(A) All native material or sand used for backfill shall be free from frozen materials, rocks, foreign material that may decompose, and other materials that may affect the stability of the backfill.
(B) All trenches and structure excavations shall be backfilled as soon as the jointing compound, mortar, concrete, and the like, has attained a suitable degree of hardness, and this work shall be prosecuted expeditiously until completed.
(C) In the case of excavations for any kind of pipe or conduit, the space between the pipe and conduit and the bottom and sides of the trench shall be packed and compacted as fast as placed, up to the level of the top of the pipe or conduit. The material shall be deposited carefully in the trench to avoid injuring the pipe or conduit and shall be placed in layers not more than 6 inches in thickness, and each layer shall be solidly and carefully tamped with appropriate tools. The filling shall be carried up evenly on both sides. The above method shall be used to cover the pipe or conduit to at least 1 foot above its top.
(D) All tamping above an elevation of 1 foot above the crown of the pipe or conduit shall be done with pneumatically operated tampers in layers not more than 6 inches in thickness, or mechanical tampers in layers not more than 12 inches in thickness, or mobile trench compactors in layers not more than 36 inches in thickness. Other tampers may be approved for use by the City Engineer. Tamping with the side or the bottom of an excavating bucket shall not be acceptable. Flushing will not be allowed unless specifically authorized by the City Engineer.
(E) When the trench is filled the contractor shall remove all surplus material leaving the street, alley, or sidewalk clean and in good order.
(1975 Code, § 22-33) (Ord. 608, passed 8-16-1973) Penalty, see § 10.99