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I I I <br />State Water Resources i 1 Board <br />Linda S. Adams Division of Water Quality <br />Secretaryfor 10011 Street, Sacramento, California 95814® (916) 341-5870 <br />Environmental Protection Mailing Address: P.O. Box 100, Sacramento, California 95812-0100 <br />FAx (916) 341-5463 ♦ Internet Address: http://www.waterboards.ca.gov <br />August 25, 2006 <br />0 <br />Arnold Schwarzenegger <br />Governor <br />To: Underground Storage Tank (UST) Local Regulatory Agencies and Interested <br />Parties <br />California Code of Regulations, Title 23, section 2631, subdivision (b) requires that the <br />design and construction of tanks and piping be approved by an independent testing <br />organization in accordance with industry codes, voluntary consensus standards, or <br />engineering standards. For piping, this requirement is typically met through obtaining <br />listing from Underwriters Laboratories Inc. (UL) by successful completion of testing <br />performed in accordance with UL 971: Standard for Nonmetallic Underground Piping for <br />Flammable Liquids. <br />UL 971 was revised in 2004, and all piping manufactured after July 1, 2005 must meet <br />the revised version of the standard in order to bear the UL marking.' The UL 971 <br />standard includes different test procedures depending on the intended use of the piping <br />being tested. For example, piping intended for use with a closed interstitial space will <br />be tested with higher pressure on the secondary containment than if the piping were <br />intended for use with an open interstitial space. Other application-specific test <br />procedures can be followed depending on which products will be stored in the system <br />and which monitoring methods (vacuum, pressure, or liquid) will be used to monitor the <br />piping. <br />Because there are numerous test procedures within UL 971, it is important to verify that <br />piping has been tested for the application in which it will be used. The attached "Matrix <br />of Pipe Monitoring Applications" can be used to assist with identification of piping that <br />complies with the independent testing requirements of California Code of Regulations, <br />Title 23, section 2631(b). <br />The Matrix of Pipe Monitoring Applications is based on information provided by the <br />listed pipe manufacturers and reviewed by the State Water Board's UST Program staff. <br />These manufacturers have had a chance to review and comment on the matrix. It will <br />' Refer to the State Water Board's 8/31/2005 Advisory Regarding Thermoplastic Flexible Piping for additional <br />information. ( http://www.waterboards.ca.gov/ust/leak_prevention/docs/ca_advisory_re_tfp.pdf ) <br />California Environmental Protection Agency <br />(5 Recycled Paper <br />