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PART I Page lj of 19 Permit No. OD-0032115 B. M1NI70RII+IG RP)QIIIRF14~N1S 4. Acute WEf Testing-Outfalls 002. 005. 009. 011. 013. 015 and 016 (continued) (e) R^auest For Relief lcontirued) (iii) During the period of the toxicity incident it has properly maintai.r~ed and operated all facilities and systems of treamient and control; and (iv) Despite the circ~mstarroa described iii paragraphs (i) gild (iii) above, the source ardor rs+++ce of toxicity could riot be located or resolved. If deemed appropriate by the Division, the permit or the coapl3arY:e sclied<ile may be modified to revise the anBo~6 monitoring and toxicity imiestigatian requirements to avid an unproductive expenditure of the pennittee's resources, provided that the underlying obligation to eliminate arty contirering exceederoe of the toxicity limit shall remain. (f) Spontaneous Disapceararoe If toxicity spanrA.am+~ly disappears at any time after a test failure, the permittee shall ratify the Division in writing within 14 days of a demonstration of disappearance of the toxicity. The Division may require the permittee to develop and submit additional information which may include, but is not limited to, the results of additional testing. If ro pattern of toxicity is identified or recurring toxicity is rot identified, the toxicity incident response is considered closed abe roxmal WE1' testing shall resume. (g) Toxicity Reeoener This permit may be reopened and modified (following proper administrative procedures) to include new coapliance dates, additional or modified n~erical permit limitations, anew or different canpliance schedule, a change in the whole effluent toxicity testing protocol, or any other conditions related to the control of toxicants if ore or more of the following events occur: (i) Toxicity has been demonstrated in the effluent and the permit does not contain a toxicity limitation. (ii) The P1Z/1TE results indicate that the toxicant (s) represent pollutant(s) that may be controlled with specific ramierical limits, and the Division agrees that the~r¢urerical controls are the most appropriate course of action. (iii) The PTI/fIE reveals other unique conditions or characteristics which, in the opinion of the Division, justify the incorporation of unanticipated special conditions in the permit. C. DEFINII'IOtS OF TERIS 1. "Acute Whole Effluent Toxicity" exists whenever the LCD, which represents an estivate of the effluent concentration which is lethal to SOX of the test organisers in the time period prescribed by the test, is found to be less than or equal to 100X effluent. 2. "Composite" sample is a minimvn of four (4) grab samples collected at equally spaced two (2) hour intervals and proportioned according to flow. AmenLient 2 Issued 03/15/94 Effective 05/01/94 Amerdnent 3 Issued Effective