A storm pipe run needs 240 ft of bedding, 4 ft wide and 6 in. thick. Including a 10 percent ordering allowance, how many cubic yards of bedding aggregate are needed?
Correct Answer
B) 19.6 cy
Bedding volume is 240 x 4 x 0.5 = 480 cf. 480/27 = 17.8 cy; adding 10 percent gives 17.8 x 1.10 = 19.6 cy. Other choices omit the allowance, add too much allowance, or treat 6 in. as 0.6 ft.
Why This Is the Correct Answer
Bedding volume is 240 x 4 x 0.5 = 480 cf. 480/27 = 17.8 cy; adding 10 percent gives 17.8 x 1.10 = 19.6 cy. Other choices omit the allowance, add too much allowance, or treat 6 in. as 0.6 ft.
Why the Other Options Are Wrong
Option A: 17.8 cy
pipe bedding volume, choice b: the answer choice lifts 17.8 cy from the working line 480/27 = 17.8 cy.
Option C: 21.4 cy
pipe bedding volume, choice c: 21.4 cy equals about 577.8 cf after cubic-yard conversion; the accepted cubic-foot volume is 480 cf before dividing by 27 in.
Option D: 24.0 cy
pipe bedding volume, choice d: 24.0 cy is wrong because 24.0 cy equals about 648 cf after cubic-yard conversion; the accepted cubic-foot volume is 480 cf before dividing by 27 in.
Memory Technique
Keep a ledger line beside pipe bedding volume: if one number is skipped, the option drifts away from 19.6 cy.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use the index entry or section for "Pipe bedding aggregate quantity takeoff" to confirm that Bedding volume is 240 x 4 x 0.5 = 480 cf.
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