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LG 162-2 - 7 - 8 7 -8 H&S Code §25290.2 H&S Code §25290.1 A. In accordance with H&S Code, Section 25290.1(e), which components of USTs installed on or after July 1, 2004 must be continuously monitored using vacuum, pressure, or interstitial liquid level measurement methods? The interstitial space of the tank and product piping (including fill, vent, and vapor recovery piping), that are beneath the surface of the ground must be maintained under constant vacuum or pressure. Statute also requires that a breach in the primary or secondary containment be detected before the liquid or vapor of the stored substance is released to the environment. Continuous vacuum, pressure, or interstitial liquid level measurement methods can be used to satisfy these requirements. As with all leak detection equipment used to monitor the UST system, these methods must be third-party certified and should be listed in Local Guidance (LG) Letter 113. LG 113 can be found on our website at: http://www.waterboards.ca.gov/ust/leak prevention/I013/index.html It is important to note that regulated piping begins where piping exits/enters the tank and continues to the point where piping extends above the surface of the ground (e.g., at a shear valve). Statute does not provide an exemption for singlewalled piping transitions contained in sumps, or single-walled piping transitions in UDCs, or fill piping contained in sumps. The following options may be used to satisfy the requirements for single-walled piping transitions contained in sumps; single-walled piping transitions contained in UDCs; and fill piping contained in sumps: i. The entire piping length, including piping within sumps or UDCs, must be double-walled and continuously monitored using vacuum, pressure, or interstitial liquid level measurement methods; or ii. The interstitial space between the primary (i.e., single-walled transition pipe or fill piping) and secondary containment (i.e., sump, UDC) must be continuously monitored using vacuum or pressure. (Note: Interstitial liquid level measurement would not be appropriate for this option.); or iii. The single-walled transition pipe or fill piping must be contained within a double-walled sump and/or double-walled UDC that either: (1) extends to the surface or (2) has a double-walled product tight lid that is continuously monitored using vacuum, pressure, or interstitial liquid level measurement methods. The secondary containment (of the sump or UDC, including penetration fittings) must be continuously monitored using vacuum, pressure, or interstitial liquid level measurement methods. California Ca Recycled Paper Environmental Protection Agency