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PARTI Permit No. CO-0032638 Page No. 4 A. DEFIMTION OF EFFLUENT LIMITATIONS 1. Efnuent Limitations (continued) b) Outfalls 004 and 007 (continued) Discharge Limitations Maximwn Concentrations Parameter 30-Day Avg. Daily Max. Iron (TR), mg/P a)March-May i)through December 3l, 2002 3.5 7.0 ii)beginning January 1, 2003 2.533 7.0 b)June-February 3.5 7.0 Manganese (PD), mg/f a)March-May 3.5 22.5 b)June-February i)through December 31, 2002 0.55 Report ii)beginning January 1, 2003 0.45 70.8 Mercury (Totaq a)March-May 0.00004 Report b)]une-February O.000II Report Sulfate, mg/C a)March-May Report Report b)June-February i)through December 31, 2002 2,750 Report ii)beginning January 1, 2003 2,610 Report Any discharge or increase in the volume of a discharge caused by precipitation within any 24-hour comply with alternate limitations subject [o burden of proof requirements described in Part I.A.S. I.A.S. for an explanation of when these limitations apply. pertoa may See Pan 2. Whole Effluent Toxicity -Chronic Lethality Limitation for Outfalls 004 and 007 (March - Mav Only) Beginning immediately and lasting through February 28, 2006, there shall be no statistically significant difference in lethality (at the 95% confidence level) between the convol and any effluent concentration less than or equal to 28.6% effluent. Such limitation shall apply as a daily maximum. 3. Whole Effluent Toxicity Testine Requirements (Acute) Outfalls 004 and 007 (June-February Only) a. Testin¢ and Reoonine Requirements Tests shall be done at the frequency listed in Part I.B.1. Test results shall be reported along with the 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 Acute Toxicity Test report form, available from the Division. Copies of these reports are to be submitted to both the Division and EPA along with the DMR. The permittee 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 Or ang isms, 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. The permittee shall conduct an acute 48-hour WET test using 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. See Part I.C. for Definitions.