2001-12-11_PERMIT FILE - C1980007A (4)

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PART 1 Puez 13 Permit No. CO-0038776 • f3. \IONITORUVG REQUIItEi\IENTS 4. Chronic WET Tesstin2 - Outfall 012 (continued) If no pattern of toxicity is found the toxicity episode is considered to be ended and routine testing is to resume. if a pattern of toxicity is found, a PTI/TIE investigation is to be performed. If a pattern of tonicity is not demonstrated but a significant level of erratic tonicity is found, the Division may require an increased frequency of routine monitoring or some other modified approach. (d) PTIrI'IE • • ~. . The results of the PTIrTI£ inytstieation are to he received by the Division within ]20 days of the_ demonstration of chronic WET in the routine test. as defined above. or if accelerated testine is oerfatmed, the date the pattern of toxicity is demonstrated. A status reonrt is to be orovided to the Division at the 30, 60 and 90 der onints of the P'I'Ir!'fE invecti¢ationT The Division may extend the time frame for investigation whore reasonable justification exists. A request for an extension must be trade in writing and received prior to the 120 day deadline. Such request must include a justification and supporting data for such an extension. must by conducted within the allowed 120 day time frame. The permittee may use the time for investigation to conduct a PTI or move directly into the TIE. APT[ consists of a brief search for possibly sources of WET, which might reveal causes of such toxicity and appropriate corrective actions more simply and cost effectively than a formal TiE. If the PTI allows resolution of the WET incident, the TIE nerd not necessarily be conducted. If, however, WET is no[ identified or resolved during the PTI, the TIE Any permittee that is required to conduct a PT[/TIE investigation shall do so in conformancz with procedures identified in the following documents, or as subsequently updated: I) Toxicity identificatmn Evaluation: Characterization of Chronically Toxic EFFluznts. Phase I, EPA/600/G-91/OOSF htay 92, 2) \lethnds for .4ouatic Toxicity idzntification Evaluations. Phase I Toxicity Characterization Procedures, EP.4/600/G-911003 Feh. 9f and 3) Methods for Aquatic Toxicity Idzntification Evaluations, Phase II Toxicity Identification Procedures, EPA/G00/3- 88/035 Fzb. 1989. A fourth document in this serizs is Methods for Aquatic Toxicity Identification Evaluations, Phase III Tonicity Confirmation Procedures, EP.4/600/3-88/036 Feh. 1989. As indicatzd by the tidy, this procedure is intendyJ to confirm the[ the suspected toxicant is truly thz toxicant. This investigation is optional. Within 90 days of the determination of the toxicant or no later than 210 Jays after dymonstration of toxicity, whichever is sooner, a control program is to he developed and received by the Division. The pro_ram shall set down a method and prnczdure for elimination of the toxicity to acceptably levels. (y) Rzouest Far Relief The permittzz may request relief from furthzr im~ystigauon and tzsnn; where the toxicant has not hzen dztzrminzJ and the Division has dettrminzd suitable trzatment does not appear possibly. In rzquesting such rzlief, tht pennwc_ shall submit material sufficient to zstablish thz Following: (i) It has complizd with tzrms :md conditions of the pzrmit'compliance schtduly for thz PT1i TIE inazstig:ui~.n and other appropriate conditions as may have been required by thz Division; (ii) Durin_ the period of the toxicity incident it has heen in compliancz with all othr. ~zrmit condition., including, in the cast' of a POTW, prz-treatmznt reyuirzments; (iii) Dunng the period of the toxicity incident it has properly maintamzd and operatzd all Fxcifities anJ svsteni< of treatment and control; and :r:uin• i r ~,;