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LG 162-2 - 2 - * 2 -♦ Part I explains requirements for USTs installed on or after July 1, 2003 and prior to July 1, 2004. These USTs must comply with the requirements outlined in Section 25290.2 of the H&S Code 12. The requirements are presented in question and answer format, listed numerically as Questions 1-10. ♦ Part II explains requirements for USTs installed on or after July 1, 2004 in addition to the applicable requirements of Part I. These USTs must comply with requirements outlined in Section 25290.1 of the H&S Code 3. The additional requirements are presented in question and answer format, listed alphabetically as Questions A-D. 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 ' These requirements became effective on July 7, 2003 with the enactment of Assembly Bill 1702 (Stats. 2 , Ch. 42), an urgency measure. 3 These requirements became effective on January 1, 2003 with the enactment of Assembly Bill 2481 (Stats. 2002, Ch. 999). California Environmental Protection Agency 0 Recycled Paper