U1 UST INSTALLATION RETROFITTING ACTUAL TEST
PAPER 2025/2026 QUESTIONS WITH ANSWERS GRADED
A+
✔✔cover in areas that are subject to vehicle traffic - ✔✔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. - ✔✔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 - ✔✔7'
✔✔the burial depth for steel tanks is? - ✔✔5'
✔✔to provide a firm foundation set tanks on atleast....... of backfill - ✔✔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? - ✔✔2'
✔✔excavation material must be stockpiled atleased..... from tank - ✔✔2'
✔✔what's the allowed size for pea gravel backfill - ✔✔3/4"
✔✔what's the allowed crushed rock backfill size? - ✔✔1/2"
✔✔when sand is used for backfill you must compacted is ....... lifts - ✔✔12 to 18" lifts
and must compact after each lift. repeat until this level is atleast 60% of vertical height
of tank.
✔✔when deadmen are used you should place them where? - ✔✔outside of the tank
diameter.
✔✔a bottom hold down pad consists of what? - ✔✔8" of reinforced concrete that
extends atleast 8" beyond the tank sides and 1' beyond each end.
✔✔hold down straps for steel tanks should be? - ✔✔non metallic or flat steel. the use of
wire ropes or round bar is not acceptable.
PAPER 2025/2026 QUESTIONS WITH ANSWERS GRADED
A+
✔✔cover in areas that are subject to vehicle traffic - ✔✔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. - ✔✔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 - ✔✔7'
✔✔the burial depth for steel tanks is? - ✔✔5'
✔✔to provide a firm foundation set tanks on atleast....... of backfill - ✔✔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? - ✔✔2'
✔✔excavation material must be stockpiled atleased..... from tank - ✔✔2'
✔✔what's the allowed size for pea gravel backfill - ✔✔3/4"
✔✔what's the allowed crushed rock backfill size? - ✔✔1/2"
✔✔when sand is used for backfill you must compacted is ....... lifts - ✔✔12 to 18" lifts
and must compact after each lift. repeat until this level is atleast 60% of vertical height
of tank.
✔✔when deadmen are used you should place them where? - ✔✔outside of the tank
diameter.
✔✔a bottom hold down pad consists of what? - ✔✔8" of reinforced concrete that
extends atleast 8" beyond the tank sides and 1' beyond each end.
✔✔hold down straps for steel tanks should be? - ✔✔non metallic or flat steel. the use of
wire ropes or round bar is not acceptable.
