U1 TEST Exam Questions with 100% Correct Answers

Observation wells are installed _____the excavation, while monitoring wells are installed _______the excavation. Correct Answer Inside, Outside After piping areas are backfilled, _______psi air pressure may be maintained in the piping, provided no product has been in the piping. Correct Answer 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. Correct Answer 6, 18 T or F - Flexible connectors may be used for non-metallic or metallic piping. Correct Answer True What must be used on all pressurized piping systems to detect leaks? Correct Answer PLLD (Pressurized Line Leak Detector) Test new piping at _____psi for a period of ____minutes, soaping all joints. Correct Answer 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. Correct Answer 60% True of False: Couplings provided to protect pipe threads may be used underground, provided they are at least 18 inches below grade. Correct Answer 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. Correct Answer 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. Correct Answer 45 degree At least _____ feet of backfill is required between tanks and between the tank and excavation walls. Correct Answer 2 feet To provide a firm foundation, a tank should be set on a bed of backfill material at least _____ foot thick. Correct Answer One foot