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Yart I <br />Page No. 4 <br />Permit No.: CO-0043648 <br />However, verbal notification shall be given to the Division within 24 hours of the occurrence of any dischazge from <br />the Valley Leach Facility that may qualify for the exemption. Then, a report must be submitted within 5 days of the <br />said discharge, documenting that the facility was.maintained to contain the previously specified volumes. The <br />perntittee must also submit documentation of the storm event, including the precipitation gauge station (or the <br />petmittee's own gauge), the volume of runoff produced and the steps taken [o maintain treatment and minimize the <br />amount of overflow. ' <br />All da[a/documen[a[ion required by this section which can not be reported on applicable discharge monitoring report <br />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 any other notification <br />requirements of this permit. <br />d. Storm Exemption From BPJ, Federal Effluent Limitations and Water Oualiry Standard Based Limt[s - Discharee <br />Points 002A, 003A, and 004A <br />If, as a result of precipitation or snowmelt, discharges from any of the above points violate limitations based upon <br />best professional judgement, federal ELG's or water quality standard based limits, [he discharge may qualify for <br />an exemption from such limitations if the following conditions are met: <br />The facility is designed, constructed and maintained to contain the maximum volume of wastewater which <br />would be generated by the facility during a 24-hour period without an increase in volume from precipitation <br />and the maximtun volume of wastewater resulting from a 10-year, 24-hour precipitation event or treat the <br />maximum Flow associated with these volumes. In computing the maximum voltune of wastewater which <br />would result from a 10-year, 24-hour precipitation event, the facility must include the volume which would <br />result from all areas conuibuling runoff [o the individual treatment facility, i.e., all runoff that is not diverted <br />from the active mining area and runoff which is not diverted from the mill area. For the purposes of this <br />permit, the l0-year 24-hour rainfall depth has been determined to be 2.4 inches. <br />iQ The permtttee takes all reasonable steps to maintain treatment of the wastewater and minimize the amount of <br />overflow. <br />iii) All notification requirements of the permit are complied with, including those listed below. <br />If the permittee intends to use the 10-year, 24-hour storm exemption, a report must be submitted within 90 days after <br />the effective date of this pertmt, documenting that the facility is designed, constructed and will be maintained to <br />conlam [he water volumes described above. <br />Also, verbal notification shall be given to the Division within 24 hours of the occurrence of any discharge that may <br />qualify for the exemption. Tlten, a report must be submitted within 5 days of the said discharge, documenting that <br />the facility was maintained to contain the previously specified volumes. The permit[ee must also submit <br />documentation of the storm event, including the precipitation gauge station (or the permiltee's own gauge), the <br />volume of runoft~ produced and the steps taken to maintain treatment and minimize the amount of overflow. <br />All data/documentation required by this section which can not be reported on applicable discharge monitoring report <br />forms (Utvff2s) shall be reported in a letter as an attachment to the D1vfR. Submittal of documentation of <br />containment, maintenance and precipitation records above does not exempt the perntit[ee from any other notification <br />requirements of this permit. <br />