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PART I Page if of 19 Permit No. CO-0000132 B. MONITORING REQUIREMENTS 3. Storm Exemption - Discharge points 003, 004, 005, 006, 007, 009 and 1 Cont. In addition, if discharge occurs as a result of the 10-year, 24-hour storm vole being exceeded and the permittee wishes to clalm 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 (DNB's) shall be reported in letter form as an attachment to the DMR. Submittal of documentation of containment, malntenance and precipitation records above does not exempt the permittee from the notification requirements of Part II.A.3 of tt•Ss permit. 4. Frequency and Sample Type - Acute WET Testing - Discharge point 011 The monitoring frequency for acute WET tests shall be quarterly, commencing with the first full calendar quarter followigg 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 (1. e., WET testing results for the calendar quarter ending March 31 shall be reported with the DMR due April 28, with the remaining WEf testing reports submitted with DMRs due each Jule 28, October 28 and January 28). The results shall be submitted on t:he 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 Guidelines for Conducting Whole Effluent Toxicity Tests. The permittee shall conduct an acute 48-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.