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U1 ust installer/retrofitters Exam Questions
And Correct Revised Answers
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.
- answer✔✔
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'
what's the allowed size for pea gravel backfill - answer✔✔3/4"
what's the allowed crushed rock backfill size? - answer✔✔1/2"
when sand is used for backfill you must compacted is ....... lifts - answer✔✔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? - answer✔✔outside of the tank diameter.
a bottom hold down pad consists of what? - answer✔✔8" of reinforced concrete that extends
atleast 8" beyond the tank sides and 1' beyond each end.
U1 ust installer/retrofitters Exam Questions
And Correct Revised Answers
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.
- answer✔✔
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'
what's the allowed size for pea gravel backfill - answer✔✔3/4"
what's the allowed crushed rock backfill size? - answer✔✔1/2"
when sand is used for backfill you must compacted is ....... lifts - answer✔✔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? - answer✔✔outside of the tank diameter.
a bottom hold down pad consists of what? - answer✔✔8" of reinforced concrete that extends
atleast 8" beyond the tank sides and 1' beyond each end.
