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• PART I Page lh of 19 Permit No. CO-0000213 B. MONITORING REQUIREMENTS (Continued) 6. Phase II THE If a Phase II THE is required, then the following conditions apply: A plan for a Phase II THE shall be submitted to the Division by the permittee within 60 days of notification from the Division that a Phase II THE will be required. The Phase II TRE, as submitted to or revised by [he Division, shall be incorporated into the permit. The Phase II THE plan shall include the scope, methods, procedures, reporting requirements, and schedules. A Phase II THE may follow either of two directions, as appropriate: toxicant treatability studies, or source identification and control studies. Toxicant treatability studies are designed to assess the feasibility of eliminating WET via addition or modification of treatment processes at the wastewater treatment facility. Source identification and control efforts are designed to identify toxicants, identify the sources of toxicants, and control whole effluent to~city by eliminating the introduction of toxicants into the wastewater treatment facility. The Phase II THE permit conditions may • be amended, if so requested and justified by the permittee. The Phase II THE report shall indicate the results of the Phase II THE study. If the Phase II THE results in the identification of the toxicants and the sources of toxicants, the permittee shall submit for Division approval a control program to control WET within 60 days of discovering the cause(s) of effluent tonicity, and shall proceed to implement such plan within 7 days following its approval by the Division. If tonicity 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 no acute tonicity is found to exist, the tonicity incident is closed. 7. Control Program If required pursuant to Parts 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 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 coat 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. Revised S/2/89