Laserfiche WebLink
open Sulphide in Sewers.pdf page 5, Table 1. No excursions of the 0.002 <br />mg /l un- ionized sulfide standard occurred this year. <br />The aquatic life ammonia standard is dependent on pH and temperature. <br />The detection limit for ammonia is 0.05 mg /1. All values above detection <br />limit are compared to table standards found on this website, page 87: <br />http: / /www.epa.gov /waterscience /criteria /ammonia/99update.pdf <br />No ammonia excursions occurred this year. <br />SCC runs two different mercury tests, a high level test with a MDL of <br />0.2 ug /l (for streams) and a low level test with a MDL of 0.0002 ug /l <br />(for certain NPDES sites only). All high level test values this year <br />were less than the detection limit, which is normally 0.2 ug /l. NPOES11 <br />exceeded the 0.01 ug /l mercury aquatic life stream standard with a value <br />of 0.013 ug /l on April 29th. This is the first time this site has ever <br />exceeded this standard. See the following `NPDES Effluent Criteria' <br />section for a further discussion. <br />NPDES Effluent Criteria (Permit No. CO- 0000221). Two excursions of <br />NPDES effluent criteria occurred this year. On May 2, a pH value of 9.53 <br />was measured at Outfall 013. The limit is 9.0. The high pH is mostly <br />likely due to the presence of algae in the outfall's pond. The <br />phenomenon of algae causing high pH values is well documented. One such <br />article may be found on this website: <br />https: / /srac.tamu.edu/ index. cfm / event /getFactSheet /whichfactsheet /205/ <br />The second excursion occurred on April 29th at Outfall 011. The total <br />recoverable iron (TR Fe) value was 3.61 mg /l. The monthly average TR Fe <br />limit in the NPDES permit is 1 mg /l as a monthly average. There is no <br />daily max limit. However, there was a `temporary modification' of the <br />TR Fe limit on Grassy Creek (to which 011 reports to) at the time the <br />CDPS permit was last amended (5/26/10) . That `temp. mod.' expired on <br />5/31/11, and the CDPS permit reflects that expiration date in its <br />effluent limits. That `temp. mod.' was then extended to 12/13/13, and <br />then later extended to expire 12/31/14. The `temp. mod. (type iii)' sets <br />the iron standard at `existing quality'. These most recent `temp. mod's' <br />14 <br />