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PARTI Page No. 7 PemutNo.: CO-0038342 1£ deemed appropriate by the Division, the permit or the compliance schedule maybe modified to revise the ongoing monitoring and toxicity investigation requirements to avoid an unproductive expenditure of the pe~ittee's resources, provided that the underlying obligation to eliminate any continuing exceedance of the toxicity limit shall remain. £ Spontaneous Disappearance If toxicity spontaneously disappears at anytime after a test failure, the permittee shall notify the Division in writing within 14 days of a demonstration of disappearance of the toxicity. The Division may require the pemuttee to develop and submit additional information, which may include, but is not limited to, the results of additional testing. If no pattern of toxicity is identified or recurring toxicity is not identified, the toxicity incident response is considered closed and normal WET testing shall resume. g. Tonicity Reopener This permit maybe reopened and modified (following proper administrative procedures) to include new compliance dates, additional or modified numerical permit limitations, a new or different compliance schedule, a change in the whole effluent toxicity testing protocol, or any other conditions related to the control of toxicants if one or more of the following events occur: i. Toxicity has been demonstrated in the effluent and the pemrit does not contain a toxicity limitation. ii. The PTUTIE results indicate that the identified toxicant(s) represent pollutant(s) that maybe controlled with specific numerical limits and the permit issuing authority agrees that the control of such toxicants through numerical Limits is the most appropriate course of action. iii. The PTUTIE reveals other unique conditions or characteristics, which, in the opinion of the pemvt issuing authority, justify the incorporation of unanticipated special conditions in the permit. ~VIONITORING REQUII2EMENTS 1. Frequency and Sample Tvpe In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part LA.1, the pemrittee shall monitor all effluent parameters at the following frequencies. Such monitoring will begin irrmrediately and last for the life of the permit unless otherwise noted. The results of such monitoring shall be reported on the Discharge Monitoring Report form (See Part I.E.) a. Outfa11001 Parameter Flow, MUD Total Suspended Solids (TSS), mg!1 pH, s.u. (minimum-maximum) Oil and Grease, mg/l Total Dissolved Solids, mg/1 Settleable Solids, mUl Total Iron, ug/1 Freguencv Sample Tvpe Once per week Instantaneous or Continuous Gnce per month Grab Once per week In-situ Once per week Visual Once per quarter Grab Once per month Grab Once per month Grab See Part I.C. for Defiaifions. A!I)perHP.dac Revised 06/09/04