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Sta'�e Water resources <br /> Control Blyd <br /> Division of Water Quality <br /> 1401 I Street-Sacramento,California 95814-(916)341-5775 ' <br /> Linda S.Adams Mailing Address:P.O.Box 2231-Sacramento,California-95812 Arnold Schwarzenegger <br /> 3ecretaryfor FAX(916)341-5808-http://www.waterboards.ca.gov Governor <br /> Environmental protection <br /> December 21, 2007 <br /> To: Underground Storage Tank (UST) Local Regulatory Agencies and Interested <br /> Parties <br /> CLARIFICATION OF EXISTING REGULATIONS FOR UNDER-DISPENSER <br /> CONTAINMENT <br /> It has come to our attention that there have been instances of incorrect application of <br /> under-dispenser containment (UDC)' regulations when owners or operators are <br /> installing or replacing dispensers. When a larger dispenser is placed over a smaller <br /> UDC there exists the strong possibility that piping within the dispenser no longer falls <br /> within the footprint of the UDC. The UDC acts as the secondary containment for piping <br /> (including all product piping, metering devices, valves, and appurtenances within the <br /> dispenser housing), which is intended to contain and prevent leaks from entering the <br /> soil and reaching groundwater. Dispenser piping that does not fall entirely over the <br /> footprint of the UDC is not secondarily contained and in the instance of a leak can result <br /> in a release to the environment. <br /> If the piping within the dispenser extends beyond the footprint of the UDC, two options <br /> exist: <br /> 1. Replace the existing UDC with a new UDC, that encompasses the entire <br /> dimensions of the dispenser, or <br /> 2. Install a State Water Board approved under-dispenser spill containment or <br /> control system that will direct leaks from all dispenser piping into the existing <br /> UDC. <br /> The installation of an under-dispenser spill containment or control system will ensure <br /> that in the occurrence of a leak, the release is directed to the UDC. In accordance with <br /> section 2636(g)(3)(A-C), the manufacturer of an under-dispenser spill containment or <br /> 1 Under-dispenser containment is defined as secondary containment that is located under a dispenser(California <br /> Code of Regulations,Title 23, section 2611). <br /> 2 A dispenser is defined as an aboveground or underground device that is used for the delivery of a hazardous <br /> substance from an underground storage tank. Dispenser includes metering and delivery devices,and fabricated <br /> assemblies located therein(California Code of Regulations,Title 23,section 2611). <br /> 3 An under-dispenser spill containment or control system is defined as a device that is capable of preventing an <br /> unauthorized release from under the dispenser from entering the soil and/or groundwater(California Code of <br /> Regulations,Title 23, section 2611). <br /> California Environmental Protection Agency <br /> Recycled Paper <br />