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- 2 - ■ Is subject to the notification requirements for wells found to have contaminants in excess of maximum contaminant levels or action levels established by DHS. [Health & Saf. Code, § 25299.97, subd. (a)(1)] What is the deadline for performing ELD and how often does ELD have to be performed on a subject UST system? For UST systems with a single-walled component, ELD must be performed no later than 18 months following receipt of notification from the SWRCB and be repeated every thirty-six (36) months thereafter. [Cal. Code Regs., Title 23, § 2644.1, subd. (a) (3)] • What is a single-walled component? A single-walled component is any part of a UST system that is constructed with walls made of only one thickness of material. Laminated, coated, or clad materials are all considered single-walled. [Health & Saf. Code, § 25281, subd. (r)] Tanks that were lined to meet the 1998 upgrade requirements are also considered to be single-walled. UST systems with any of the following components are considered "single-walled": a single-walled tank, single-walled pressurized piping, single-walled conventional suction piping, a dispenser without under-dispenser containment, or a turbine that is not contained in a sump. However, single-walled vent or tank riser piping, vapor recovery piping, and "safe" or "European" suction piping are not considered single-walled components of UST systems if they meet the definition of section 2636 (a)(1), (2), or (3). [Cal. Code Regs., Title 23, § 2640, subd. (e)(1)] UST systems with a single-walled component were typically installed on or before January 1, 1984, although some may have been installed between January 1, 1984 and July 1, 1987. For UST systems with secondary containment that were installed before July 1, 2003 and are located within 1,000 feet of a public drinking water well, one-time ELD testing is required. [Health & Saf. Code, §25292.5, subd. (a)]. • What is an UST system with secondary containment? An UST system with secondary containment has a second containment around all regulated single- walled components. An UST system with secondary containment at a minimum includes all of the following: a double-walled tank, double-walled piping (unless piping is "safe" or."European" suction), a turbine containment sump, and under- dispenser containment. UST systems that meet the criteria of secondary containment were typically installed after July 1, 1987, although some may have been installed between January 1, 1984 and July 1, 1987. In addition, Health and Safety Code, §25289, subdivision (b) authorizes the State Water Board to require ELD testing when the SWRCB finds that the burden of the testing, including costs, bears a reasonable relationship to the need for the testing and reporting. The SWRCB finds that the burden of imposing required ELD testing of USTs located within 1000 feet of a public drinking water well on owners or operators not previously notified under other sections of the Health and Safety Code bears a reasonable relationship to the benefits to be gained from obtaining information about tank integrity. Information about tank integrity is needed so that leaking USTs can be identified. Therefore, owners/operators of UST systems not previously notified under California Environmental Protection Agency 0 Recycled Paper