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U1 TEST Questions & answers with Complete solution
U1 TEST Questions & answers with Complete solution
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U1 TESTObservation 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
, When a bottom hold down pad is used beneath a steel tank, the thickness of the
bedding material can be reduced to _____ inches. - ANS-6 inches
Pressure imposed on tanks should not exceed _____ psi. - ANS-5 psi
Overfill alarms must be set at ______% of tank capacity. - ANS-90%
The maximum burial depth for Fiberglass tanks is _____ feet. - ANS-7 feet
Five factors that aggravate excavations are: - ANS-1. Ground and surface water
2. Unstable soil
3. Backfill areas
4. Frost
5. Product and Vibrations
Slope of an excavation is determined by what 4 factors? - ANS-1. Soil Conditions
2. Depth
3. Shoring requirements
4. Safety
True or False: A tank shipped with a liquid filled interstice need not be subjected to the
pre-installation air/soap test. - ANS-True
True or False: You should pressurize the interstice with air from the inner tank. -
ANS-True
Pressure testing a tank should be monitored for how long? - ANS-1 hour
True or False: Pressurizing the interstice with air pressure from the inner tank, after
disconnecting the outside source, prevents over-pressurization. - ANS-True
True or False: It is standard practice to lower galvanic anodes by the lead wire. -
ANS-False
Paving over tanks in traffic areas should extend at least _____ inches beyond the
perimeter of the tank. - ANS-12 inches or 1 foot
Regarding tanks: In areas subject to vehicle traffic. At least ____ inches of backfill and
_____ inches of asphalt must be used. - ANS-30 and 6
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