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PART I <br />Page iv <br />Permit No. CO-0043648 <br />b. Annual Precipitation Exemption From 'No Discharge' Limitation - Discharge Point 007A <br />In the event that the annual precipitatiop falling on the Valley leach Facility end the drainage area contributing <br />surface runoff to the leaching facility exceeds the annual evaporation, a volume of water equal to the difference <br />between annual precipitation falling on the facility and the drainage area contributing surface runoff [o the <br />facility end atmual evaporation may be discharged subject to the limitations set forth in Table I.A.-1. Verbal <br />notification shall be given within 24 hours, and written notification shall be submitted to Ute Division within 5 <br />days of the discovery of any discharge from the Valley Leach Facility that may qualify for this exemption. <br />c. Storm Exemption From "No Discharge' Limitation -Discharge Point 007A <br />If any discharge from the Valley Leach Facility occurs as a result of the 10-year, 24-how storm volume being <br />exceeded, that discharge will be subject to the limitations set forth in Table I.A.-1, unless, for water quality <br />standard based limits, the permittce demonstrates that instream pollutant concentrations did not exceed the <br />corresponding stream standards. <br />Verbal notification shall be given to the Division within 24 hours of the discovery of any discharge from [he <br />Valley Leach Facility [hat may qualify for this exemption. Additionally, if the permittce intends to use [he 10- <br />year, 24-hour storm exemption from technology based efFluent limitations provided in 40 CFR Part 440, <br />Subpart L, a report must be submitted within 90 days after the effective date of this permit, documenting that <br />the facility is designed, constructed and will be maintained to contain: <br />a) The maximum volume of wastewater which would be generated by the facility during a 24-hour period <br />without an increase ta volume from precipitation; and <br />b) The maximum volume of wastewater resulting from a 10-year, 24-hour precipitation event, including the <br />volume which would result from all areas contributing runoff [o the "zero discharge" area or process (i.e., <br />all runoff not diverted from the area or process subject to the zero discharge). <br />Also, if discharge occurs as a result of the 10-year, 24-hour storm volume being exceeded and the permittee <br />wishes to claim the exemption from technology based efFluent limitations, the permittce shall submit, within 5 <br />days of [he said discharge, documentation that [he facility was maintained [o contain the previously specified <br />volume. The permittee must also submit documentation of the storm event, including the precipitation gauge <br />station (or the permittce's own gauge), the volume of runoff produced and the steps taken [o maintain treatment <br />and minimize the amount of overflow. <br />All data/documentauon required by this section which can not be reported on applicable discharge monitoring <br />report forms (DMRs) shall be reported in a letter as an attachment to the DMR. Submittal of documentation of <br />containment, maintenance and precipitation records above does not exempt the permittee from the standard <br />notification requirements of the permit. <br />d. Limits for Spuific Discharge Points In addition to the limits listed in the following tables, the "No Discharge" <br />limitation described in section VI.A.I.a. applies [o all potential discharges that may be tributary to the discharge <br />points listed. This may require, in addition to maintaining compliance with the pumeric limits shown, <br />demonstration that there has been no statistical increase in ins[ream pollutant concentrations or loads. This is <br />discussed in more detail in the monitoring conditions sections of both the rationale and the permit. <br />INDBV aNAI <br />