Ordinance No. 19593 - Laserfiche WebLink

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4. Containment, When required in Sections 80.302 through 80.3I5, drains shall be directed to a containment system or ether location designed as secondary containment for the hazardous material liquids and fire protection water; or the building, room or area shall be designed to provide secondary containment of hazardous material liquids and fire protection water through the use of recessed floors or liquid- tight raised sills. EXCEPTION: The provisions of this subsection may be waived when the chief or other official charged with the enforcement of this code has determined that such enforcement is pre-empted by other codes, statutes, or ordinances. See Section 8o.I41. A. Secondary containment shall be designed to retain the spill from the largest single container or 10% of the total volume of all containers, whichever is greater, plus the design f1 ow rate of the automatic fire extin- guishing system for the area of the room or area in which the storage is located or the system design area, which- ever is smaller. The containment capacity shall be capable of containing the flow fora period of 24 minutes. Emergency drainage systems, if connected to sewer systems, or discharged into waterways or onto land surfaces, shall be equipped with traps or separators sufficient to pre- vent the release of hazardous materials and fire suppres- sion run-off. B. Sumps, traps, tanks yr collection areas used to contain released hazardous materials and/or fire suppres- sion run-off shall be provided with a readily accessible means of pumping such materials from the collection system in order to prevent or reduce overflow. Overflow from the secondary containment system shall be provided to direct liquid leakage and fire protection water to a safe location away from the building, any important valve, means of egress, fire access roadway, adjoining property yr storm drains. C, If the storage area is open to rainfall, the secondary containment shall be designed to accomodate the volume of a twenty-four X24} hour rainfall as deter- mined by the twenty-five X25} year storm. When curbs are used, provisions shall be made for draining accumu- lations of groundwater or rainwater. D. When secondary containment is required, a moni- toring method capable of detecting hazardous material leakage from the primary containment into the secondary containment shall be provided. Visual inspection of the primary containment is the preferred method; however, other means of monitoring may be approved by the chief. Where secondary containment may be subject to the intru- sion of water, a monitoring method for such water shall be provided. Whenever monitoring devices are provided, they shall be connected to distinct visual and/or audible alarms . ordinance - 28