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.~ , • Part I Page lh of 19 Permit No. CO-0042562 B. MONITORING REQUIREMENTS 8. Phase II THE (continued) If toxicity disappears during the Phase II TRE, the permittee shall submit written notification to that effect to the Division. The Division may require the permittee to conduct accelerated testing to demonstrate the continued absence of toxicity. If, after completigg any Division directed accelerated teating, no acute toxicity is found to exist, the permittee shall resume normal quarterly testing. 9. Control Program If required pursuant to Part I.B. of this permit, the permittee shall develop a control program to eliminate WET, through the identification and elimination of any toxicants or toxicant sources responsible for WET, or through the identification and implementation of toxicant treatability processes. The control program, along with any cost/benefit analysis to determine whether the costs of construction bear a reasonable relationship to the resulting benefits, shall be submitted within the specified time frames. Such cost benefit analysis shall be used in accordance with Section 25-8-503(8) and (9), C.R.S. The control program, as submitted to or revised by the Division, may be incorporated into the permit. A control program may include, but shall not be limited to: additional pretreatment requirements imposed on specific indirect permittees by POTW's, modification of internal source control programs by industries, modifications of treatment plants, and/or best management practices for spills, leaks, etc. 10. Toxicity Incident Closure If WET is controlled through implementation of numeric limits for specific toxicants, through a control program eliminating toxicants from the waste stream, or through the implementation of treatment processes, or if WET disappears and Division required accelerated testing demonstrates the continued absence of toxicity, the toxicity incident response shall be considered closed and normal quarterly monitoring shall resume. If the permittee completes all required phases of the toxicity incident response specified in compliance schedules, and is unable either to identify the causative toxicants and their sources or to identify feasible treatment options, the permittee may petition the Division for relief from further investigation and testing, consistent with the permit regulations.