(a) Trench excavation and backfill shall be accomplished in accordance with the applicable provisions contained in the Standard Specifications for Public Works Construction dated September 1986 and Standard Details for Public Works Construction, dated September 1984, as amended, of the department of public works, City and County of Honolulu.
(b) The permittee shall provide, in connection with the work covered by the permit, all necessary traffic control devices, which shall conform to the requirements of the “Rules and Regulations Governing the Use of Traffic Control Devices at Work Sites or Adjacent to Public Streets and Public Highways” of the State highway safety coordinator. The permittee shall be responsible for all damages of every kind or nature suffered because of the work done by the permittee.
(c) In dewatering trenches, the discharge shall not be drained directly onto the street or gutter. In urban areas and areas where a storm sewer system has been installed, the discharge shall be drained to the nearest storm sewer by the use of pipes or other suitable means acceptable to the chief engineer. If necessary, the discharge shall be processed, filtered, ponded, or otherwise treated to comply with the applicable provisions of Hawaii Administrative Rules, Chapter 11-54, “Water Quality Standards” and Chapter 11-55, “Water Pollution Control” and any other applicable federal, State, and city ordinances and regulations concerning water pollution before its release into waterways or city storm sewer systems. No work shall commence unless a construction dewatering permit is first obtained from the chief engineer. The permittee is also required to obtain a NPDES permit for the discharge of any pollutant into State waters through the city-owned storm sewer system from the State department of health. The city shall receive a copy of the NPDES permit and all analysis of the discharge required under the NPDES permit whenever the city-owned storm sewer system is used for the dewatering operation. Whenever the discharge is released directly into waterways not owned by the city, only a NPDES permit is required.
(d) Concrete envelope or jacket for pipes or duct lines shall be not more than 6 inches wider than the width of the concrete envelope or jacket shown on the plan or drawings submitted by the applicant for a trenching permit. Whenever this tolerance is exceeded, the sides of the concrete envelope or jacket shall be formed to maintain the dimensions shown on the plan or drawings.
(e) The permit holder shall, upon completion of the backfilling and compaction of any excavation and after inspection and approval by the chief engineer, immediately commence the necessary work to restore the foundation and surface, including any public structure appurtenant thereto, to its original or equally good condition. The chief engineer may require compaction tests be performed to assure that the backfill has been compacted to the required density. Backfill not conforming to the specified degree of compaction shall be recompacted or removed and replaced with suitable material. Restoration shall be accomplished in accordance with the applicable provisions contained in the Standard Specifications for Public Works Construction dated September 1986 and Standard Details for Public Works Construction dated September 1984, as amended, of the department of public works, City and County of Honolulu. Pavement restoration over the trench excavation shall be similar to that existing before the excavation, i.e., concrete base course shall be replaced with concrete of the same thickness.
(f) When trenching in concrete sidewalks or concrete pavement the concrete to be removed shall first be cut with a saw to a depth of not less than one-fourth the depth of the slab. The concrete shall be cut so as to leave a 6-inch wide undisturbed surface between the cut and the side of the trench. When any portion of a sidewalk block measuring 4 feet or less in dimension is cut, trenched, or damaged during construction, the entire block shall be removed and replaced. A sidewalk block greater than 4 feet in dimension that is cut, trenched, or damaged shall be removed and replaced in such a manner that the replaced and remaining strip or block shall be not less than 4 feet wide. The replaced sidewalk block shall be scored, finished, and colored to match the finish and color of the adjacent blocks.
(g) All agencies having construction performed under a trenching permit shall submit as-built drawings to the chief engineer showing the actual construction performed.
(Sec. 20-1.3, R.O. 1978 (1983 Ed.)) (1990 Code, Ch. 14, Art. 17, § 14-17.3) (Am. Ord. 92-122)