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PART I Page No. 5 Permit No. CO-0036595 A. DEFINITION OF EFFLUENT LDvIITATIONS 1. Effluent Limitations (continued) (b) Outfell 004 (continued) Any discharge or increase in volume of a discharge caused by precipitation within any 24-hour period Greater than the 10-vest 24-hour event (or series of storms or snowmelt of equivalent volume) ~ comply with the following litttitations -subject to burden of proof requirements described in Part I.A.3. Effluent Parameter Discharge Limitations 30-Day Ave Daily Max Flow, MGD Report Report Total Suspended Solids, mg/P Repon Report Total Iron, mg/P Report Report Settleable Solids, mP/P N/A Report Oil and Grease, mg/P N/A 10 pH, s.u. (minimum-maximum) N/A 6.5-9.0 Whole Effluent Toxicity, Acute N/A LCD > 100% 2. Acute WET Testine - Out[ell 004 (a) Testine and Reoortine Requirements Tests shall be done at the frequency listed in Part I.B.I. Test resulu shall be reported along with the Discharge ~\ Monitoring Report (DMR) submitted for the reporting period during which the sample was taken. (i.e., WET tes .) results for the first calendar quarter ending Flazch 31 shall be reported with the DMR due April 28.) The results shall be submitted on the Acute Toxicity Test report form, available from the Division. Copies of these reports a. to be submitted to both the Division and EPA along with the DMR. The permittce shall conduct an acute 48-hour WET test'usiflg Ceriodaohnia sp., and an acute 96-hour WET test using fathead minnows. Acute tests will be replacement static tests of a single effluent grab sample. The permute shall conduct each acute WET test in general accordance with methods described in Methods for Measurine the Acute Toxicity of Effluents and Receivine Waters to Freshwater and Marine Oreanisms, EPA/600/4-90/027 or the most current edition, except as modified by the most current Division guidance document entitled Guidelines for Conductive Whole Effluent Toxicity Tests. (b) Failure of Test and Division Notification An acute WET test is failed whenever the LCD, which represents an estimate of the effluent concentration which lethal [0 50~ of the test organisms in the time period prescribed by the test, is found to be less than or equal to 100` effluent. The permittce must provide written notification of the failure of a WET tcst to the Division, alonf with a statement as to whether the Preliminary Toxicity Incident ("PTI")/Toxicity Identification Evaluation ("TIE" investigation or accelerated testing is being perfotvted (sce next section). Notification must be received by the Division within 14 calendar days of the demonstretion of acute WET in the routine required test. "Demonstration" for the purposes of Parts I.A.2.(b),(c),(d) and (f) means na later than the last day of the laboratory test. 1 See Part I.C. for Definitions. IMGV Mwwin 1~. I'/w