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.
634 Foundations for wooden poles shall be excavated to dimensions slightly larger than the pole diameter and the excavation around the pole shall be backfilled with suitable random material in horizontal layers no t to exceed 4 inches after compaction. Each lift shall be compacted to the satisfaction of the Engineer. Testing is not required. Depth of the pole foundation shall be as specified on the Plans. A device to hold the wooden pole in place with the proper rake until backfilling is complete shall be provided. Blocks wedged between the excavation and the pole are not acceptable. Ground rods shall be ¾ inch in diameter with a minimum length as shown on the Plans and shall be one piece. Sectional or segmented ground rods are not permitted. All signal supports shall have ground rods. The ground rods shall be complete with ground clamp and square head bolt.
660.9 -LOOP TRAFFIC DETECTORS : Installation shall conform to the details and notes shown on the Plans. Slots cut in the pavement for the loop conductor shall be neat and true to the dimensions shown on the Plans. Slots shall be blown out and dried before loop conductors are installed. The # 14 THWN stranded loop conductor shall run continuous and unspliced from the roadway loop to a junction box or condulet as indicated in the Plans. Each loop shall consist of a single separate wire and shall be connected to the detector by a separat e lead -in wire. The loops shall consist of three turns of wire, unless otherwise specified. All loop wire installation shall be made without damage to the wire or its insulation and all damaged wires shall be replaced. The wire must be so placed that th ere are no kinks or curls and no straining or stretching of the insulation. It shall be installed and secured as deep in the slot as possible. A blunt object, similar to wooden paint stirrer shall be used to seat the loop wire. A screwdriver or other sh arp tool shall not be used for this purpose. Prior to placing the loop slot sealant, the loop wire shall be checked for continuity, resistance and insulation integrity. Insulation integrity shall be checked by applying a megger between each end of the lo op wire and the nearest reliable electrical -ground street light, fire hydrant, etc. If no available ground exists, a suitable ground shall be established for the measurement, (e.g., driven metal spike). The megger reading shall be in excess of ten megohms under all conditions, (500 volts DC). The continuity and megger checks shall be recorded by the Engineer. Lead -in wire from the loop conductor to the detector terminal strip shall be two # 14 AWG solid copper. The lead -in wire shall also be continuous and unspliced from junction box or condulet to the detector terminal strip in the cabinet. Splices between the loop conductor and the lead -in wire shall be soldered with fuseable metal or alloy. These splices shall first be joined and made mechanicallys ecure and tested electrically. No spring connectors will be allowed for splicing. When the mechanical connection has been shown to be electrically functional under operational conditions, it shall then be soldered. Each splice shall then be insulated wi th a permanent, waterproof covering as specified or as approved by the Engineer. Waterproof adhesive shall be applied to the splice and on at least two
then be covered with half -lapped, ¾ inch, self -bonding electrical tape; starting at the center of the splice and proceeding to ¾ inch onto the wire insulation, returning to the center of the splice. The entire splice shall then be wrapped with half -lapped, ¾ i nch, all -weather electrical tape using the same procedure as above. When both ends of the loop wire and lead -in wires are so spliced and wrapped, both splices shall then be wrapped together with ¾ inch, all -weather electrical tape. The