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4 <br />H. MONITORING REQUIREMENTS <br />9. Toxicity Incident Closure (Continued) <br />• Part I <br />Page li of 19 <br />Permit No.: CO-0032751 <br />If the permittee completes all required phases of the toxicity incident <br />specified in compliance schedules, and ie unable either to identify the <br />causative toxicants and their sources or to identify feasible treatment <br />options, the permittee may petition the Division for relief from further <br />investigation and testing, consistent with the permit regulations. <br />If the permittee completes all required phases of the toxicity incident <br />specified in compliance schedules, and ie unable either to identify the <br />causative toxicants and their sources or to identify feasible treatment <br />options, the permittee may petition the Division for relief from furthex• <br />investigation and testing, consistent with the permit regulations. <br />10. Freouencv and Sample Tme - Chronic WET Testino <br />In the event of a discharge from outfall 001, the monitoring frequency <br />for chronic toxicity teats shall be once every six months on a January -• <br />June, July - December sequence, and cannot coincide with acute testing. <br />The first such test must be completed and reported on the June DIiR due <br />July 28, 1991. Chronic teats wi1.L be static replacement teats using <br />three composite effluent samples, each of which is to be compoaited for <br />a minimum of eight hours. Chronic testing will be conducted with both <br />Ceriodaohnia sp. and fathead minnows during the first year. During <br />years two and three of WET testing, if requested 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 hoe demonstrated the greatest sensitivit during the first <br />year of testing. The results eha:Ll be submitted on the Chronic Toxicity <br />Test report form, available from the Division. Copies of these reports <br />are to be submitted to both the D.vision and EPA. <br />After a total of three years of reported WET monitoring data, the <br />chronic testing requirements will no longer be required unless <br />applicable regulations require inclusion of a chronic toxicity limit. <br />The permittee shall conduct each :hronic toxicity test in general <br />accordance with methods described in the Division guidance document <br />entitled Guidelines for Conductino Whole Effluent Toxicity Tests. <br />As general information, chronic toxicity occurs when there is a <br />etatieticalLy significant difference in survival, growth, or <br />reproduction for either species. <br />Revised 5/2/89 <br />DOC 1003M <br />