8.32.09 Appendix A to Title 8.32

(1) EXCAVATION REQUIREMENTS AND SPECIFICATIONS (a) Boring Preferred in Paved Right-of-Way. Boring is the preferred method for crossing paved town and/or County rights-of-way. Excavation shall not be approved unless it can be demonstrated that boring is infeasible or impractical as an alternative. (b) Minimum Depths for Buried Cables and Lines. All small cables, conduits, or pipelines to be buried in town rights-of-way for utility purposes shall be a minimum of twenty-four (24") below final surface grade. (c) Manner of Excavation. (i) General: 1) All excavation shall be unclassified. 2) The applicant shall perform all excavation of every description and of whatever substances encountered, to the depth specified on the plans and/or required to accomplish the work. 3) During the excavation operations the material, which might be found suitable for use in backfilling, shall be piled in an orderly manner of sufficient distance from the banks of the trench for convenience in operation equipment, to avoid embankment overloading, and to prevent slides and caveins. 4) All excavated materials not required or not suitable for backfilling shall be promptly removed from the site of the work and wasted in an area to be provided by the applicant with the approval of the inspector. 5) Grading shall be performed as may be necessary to prevent surface water from flowing into trenches or other excavations, and any water accumulated therein shall be promptly removed by pumping or by other approved method. (ii) Safety: 1) All excavating materials shall be piled in such a manner as will cause a minimum of inconvenience to public travel, the provisions shall be made for urgent traffic as necessary. 2) The applicant will be responsible for providing barricades at all excavation sites while open trenches are present. 3) Barricades must be lighted if open trenches are left overnight. 4) Free access shall be provided to all fire hydrants, water valves and meters, and clearance shall be left to enable free flow of storm water in all gutters, conduits, and natural watercourses. 5) The applicant shall utilize appropriate traffic signs, markers, and procedures in all construction activities as defined in the Federal "Manual of Uniform Traffic Control Devices." (iii) Methods: 1) Unless otherwise indicated, trench excavation shall be by open cut except that short sections of the trench may be tunneled under existing structures if the pipe can be safely and properly installed in such tunneled sections. 2) In those areas where the utility is to be installed under existing curbs and gutters and/or sidewalks, the applicant has the option whether to tunnel and backfill or to cut and remove the curb, gutter, or sidewalk. 3) In the latter case, he shall, at his expense, replace the curb, gutter, or sidewalk to match the existing structures in line, grade and type of construction. 4) Exceptions to the methods of excavation are listed in Section 8.32.05(e) of this appendix. (d) Backfill 1) Class A Backfill: a) This class of back fill shall be used in areas where immediate compaction and completion of the trench backfill is required. b) The trench above the pipe zone shall be backfilled with suitable and approved material placed in layers consistent with the type of compaction equipment to be used. c) Each layer shall be sprinkled and thoroughly tamped by means of hand-operated or mechanically operated tampers. d) Backfilling and compaction shall be done to the satisfaction of the inspector and shall be continued on each layer of backfill until a compaction of 96 per cent of maximum density is obtained as determined by ASTM designation D-698-70. e) The final one-foot of backfill is to be compacted to one hundred (100) percent of maximum density. 2) Class D Backfill: a) This class of backfill is intended for use in areas that are ultimately to be planted and where minimum compaction (above the pipe zone) is required at the present time. b) The entire depth of the trench above the pipe zone shall be backfilled with a suitable material, as approved by the inspector, to a point slightly above the existing ground surface or the finish grade if the latter is shown. c) The surface shall be continually pneumatically rolled by patrol, roller and/or crawler tractor, as the backfilling process proceeds. d) The trench backfill along the pipe centerline shall be left with a final fill above the existing ground surface of finish grade of at least one foot (1’). e) The final layers of material to be replaced shall be specified in Section 8.32.05(e). f) The surface shall be maintained by blading, sprinkling, rolling, adding additional material, etc., to maintain a safe, uniform surface satisfactory to the inspector until the required final surfacing material has been placed. (e) Restoring Surface: Restoring shall be commenced as soon as possible following excavation. Complete restoration shall be diligently pursued until complete. Unless specifically authorized by the engineering department restoration shall be completed within 72 hours of initial excavation of the total area impacted by the excavation. Excavation shall be as specified in Section 3 "Excavation", of this ordinance with the following exceptions: (i) Before trench excavation is begun, any bituminous pavement to be removed shall be cut with a saw or pneumatic tool to provide a straight, neat construction line. (ii) Pavement removed during excavation shall be wasted and not be used in backfilling the trench. 1) Backfill. Backfilling shall be class A for the entire trench depth or comply with 8.32.07 (1) vi) The surface shall be maintained by blading, sprinkling, rolling, adding additional material, etc., to maintain a safe, uniform surface satisfactory to the inspector until the required final surfacing material has been placed. 2) Asphalt Pavement Replacement: All asphalt cut edges shall be tacked prior to asphalt replacement. Asphalt must be compacted with the technical compaction equipment. The Inspector may require that asphalt be feathered out over cut area. a) Class A and B Streets: After the backfill and ¾” surfacing material have been thoroughly compacted, the remaining four inches (4”) shall be backfilled to the level of the existing asphalt with a bituminous surface course as specified above. The seal coat shall then be applied in accordance with section 403 of the "Standard Specification for Highway Construction." 3) Materials: a) Surfacing Material: Surfacing material shall be ¾” maximum crushed gravel meeting the requirements of Section 301 of the Wasatch County Design Construction Standards Handbook. b) Bituminous Surface Course: The material for the bituminous surface course shall be plant mix meeting the requirements of Section 403 of the Wasatch County Design Construction Standards Handbook. The asphalt mix design for the plant mix bituminous surface court to be used on the project shall be prepared and submitted to the inspector by the applicant proper to the beginning of the construction. c) Tack Coat: Material for bituminous tack coat shall be either MC-70, MC250 or Grade ss-1H emulsive applied at .25 gal/square yard. d) Seal Coat: Materials used in the application of the seal coat shall be as follows: i) Asphalt seal coat material shall be CRS-2H. ii) Cover coat material shall be type 2. iii) Seal coating shall meet the requirements of Section 406 of the Wasatch County Design Construction Standards Specifications.