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Part I Page li of 19 ' Permit No. CO-0032115 B. MONITORING REQUIREMENTS 8. Preliminary Toxicity Investigation (Cont.) If the preliminary toxicity investigation identifies a probable toxicant and/or a probable source of toxicity, the permittee shall submit, as part of its final report results, written notification to that effect to the Division. Within 30 days of completing the preliminary toxicity investigation, the permittee shall submit for the ':°~.: Division's approval a control program to control effluent toxicity, ~=.°~' and shall proceed to implement such plan within 7 days following approval by the Division. v;_.' ., ,q If no probable explanation for toxicity is identified in the 15-day .~;,~. ; preliminary toxicity investigation, a Phase I Toxicity Reduction Evaluation (TRE) is required. The permittee shall notify the •:w Division, as part of its final report, of its intent [o proceed with ~~.~ the Phase I TRE. If toxicity disappears during the preliminary toxicity investigation, 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. l If no acute toxicity is found to exist, the toxicity incident is / closed. 9. 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 Characterization Proce ures (September, 1 pu is ed y EPA, or in accordance wit procedures approved by the Division. If only one species demonstrated tonicity during accelerated testing, then that species alone may be used in the Phase I TRE. The permittee has 45 days from the submission of the final report on the preliminary toxicity investigation to complete the Phase I THE aad 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 toxicity, 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 THE fails to identify a probable toxicant and/or a probable source of toxicity, the permittee shall notify the Division 1 of its findings. The Division will determine whether a Phase II THE J is applicable.