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LG -161-2 .-2- May 15, 2003
<br />♦ Is subject to the notification requirements for wells found to have contaminants in
<br />excess of maximum contaminant levels or action levels established by DHS. [Health
<br />& Saf. Code, § 25299.97, subd. (a)(1)]
<br />What is the deadline for performing ELD and how often does ELD have to be performed
<br />on a subject UST system?
<br />For UST systems with a single -walled component, ELD must be performed no later than 18
<br />months following receipt of notification from the SWRCB and be repeated every thirty-six (36)
<br />months thereafter. [Cal. Code Regs., tit. 23, § 2644. 1, subd. (a) (3)]
<br />• What is a single -walled component? A single -walled component is any part of a UST
<br />system that is constructed with walls made of only one thickness of material.
<br />Laminated, coated, or clad materials are all considered single -walled. [Health & Saf.
<br />Code, § 25281, subd. (r)] Tanks that were lined to meet the 1998 upgrade requirements
<br />are also considered to be single -walled. UST systems with any of the following
<br />components are considered "single -walled": a single -walled tank, single -walled
<br />pressurized piping, single -walled conventional suction piping, a dispenser without
<br />under -dispenser containment, or a turbine that is not contained in a sump. However,
<br />single -walled vent or tank riser piping, vapor recovery piping, and "safe" or "European"
<br />suction piping are not considered single -walled components of UST systems if they
<br />meet the definition of section 2636 (a)(1), (2), or (3). [Cal. Code Regs., tit. 23, § 2640,
<br />subd. (e)(1)] UST systems with a single -walled component were typically installed on
<br />or before January 1, 1984, although some may have been installed between January 1,
<br />1984 and July 1, 1987.
<br />For UST systems that do not have a single -walled component (i.e., UST systems with secondary
<br />containment), ELD must be performed once by January 1, 2005. [Health & Saf. Code, §
<br />25292.5, subd. (a)]
<br />• What is an UST system with secondary containment? An UST system with
<br />secondary containment has a second containment around all regulated single -walled
<br />components. An UST system with secondary containment at a minimum includes all of
<br />the following: a double -walled tank, double -walled piping (unless piping is "safe" or
<br />"European" suction), a turbine containment sump, and under -dispenser containment.
<br />UST systems that meet the criteria of secondary containment were typically installed
<br />after July 1, 1987, although some may have been installed between January 1, 1984 and
<br />July 1, 1987.
<br />ELD means a test method that ascertains the integrity of an UST system. Therefore, regardless
<br />of the UST system type (i.e., single -walled, double -walled, or hybrid 3), the entire UST system
<br />(single -walled and double -walled) must be tested to fulfill the requirement.
<br />What is the process for implementing ELD?
<br />As described below, several groups are responsible for various aspects of the process for ELD
<br />implementation.
<br />3 A hybrid UST system refers to a UST system comprised of both single -walled and double -walled components.
<br />Because they contain a single -walled component, hybrid UST systems that are subject to ELD must be tested within
<br />. 18 months of notification and every three years thereafter, unless all regulated single -walled components are
<br />upgraded to double -walled. [Cal. Code Regs., tit. 23, § 2644.1, subd. (a)(1)]
<br />California Environmental Protection Agency
<br />Recycled Paper
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