(a) The contractor shall not backfill sewers above the top of the pipe until the sewer elevations, gradient, alignment and the pipe joints have been checked, inspected and approved by the Engineer.
(b) Unless otherwise directed, all trenches and excavations shall be backfilled as soon as the joints have acquired a suitable degree of hardness, and the work shall be prosecuted expeditiously after it has been commenced.
(c) All pipe sewers as soon as laid shall have the space between the pipe and the bottom and sides of the trench packed full with sand or selected material by hand and thoroughly tamped with a shovel, hoe or light tamper, as fast as placed, up to the level of the top of the pipe. The filling shall be carried up evenly on both sides. Care shall be taken that no rock, frozen material or other hard substances are placed in contact with the pipe. In areas where clean, fine and dry sand is used for backfill to the top of the pipe, tamping will not be required.
(d) The pipe shall then be covered by hand to a depth of at least twenty-four inches with clean, dry earth. The material shall be placed in layers not exceeding four inches in depth and each layer thoroughly tamped and compacted, with at least one man tamping for each man depositing material in the trench.
(e) Material for backfilling the space between the pipe and the bottom and sides of the trench, and for covering to a depth of two feet, shall be clean, dry earth free from stones larger than two inches, frozen material or other hard substances, except for conditions hereinafter defined.
(f) The remainder of the trench shall be backfilled by using the material originally excavated from the ditch, except for conditions hereinafter defined, to a height slightly above the original elevation of the ground. Backfilling shall not be left unfinished more than 300 feet behind the completed masonry or pipe work.
(g) No heavy rock shall be dropped into the trench nor placed within three feet of the sewer pipe. In depositing rock in the sewer trench, care must be taken that the rock does not injure the structure. All spaces between pieces of rock shall be filled with earth to insure there being no voids. A sand or concrete backfill will be required for all pipe sewers laid in tunnel.
(h) All voids existing between the outside of the pipe and the limits of the tunnel excavation and lining shall be filled with sand free of silt, thoroughly rammed or flushed into place, or with concrete composed of one part Portland cement, three parts of fine aggregate and five parts of coarse aggregate thoroughly packed into place. Concrete shall be in accordance with that hereinbefore specified for use in concrete cradles.
(i) Sewers constructed in open cut across any existing pavements and sidewalks shall be backfilled with fine porous material tamped into place, unless the material excavated is suitable for backfilling in the opinion of the Engineer.
(j) One that part of the sewer that is constructed under unpaved areas in the streets, alleys, driveways, parking areas or other ornamental grounds, the backfilling shall be compacted by jetting with water, after which all depressions formed shall be filled to a point slightly above the original elevation of the top of the ditch.
(k) All surplus excavated material which is not used in backfilling shall be loaded and disposed of by the contractor.
(l) Any settlement of the backfill below the original ground surface shall be remedied by the contractor for a period of one year after final completion and acceptance upon receipt of written notice from the Village.
(Ord. 352. Passed 10-22-62.)