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SWRCB JUNE 2008 <br /> Monitorins Re uirements of Double-walled Piping Installed On or After Jul 1, 2004 <br /> M 20 111 <br /> • The entire piping length, including piping • The interstitial space between the primary • The single-walled transition pipe or <br /> within sumps or UDC's, must be monitored containment(i.e., single-walled transition pipe or fill fill piping must be contained within a <br /> using vacuum, pressure, or interstitial liquid piping) and secondary containment (i.e., sump or double-walled sump and/or double- <br /> level measurement methods; UDC) must be continuously monitored using walled UDC that either: extends to the <br /> vacuum or pressure; surface, or has a double-walled <br /> AND product tight lid that is continuously <br /> • Sumps and UDC's require sensors AND monitored using vacuum, pressure, or <br /> capable of detecting liquid and vapor • No sensors in sumps and UDC's required; interstitial liquid level measurement <br /> releases from the primary containment; methods; <br /> AND <br /> AND • 3.0 gph LLD for pressurized piping. AND <br /> • 3.0 gph LLD for pressurized piping. • Sumps and UDC's required to have <br /> sensors that are capable of detecting <br /> liquid releases; <br /> AND <br /> • 3.0 gph LLD for pressurized piping. <br /> HSC 25290.1 HSC 25290.1 HSC 25290.1 <br /> Enhanced Leak Detection ELD Testing <br /> IT el <br /> 09 <br /> pgy <br /> " M r.- <br /> Y <br /> Enhanced leak detection testing must be Must conduct testing every three years. Must conduct a one-time test. <br /> conducted if notified by the State Water <br /> Resources Control Board, and are located <br /> within 1000 feet of a public drinking water <br /> well. <br /> Page 7 of 7 <br />