Question: 6. A contractor is excavating a trench that is 8 ft wide and 600 ft long with an average depth of 12 ft. A 42

6. A contractor is excavating a trench that is 8 ft wide and 600 ft long with an average depth of 12 ft. A 42 in (outside diameter) sewer line is placed into the trench, which is then backfilled and compacted with the removed soil. The soil has a swell of 30% and a shrinkage of 20%

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