|
LG-161-2 -2- May 1.5,2003
<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 S WRCB 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 /> a 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 A.-ency
<br /> t Recycled Paper
<br />
|