After a new pipe has been laid in a trench, it should first be __________.

• A. partially backfilled
• B. fully backfilled
• C. left exposed
• D. backfilled to grade only

Answer: (A)

Partially backfilling is done first to provide support and protection for the newly laid pipe while you verify joints and bedding, perform any required tests, and prepare the trench for final backfill. This light cover keeps the pipe from shifting or being damaged by subsequent backfill material and equipment, but still allows access to joints for inspection before everything is buried.

Fully backfilling too soon can crush or misalign the pipe, or hide defects that need to be addressed. Leaving the pipe exposed or backfilling only to grade would not give the necessary cushion or support needed during initial trench work. Partial backfill strikes the right balance by securing the pipe and enabling checks before completing the backfill.