above was not NPDES permit limit excursion. The permit <br />limit for iron at this outfall is "Report" only. This outfall will not <br />have a iron limit until the CDPHE performs a `Reasonable Potential' <br />analysis during the next NPDES permit renewal. <br />Surface Water Summary <br />The Yoast Mine PHC (PAP Tab 17, Attachment 17 -5) predicts TDS increases <br />to be observed at various stream sites during the irrigation season <br />(June - September). The following table outlines those predictions along <br />with this year's observed averages. <br />15 <br />