(A) Backfill shall be placed in maximum eight-inch lits and compacted with tampers to 95% of Standard Proctor AASHTO-99 density, except backfill under structures, which shall be compacted to 98% of Standard Proctor Density. Backfill in the roadways shall be tamped to NCDOT requirements.
(B) Pipe trenches shall be backfilled as soon as possible after pipe installation.
(C) Where sheeting is used, use all reasonable measures to prevent the loss of support of the pipe or backfill when the sheeting is removed. If significant volumes of soil cannot be prevented from clinging to the extracted sheets, the voids shall be continuously backfilled as rapidly as possible. Thereafter, limit the depth below subgrade that sheeting will be driven in similar soil conditions or employ other appropriate means to prevent a loss of pipe support. Sheeting embedded in granular fill or backfill materials shall be left in place.
(Ord. passed 6-21-2011)