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LG 162-2 2 PART I : USTs INSTALLED ON OR AFTER JULY 1 , 2003 AND PRIOR TO JULY 11 2004 . 1 . What does " product tight" mean? For UST systems installed before July 1 , 2003 , "product tight' is defined to mean impervious to the (liquid ) substance that is contained , so as to prevent seepage of the substance stored . [H &S Code §25281 (0) ] However, for UST systems installed on or after July 1 , 2003 , statute defines the term "product tight' to mean " impervious to the liquid and vapor of the substance that is contained , or is to be contained , so as to prevent seepage of the substance from the containment." [H &S Code §25290 .2 (a) . ] UST owners and operators may install UST systems approved in accordance with Sections 2631 (b) and (d ) , Title 23 , California Code of Regulations (CCR) , as applicable . If at any point in time the State Water Resources Control Board (State Water Board) staff determine that an existing component or testing standard is deficient , the manufacturer of the equipment or testing organization will be informed and asked to resolve any concerns or deficiencies . 2. How can sumps and under-dispenser containment ( UDC ) connected to USTs installed on or after July 1 , 2003 meet the product tight requirement? UST systems installed on or after July 1 , 2003 must be designed and installed such that there are no pathways for liquids or vapors to enter the backfill . For sumps , the "product tight' requirement may be satisfied by installing and maintaining sumps which have barriers that extend to grade level or covers , such that there is a product tight barrier between the sump containment and the backfill . For UDCs , the "product tight' requirement may be satisfied through the use of containment structures that extend to grade level such that there is a product tight barrier between the UDC and the backfill . Sump and UDC penetration (entry) fittings must also be product tight. Furthermore , sumps and UDCs must be properly installed , operated , and maintained to provide protection against the entry of liquids and vapors into the backfill . 3. For USTs installed on or after July 1 , 2003 , can secondary containment be open to rainfall or water intrusion ? No . All secondary containment components must be installed to prevent water intrusion into the system by precipitation , infiltration , or surface runoff. [H &S Code , §25290 . 2 (c) (3) .] The primary function of this requirement is to keep water out of the containment areas (e . g . , tanks , piping , sumps , UDC) so that, in the event of a release , the stored substance can be detected and contained until it is cleaned up . In response to the detection of water into these containment areas , the owner or operator must remove and properly dispose of such water, identify the source(s) , and correct the problem to prevent further water intrusion . The owner or operator should not make any modifications to the UST system that would nullify or void manufacturer warranties or independent testing organization approvals . California Environmental Protection Agency pia RecydedPaper