U1 Test Questions All Answered

U1 TEST QUESTIONS ALL ANSWERED Observation wells are installed _____the excavation, while monitoring wells are installed _______the excavation. - ANS Inside, Outside After piping areas are backfilled, _______psi air pressure may be maintained in the piping, provided no product has been in the piping. - ANS 10 psi In traffic areas, ensure that the trench is sufficiently deep to permit _______inches of bedding and at least _____ inches of compacted backfill above piping. - ANS 6, 18 T or F - Flexible connectors may be used for non-metallic or metallic piping. - ANS True What must be used on all pressurized piping systems to detect leaks? - ANS PLLD (Pressurized Line Leak Detector) Test new piping at _____psi for a period of ____minutes, soaping all joints. - ANS 50 psi, 60 minutes (1 hour) When sand is used: Sand is backfilled in 12 to 18 inch lifts and compacted after each lift. This needs to continue to a level that is _____% of the tanks height. - ANS 60% True of False: Couplings provided to protect pipe threads may be used underground, provided they are at least 18 inches below grade. - ANS False. Couplings furnished to protect pipe threads are disposable, and not to be used. True or False: Placement of the UST directly on the hold-down pad may be acceptable, depending on the manufacturer's specifications. - ANS False: Placement of the the tank directly on the hold down pad is never permitted. The _____degree factor should be used to avoid undermining nearby structures. - ANS 45 degree At least _____ feet of backfill is required between tanks and between the tank and excavation walls. - ANS 2 feet To provide a firm foundation, a tank should be set on a bed of backfill material at least _____ foot thick. - ANS One foot