Agenda - 10-14-1993 - D 1 attch - Laserfiche WebLink

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7. Monitoring Requirements - Vehicle Maintenance Activities. Stormwater discharges from any vehicle maintenance activity occurring on-site which uses more than 55 gallons of new motor oil per month when averaged over the calendar year shall be monitored by the permittee as specified below: Stormwater Discharge Units Monitoring- Requirements Characteristics_ Measurement Sample Sample Freguencvt IYRQ Location Total Flow3 MG 3/term SDO Oil and Grease mg/I 3 1term Grab SDO Lead, Total Recoverable4 ug/I 3 1term Grab SDO Detergents (MBAS)5 mg/I 3/term Grab SDO pH Standard 3/term Grab SDO New motor oil usage gallons/month 3/term Estimate a Measurement Frequency - 3/term - shall mean Stormwater runoff associated with vehicle maintenance activity on-site. Existing facilities shall be sampled once within six months of certificate of coverage issuance and, where possible, prior to implementing BMPs and development of the BMP Plan ,p at existing operations. Thereafter, sampling shall be conducted two times during the remaining permit term at intervals of greater than eighteen o months apart and collected during the months of April through November. 2 Sample Locations: SDO - Stormwater Discharge Outfall ro to 3 Total flow shall be measured continuously or calculated based on the amount of area draining to the outfall, the amount of built-upon area, and the total N amount of rainfall or estimated by the measurement of the flow at 20 minute intervals during the rainfall event. Total precipitation and duration of the event measured shall be a representative storm event. 4 Applies only for facilities at which fueling occurs. 5Detergent monitoring is required only at facilities which conduct vehicle cleaning operations. ro M Storm Event Units Monitoring Requirements Qharacteristic rt Total Event Precipitation inches 3/term Event Duration hours 3/term •° H n^ Ul O N O O O 0