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P:~R r 1 Pag~ I1 Permit No CO-00(70221 • A. TER,~IS ,\ND CONDITIONS 4. Whole Fftlnent Toxicity Testing Requirements (Acute) - Outfalls D03. 003, 005, 1106 Olfl 01 L 01? 013, 014, 016 and IIU (continued) Toxicity Regpener This permit may be reopened and modified (fallowing proper administrative procedures] to include new compliance dates, additional or modified numencal 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 [o.xicants if one or more of the (ollowing events occur: I. Toxicity has been demonstrated in the effluent and the perm[[ does not contain a toxicity limitation. ii. The PTI/TIE results indicate that the toxicant (s) represent pollutant(s) that may be controlled with specific numerical limits, and the Division agrees that the numerical controls are the most appropriate course of action. iii. The PTI/TIE reveals other unique condittons or characteristics which, in the opinion of the Drvision, justify the incorporation of unanticipated special condittons in the permit. 5. Whole Effluent Tonicity Testing Requirements fChronicl - Outfalls 004 and 008 Testing and Reporting Requirements Tests shall be done a[ the fregpencv listed in Part l.B.l. Test results shall be reported on [he Discharge Monitoring Report (DMR) submitted for the reporting period during which the sample was taken. (i.e., WET testing results for the first calendar quarter ending March 31 shall be reported with the DMR due April 28.) The results • shall be submitted on the Chronic Tonicity Test report form, available from the Division. Copies of these reports are to be submitted to the Division along with the DMR. The permittee shall conduct each chronic WET test in general accordance with methods described Shnn Term tvlethods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to Freshwater Organisms, EPA/600!4-89/001 or the most current edition, except as modified by the most current Division guidance document entitled Guidelines for Conducting Whole Effluent Toxicity Tests. The permittee shall conduct such tests using Ceriodaphnia dubia and fathead minnows. b. Failure o(Test and Division Notification Beginning on the effective date of the limitation, a chronic WET test is Failed whenever [here is a statistically significant difference in lethality between the control and any effluent concentration less than or equal to the instream waste concentration ("IWC"). The seasonal IWCs for outfalls 004 and 008 are shown in Pan LA. Lf. The permittee must provide written notification of the failure of a WET test to the Division, along with a statement as to whether a Preliminary Toxicity Investigation ('PTI")/Toxtciry Identification Evaluation ("TIE") or accelerated testing is being performed. Notification must be received by the Division within 21 calendar days of the demonstration of chronic WET in the routine required [est. "Demonstration" for the purposes of Pans I.A.~.b., c., d. and f. means no later than the last day of [he laboratory test. Automatic Comoltance Schedule Upon Failure of Test If a routine chronic WET test is (titled, the (ollowing automatic compliance schedule shall apply. As part of this the permutee shall either. 1. proceed io conduct the PTI/TIE investieaiion as described m Pan [..4.S.d, or . ii. conduct accelerated testing using the suiele species found to be more sensitive. Amendment No. I Issued S~ P ? f? if1(1(~r Corrected 7/25/97 t. 7 IJ3 Effective t`Z-?`. „ 1 ~~f;• J ~L1 V~ -TJj~-