Chapter 12.08 EXCAVATIONS


Section 12.08.090 Resurfacing.

    After bringing the compacted backfill to finished subgrade, the holder of a permit shall employ the following methods where applicable:
    A.    Concrete Base or Surface. Where the base or surface is concrete, the permittee shall immediately after completion of backfill pour concrete meeting the requirements of ASTMC-150, Type III, high early cement. All concrete replacement depth shall be minimum of eight inches or as directed by the public works director or designated agent. The new concrete shall be properly cured out before opening the patch to traffic loads.
    B.    Bituminous Surface on Concrete Base. The permittee shall first cure out the concrete base. When cured, the permittee shall cause the surface to be reestablished by a four-inch minimum plant mix penetration bituminous patch, so installed and rolled as to obtain adequate compaction. Tack coat shall be applied to square cut edges of patch to ensure proper bonding to original surface material. The thickness of the replaced surfacing shall be the same as existing but in no case less than four inches.
    C.    Bituminous Surface on Improved Base. The permittee shall cause bituminous material of a type and grade equal to or better than the original, to be placed on the subgrade and rolled or otherwise compacted in such a way as to smoothly join the original material without noticeable rise or fall above or beneath the original grade of the adjoining material. Tack coat shall be applied to square cut edges to ensure proper bonding to original surface material. The thickness of the replaced surfacing shall be the same as existing but in no case less than four inches.
    D.    Unimproved Surface. Where the excavation is on unimproved surfaces, the backfill shall be brought to finish grade by using the material compaction methods and surface acceptance, as provided in Sections 12.08.070 and 12.08.080. When the trench is in natural soil, the top six inches shall be filled with topsoil equal to the natural topsoil of the surrounding area. This shall then be graded and shaped to conform to the natural contours of the area.
    E.    Resurfacing Materials. Materials used in resurfacing shall be as follows:
    1.    Prime Coat. All subgrades shall be primed with MC cutback oils before making a patch, where required in writing by the public works director or designated agent.
    2.    Plant Mix Asphaltic Types. Asphaltic mix shall be the type and grade specified by the public works director.
    3.    Seal Coat. Roadways that have been seal coated within two years prior to excavation shall be seal coated after asphaltic material is installed.
    4.    Asphaltic Hot Mix or Cold Mix. Asphaltic plant hot mix, if available within ten miles, shall be used from April 1st to October 31st of any year. Asphaltic plant cold mix shall be used from November 1st to March 31st of any year and shall thereafter be removed and replaced with hot mix if available within ten miles.
    F.    Warranty. The holder of the permit shall warrant the work to be free from backfill settlement and surface condition for two years following the completed, accepted work. Warranty starts on date project is accepted by the public works director or his designated agent. (Ord. 155 (part), 1999: prior code § 12.03.090)