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LG 162-2 - 8 - <br /> Pursuant <br /> 8 -Pursuant to Section 2637(a)(6) of Title 23, CCR, portions of the UST system <br /> which are continuously monitored using vacuum, pressure, or interstitial liquid <br /> level measurement methods are exempt from periodic secondary containment <br /> testing. Therefore, periodic secondary containment testing is not required for <br /> secondary containment of tank and piping that are continuously monitored using <br /> vacuum, pressure, or interstitial liquid level measurement methods. Please note <br /> that annual certification of the leak detection equipment is still required. <br /> B. What components of USTs installed on or after July 1, 2004 are required to <br /> be monitored in accordance with H&S Code, Section 25290.1(d)? <br /> Section 25290.1 requires that the "underground storage tank system" be <br /> designed and constructed with a continuous monitoring system. Tank and <br /> product piping monitored using constant vacuum, pressure, or interstitial liquid <br /> level measurement methods satisfy this requirement through Section 25290.1(e). <br /> However, other parts of the UST system not subject to Section 25290.1(e) must <br /> satisfy the monitoring requirement in Section 25290.1(d). These components <br /> include, but are not limited to, riser piping and access points on top of the tank, <br /> which provide access to the primary containment of the tank and may be in <br /> contact with vapors of the stored product. <br /> The requirement for sumps and UDCs to have sensors is as follows. Sumps and <br /> UDCs installed and monitored in accordance with paragraph A.i, above, must <br /> have sensors that are capable of detecting liquid and vapor releases from the <br /> primary containment. No sensors are required for sumps and UDCs installed and <br /> monitored in accordance with paragraph A.ii, above. Sumps and UDCs installed <br /> and monitored in accordance with paragraph A.iii, above, are only required to <br /> have sensors that are capable of detecting liquid releases. <br /> C. For UST components monitored continuously using vacuum, pressure, or <br /> interstitial liquid level measurement methods, is additional testing or <br /> evaluation necessary? <br /> If the component's current listing includes approval for its use with continuous <br /> monitoring using vacuum, pressure, or interstitial liquid level measurement <br /> methods, no further testing or evaluation is necessary. However, if the <br /> component's current listing does not include approval of its use with continuous <br /> monitoring using vacuum, pressure, or interstitial liquid level measurements, <br /> additional testing or evaluation may be necessary. Owners and operators should <br /> ensure that UST components are approved for use with a continuous monitoring <br /> system using pressure, vacuum, or interstitial liquid level measurement methods <br /> consistent with the requirements outlined in Sections 2631 (b) and (d), Title 23, <br /> CCR, as applicable. <br /> California Ca Recycled Paper Environmental <br /> Protection Agency <br />