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PART I Page if of 19 Permit No. C0-0040827 B. MONITORING REQUIREMENTS 3. Storm Exemption - 001, 003, 004, 005, 007, 008 (Cont.) (b) The maximum volume of wastewater resulting from a 10=year, 24-hour precipitation event, including the volume which would result from all areas contributing runoff to the individual treatment facility (i.e., all runoff not diverted from the active mining area or the mill area). In addition, if discharge occurs as a result of the 10-year, 24-hour storm volume being exceeded and the permittee wishes to claim an exemption from technology based effluent limitations, the permittee shall submit, within 5 days of the said discharge, documentation that the facilities were maintained to contain or treat the previously specified volumes. The permittee must also submit documentation of the storm event, including the precipitation recorded at the closest official precipitation gauge station (or the permittee's own gauge), the volume of storm runoff produced and the steps taken to maintain treatment and minimize the amount of overflow. All data/documentation required by this section which can not be reported on applicable discharge monitoring report forms (DME`s) shall be reported in letter form as as attachment to the DMR. Submittal of documentation of containment, maintenance and precipitation records above does not exempt the permittee from the notification requirements of PART II.A.3. of this permit. 4. Frequency and Sample Type - Acute WET Testing - 002 The monitoring frequency for acute WET tests shall be quarterly, commencing with the first full calendar quarter following the permit effective date. Quarterly test results shall be reported along with the Discharge Monitoring Report (DMR) submitted for the end of the reporting calendar quarter (i.e., WET testing results for the calendar quarter ending t4arcli 31 shall be reported with the DMR due April 28, with the remaining WET testing reports submitted with DMRs due each July 28, October 28 and January 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. The permittee shall conduct each acute WET test in general accordance with methods described in the Division guidance document entitled Guideli~ies for Conducting Whole Effluent Toxicity Tests. The permittee shall conduct an acute 8-hour WET test using Ceriodaphnia sp., and an acute 96-hour WET test using fathead minnows. Acute tests will be replacement static tests of a single effluent grab sample.