PERMFILE51163

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: NPDES PERMIT NO. CO-0000221
• Section_Exhibit Name: TAB 15 APPENDIX 15-4
• Media Type: D
• Archive: Yes

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Perms Nu CO-OQ(l(1231
• A. 'fF,RV9ti AYD CONDITIONS
1. lVhule Effluent Toxicity Testine Requirements (Acute! - Outfulls 00? 003, 005, OOfi. 1110. Ol 1, UI'_. 013. 01~. 0l6
^nd D17 (continued)
The permutee may use the time fur investigation to conduct a PTI or move duectly imo the TIE. A PTI consists of a
brief search for possible sources of WET, which might reveal causes of such to.xtcirj and appropnate corrective
actions more simply and cost effectively than a formal TIE. If the PTI allows resolution of the WET inctdent, the
TIE need nor necessarily be conducted. 1(. however, WET is not identified or resolved during the PTI, the TIE must
be conducted within the allowed I?0 day time frame.
Any permutee that is required to conduct a PTVTfE invesugmion shall do so in conlormance with procedures
identified m the following documents, or as subsequently updated: 1) Methods• (or Aquatic Toxicity Identification
Evaluations Phase I Tozicirv Characterization Procedures, EPA/600 /6-9 11003 Feb. 91 and 2) Methods for Aquatic
Toxicity Identification Evaluations. Phase II Toxicity IdentiFication Procedures, EPA/600/3-88!035 Feb. 1989.
A third document in this series is Methods for Aquatic Toxicity ldentificwon Evaluations Phase III Tonicity
Confirmation Procedures, EPA/600!3.88/036 Feb. 1989. As indicated by the title, this procedure is intended to
conFum 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 aRer 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.
Request For Relief
• The permutee may request relief from further investigation and testing where the toxicant has not been determined
and the Division has determined suitable treatment does not appear possible. In requesting such relief, the permutee
shall submit material sufficient to establish the following:
I. It has complied with terms and cooditions of the permit compliance schedule for [he PTI/TIE investigation and
other appropriate conditions as may have been required by the Division;
ii. During the period of the toziciry 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
iv. Despite the circumstances described in paragraphs (I) and (iii) above, the source and/or cause of toziciry 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 exceedance of the toziciry limit shall remain.
Soontaneous Disapdrearance
I(toxiciry spontaneously disappears at any time alter a test failure, the permutee shall notify the Division m writing
within 14 days of a demonstration of disappearance of the toxicity. The Division may regwre the permutee to
develop and submit additional in(ormatio^ which may include, but is not limited to, the results of additional iesiing.
If no pattern of toxicity is identified or recurring toziciry is not identifed, the toxictry incident response is considered
closed and normal WET testing shall resume.
• Corrected 71?5197 _
Amendment No I Issuedv~_ Q QQ~_ Effective ~~~1 _l ~~