HYDRO21916

• Permit No: C1980007
• IBM Index Class Name: Hydrology
• Doc Date: 3/6/1995
• Doc Name: CDPS permit
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

PART t
Page 11
Permit No. CO-0038776
6. MONITORING REQUIItEMENTS
3. Acute WET Testing - Oulfalls 002. 004 end 011 (continued)
Any permittee that is required to conduct a PTIlfIE investigation shall do so in conformance with procedures
identified in the following documents, or as subsequently updated: 1) Methods for Aquatic Toxicitv Identification
Evaluations, Phase I Toxicitv Characterization Procedures, EPA/600/6-91/003 Feb. 91 and 2) Methods for Aquatic
Toxicitv Identification Evaluations. Phase ii Toxicitv Identification Procedures. EPA/600/3-88/035 Feb. 1989.
A third document in this series is Methods for Aquatic Toxicity Identification Evaluations. Phase !II Toxicitv
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 far elimination of the tonicity to acceptable levels.
(e) Request For Retie(
The permittee may request relief from Further investigation and testing where the toxicant has not been determined
and the Division has deterrttined suitable treatment does no[ appear possible. In requesting such relief, the pennittee
shall submit material sufficient to establish the following:
(i) It has complied with terms and conditions of the permit compliance schedule for the PTIlTIE investigation
and other appropriate conditions as may Gave 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 rnain[ained 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 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 oncoin,_
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) Spontaneous Disaooearance
1F toxicity spontaneously disappears at any time after a test failure, the petmittee shall notify the Division in writin_'
within ]4 days of a demonstration of disappearance of the toxicity. The Division may require 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 identifieJ, the toxicity incident response is
considered closed and normal WET testing shall resume.
(g) Toxicitv Reooener
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 protocol, or any other conditions related to the control of toxicants if one qr more q(
the following events occur:
IN 11111' 4/9/YJ