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• o Single -walled UDC with continuously monitored double -walled piping inside UDC using continuous vacuum , pressure , or hydrostatic monitoring of the double -walled piping ( no single -walled flex connections ) . The double -walled piping must extend all the way to the emergency shutoff impact valve ( shear valve ) . Since the UDC is single walled and a leak can occur from dispenser parts outside the double -walled piping , secondary containment testing must be conducted upon installation and every 3 years thereafter ; OR o Double-walled UDC continuously monitored by using continuous vacuum , pressure , or hydrostatic monitoring of the double -wall . Inside UDC piping can be single walled (e . g . , flex piping , etc . ) . The internal UDC space must have a continuous liquid leak sensor for any piping , fuel filter, or other leaks within the UDC as follows : Liquid sensor which activates an audible and visual alarm display and positive shut down , OR Mechanical float connected to emergency shutoff impact valve ( shear valve ) . o Any leak shall initiate an audible and visual alarm that can immediately be detected by the UST operator , except mechanical float shut off. o Double -walled UDC ' s must be installed with the secondary containment portion as close as possible to the underside of the concrete pad (or higher) , so it reduces a potential pathway for chemicals to enter the backfill . • Automatic Line Leak Detectors ( LLD ' s ) for Pressurized Piping — Provide manufacturer and model of all LLD ' s to be installed . o ALL pressurized piping must have automatic LLD ' s listed in LG 113 and approved by an independent testing organization ( e . g . , UL Listing , etc . ) for its particular use . Must , at a minimum , detect release within 1 hour , equivalent to 3 . 0 gph at 10 psi , with > 95 % probability of detection and < 5 % probability of false alarm . There are 2 types of LLD ' s , mechanical and electronic . LLD ' s must be tested every year . o Manual Line Leak Detectors ( MLLD ' s ) : ■ Must be able to respond to simulated 3 . 0 gph leak annually ; AND ■ Must be able to restrict liquid flow , but not shut down pump , if it detects a leak . o Electronic Line Leak Detectors ( ELLD ' s ) : ■ Normally connected to ATG control panels ; AND ■ Can be programmed to respond to simulated 0 . 2 gph leak monthly ; AND ■ Can be programmed to respond to simulated 0 . 1 gph leak annually ; AND ■ Must automatically shut off turbine pump if: • Leak is detected ; AND • Any portion of monitoring system is disabled or disconnected ; AND • Any portion of monitoring system malfunctions or fails a test . • Automatic Line Leak Detector Certification for Pressurized Piping — • o Date of certification . o Software version installed . ( 888 ) 239 - 9988 SAN DIEGO LOS ANGELES PHOENIX westernpump . com Page 9 of 11