(A) Backfill
(1) Backfill on
Class 1 - Concrete pavement,
Class 2 - Brick pavement on concrete base,
Class 3 - Asphaltic concrete pavement on concrete base,
Class 4 - Asphaltic concrete pavement on stone or gravel base,
Class 5 - Gravel roadway (plain or oiled) and
Class 6 - Concrete sidewalks, shall be as follows:
(a) Material to be used for backfill shall be pitrun gravel with a maximum size of 3 inches. It is not necessary for the gravel to be 40% crushed. Also, it is permissible to use washed gravel from sizes Number 3 to Number 9.
(b) The granular material shall be tamped solidly under and around the structure to a height of 6 inches above the structure. In the case of gas mains, suitable material such as loam or stand may be substituted up to a point 6 inches above the pipe. This material shall be carefully thrown in with shovels and not dumped directly into the trench from barrows, trucks, etc.
(c) Pitrun gravel shall be compacted with water. When compacting with water, the granular material may be deposited in ponded water, or it may be placed in layers not exceeding 3 feet loose depth, and each layer shall be thoroughly saturated with water.
(d) In openings less than 25 feet, the pitrun gravel can be backfilled by tamping with a pneumatic tamper in layers of not more than 6 inches.
(e) The backfill shall be brought to a plane parallel to and a uniform depth to the subgrade below the finished pavement.
(2) Backfill on sodded areas and unimproved areas shall be as follows: materials acceptable for use in backfilling shall be free from lumps and frozen or frosted materials. Lumps larger than 3 inches in diameter shall be broken up before placing in the fill. The material shall contain sufficient moisture to permit compacting, but wet, soggy material is not to be used. All water and soft mushy material shall be removed from the openings before starting the fill. Unsatisfactory backfill material shall be replaced with pitrun gravel. The backfill shall be compacted thoroughly.
(B) Tunnels under pavements. Tunneling is often necessary where a pipe or conduit passes under the curb, tracks, or other conduits. Where tunneling extends more than 5 feet from an opening, special permission shall be obtained. Where tunneling has been done, the permittee shall bed the conduit being installed in fine material to a height of one foot above the top thereof. This fine material shall be wetted and tamped under, around, and over the pipe or conduit in the most thorough and careful manner. The balance of the space from the top of this filling to the roof of the tunnel shall be completely filled with 1-12 concrete of suitable consistency, thoroughly tamped to fill the entire space and to afford a rigid support for the tunnel roof for its entire area. The concrete shall contain not less than 3.0 sacks of cement per cubic yard. In the installation of small service pipes, it is suggested that the pipe be jacked through and under tracks, curbs, etc., or that a hole be bored of sufficient size for the pipe.
(C) Temporary restoration. When the pavement is to be repaired temporarily, the fill above the bottom of the paving slab shall be made with stabilized crusher-run gravel, Grade “A”, B-32 Base Course, well tamped into place. This gravel shall be topped with a minimum of 2 inches of bituminous mixture which is suitable to maintain the opening in good condition until permanent restoration can be made. The temporary restoration shall be level with the adjoining pavement. The permittee must exercise special care in making temporary restoration and must maintain this temporary restoration in safe travelable condition until such time as permanent restoration is made.
('70 Code, § 903.06) Penalty, see § 92.99