2009-03-06_PERMIT FILE - C1981012A ‎(6)‎

• Permit No: C1981012A
• IBM Index Class Name: Permit File
• Doc Date: 3/6/2009
• Section_Exhibit Name: Exhibit 22 NPDES Permit
• Media Type: D
• Archive: Yes

PARTI
Page No. 13
Permit No.: CO-0000906
• iii. Proceed to conduct the PTI/TIE investigation as described in Part I.AAA, or
iv. Conduct accelerated testing using the single species found to be more sensitive.
t on.cTesingfwill bres e at Ileastion e14
If accelerated testing is being peroPattern of Toxicity/No city/No Toxicity provide written
calendar days of completion of the
every two weeks for up to five tests until; 1) two consecutive tests fail or three of five tests fail, in which case a pattern o
toxicity has been demonstrated or 2) two consecutive tests pass or three of five tests pass, in which case no pattern of
toxicity has been found. 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 toxicity is
not demonstrated but a significant level of erratic toxicity is found, he Division may require an increased frequency of
routine monitoring or some other modified approach.
d. PTI/TIE
The results of the PTI/TIE investigation are to be received b the Division within 120 lays of the demonstration
of chronic WET in the routine test as defined above or if accelerated testin is erformed the date the attern of
toxicity is demonstrated. A status report is to be provided to the Division at the 30, 60 and 90 da oints of the
PTI/TlE investigation. The Division must be made in writing and received prior to the 120 day deadline. Such request must exists.
A request reques st for an extension n
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 of such toxicity and appropriate corrective actions inci
the
TIE more simply and cost ted. If, however WET is not identified or resolved during he TIV he TIE must be c nducted of
• necessarily be conduc ,
within the allowed 120 day time frame.
Any permittee that is required to conduct a PTI/TIE investigation shall do so in conformance with procedures identified
in the following documents, or as subsequently updated: 1) Toxici Identification Evaluation: Characterization of
ChronicallyToxic Effluents, Phase I, EPA/600/6-91/005F May 92, 2) Methods for Aquatic Toxicity Identification
Evaluations Phase I Toxicity Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 3) Methods for Aquatic
Toxici Identification Evaluations Phase II Toxicity Identification Procedures, EPA/600/3-88/035 Feb. 1989.
A fourth document in this series is Methods for Aquatic Toxicity Identification Evaluations Phase III Toxicity
Confirmation Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to 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 210 days after demonstration of toxicity, whichever is
sooner, a control program is to 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 peririittee may request relief from further investigation and testing where the toxicant has not been determined and
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 WQCD;
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 incident it has properly maintained and operated all facilities and systems of
treatment and control; and