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PART I <br />Page x <br />Permit No. CO-0000213 <br />B. MOMTORING REQUIREMENTS <br />3. Acute WET Testinn-Outfalls 001 and 007 (continued) <br />The permittee may use We lime for investigation to conduct a PTI or move directly into the TIE. A PTI consists of <br />a brief search for possible sourcxs of WET, which might reveal causes of such toxicity and appropriate corrxtive <br />actions more simply end cost effectively than a formal T1E. If the PTI allows resolution of the WET incident, the <br />TIE aced not necessarily be conducted. If, however, WET is not identified or resolved during the PTT, the'['[E <br />must be conducted within the allowed 120 day time frame. <br />Any permittee that is required [o conduct a PTI/I-IE investigation shall do so in conformance with procedures <br />identified in the following documents, or as subsequently updated: 1) Methods for Aquatic Toxicity identification <br />Evaluations. Phase f Toxicity Characterisation Procedures. EPA/600/tiAl/003 Feb. 91 and 2) Methods for Aquatic <br />Toxicity Identification Evaluations. Phase R Toxicity identification Procedures. EPA/600/3-88/035 Feb. 1989. <br />A third document in this series is Methods for Aquatic Toxicity identification Evaluations, Phase IiI Toxicity <br />Confirmation Procedures, EPA/600/3-88/036 Feb. 1989. As indicated by the title, this procedure is intended to <br />confirm that the suspected toxicant is truly the toxicant. This investigation is optioml. <br />Wilhia 90 days of the determination of the toxicant or no later than 210 days aker demonstration of toxicity, <br />whichever is sooner, a control program is to be developed and received by the Division. The program shall set <br />down a method and procedure for elimination of the toxicity to acceptable levels. <br />(e) Request For Relief <br />The permittee may request relief from further investigation and testing where the toxicant has not been determined <br />end Ote Division has determined suitable treatment does no[ appear possible. In requesting such relief, the permittee <br />shall submit material sufficient to establish the following: <br />(i) It has complied with terms and conditions of the permit compliance schedule for the PTIlI'IE investigation <br />and other appropriate conditions as may have been required by the Division; <br />(ii) During the period of the toxicity incident it has been in compliance with all other permit conditions, <br />including, in the rase of a POTW, pretreatment requirements; <br />(iii) During the period of the toxicity incident it has properly maintained and operated all facilities end systems <br />of treatment and control; and <br />(iv) Despite the circumstances described in paragraphs (i) and (iii) above, the source and/or cause of toxicity <br />could not be located or resolved. <br />If deemed appropriate by the Division, the permit or the compliance schedule may be modified to revise the ongoing <br />monitoring and toxicity investigation requirements to avoid m unproductive expenditure of dte permittee's resources, <br />provided that the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain. <br />(f) Spontaneous Disappearance <br />If toxicity spontaneously disappears el any time after a test failure, the permittee shall notify the Division in writing <br />within 14 days of a demonstration of disappearance of the toxicity. The Division may require dte permittee to <br />develop and submit additional information which may include, but is not limited to, the results of additional testing. <br />If no pattern of toxicity is identified or recumng toxicity is not identified, the toxicity incident response is <br />considered closed and normal WET testing shall resume. <br />woes dror9a <br />