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Part I Page lh of 19 Permit No. CO-0000132 B. MONITORING REQUIREMENTS 7. Phase I THE The Phase I THE performed by the permittee shall be in general accordance with Methods for Aquatic Toxicity Identification Evaluations, Phase I, Toxicity Characteri2ation Procedures (September, pu s y , or n actor ante w t proc ures approved by the Division. If only one species demonstrated toxicity during accelerated testing, then that species alone may be used in the Phase I TRE. The petv~ittee has 45 days from the submission of the final report on the preliminary toxicity investigation to complete the Phase I THE and submit a report to the Division on the results of the study. If the Phase I THE identifies a probable toxicant and/or a probable source of tonicity, the permittee shall submit written notification to that effect to the Division as part of the report. Within 30 days of completing the Phase I TRE, the permittee shall submit for the Division's approval a control program to control WET, and shall proceed to implement such plan within 7 days following approval by the Division. If the Phase I T4E fails to identify a probable toxicant and/or a probable source of toxicity, the permittee shall notify the Division of tts findings. The Division will determine whether a Phase II THE is applicable. If toxicity disappears during the Phase I 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 toxicity is found to eaist, the toxicity incident is closed. 8. Phase II THE If a Phase II THE Ss required, then the following conditions apply: A plan fora Phase II THE shall be submitted to the Division by the pexmittee 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 the 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 p m cesses at the wastewater treatment facility. Source identification and control efforts are designed to identify toxicants, identify the sources of toxicants, and control whole effluent toxicity 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 pe nnittee.