314.4, Excavations, is hereby deleted in its entirety and the following provisions shall be substituted therefor:

All excavations shall be completely backfilled as soon after inspection as possible. To ensure adequate bedding of piping and prevent damage to such piping, trenches shall be backfilled in thin layers to twelve (12) inches above the top of the piping with clean earth, which shall not contain stones, boulders, cinderfill or other materials which would damage or break the piping or cause corrosive action. Mechanical devices such as bulldozers, graders, etc., may then be used to complete backfill to grade. Fill shall be properly compacted under sidewalks, parking lots, driveways and similar situations. Mounding of sewer without compaction is an acceptable practice in open yards. Approved material for pipe bedding or plumbing underground and sanitary sewers shall be a minimum of one-quarter (1/4) inch washed rock or material of similar size. Sand is not an approved material.