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A staging pad is 160 ft by 90 ft and needs 8 in. of compacted aggregate base. Using 1.6 tons per cubic yard, what aggregate tonnage is closest?

Correct Answer

B) 569 tons

Area is 160 x 90 = 14,400 sf. Thickness is 8/12 = 0.667 ft, so volume is 9,600 cf or 355.6 cy. At 1.6 tons/cy, tonnage is 355.6 x 1.6 = 568.9 tons, or about 569 tons. Other choices use 6 in. thickness, a higher density, or a waste factor not stated.

Answer Options
A
474 tons
B
569 tons
C
640 tons
D
711 tons

Why This Is the Correct Answer

Area is 160 x 90 = 14,400 sf. Thickness is 8/12 = 0.667 ft, so volume is 9,600 cf or 355.6 cy. At 1.6 tons/cy, tonnage is 355.6 x 1.6 = 568.9 tons, or about 569 tons. Other choices use 6 in. thickness, a higher density, or a waste factor not stated.

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