660.3 -GENERAL : Construction methods shall conform to the requirements of the Plans and the latest issue of the West Virginia Division of Highways Standard and Supplemental Specifications, except as modified.
660.4 -MAINTAINING TRAFFIC: During the installation of traffic signals and appurtenances, the roadway shall be kept open to all traffic by the Contractor in such a way that both local and through traffic wi ll be adequately and safely accommodated through the work area. See the Manual, “Manual on Temporary Traffic Control for Streets and Highways ”, and applicable sections of the Specifications.
660.5 -REMOVING EXISTING SIGNAL EQUIPMENT : Existing traffic signal equipment at the intersection shall be removed by the Contractor. If there is not a pay item in the proposal, the Contractor shall remove the signal heads, controller and poles and rende r the equipment unusable as traffic control devices. If there is a pay item in the Proposal for signal removal, the Contractor shall remove the controller, signal heads, hardware and poles, if required, in such a manner so as not to damage the equipment. These heads, controllers and poles shall be turned over to the Engineer and become the property of the Division. Salvaged wire and conduit shall become the property of the Contractor. When a foundation is to be abandoned, the top of foundation, anchor bo lts, and conduits shall be removed to a depth of not less than six (6) inches below the surface of the sidewalk or unimproved ground. The resulting hole shall be backfilled with material equivalent to the surrounding material.
660.6 -REMOVING AND REPLACIN G IMPROVEMENTS : Existing improvements, such as sidewalks, curbs, gutter, Portland cement and asphalt concrete pavement, underlying material, lawns and plants, and any other improvements rem oved, broken or damaged by the Contractor ’s operations, shall be replaced or reconstructed with the same kind of material as found on the work or with materials of equal quality. The new work shall be left in a serviceable condition. Whenever a part of a square or slab of existing concrete sidewalk, curb, gutter, or driveway is broken or damaged, the entire square, section or slab shall be removed and the concrete reconstructed as specified above. The outline of all areas to be removed in Portland cemen t concrete sidewalks and driveways and in pavements shall be cut to a minimum depth of two ( 2) inches with an abrasive - type saw prior to removing the sidewalk, driveway and pavement material. Cuts shall be neat and true with no shatter outside the removal area.
660.7 -EXCAVATING AND BACKFILLING : Excavations required for the installation of foundations, conduit and other appurtenances shall be performed in such a manner as to avoid any unnecessary damage to streets, sidewalks, landscaping, and other improvements. Pavement cuts and excavations shall be no wider than necessary for the proper installation of the electrical appurtenances and foundations, or as required for the proper replac ement of pavements or other improvements. Excavation shall not be performed until immediately before installation of conduit, foundations or other appurtenances. The material from the excavation and the equipment used in
633 the excavation shall be placed in a position that will least interfere with surface drainage and that will least obstruct vehicular and pedestrian traffic. At the end of each day ’s work, and at all other times when construction operations are suspended, all equipment and other obstructio ns shall be removed from the portion of the roadway open for use by vehicular and pedestrian traffic. All surplus excavation material shall be removed and disposed of, within 48 hours, outside of the highway right -of-way, unless otherwise directed by the Engineer. All excavations shall be backfilled with suitable random material in horizontal layers not to exceed four ( 4) inches after compaction. When the trench width is less than twelve ( 12) inches, each lift shall be compacted to the satisfaction of th e Engineer. Testing is not required. When the trench width is twelve ( 12) inches or greater, each lift shall be compacted to 95 percent (95%) of the maximum dry density. All surplus material shall be removed from the right -of-way and the backfill finished flush with surrounding natural ground, including replacement of any damaged facilities or appurtenances. The Contractor shall restore all areas disturbed by this excavation or other operations to their original conditions including grading, seeding, mul ching and fertilizing as directed by the Engineer.
660.8 -FOUNDATIONS : Foundations for controller cabinets and signal support structures shall be of Class B Portland cement concrete and shall be proportioned, mixe d and placed in accordance with All reinforced material used in signal support structures shall be in conformation with Sections 602 and 709 of the Specification. The Contractor shall inform the Engineer when the excavation is complete and no concrete shall be placed until the Engineer has approved the excavation for each individual foundation. No foundation shall be set over recent fill of extensive depth or muck except by the approval of the Engineer. For foundations set in solid rock see Standard Details. Foundations shall conform to the sizes and shapes shown on the Plans and shall be monolithic. Forms shall be used for the top twelve ( 12) inches of a foundation; they shall be true to line and grade and securely braced in place. Tops of foundations shall be finishe d to curb or sidewalk grade or as directed by the Engineer. When embedded poles are used, a pre -cast concrete block or concrete cast in place twenty - four ( 24) hours before setting the pole, shall be set in the bottom of the foundation excavation as shown on the Standard Detail sheet. Suitable anchoring devices to hold the embedded pole in the proper positions, until the surrounding concrete has set for at least twelve ( 12) hours, must be provided. These devices must be approved by the Engineer and the po le shall not be allowed to be set without such devices. Anchor bolts shall be accurately set in accordance with a detail furnished by the pole manufacturer. Conduit ends and anchor bolts shall be held in the proper position and to the proper height by me ans of a template until the concrete sets. Forms shall be oiled and excavation surfaces that come in contact with the concrete shall be thoroughly moistened before concrete placement. Forms shall not be removed until the concrete has thoroughly set. Ordinary surface finish as described in Section 601 of the Specifications shall be applied to exposed surfaces of concrete. All concrete foundations shall be allowed to set for 72 hours before any support structures are installed. Support structures shall b e plumb or raked as directed by the Engineer.