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o All double -walled piping shall have continuous monitoring of the secondary containment using continuous vacuum , pressure , or hydrostatic monitoring of the double -wall annular space as follows : Product conveying piping ( continuous vacuum or pressure ) . Vent piping ; (continuous vacuum , pressure , or hydrostatic ) ; Vapor recovery piping ; (continuous vacuum , pressure , or hydrostatic) . o Any leak shall initiate an audible and visual alarm that can immediately be detected by the UST operator . o For pressurized piping , the monitoring system shall shut down the turbine pump if a leak is detected or if the monitoring system fails . • UST Sump Monitoring for Piping , Riser, and Man -ways — Provide documentation that the UST sumps will be continuously monitored by one of the following methods : o For single -walled sumps with single walled piping inside sumps ( e . g . , flex piping , fill piping , all riser piping , etc . ) . The interior sump space shall be continuously monitored for pipe joint leaks by using continuous vacuum or pressure . o For single -walled sumps with continuously monitored double -walled piping inside sumps using continuous vacuum , pressure , or hydrostatic monitoring of the double - walled piping (e . g . , NO single -walled flex connections , fill piping , or riser piping ) . o for double -walled sumps continuously monitored by using continuous vacuum , pressure , or hydrostatic monitoring of the double -wall , the inside sump piping can be single walled ( e . g . , flex piping ; fill piping , all riser piping , etc . ) . The internal sump space must have continuous liquid leak sensors to detect any piping leaks . o Sumps must be installed on all UST riser piping and manways (e . g . , fill pipes , tank openings , automatic tank gauging , etc . ) . o A leak shall initiate an audible and visual alarm that can immediately be detected by the UST operator. o For pressurized piping , the monitoring system shall shut down the turbine pump if a leak is detected or if the monitoring systems fail . o All sumps must have water-tight lids . o Double -walled sumps 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 . • UST Under Dispenser Containment ( UDC ) Monitoring — Provide documentation that the UDC will be continuously monitored by one of the following methods : ( 888 ) 239 -9988 SAN DIEGO LOS ANGELES PHOENIX westernpump . com Page 8 of 11