538ROADWAY PIPE REHABILITATION

420

Inspection of the pipeline shall be performed by experienced personnel trained in locating breaks, obstacles, connections, and junctions by closed circuit television. The interior of the pipeline shall be carefully inspected to determine the location of any conditions which may prevent proper installation of the liner into the pipe. Prior to installation of PE liner pipe the Contractor shall follow the inspection requirements given in ASTM F 585. A video tape and suitable log shall be submitted to the Engineer for review prior to the installation of the liner. The installation of the liner shall not begin until the Engineer informs the Contractor that the review of the inspection tape and log has been completed.

The Contractor shall clean the pipeline of all obstructions that will prevent the insertion of the liner. Prior to installation of PE liner pipe the Contractor shall follow the cleaning requirements in ASTM F 585. The Contractor shall perform minor repairs to the pipe (patching spalls, sealing holes, etc.). If the extent of obstruction and damage is severe, the Engineer may require the Contractor to uncover the pipe, remove the obstructions, and repair the pipe. Excavation and repair work will be paid for as Extra Work. The Contractor shall not install the liner in roadway pipe sections having dropped joints or line swags without prior approval from the Engineer.

The Contractor shall provide for the flow of water around the section or sections of pipe designated to be rehabilitated. Any diversion of water shall be approved by the Engineer prior to diversion. The Contractor shall notify the local fire department and water board and obtain approval and water meter, if required, before using fire hydrants.

The Contractor shall be responsible for delivery, storage, and handling of products. Products shall be kept safe from damage. Damaged products shall be removed from the job site promptly and shall be replaced with undamaged products.

The Contractor shall install the pipe liner in accordance with the installation procedures that have been distributed by the Engineer after being submitted by the Contractor. The Contractor shall install the PE liner pipe in accordance with the installation procedures given in ASTM F 585. The annular space between the existing pipe and the PE liner pipe shall be filled with a low density grout or concrete. A full protocol for time, rate of travel of the ultraviolet assembly, pressures, and amount of lamps in operation shall be maintained and submitted as documentation for the correct ultraviolet light curing of the fabric tube. The protocol shall be recorded automatically from the beginning of inflation of the liner until the end of the curing. It shall also show the basic information in a header, such as project name, address, section, and date, to clearly identify the renovated section.

If there is not a tight seal in a junction box, inlet or headwall, the Contractor shall apply a sealant at that point by pressure injection or other means to ensure a watertight seal. The repair shall be rechecked after 48 hours to ensure that the seal is holding. If the seal does not hold, the Contractor shall continue to apply sealant until a seal is made and there are no leaks. The Contractor shall seal the pipe without additional compensation.

Inspection of the pipeline shall again be performed by experienced personnel trained in the use of closed circuit television for the inspection of pipes. The interior of the pipeline shall be carefully inspected to determine if there are areas where the liner does not adhere to the pipe wall, or if there are ruptures in the lining. A video tape and suitable log shall be submitted to the Engineer for review after the installation of the liner. All repairs shall be made without additional compensation.

After the installation work and inspection has been completed and the work found acceptable, the Contractor shall clean up the work area. All excess material and debris not incorporated into the permanent installation shall be disposed of by the Contractor. The work area shall be left in a condition equal to or better than prior condition. TRENCH DRAINS 421

All pipe rehabilitation work shall be warranted to be free from defects in materials and workmanship for a period of five years from the date of rehabilitation. The Contractor shall obtain a written warranty from the supplier of the cured-in-place liner system or PE liner pipe and submit it to the Engineer after the initial inspection and before installation begins. The warranty should include the statement that any defect that occurs during a five year period that is attributable to the liner installation or materials will be repaired by the supplier at no cost to the ALDOT. It should be noted in the warranty that the five year period shall begin upon final acceptance of the rehabilitated pipe.

538.04Method of Measurement

Roadway pipe rehabilitation will be measured in linear feet {meters} along the flowline of the rehabilitated pipe.

538.05Basis of Payment

Roadway Pipe Rehabilitation, measured as noted above, will be paid for at the contract unit price, which shall be full compensation for submittals, furnishing and installing the pipe lining, cleaning and minor repair of the pipe, the warranty and for all equipment, tools, labor and incidentals necessary to complete the work. The contract price shall also include television inspection before and after liner installation.

538-A inch {mm} Roadway Pipe Rehabilitation - per linear foot {meter} 538-B inch {mm} Span, inch {mm} Rise Roadway Pipe Rehabilitation - per linear foot {meter} TRENCH DRAINS

539.01Description

This Section shall cover the work of constructing trench drains. The drains shall be of cast-in-place concrete drains or prefabricated drainage channels encased in cast-in-place concrete. The drains shall be constructed to form a channel for the collection and flow of stormwater. Grates shall be installed to allow water to pass into the channel and to allow vehicular traffic to move over the drains.

539.02Materials

The minimum width and depth of the drain channel below the drain grate will be shown on the plans. The drain channel shall have a rounded bottom. Connections to structures shall not restrict the hydraulic flow of the drain channel.

The drain channel shall have a smooth interior face. The roughness coefficient for the interior face of a prefabricated drain channel shall not be greater than 0.010. The interior face of a cast-in-place drainage channel shall have a Class 2 surface finish in accordance with the requirements given in Section 501.

The concrete shall be Class A concrete in accordance with the requirements given in Section 501. The minimum amount of concrete around the drain channel will be shown on the plans. Concrete shall be placed in a monolithic pour between inlet structures. Construction joints will only be allowed if approved by the Engineer. If joints are allowed they shall be constructed with a water stop and a concrete lug or keyway approved by the Engineer.

The grates, and the frames for supporting the grates, shall be made from ductile iron conforming to ASTM A 536, Grade 65-45-12 or cast iron conforming to ASTM A 48 Class 38B. The opening in the grate shall be a minimum of 60% of the open area at the top of the drain except where ADA regulations apply as shown on the plans. The Contractor shall submit results from an independent laboratory verifying that the grates meet the requirements given in AASHTO M 306, for "Proof Load Testing". TRENCH DRAINS 422

Grate retaining devices shall not obstruct the flow of water into the channel or through the channel. A grate shall fit into the frame without rocking. It shall be held in place by stainless steel tamper resistant locking devices. The Contractor shall submit results from an independent laboratory verifying that the grates will withstand a minimum repetitive pullout resistance of 200 pounds per foot {5 kN per meter} after the completion of 1,000 hours of salt spray in conformance with ASTM B 117. The grate retaining device shall withstand, without maintenance, cyclic vertical loads of 500 pounds {2.2 kN}. Frames shall be independent of the channel and shall be anchored into the surrounding concrete by metal extensions attached to the frame at all four corners. Rails that are cast into the concrete shall be ASTM A 36 structural steel, post fabrication galvanized per ASTM A 123.

Prefabricated drain channels shall be made from components that are anchored by the placement of concrete to encase the anchoring lugs that are integral to the channel components. The physical properties of the prefabricated drain channel shall be compatible with the physical properties of the concrete. The thermal coefficient of expansion shall be similar to that of the concrete so that separation does not occur between the prefabricated drain channel and the encasement concrete. Prefabricated drain channels shall interlock with adjoining channels.

539.03Construction Requirements

The Contractor shall submit the trench drain manufacturer’s recommendations for installation to the Engineer prior to beginning installation. This submittal shall include a quantity listing of all materials required for the construction of the trench drain. The submittal shall be delivered to the Engineer at least ten calendar days prior to beginning the construction of the trench drain. The Contractor shall resubmit the trench drain data if the submittal is determined to be inadequate. Construction shall not begin until the submittal is complete. A representative of the trench drain manufacturer shall be present to advise the Engineer of the adequacy of the first trench drain units that are installed. The installation of the trench drain units shall not begin until the manufacturer's representative is present at the site of installation. Connection to an existing structure may require the use of a transitional fitting and/or sections of pipe to provide a suitable connection without damage to the grate, drain and structure. Connections to structures shall be approved by the Engineer prior to construction. When the trench drain begins or terminates without a connection to other pipes or drainage structures, the trench drain end shall be sealed or plugged with a suitable cap as shown on the plans. The seal shall provide a waterproof connection.

Excavation shall be kept as nearly as possible to the minimum width, depth, and length shown on the plans.

Precast drains shall be installed to the lines and grades shown on the plans or as directed by the Engineer. The trench slot shall be protected during installation by a removable wood strip, heavy duty tape, or other suitable material, affixed to the slot to prevent infiltration of material into the drain. After finishing the surface, the protective covering shall be removed and any debris that entered the trench shall be removed.

The furnishing and placement of the concrete shall be in accordance with the requirements given in Section 501. The prefabricated trench drain components shall be supported or held in place in such a manner as to permit flow of the concrete backfill material around the drain. The concrete encasement adjacent and beneath the drain channel shall be a minimum thickness of 6 inches (150 mm}. Drain channels shall be positioned in the excavated trench so that, when finished, the surrounding concrete backfill will encase the channel.