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PART I Page lg of 19 Permit No. CO-00002: B. MONITORING REQUIREMENTS 3. Storm Exemption - 009, 010 If the permittee intends to use the 10-year, 24-hour storm exemption, a report must be submitted within 90 days after the effective date of this permit, documenting that the facility is designed, constructed and will be maintained to contain or treat: (a) The maximum volume of wastewater which would be generated by the facility during a 24-hour period without an increase in volume from precipitation; and (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). Zn 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 cf overflow. All data/documentation required by this section which can not be reported on applicable discharge monitorLng report forms (DMR's) shall be reported in letter form as an attachment to the UMR. 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 Tvoe - Acute WET Testing - 002, 003. 004, 005. 006. 008 Quarterly test results shall be reported along with the Discharge Monitoring Aeport (DMR) submitted for the end of~the reporting calendar quarter (i.e., WET testing results for the calendar quarter ending March 31 shall be reported with the DMR due April 28, with the remaining WET testing reports submitted with DMRa due each July 28, October 28 and January 28). The results shall be eubmitted 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 teat in general accordance with methods described in the Division guidance document entitled Guidelines for Conducting Whole Effluent Toxicity Tests, unless the Division has granted permission for the permittee to use a modification of same. The permittee shall conduct an acute 48-hour WET test using Ceriodaphnia sp., and an acute 96-hour wET teat using fathead minnows. Acute tests will be replacement static tests of a single effluent grab sample.