756ELECTRICAL CONDUITS AND DUCTS UNDER ROADWAYS

662

conduit or ducts and other appliances. The material from the excavation shall be placed in a position where the least damage and obstruction to vehicular and pedestrian traffic, and the least interference with the surface will occur. All surplus excavated material shall be removed and disposed of by the Contractor, as directed by the Engineer. Excavations after backfilling shall be kept well filled and maintained in a smooth and well drained condition until permanent repairs are made. At the end of each day's work and at all other times when construction operations are suspended, all equipment and other obstructions shall be removed from that portion of the roadway open for public travel. Coordination of this type work with regular roadway or bridge work will be of prime importance to prevent undue damage to completed items of work or existing facilities. Any damage to existing facilities caused by the installation of the conduit or ducts shall be repaired by the Contractor at no additional cost to the State.

All conduits installed under paved areas shall be encased in steel pipe. Installation of the encasement shall be made prior to placement of the pavement or it shall be jacked or bored through the roadbed under the pavement providing a minimum cover of 30 inches {750 mm}. The jacking or boring procedure and equipment shall be such that placement of the casement shall be accomplished without producing an unsupported opening through the roadbed between the established ends of the required length of encasement. In no event should encasement lengths be less than the distance between shoulder limits of a roadway. The drilling and mud bore method will be acceptable provided the requirements noted in Subarticle 730.03(a) are complied with.

All conduits installed under paved areas shall be encased in HDPE duct. Installation of the encasement shall be precision directional bored through the roadbed under the pavement at the depth shown on the plans or as approved by the Engineer. The precision directional boring procedure and equipment shall be such that placement of the encasement shall be accomplished without producing an unsupported opening through the roadbed between the established ends of the required length of encasement. In no event should encasement lengths be less than the distance between shoulder limits of a roadway. The encasement shall be installed by drilling a hole with an open type bit that leaves the cuttings in place. A gel-forming colloidal drilling fluid consisting of at least 20%* high grade carefully processed Bentonite may be used to consolidate cuttings of the cutting bit, seal the walls of the hole and furnish lubrication for subsequent removal of cuttings and installations of the encasement immediately thereafter. In this method, when drilling through a dense formation, cuttings may be partially removed from the hole in 3 foot {0.9 m} plugs by use of compressed air as drilling progresses. However, in low density soils of a sandy or silty nature, a plug shall be installed in the mouth of the bore (hole) to prevent the movement of any cuttings from the hole until immediately before installation of the encasement. No bit larger than 3 inches {76.2 mm} in diameter shall have holes therein larger than 5/16 inches {8 mm} in diameter through which drilling fluid is forced during boring. The encasement shall be installed immediately after the boring hole is completed. In no case will water be used to flush cuttings from the drill hole. The cuttings shall remain in the bore hole except as previously provided for as drilling progresses so as to consolidate them to support the bore wall. The filter cake which is formed by the cuttings and drilling fluid prevents cave-in or sloughing of the drill hole. On completion of the boring, the hole will be swabbed out by pulling through the hole the encasement attached to a suitable swab. Violation of any of the above provisions by the Contractor will result in the suspension of work. (Note: By Volume. For instance, 20 gallons {20 L} Bentonite to 80 gallons {80 L} of water.)

756.04Submittals

The contractor shall transmit Material Submittals in accordance with Subarticle 105.02(d) “Submittals for Traffic Design”. Submittals shall consist of material and equipment listings along with supporting documentation as specified in Item 105.02(d)1 “Preparation of Submittals” and these specifications. Material Submittals for this specification section shall be transmitted to the designated Working Group: Design Bureau’s Traffic Engineering Division for their review and approval. The Working Group’s email address is TrafficDesignSubmittals@dot.state.al.us. PORTABLE TRAFFIC SIGNAL 663

756.05Method of Measurement

The accepted amount of electrical conduit of the type installation required shall be measured by the linear foot {meter} to the nearest foot {0.1 m}.

756.06Basis of Payment

The accepted electrical conduit, measured as noted above, will be paid at the contract unit price bid for the type installation involved. Said unit price bid shall be full compensation for the furnishing and installation of the specified pipe, duct or concrete encasement, for any required backfill material, for all excavation and backfill, jacking or boring, disposal of excess material, and for all labor, tools, equipment, and incidentals necessary to complete the work. Duct, for the purposes of pay item titles, is referred to as “conduit”, and the materials should be referenced back to the installation type.

756-A ___ inch {mm} Electrical Conduit, * Lines, Type ** Installation - per linear foot {meter} * Specify number of lines of duct or encasement ** Specify type of installation PORTABLE TRAFFIC SIGNAL

757.01Description

This Section shall cover the work of furnishing new portable traffic signals or utilizing State furnished portable traffic signals. The furnishing of new portable traffic signals includes all services and operational supplies necessary to provide a functional portable traffic signal unit. All portable traffic signals shall comply with the Manual on Uniform Traffic Control Devices (MUTCD), publications of the Institute of Transportation Engineers (ITE), the National Electrical Manufactures Association (NEMA), the National Electrical Code (NEC), and the International Municipal Signal Association (IMSA).

757.02Materials

The portable traffic signal unit shall be complete with power supply, controller, structural support system, all applicable software, communications, and manuals. Portable traffic signals shall be designated according to their type based on Table 4 PTS Type Designations shown in NEMA TS 5-2017, “Standard for Portable Traffic Signal Systems (PTSS) Standard,” or latest revision.

757.03Construction Requirements

The Contractor shall set up and level the unit at the designated location shown on the plans and approved by the Engineer. The portable traffic signal unit shall be placed on a base consisting of a fine aggregate compacted to the satisfaction of the Engineer or alternate location approved by the Engineer. After setup and leveling, the Contractor shall secure the portable traffic signal trailer to protect from theft. If the unit is stolen, the Contractor shall be required to replace the unit at his own expense. The Contractor shall provide adequate flaggers on a 24-hour per day, 7 day a week basis until the unit is replaced and fully operational. Signal heads positioned over a road surface shall be mounted a minimum of 17 feet from the bottom of the signal head to the top of the road surface. All other signal heads shall be mounted at a minimum of 8 feet from the bottom of the signal head to the top of the ground surface. The Contractor shall clean, service and repair State furnished units when the Engineer determines that the portable traffic signal unit is no longer needed and shall return the unit to the specified location shown on plans or specified by the Engineer. The aggregate pad shall be removed and disposed of as directed by the Engineer.

The Contractor shall furnish a new or used portable traffic signal unit and shall be totally responsible for the required performance of the signal. An acceptable portable traffic signal unit shall be one of the units listed on List IV-3, WORK ZONE TRAFFIC CONTROL DEVICES, Sub-Heading “Portable Traffic Signals” of the Department’s MSDSAR manual. Information concerning this list can also be found in Sub-article 106.01(f). PORTABLE TRAFFIC SIGNAL 664

The Contractor shall retain ownership of the portable traffic signal unit when the Engineer determines that the signal is no longer needed.

The Contractor shall furnish a new and fully functional portable traffic signal unit. An acceptable portable traffic signal unit shall be one of the units listed on List IV-3, WORK ZONE TRAFFIC CONTROL DEVICES, Sub-Heading “Portable Traffic Signals” of the Department’s MSDSAR manual. When the Engineer determines that the portable traffic signal unit is no longer needed, ownership shall be transferred to the Department.

The Contractor shall use a State furnished portable traffic signal unit. The Contractor shall pick- up the unit from the location shown on plans or specified by the Engineer. The Contractor shall clean, service and repair the portable traffic signal unit when the Engineer determines that the signal in no longer needed and shall return the signal to the Department.

757.0Maintenance Requirements.

The Contractor shall keep the portable traffic signal unit in good repair at all times. Each portable traffic signal unit shall have both signal heads working in full operation at all times with red/yellow/green signal faces functioning properly. Failure, malfunction, or damage to the unit, for any reason, shall require the Contractor to expedite the repair, or replacement, and furnish adequate flaggers or other approved means, at the Contractor’s expense, to provide a safe means for the control of traffic until the unit is put back into service. The Contractor shall perform maintenance to the portable traffic signal unit, which includes the periodic cleaning of the unit along with the repair of damage to the protective coating of the unit. Portable traffic signal unit furnished under Pay Item 757-B (Contractor Furnished) and Pay Item 757- C (State furnished) shall be stored in an approved, secure storage area when not in use. The Contractor shall perform all maintenance operations recommended by the manufacturer of the portable traffic signal and keep complete maintenance records.

757.05Delivery of Unit and Transfer of Title, Pay Items 757-B and 757-C

Prior to the completion of the project, and when the Engineer determines that the portable traffic signal unit is no longer needed, the Contractor shall clean and service the unit to ensure that the unit is in good operational condition and return all manuals, maintenance records and title transfer (title transfer required under Pay Item 757-B), to the Engineer. The Engineer shall inspect the portable traffic signal unit to ensure the unit is operational and undamaged before the Contractor delivers the unit back to the State. The Engineer shall authorize the Contractor to return the portable traffic signal unit to the specified location on the plans or specified by the Engineer, as soon as the inspection is complete.

757.06Method of Measurement

Measurement of portable traffic signal will be complete individual portable traffic signal unit for the type of unit furnished. There will be no overrun of this item without written permission of the Engineer.

757.07Basis of Payment

The portable traffic signal unit, measured as noted above, will be paid for at the contract unit prices which shall be full compensation for pickup and delivery of unit, installation of aggregate pad, fine aggregate for the pad, set up of unit; and providing and inputting timings of unit for the exclusive use during the project; maintenance and operation of the unit during the life of the contract; removal of the aggregate pad; and includes all equipment, tools, labor, services, supplies, and incidentals necessary to complete this item of work. The contract price for Pay Item 757-B and 757-C shall also include the cleaning, servicing, and repair of the unit and pickup from and delivery to the designated storage location.

757-A Portable Traffic Signal, Type _*_ - per Each 757-B State Retained Portable Traffic Signal, Type _*_ - per Each 757-C State Furnished Portable Traffic Signal, Type _*_ - per Each * Specify Type (TR1 or TR2)