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Part I <br />Page lh of 19 <br />Permit No. CO-0036595 <br />B. MONITORING REQUIREMENTS <br />7. Phase I TRE <br />The Phase I TRE performed by the permittee shall be in general <br />accordance with Methods for Aquatic Toxicity Identification <br />Evaluations, Phase I, Toxicity Characterization Procedures (September, <br />1988) published by EPA, or in accordance with procedures approved by <br />the Division. If only one species demonstrated toxicity during <br />accelerated testing, then that species alone may be used in the Phase <br />I TRE. The permittee has 45 days from the submission of the final <br />report on the preliminary toxicity investigation to complete the Phase <br />I TRE and submit a report to the Division on [he results of the study. <br />If the Phase I TRE identifies a probable toxicant and/or a probable <br />source of toxicity, the permittee shall submit written notification to <br />Chat effect to the Division as part of the report. Within 30 days of <br />completing the Phase I TRE, the permittee shall submit for the <br />Division's approval a control program to control WET, and shall <br />proceed to implement such plan within 7 days following approval by the <br />Division. <br />-' If the Phase I TRE fails to identify a probable toxicant and/or a <br />~'. probable source of toxicity, the permittee shall notify the Division <br />of its findings. The Division will determine whether a Phase II TRE <br />is applicable. <br />If toxicity disappears during the Phase I TRE, the permittee shall <br />submit written notification to that effect to the Division. The <br />Division may require the permittee to conduct accelerated testing to <br />demonstrate the continued absence of toxicity. If no acute toxicity <br />is found to exist, the toxicity incident is closed. <br />8. Phase II TRE <br />If a_Phase II TRE is required, then the following conditions apply: <br />A plan Eor a Phase II TRE shall be submitted to the Division by the <br />permittee within 60 days of notification from the Division that a <br />phase II TRE will be required. The Phase II TRE, as submitted to or <br />revised by the Division, shall be incorporated into the permit. <br />The Phase II TRE plan shall include the scope, methods, procedures, <br />reporting requirements, and schedules. A Phase II TRE may follow <br />either of two directions, as appropriate: toxicant treatability <br />studies, or source identification and control studies. Toxicant <br />treatability studies are designed to assess the feasibility of <br />eliminating WET via addition or modification of treatment processes at <br />the wastewater treatment facility. <br />Revised 3/9/90 <br />