2008-09-19_PERMIT FILE - C1981018A (2)

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PART II Page No. 11 Pemut No.: CO-0038024 • 4. Storm Exemption -Facilities Not Permitted to Discharge If the pernuttee intends to use the 10-year, 24-hour storm exemption, a report must be submitted to the Division within 90 days after the effective date of this permit, documenting that the facility is designed, constructed and will be maintained to contain: 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 "zero discharge" area or process (i.e., all runoff not diverted from the area or process subject to the zero discharge). 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 facility was maintained to contain the previously specified volume. The percnittee must also submit documentation of the storm event, including the precipitation gauge station (or the pernuttee's own gauge), the volume of runoff produced and the steps taken to maintain treatment and minimize the amount of overflow. For claiming a storm water exemption, the pernuttee must also adequately demonstrate that all reasonable management, containment, and treatment options have been optimally utilized. The storm event exemptions are only applicable for the following parameters at this facility, which are based upon Federal BATBPT limitations: total suspended solids, settleable solids All data/documentation required by this section which can not be reported on applicable discharge monitoring report forms • (DMRs) shall be reported in a letter as an attachment to the DMR. Submittal of documentation of containment, maintenance and precipitation records above does not exempt the pernuttee from the notification requirements of Part II.A.* of this permit. B. MONITORING REQUIREMENTS 1. Frequency and Sample Tvpe In order to obtain an indication of the probable compliance or noncompliance with the effluent limitations specified in Part I.A.1, the permittee shall monitor all effluent parameters at the following frequencies. Such monitoring will begin immediately and last for the life of the permit unless otherwise noted. The results of such monitoring shall be reported on the Discharge Monitoring Report form (See Part I.E.) Monitoring Requirements for Outfall 001 Parameter Measurement Frequency Sample Type Flow, MGD Monthly Instantaneous TSS, mg/1 Quarterly Grab Total Iron, mg/1 Quarterly Grab Settleable Solids, mUl Quarterly Grab Oil and Grease, mg/1 Quarterly Visual pH, s.u. Monthly In-situ . TDS, mg/1 Quarterly Grab