PERMFILE67115

• Permit No: C1981022A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Discharge Permits
• Section_Exhibit Name: Exhibit 2.03-E4 Part 3a
• Media Type: D
• Archive: Yes

PARTf
Page No. h
Permit No. CO-0000132
• ,4. DEF t[NITION OF EFFLUENT LID-IITATIONS
2. Acute WET Testing - Outfall 011 (continued)
(.d) PTI/TIE
The results of the PTI/T7E investigation are to be received by [he Division within 130 days of the demonstration
of acute 1VET in the routine test as defined above or if accelerated testing is performed the date the pattern of
toxicity is demonstrated. A status report is to he provided [o the Division at the 30. 60 and 90 day points of the
PTI/TiE investigation. The Dtvision may extend the time frame for investigation where reasonable justification
exists. A request for ttn extension must be made in writing and recetved prior to the 120 day deadline. Such request
must include a justification and supporting data for such an extension.
The permittee may use the time for investigation to conduct a PTI or move directly into the TIE. A PTI consists of a
brief search for possible sources of WET, which might reveal causes o(such toxicity and appropriate corrective
actions more simply artd cost effectively than a formal TIE. If the PTI allows resolution of the WET incident, the TIE
need not necessarily be conducted. !f, however, WET is not tdennfied or resolved during the PTI, the TIE must be
conducted within the allowed 120 day time frame.
Any permittee that is required to conduct a PTi/TIE investigation shall do so in conformance wish procedures
identified in the following documents, or as subsequently updated: 1) Methods for Aquatic Toxicirv Identification
Evaluattons. Phase (Toxicity Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 2) Methods for Aquatic
Toxicity Identification Evaluations Phase II Toxicirv Identification Procedures, EPA/600/3-88/035 Feb. 1989.
A third document in this series is Methods for Aquatic Toxicity Identification Evaluations. Phase 11[ Toxicity
Confirmation Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended [o
• confirm that the suspected toxicant is truly the toxicant. This investigation is optional.
Within 90 days of the determination of the toxicant or no later than 2I0 days after demonstration of toxicity,
whichever is sooner, a control program is [o be developed and received by the Division. The program shall set down
a method and procedure for elimination of the toxicity to acceptable levels.
(e) Request For Relief
The permittee may request relief from further investigation and testing where the toxicant has not been determined and
the Division has de[ermtned suitable treatment does not appear possible. In requesting such relief, the permittee shall
submit material sufficient to establish the following:
(i) It has complied with terms and conditions of the permit compliance schedule for the PTI/TIE investigation
and other appropriate conditions as may have been required by the Division;
(ii) During the period of the toxicity incident it has been in compliance with all other permit conditions,
including, in the case of a POTW, pretreatment requirements;
(iii) During the period of the toxicity incldent it has properly maintained and operated all facilities and systems of
treatment and control; and
(iv) Despite the circumstances described in paragraphs (i) and (iii) above, the source and/or cause of toxtci[y
could not be located or resolved.
If deemed appropriate by the Division, the permit or the compliance schedule may be modified to revise the ongoing
monitoring and toxicity investigation requirements to avoid an unproductive expenditure of the permittee's resources,
provided that the underlying obligation to eliminate any continuing exceedence of the toxicity hmn shall remain.
See Part I.C. for Definitions. ~
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Amendment No. 5 Issued 3~'t~~ U 20~ Effective