REP01568

• Permit No: C1981018
• IBM Index Class Name: Report
• Doc Name: AHR REQUIREMENTS & INFORMATION PERMIT # C-81-018
• Permit Index Doc Type: HYDROLOGY REPORT
• Media Type: D
• Archive: No

PART I
Page ix
Pemtit No. CO-0000396
B. MOMTORJTIG REQUIREMENTS
3. Acute WET Testine-Outfalls 004. 023. 024 and 026 (rnn[inued)
If ao pattern of toxicity is found the toxicity episode is cansiderod to be ended and routine testing is to resume. If a
pattern of toxicity is found, a PTI/ITE investigation is to be performed. If a pattern of toxicity is not demonstrated
but a significant level of erratic tonicity is found, the Division may roquiro m increased frequency of routine
monitoring or some other modified approach.
(d) PTIlI'IE
reasonable justifirxtian exists. A rrxprest for an exteosioo must be made in writing and received prior to the 120 clay
deadline. Such request must include a justification and supporting data for such an extension.
ypoints oC the PTVT~ investigation. The Division may extend the time frame for investigation where
The permittee may use the time for investigation to conduct a PTI or move directly into the TIE. A PTI consists of
a brief search for possible sources of WET, which might raven! causes of such toxicity and appropriate corrective
actions more simply and cost effectively than a formal TIE. If the PTI allows resolution of the WET incident, the
TIE need not necessarily be conducted. If, however, WET is cot identified or resolved during the PTI, the TIE
must be conducted within the allowed 120 day time fame.
Any permittee that is required to conduct a PTIfTIE investigation shall do so in conformance with procedures
identified in the following documents, or as subsequently updated: 1) Methods (or Aquatic Toxicity Identification
Evaluations, Phase T Toxicity Cheracteriration Procedures. EPA/600/6-91/003 Feb. 91 and 2) Methods for Aquatic
Toxicity Identification Evaluations. Phsse TT Tonicity Identification Procedures. EPA/600/3-88/035 Feb. 1989.
A third document in this series is Methods for Aquatic Tonicity Tdentification Evaluations. Phase TIT Toxicity
Confirmation Procodures. EPA/600/3-88/036 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 210 days after demonstration of tonicity,
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) Request For Relief
The permittee may request relief from further inveRigation 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 PTIlI'[E investigation
end other eppropriste conditions as may Gave bees 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 o(e POTW, pretreatment requirements;
(iii) During the period of the toxicity incident it has properly maintained and operated al] 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~loxicity
could not be located or resolved,
~sDll P .AA]