HYDRO26786

• Permit No: C1981018
• IBM Index Class Name: Hydrology
• Doc Date: 6/5/1995
• Doc Name: RATIONAL FOR PUBLIC NOTICE WESTERN FUELS UTAH INC PN CO-0038024 RIO BLANCO CNTY
• Permit Index Doc Type: NPDES
• Media Type: D
• Archive: No

B. MONI'T'ORING REQUIREMENTS
3. Acute WET Testing-Outfalls 004. 023. 024. 026 and 029 (continued)
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Page ix
Permit No. CO-0038024
If no pa[[em of tonicity is found [he toxicity episode is considered to be ended and routinz tesung is to resume. I( a
pallem of toxicity is found, aPTI/TIE investigation is to be performed. If a pattern of toxicity is not demonstrated
but a significant level of erratic toxicity is found, the Division may require an increased frequency of rouune
monitoring or some other modified approach.
(d) PTI/TIE
The results of the I'fllTlE investigation are to be received by the Division within 120 days of the
and 90 derv tioints of the I'fl/TIE investigation. The Division may extend the time frame fur im~esti_atiun where
reasonable justification exists. A request for an extension must be made in writing end rocerveJ prior to the 120 J:+y
deadline. Such request must include a justification and supporting date for such en extension.
The permi[[ee may use [he 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 reveal causes of such toxicity and appropriate corrective
actions more simply and cos[ effectively than a formal T1E. If the PTI allows resolution of the WET tncident, the
TIE need not necessarily be conducted. If, however, WET is not Identified or resolved during the PTT, the TIE
must be conducted within the allowed 120 day time frame.
Any permittee that is requital to conduct a PTl/TIE investigation shall do so in conformance with pnlceJure.
identified N the following documents, or as subsequently updated: 1) Methods for Aquatic Toxicity Identitcatiun
Evaluations. Phase I Toxicity Characterisation Procedures, EPA/600/6-91/003 Feb. 91 xnd '_) MethuJs Iilr Auuauc
Toxicity Identification Evaluations. Phase II Toxicity Identification Procedures, EPA/600/3-88/035 Feb. 1989.
A third document in this series is Methods for Aquatic Toxicity Identification Evaluations. Phase III Toxicity
Confirmation Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to
confirm that [he suspected toxitant 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 for elimination of the toxicity to acceptable levels.
(e) Request For Relief
The permittee may request relief from further investigation and testing where the toxieam has nut been deternuneJ
and the Division has determined suitable treatment does not appear possible. In reyuesting such relief, the permitter
shall submit material sufficient to establish the following:
(i) I[ has complied with terms and conditions of the permit compliance schedule for the PTI/TIE invesugauun
and other appropriate conditions as may have bezn required by the Division;
(ii) During [he period of the toxicity incident it has been in compliance with all other permit conditions,
including, in [he case of a POTW, pretreatment requirements;
(iii) During the period of the toxicity incident it has properly maintained and operated xll facihues anJ systnm>
of treatment and control; and
(iv) Despite the circumstances described in paragraphs (i) and (iii) above, the source and/ur cause of toxicity
could not be located or resolved.
Amendment No. 1 Issued Effective