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` ~ PAR•I <br />Page lh of 19 <br />Permit No. CO-0043168 <br />B. MONITORING REQUIREMENTS <br />10. ]'oxicity Incident Closure <br />If WET is controlled through implementation of numeric limits for <br />specific toxicants, thzough a control program eliminating toxicants <br />]From the waste stream, or through the implementation of treatment <br />processes, or if WET disappears and Division required accelerated <br />testing demonstrate the continued absence of toxicity, the toxicity <br />:incident response shall be considered closed and normally quarterly <br />monitoring shall resume. <br />[f the permittee completes all required phases of the toxicity incident <br />'response specified in compliance schedules, and is unable either to <br />identify the causative toxicants and their sources or to identify <br />feasible treatment options, the permittee may petition the Division for <br />relief from further investigation and testing, consistent with the <br />permit regulations. <br />11. Preeuency and Sample Type - Chronic WET Testinv_ <br />The monitoring frequency for chronic toxicity tests shall be once every <br />six months on a January - June, July - December sequence, and cannot <br />coincide with acute testing. Chronic tests will be static replacement <br />tests using three composite e_'fluen[ samples, each of which is to be <br />composited for a minimum of eight hours. Chronic testing will br <br />conducted with both Ceriodaohnia. sp. and fathead minnows durino, the <br />first year. During years two and three, if req~:ested in writing by the <br />permittee, the Division may grant relief from continued two species <br />testing. Such relief shall be for continued testing with only that <br />species which has demonstrated the greatest sensitivity during the <br />first year of testing. The results shall be submitted on the Chronic <br />Toxicity Test report form, available from the Division. Copies of <br />these reports are to be submitted to both the Division and EPA. <br />The permittee shall conduct each chronic toxicity test in general <br />accordance with methods described in the Division guidance document <br />entitled Guidelines for Conducting Whole Effluent Toxicity Tests. <br />As general information, chronic toxicity occurs when there is a <br />statistically significant difference in survival, growth or <br />reproduction for either species. <br />Doc 1003M: Revised 12-30-91 <br />