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PART <br />Page No. 12 <br />Permit No.: CO- 0038024 <br />If the permittee intends to use the 10 -year, 24 -hour storm exemption, a report must be submitted to the Division within 90 <br />• days after the effective date of this permit, documenting that the facility is designed, constructed and will be maintained to <br />contain: <br />a. The maximum volume of wastewater which would be generated by the facility during a 24 -hour period without an <br />increase in volume from precipitation; and <br />b. The maximum volume of wastewater resulting from a 10 -year, 24 -hour precipitation event, including the volume which <br />would result from all areas contributing runoff to the "zero discharge" area or process (i.e., all runoff not diverted from <br />the area or process subject to the zero discharge). <br />In addition, if discharge occurs as a result of the 10 -year, 24 -hour storm volume being exceeded and the permittee wishes to <br />claim an exemption from technology based effluent limitations, the permittee shall submit, within 5 days of the said discharge, <br />documentation that the facility was maintained to contain the previously specified volume. The permittee must also submit <br />documentation of the storm event, including the precipitation gauge station (or the permittee's own gauge), the volume of <br />runoff produced and the steps taken to maintain treatment and minimize the amount of overflow. <br />For claiming a storm water exemption, the permittee must also adequately demonstrate that all reasonable management, <br />containment, and treatment options have been optimally utilized. <br />The storm event exemptions are only applicable for the following parameters at this facility, which are based upon Federal <br />BAT /BPT limitations: total suspended solids, settleable solids <br />All data/documentation required by this section which can not be reported on applicable discharge monitoring report forms <br />(DMRs) shall be reported in a letter as an attachment to the DMR. Submittal of documentation of containment, maintenance <br />and precipitation records above does not exempt the permittee from the notification requirements of Part II.A.* of this permit. <br />• MONITORING REQUIREMENTS <br />1. Frequency and Sample Type <br />In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part <br />I.A.1, the permittee shall monitor all effluent parameters at the following frequencies. Such monitoring will begin <br />immediately and last for the life of the permit unless otherwise noted. The results of such monitoring shall be reported on the <br />Discharge Monitoring Report form (See Part I.E.) <br />Zonitormg Requirements for Outfall 001 <br />Paramete Measurement Frequ ency Sample Type <br />Flow, MGD Monthly Instantaneous <br />TSS, mg/1 Quarterly Grab <br />Total Iron, mg/1 Quarterly Grab <br />Settleable Solids, ml/1 Quarterly Grab <br />Oil and.Grease, mg/1 Quarterly Visual <br />pH, s.u... Monthly, .: In -situ _ <br />TDS, mg/1 Quarterly Grab <br />Monitoring Requirements for Outfall 004 <br />Parameter Measurement Frequency Sample Type <br />