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u1 ust installer retrofitters Questions & answers with Complete solutions | Latest edition
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u1 ust installer retrofitters Questions & answers with Complete solutions | Latest edition
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u1 ust installer/retrofitterswhen a bottom hold down pad is used under a steel tank. - ANS-the bedding material
may be reduced to 6"
cover in areas that are subject to vehicle traffic - ANS-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.
- ANS-
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. - ANS-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 - ANS-7'
the burial depth for steel tanks is? - ANS-5'
to provide a firm foundation set tanks on atleast....... of backfill - ANS-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? - ANS-2'
excavation material must be stockpiled atleased..... from tank - ANS-2'
what's the allowed size for pea gravel backfill - ANS-3/4"
what's the allowed crushed rock backfill size? - ANS-1/2"
when sand is used for backfill you must compacted is ....... lifts - ANS-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? - ANS-outside of the tank
diameter.
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