PERMFILE45992

• Permit No: C1996083A
• IBM Index Class Name: Permit File
• Doc Date: 9/19/2003
• Section_Exhibit Name: Exhibit 11 Colorado Discharge Permit - NPDES
• Media Type: D
• Archive: Yes

PART I
Page 7
_ , Permit No. CO-0044776 •
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<: `: A. DEFINTTION OF EFFLUENT LII~IITATIONS
6. Whole Effluent Touciri~ Testing RggLrementc fAcutel - Ontf 11 002 (con 'n ~edl ~~
Any permittee that is required to conduct a PTI/TIE investigation shall do so in conformance with procedure:-
identified in the following documents, or as subsequently updated: 1) Methods for Aquatic Toxicity
identification Evaluations. Phase I Toxicity Characterixa6on Procedures, EPA/600/6-91/003 Feb. 91 and 2)
Methods for Agy+,atic Tonicity Identification valuations Phase R Toxicityy Identification Procedur c,
EPA/60013-88/035 Feb. 1989.
A third document in this series is Methods for Aouatc Toxicity Identification Evaluations. Phase III Tonicity
Confirmation Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended
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 210 days after demonstration of toxicity,
whichever is sooner, a control program is to be developed and received by the Division. The program shall
down a method and procedure for elimination of the toxicity to acceptable levels.
e. Begµest For Relief
The permittee 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 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/T'IE invest~-
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 incident it has properly maintained and operated all facilities and system -
of treatment and control; and
iv. Despite the circttmstances described in pazagraphs (I) and (iii) above, the source and/or cause of toxicity
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
toxicity limit shall remain.
f. ~pont?neous Disanpea_rance
If toxicity spontaneously disappeazs at any time after a test failure, the perminee shall notify the Division in
writing within 14 days of a demonstration of disappeazance of the toxicity. The Division may requ've the
permittee to develop and submit additional information which may include, but is not limited to, the results of
additional testing. If no pattern of toxicity is identified or recurring toxicity is not identified, the toxicity
incident response is considered closed and normal WET testing shall resume.
g. Tozicily Reopener
This permit may be reopened and modified (following proper administrative procedures) to include new
compliance dates, additional or modified numerical permit limitations, a new or different compliance sch c,
change in the whole effluent toxicity testing protocol, or any other conditions related to the control of toxicanrc
if one or more of the following events occur:
I. Toxicity has been demonsvated in the effluent and the permit does not contain a toxicity limitation.
Amendment No. 1 Issued E 2 1 9 Effective AUGUST 1 1 999