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• art I Page lj of 19 Permit No.: CO-0032751 H. MONITORING REQUIREMENTS il. Storm Exemption - Facilities Permitted to Diaeharae If the permittee intends to use the 10-year, 24-hour storm exemption (which may be applicabl• for Total Suspended Solids), a report moat be submitted within 90 days after the effective date of this permit, documenting that the facility is designed, constructed and will be maintained to contain or treat: 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 re~~ult from all areas contributing runoff to the individual trsatmen~: facility (i. •., all runoff not diverted from the active mining area or the mill area). In addition, if discharge occurs as a result of the 10-year; 24-hour storm volume being exceeded and the permittee wishes to cla:un an exemption from technology based effluent limitations, the pc~rmittee shall submit, within 5 day of the said discharge, documant::tion that the faeilitiea were maintained to contain or treat the previ.ovely specified volumes. The permittee must also submit documentation of the storm event, including the precipitation recorded at the closest official precipitation gauge et at ion (or the permittee'e owri 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 forme (DNIR'e) shall be reported in letter form as an attactuoent to the DHR. Submittal of documentation of containment, maintenance and precipitation records above dose not exempt the permittee from the notification requirements of PART II A.3 of this permit. Revised 5/2/89: Doc 1003M