A sewer trench bottom contains soft, disturbed pockets. What is needed before pipe placement?
- Stable uniform bedding
- BRandom blocks under the barrel
- CAdditional vent terminals
- DLoose debris beneath each joint
Why A is correct
Weak or uneven support allows settlement, loss of grade, joint separation, and deformation after backfill. Approved bedding and preparation create continuous support without point loading the pipe.