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The sulfide data presented in Appendix E are the total of both the <br />ionized (S-) and un- ionized (H;S) forms of hydrogen sulfide. The un- <br />ionized form is the potentially toxic form, and is what the CDPHE water <br />quality standard is based upon. A procedure for calculating the un- <br />ionized form may be found on the website: <br />http: / /www.mullalyengineering.com.au /images /product /file /Problem of Hydr <br />ogen Sulphide in Sewers.pdf page 5, Table 1. No excursions of the 0.002 <br />mg /l un- ionized sulfide standard occurred this year. A total of five <br />samples from five sites had sulfide values that were less than an <br />elevated detection limits (0.03 and 0.08 mg /l vs. a normal detection <br />limit of 0.02 mg /1), which was higher than the CDPHE standard of 0.02 <br />mg /1. <br />Likewise, the same samples with the addition of WSSF3 had mercury values <br />that were less than the detection limit of 0.2 ug /1, which was equal to <br />the CDPHE standard of 0.2 ug /1. <br />The aquatic life ammonia standard is dependent on pH and temperature. <br />The detection limit for ammonia is 0.05 mg/l. All values above detection <br />limit are compared to table standards found on this website, page 8'7: <br />http: / /www.epa.5.ov /waterscience /criteria /ammonia /99update.pdf <br />No ammonia excursions occurred this year. <br />The drinking water standard for mercury is 2 ug /1. The aquatic life <br />standard for mercury is 0.01 ug /l, which is set to protect the average <br />human consumer of fish. SCC's lab uses a method with a detection limit <br />of 0.2 ug /1. None of the samples collected this year were above the <br />detection limit. During the last NPDES permit renewal, the CDPHE <br />performed a reasonable potential analysis on SCC's outfalls. it <br />determined that there was no reasonable potential for SCC's outfalls to <br />exceed the mercury limit; therefore, mercury monitoring is no longer <br />required for SCC's outfalls. <br />NPDES Effluent Criteria (Permit No. CO- 0000221). One excursion of NPDES <br />limits occurred this year. At Outfall 016, the total recoverable iron <br />22 <br />