(A) Backfilling in any street opened or excavated pursuant to an excavation permit issued hereunder shall be compacted to a degree equivalent to that of the undisturbed ground in which the trench was dug. Compacting shall be done by mechanical tappers or vibrators, by rolling in layers. When water is taken from a fire hydrant, the permittee shall assign one person to operate the hydrant and shall make certain that said person has been instructed by the city's Water Department in the operation of the hydrant. The Water Department shall likewise be notified at both the beginning and end of the job so that the condition of the fire hydrants can be checked on both occasions. Any damage done to the hydrant during the excavation shall be the responsibility of the permittee. Water shall be paid for by the permittee on the terms agreed upon with the Water Department.
(B) Backfilling up to the first eighteen (18) inches above the top of the utility pipes or similar installations shall be done with thin layers. Each layer is to be tamped by manual or mechanical means. Layers that are hand tamped shall not exceed six (6) inches in thickness. Layers that are power tamped shall not exceed six (6) inches in thickness. The same requirements shall apply to the remainder of the backfilling if tamping is the method used for backfilling. Backfilling of all pipes over twenty-four (24) inches in diameter shall be carried up to the spring line of the pipe in three-inch layers, with each layer moistened and thoroughly tamped with suitable mechanical equipment. The backfill around all pipes twenty-four (24) inches or less in diameter, shall be tamped as specified above to a depth of eighteen (18) inches above the top of the pipe before any additional backfilling is placed thereon.
(C) Whenever any excavation for the laying of pipe is made through rock, the pipe shall be laid six (6) inches above the rock bottom of the trench and the space under, around, and six (6) inches above the pipe shall be backfilled with clean river sand, non-corrosive soil, or one quarter (1/4) inch minus gravel. Broken pavement, large stones, and debris shall not be used in the backfill.
(D) Backfilling shall be completed by placing the backfill material well up over the top of the trench. For dry backfilling, the material shall be compacted with a roller of an approved type or with the rear of a truck carrying at least five (5) tons until the surface is unyielding. The surface shall then be graded as required.
(Ord. passed 2-17-86) Penalty, see § 91.99