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LG 162-2 - 2 - PART 2 - PART I: USTs INSTALLED ON OR AFTER JULY 1, 2003 AND PRIOR TO JULY 1, 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 0, Recycled Paper