No frozen material shall be used for backfilling. All backfilling on pipe and conduit installations shall be placed by hand and tamped in thin layers for a depth of at least eight inches above the top of the pipe or conduit. Only select material, free from stones larger than two inches, shall be used for this purpose. The material shall be placed in layers not exceeding four inches in depth, and each layer shall be thoroughly tamped and compacted to a point eight inches above the top of the pipe. No rock or other hard substance shall be placed in contact with the pipe or conduit. The remainder of the backfill can be placed mechanically and to a height slightly above the original elevation of the ground.
Backfilling around masonry structures shall be deposited in this layers thoroughly compacted.
Backfilling under paved areas shall consist of porous material tamped in place. Any surplus material from excavation remaining at the completion of the work on the contract shall be removed and disposed of by the contractor.
(Ord. 352. Passed 10-22-62.)