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LG 162-2 - 6 - 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/Ig113/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 single- walled 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 . Pursuant to Section 2637 ( a ) (6) of Title 23 , CCR , portions of the UST system which are continuously monitored using vacuum , pressure , or interstitial liquid level measurement methods are exempt from periodic secondary containment testing . Therefore , periodic secondary containment testing is not required for secondary containment of tank and piping that are continuously monitored using vacuum , pressure , or interstitial liquid level measurement methods . Please note that annual certification of the leak detection equipment is still required . Be What components of USTs installed on or after July 1 , 2004 are required to be monitored in accordance with H &S Code , Section 25290 . 1 ( d ) ? Section 25290 . 1 requires that the " underground storage tank system " be designed and constructed with a continuous monitoring system . Tank and product piping monitored using constant vacuum , pressure , or interstitial liquid level measurement methods satisfy this requirement through Section 25290 . 1 (e ) . However, other parts of the UST system not subject to Section 25290 . 1 (e ) must California Environmental Protection Agency Qa Recycled Paper