A trench run is 200 ft long and requires bedding 4 ft wide by 0.5 ft deep. How many cubic yards of bedding are needed?
Correct Answer
D) 14.8 cu yd
Bedding volume is 200 x 4 x 0.5 = 400 cu ft; 400 / 27 = 14.8 cu yd.
Why This Is the Correct Answer
Bedding volume is 200 x 4 x 0.5 = 400 cu ft; 400 / 27 = 14.8 cu yd.
Why the Other Options Are Wrong
Option A: 7.4 cu yd
pipe bedding volume direct, choice a: 7.4 cu yd reflects a different quantity stage than the final takeoff.
Option B: 13.3 cu yd
pipe bedding volume direct, choice c: 13.3 cu yd is wrong because 13.3 cu yd reflects a different quantity stage than the final takeoff.
Option C: 16.0 cu yd
pipe bedding volume direct, choice d: 16.0 cu yd reflects a different quantity stage than the final takeoff.
Memory Technique
Store pipe bedding volume direct with its last math move; nearby answers are usually unfinished versions of 14.8 cu yd.
Reference Hint
Open Pipe and Excavation Contracting, 2011; use by topic index - bedding / backfill / compaction to confirm that Bedding volume is 200 x 4 x 0.5 = 400 cu ft; 400 / 27 = 14.8 cu yd.
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