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PART I Page 9 Permit No. CO-0000221 A. TERMS AND CONDITIONS 4. Whn4 F.fflnent Tnxirity Testing RPgtrirementc ( rrdw) _ Mallc nni nnS.~Q(t, nln and nl1 a. Testing and Rr~n9o Req[rirrmrnrc Tests shall be done at the frequency listed in Part I.B.1. Test ruults shall be reporud along with the Dischazge Monitoring Report (DMR) submitted for the reporting period during which the sample was taken. (i.e., WET testing results for the fits[ calendar quarter endittg March 31 shall be reported with the DMR due April 28.) The results shall be submitted on [he Acute Toxicity Test report form, available from the Division. Copies of these reports aze to be submitted to both the Division and EPA along with the DMR. The perminee shall conduc[ an acute 48-hour WET test using Cerindaphnia Dubin. Acute tests will be replacement static tests of a single effluent grab sample. The permittee shall conduct each acute WET test in general accordance with methods described ID Merhndc fnr Mracnring he A ntr Tn:iris of Ffnnrntc and Receiving Watrrc to Frrchwatrr and Marinr ()rg naysmc, EPA/600/4-90/027 or the most currem edition, except as modified by the most currem Division gwdance docutrum emttied (:ntdrlmrc fnr ('nndnrting Whole Ffflnent Tnxiri~ Tsctc, b. Faihve of Trcr and nivicinn Nntifiradnn An acute WET test is failed whenever the I.C~, which represents an estimate of the effluent concentration which is lethal to 50% of the test organisms in the time period prescribed by the test, is found [o be less than or equal to 100% effluent. The perminee must provide Wrinen notification of the failure of a WET test to the Division, along with a statement as to whether the Prcliminaty Toxicity Incident ("PTl")rloxiciry Tdentification Evaluation ("TIE') investigation or accelerated testing is being performed (sec next section). Notification must be received by the Division within 14 calendar days of the demonstration of acute WET in the routine required test. "Demonstration" for the purposes of Parts i.A.4.b., c., • d. and f. means no later than the last day of the laboratory test. C. Anrnmatir (mm~lianre Srhednle 1 jpnn Faihrrn of Tect If a routine acute WET test is failed, the fallowing automatic compliance schedule shall apply. As pan of this the permittte shall either: i. proceed [o conduc[ the PTirl'IE investigation as described in Pan I.A.4.d., or ii. conduct accelerated testing using the single species found m be more sensitive. If accelerated testing is being performed, the pertttittee shall provide written notification of the results within 14 calendar days of completion of the "Pattern of Toxicity"/"No Toxicity" demonstration. Testing will be at least once every two weeks for up to five tests until 1) two consecutive tesa fail or three of five tests fail, in which cast a pattern of toxicity has been demonstrated or, 2) two consecutive tests pass or three of five tests pass, in which case no pattern of toxicity has been found. If no pattern of toxicity is found the toxicity episode is considered to be ended and routine testing is to resume. If a panem of toxicity is found, a PTI/I'fE investigation is to be performed. If a pattern of toxicity is not demonstrated but a significant level of erratic toxicity is found, the Division may require an increased frequency of routine monitoring or some other modified approach. d. 1'~1<TIE The rPC111}C of the PTI/TiF, inawcti$atinn are to he rereived hxshe Divicinn within 12n days of the demonstratmn of arlnP WF'T In the Cn nine }PC}, aC defined ahnVP, nr If arrPlPra}Pd }wefin~iC nPrfnrntPd, the dates the pattern of tnaiei is dPmnnc}ratPd_ A statnc rvnnrt tc to he nrnvidwd to the Divicinn at the iQ~ 6t1 and 9(1 daaTnnintc of thw PTi/TTF. invPC}iga};n"- The Division may euend the time frame for investigation where reasonable justfication exists. A request for an extension must be made in writing and received prior to the 120 day deadline. Such request must include a justification and supporting data for such an extension. Corrected