HYDRO28507

• Permit No: C1981010
• IBM Index Class Name: Hydrology
• Doc Date: 7/1/1991
• Doc Name: CDPS RATIONALE- AMENDMENT 1
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PART I
Page No. 8
Permit No. CG-0032115
,t. DEFINTITON OF EFFLUENT LQ141TATIONS
2. Acute WE:T Testine - OutFalls OOI, 002, 005, 009, 011, 013, O15, 016, 017 and 019
Any permittee that is required to conduct a PTI/T[E investigation shall do so in conformance with procedures
identified in the following documents, or as subsequently updated: 1) Methods for Aquatic Toxici Identification
Evaluations. Phase !Toxicity Characteriution Procedures, EPA/600/6-91/003 Feb. 91 and 2) Methods for Aouatic
Toxicirv Identification Evaluations. Phase II Toxicity Identification Procedures, EPA/G00/3-88/035 '.Feb. 1989.
A third document in this series is Methods for Aquatic Toxicity Identification Evaluations, Phase Ill Toxicity
Confirmation Procedures EPA/tr00/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to
wnfirm 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 2l0 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) Rearrest For Relief
The permittee may request relief from further investigation and testing where the toxicant has not been determined
and dte 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 [erws 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 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 rouse 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 exceedence of the toxicity limit shall remain.
(f7 Spontameous Disappearance
If toxicity spontaneously disappears at any time after a test failure, the perrnittee shall notify the Division in writing
within 14 days of a demonstration of disappeazance of the toxicity. The Division tray require the permittee [o
develop and submit additional information which tray include, but is not limited to, the results of additional testing.
If no pattern of toxicity is identified or recurring toxicity is not identified, Ute toxicity incident response is
considered closed and normal WET testing shall resume.
(g) Toxiciri Reocener
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 schedule, a change in the
whole effluent toxicity testing protowl, or any other conditions related to the control of toxicants if one or more of
the following events occur:
(i) Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation.
Amendment No. l Issued ~~Effective JUL 1 -1997
LYDN N,.~t., L, IM,