HYDRO25968

• Permit No: C1981010
• IBM Index Class Name: Hydrology
• Doc Date: 9/5/2000
• Doc Name: RATIONALE FOR PUBLIC NOTICE
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PARTI
Page No. 8
Permit No. CO-0032115
A. DEFINITION OF EFFLUENT LDYII'l'ATIONS
2. ActRe WET TesYinc - OutfttLLs 001902.005. 009. 011. 013. 015. 016. 017. 019. 020. 021. and 023 (continued)
Any permince that is required to cottdutt a PTI/TIF. investigation shall do so in confo^^eMe with procedures identified in
the followwg documents, or as subsequently updated: 1) Methods for Aauazic Toxicity Identification Evahtations. Phase I
Toxicity Charaderiration Procedures, EPA/600/6-91/003 Feb. 91 and 2) Methods for Aquatic Tonicity Identification
Eyahyrv+ns. Phase II Toxicity Identifica[ion Procedures, EPA/600l3-88!035 Feb. 1989.
A thud Boatmen[ in this series is Methods for Aquatic Toxicity Identification Evahuuiogs. Phase ]II Toxicity Cortfinr~etion
Procedures, EPA/600/3-88/036 Fob. 1989. As indicated by the title, this procedure is intended to confirm thst the
suspected toxicant is truly the toxicant. This investigation is optional.
Within 90 days of the determinelian of the toxicant or m later than 210 days after demonstration of toxicity, whichever is
sooner, a wmrol program is to be developed and received by the Division. The program shell set down a method end
procedure for elimination of the Wxicity to acceptable levels.
(e) Rectors! For ReGet
The parmittce may request relief from further investigation and testing where the toxicant has not been determined and the
Division has determined suitable treatment does ml appear possible. in requesting such relief, the permittee shell submit
material sufficient to establish the following:
(i) It has complied with terms earl cmditions of the permit compliame schedule for the PTUTIE investigation and other
appropriate conditions ar may have been required by the Division;
(u) During the period of the toxicity incident it has been in compliance with all other permit conditions, imhuling, in the
case of a POTW, pretreatment requirements;
(ui) During the period of the toxicity imident it has properly maintained and opereted all facilities and systems of
traetmam o>id comrol; a~
(iv) Despite the ciraimataaces descnbed in paragraphs (i) a~ (ui) 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 regttirremeds to avoid m unproductive expenditure of the permittce's resources,
provided that fhe underlying abGgation to eliminate any continuing exceedeme of the toxicity limit shall remain.
(t) Soootaneotu Disaoorarance
if toxicity spontaneously disappears at any time after a test failure, the pemoittce shall notify the Division in writing within
14 days of a demonstration of dissppeengce of the toxicity. The Division may require the permittce to develop a~
submit additional information which may imlude, bui is not limited to, the results of additio~l testing. If m panem of
toxicity is identified or recurring toxicity is not identified, the tonicity incident response is considered closed and mrmal
WET testing shall resume.
(g) Toxicity Reooener
This permit may be reopened and modified (following Proper administrative procedures) to include cew compliance dates,
additional or modified numerical permit limitations, a new or different mmpliame schedule, a change in the whole
effhieot tonicity testing protocol, or any other conditions related to the control of tonicaats if one or more of the following
events occur:
(i) Toxicity has bcen demonstrated m the effluent end the permit does mt contain a toxicity limitation.
Amendment No. 1 Issued MAY 30 1997 Effective JUL 1 1997
Amendment No. 3 issued OCT 26 1998 Effective DEC 1 1998
Amendment No. 4 issued Effective