27 CAR § 91-304
27 CAR § 91-304. Bedding and backfill
Length: 91 wordsOfficial source
(a) Bedding and backfill shall consist of fine granular material free of:
(1) Lumps;
(2) Clods;
(3) Stones; or
(4) Other debris.
(b) Backfill shall be compacted by mechanical tamping with controlled moisture.
(c) Bedding shall be placed to a depth of six inches (6”) or half the diameter of the pipe, whichever is less.
(d) Backfill for bore pits shall be thoroughly compacted to match grade and density equal to or exceeding the surrounding undisturbed soil.
(e) Consolidation of backfill by saturation or ponding with water shall not be permitted.