U1 UST Installation/Retrofitting
U1 UST INSTALLATION/RETROFITTING NEWEST 2025 COMPLETE
150 QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
observation wells locates I the tank excavation and monitoring wells installed in native soil
outside the tank excavation. may be used for leak detection only if? - ANSWER-the water table
is within 20' of the ground surface all times of the year.
construct wells of factory slotted PVC or coated metallic pipe with 0.020-inch openings and
allow water or released product to flow freely into the well. - ANSWER-observation well must be
1 t0 2' below the bottom of the tank. monitoring well must be 5' below water table to a
maximum of 5'.
schedule 40 factory wrapped coated steel pipe is the minimum standard for metallic product
piping. - ANSWER-if u ions are installed under ground they should be 250/300 ground joint
onions and provide access to service.
install fill pipe so the top of fill ca pl will be? - ANSWER-4 to 6" below the manhole lid.
air test new single wall or double wall piping at? - ANSWER-50 psig
It test primary coaxle piping at? - ANSWER-50 psig for 1 hour.
for fiberglass secondary piping initial testing, test at? - ANSWER-10 psig, if flexible connectors
are used test at 5 psig.
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, U1 UST Installation/Retrofitting
dialetric coatings isolate the external surfaces of thank and piping from the environment and
reduce current demand on the catholic protection. coatings may be? - ANSWER-coal tar foxes,
enamels, fiberglass reinforced plastic or urethane in liquid form, tape or extrusions.
connect the rectifier negative terminal to the structure and positive terminal to the anodes. -
ANSWER-Install on a dedicated electrical circuit.
ball float vent valves will not work when? - ANSWER-when coaxle stage 1 vapor recovery
systems are installed.
vacuume assist stage 2 vapor recovery is recommended for above ground storage systems
unless? - ANSWER-the distance between vehicle tank and storage tank is a short distance.
stage 2 vapor recovery may include a liquid removal? - ANSWER-if the hose extends more then
10" downward from the fuel inlet to the nozzle when hung on the dispenser.
vapor valves must be located in? - ANSWER-a nozzle, in the dispenser cabinet or on the vapor/
liquid splitter fitting.
a ball valve may be installed in the vapor piping above? - ANSWER-the vapor shear valve so the
vapor handling components and hanging hardware can be isolated from the underground vapor
piping
shear valves must be anchored to both? - ANSWER-didpensor island and the framework
vapor risers beneath dispensers are constructed of? - ANSWER-1" diameter pipe
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, U1 UST Installation/Retrofitting
size of vapor recovery piping is typically - ANSWER-2 to 3" in diameter between dispensers.
when performing a pre installation pressure test of a double wall tank pressure up the? -
ANSWER-inner tank to 5 psig for 1 hour soaping all components then pressure the interstice
with air from the inner tank and soap all components. first release pressure from interstice then
the inner tank.
when a bottom hold down pad is used under a steel tank. - ANSWER-the bedding material may
be reduced to 6"
cover in areas that are subject to vehicle traffic - ANSWER-30" compacted backfill and 6" of
asphaltic concrete, or 18" of compacted backfill and 6 to 8" of reinforced concrete. paving over
tanks in traffic areas should extend 1 foot beyond tank perimeter.
cover in non traffic areas should be atleast 2' thick and consist of a minimum of 1' of backfill
covered by filter fabric and a minimum of 1' earth. - ANSWER-an acceptable alternative is 1'
backfill material and atleast 4" of reinforced concrete or 6" of asphalt paving.
the maximum burial depth for fiberglass tanks - ANSWER-7'
the burial depth for steel tanks is? - ANSWER-5'
to provide a firm foundation set tanks on atleast....... of backfill - ANSWER-1' thick that extends
1' beyond ends and sides of tank.
how many feet of backfill is required between adjacent tanks and tanks and excavation wals? -
ANSWER-2'
excavation material must be stockpiled atleased..... from tank - ANSWER-2'
3|Page
U1 UST INSTALLATION/RETROFITTING NEWEST 2025 COMPLETE
150 QUESTIONS AND CORRECT ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
observation wells locates I the tank excavation and monitoring wells installed in native soil
outside the tank excavation. may be used for leak detection only if? - ANSWER-the water table
is within 20' of the ground surface all times of the year.
construct wells of factory slotted PVC or coated metallic pipe with 0.020-inch openings and
allow water or released product to flow freely into the well. - ANSWER-observation well must be
1 t0 2' below the bottom of the tank. monitoring well must be 5' below water table to a
maximum of 5'.
schedule 40 factory wrapped coated steel pipe is the minimum standard for metallic product
piping. - ANSWER-if u ions are installed under ground they should be 250/300 ground joint
onions and provide access to service.
install fill pipe so the top of fill ca pl will be? - ANSWER-4 to 6" below the manhole lid.
air test new single wall or double wall piping at? - ANSWER-50 psig
It test primary coaxle piping at? - ANSWER-50 psig for 1 hour.
for fiberglass secondary piping initial testing, test at? - ANSWER-10 psig, if flexible connectors
are used test at 5 psig.
1|Page
, U1 UST Installation/Retrofitting
dialetric coatings isolate the external surfaces of thank and piping from the environment and
reduce current demand on the catholic protection. coatings may be? - ANSWER-coal tar foxes,
enamels, fiberglass reinforced plastic or urethane in liquid form, tape or extrusions.
connect the rectifier negative terminal to the structure and positive terminal to the anodes. -
ANSWER-Install on a dedicated electrical circuit.
ball float vent valves will not work when? - ANSWER-when coaxle stage 1 vapor recovery
systems are installed.
vacuume assist stage 2 vapor recovery is recommended for above ground storage systems
unless? - ANSWER-the distance between vehicle tank and storage tank is a short distance.
stage 2 vapor recovery may include a liquid removal? - ANSWER-if the hose extends more then
10" downward from the fuel inlet to the nozzle when hung on the dispenser.
vapor valves must be located in? - ANSWER-a nozzle, in the dispenser cabinet or on the vapor/
liquid splitter fitting.
a ball valve may be installed in the vapor piping above? - ANSWER-the vapor shear valve so the
vapor handling components and hanging hardware can be isolated from the underground vapor
piping
shear valves must be anchored to both? - ANSWER-didpensor island and the framework
vapor risers beneath dispensers are constructed of? - ANSWER-1" diameter pipe
2|Page
, U1 UST Installation/Retrofitting
size of vapor recovery piping is typically - ANSWER-2 to 3" in diameter between dispensers.
when performing a pre installation pressure test of a double wall tank pressure up the? -
ANSWER-inner tank to 5 psig for 1 hour soaping all components then pressure the interstice
with air from the inner tank and soap all components. first release pressure from interstice then
the inner tank.
when a bottom hold down pad is used under a steel tank. - ANSWER-the bedding material may
be reduced to 6"
cover in areas that are subject to vehicle traffic - ANSWER-30" compacted backfill and 6" of
asphaltic concrete, or 18" of compacted backfill and 6 to 8" of reinforced concrete. paving over
tanks in traffic areas should extend 1 foot beyond tank perimeter.
cover in non traffic areas should be atleast 2' thick and consist of a minimum of 1' of backfill
covered by filter fabric and a minimum of 1' earth. - ANSWER-an acceptable alternative is 1'
backfill material and atleast 4" of reinforced concrete or 6" of asphalt paving.
the maximum burial depth for fiberglass tanks - ANSWER-7'
the burial depth for steel tanks is? - ANSWER-5'
to provide a firm foundation set tanks on atleast....... of backfill - ANSWER-1' thick that extends
1' beyond ends and sides of tank.
how many feet of backfill is required between adjacent tanks and tanks and excavation wals? -
ANSWER-2'
excavation material must be stockpiled atleased..... from tank - ANSWER-2'
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