646NATURAL GAS LINE

540

fittings shall not be deducted from the measurement for payment along the center of the line being laid.

Fittings shall be measured individually per each fitting including bolts and gaskets as needed.

Valves shall be measured per each individually as one complete unit including a valve stem extension, where required, and a valve box.

Hot taps shall be measured individually per each hot tap performed for the various sizes and types and shall include the tapping tee and saddle when necessary to perform the hot tap.

A valve with box reset will be measured per each box reset and shall include the valve and the resetting of the valve box and cover.

A valve box reset will be measured per each box reset and shall include the resetting of the valve box and cover.

Line Stoppers shall be measured per each individually as one complete unit including installation, maintenance and removal as necessary to complete the operation.

646.05Basis of Payment

Final acceptance of this work shall be subject to approval by the Utility Company involved. Therefore, payment for this work shall not be made until the Contractor has obtained the Utility's written approval that the work performed complies with the local codes and requirements of the Utility Company.

The accepted quantity of gas main laid or re-laid shall be paid for at the contract unit price per linear foot {meter}, complete in place, which shall be payment in full for furnishing and installing pipe; including joint material, making necessary pipe connections, pipe line markers, testing, excavating, backfilling, and for all materials, tools, labor, equipment and incidentals necessary to complete the work.

The accepted quantity of gas service line laid or re-laid shall be paid for at the contract unit price per linear foot {meter}, complete in place, which shall be payment in full for furnishing and installing pipe; and joint material, excavating, backfilling, and for all materials, tools, labor, equipment and incidentals necessary to complete the work.

Fittings shall be paid for at the contract unit price for each fitting specified on the project plans and includes all labor, materials, equipment and incidentals necessary to furnish and install the size fitting required.

Valves shall be paid for at the contract unit price which shall be payment for all labor, materials, equipment and incidentals necessary to furnish and install one valve, valve stem extension, where required, and valve box.

A hot tap shall be paid for at the contract unit price which shall be payment for all labor, materials, equipment and incidentals necessary to furnish and install one hot tap including tapping valve.

Valve with box reset will be paid for at the respective contract price which shall include all labor, materials, equipment and incidentals necessary to furnish and install the valve and to reset the box complete in place. ENCASEMENT PIPE FOR UTILITIES 541

Valve box reset will be paid for at the respective contract price which shall include all labor, materials, equipment and incidentals necessary to reset the box complete in place.

Line Stoppers shall be paid for at the contract unit price for each line stopper complete in place, which shall be payment for furnishing and installation of the line stopper including all materials, tools, labor, equipment, excavation, backfilling and incidentals necessary to complete the work.

646-A ___ inch {mm} * Gas ** Laid - per linear foot {meter} 646-B ___ inch {mm} * Gas ** Relaid - per linear foot {meter} 646-C ___ inch * Fittings – per each 646-D ___ inch {mm} * Valve with Box – per each 646-E ___ inch {mm} x ____ inch{mm} * Hot Tap – per each 646-G ___ inch {mm} Steel Line Stoppers – per each 646-H ___ inch {mm} __*__ Valve with Box Reset - per each 646-J Gas _***_ – per each * Show Type: Steel; Polyethylene ** Designate One Type: Main or Service Line. *** Valve Box Reset, etc. ENCASEMENT PIPE FOR UTILITIES

649.01Description

This Section shall include the work of furnishing and installing an encasement pipe for a utility carrier pipe. An encasement pipe may be utilized as a carrier pipe as noted in this Section and when shown on the plans or directed by the Engineer. The type of installation will be based on the location of the encasement pipe. The three types of installation are designated as follows:  Type 1 - Open cut.  Type 2 - Jack and bore, or tunneling.  Type 3 - Directional drilling. The Contractor may substitute the Type 2 or Type 3 installation for the Type 1 installation if the substitution is done without extra compensation. Type 2 and Type 3 installations are intended for use under existing facilities and 0where traffic is not to be disturbed.

649.02Materials

Materials furnished for use shall conform to the requirements of Section 862, Utility Encasement Pipe and other appropriate sections of these Specifications. The size and depth of pipe shall be as shown on the project plans or as described in the project proposal.

649.03Construction Requirements

Type 1 – encasement pipe installed by open trench method complying with requirements for installation and backfill given in Section 645. Type 2 – encasement pipe installed by an approved jack and bore or tunneling procedure. Type 3 – encasement pipe installed by directional drilling. The encasement pipe shall be laid to the line and grade shown on the project plans. All pipe and other materials shall be new and unused when delivered and shall be suitable for installation and operation under the condition for which they are intended. Any material that has mixed with or coated with dirt or foreign substances or damaged during its delivery or handling shall not be used. Encasement pipe for a gas carrier pipe shall have two vent pipes installed to allow for release of gas in the event of a leak. The vents shall be installed within 1 foot {0.3 m} of the end of the encasement ENCASEMENT PIPE FOR UTILITIES 542

pipe. The vent located on the low end of the encasement shall be installed on the underside of the encasement and the vent located at the high end of the encasement shall be installed on the top of the encasement. The vent pipe shall slope upwards away from the encasement. The vent pipe shall be above ground unless otherwise noted on the project plans.

The procedure for excavating and backfilling by the open cut method shall be as prescribed in

The Contractor shall submit the procedure proposed for the Type 2 installation (jack and bore, or tunneling) to the Engineer at least 7 calendar days prior to the beginning of the installation. The Engineer will not approve the submittal but will review it for completeness. Work shall not begin until the Engineer informs the Contractor that the submittal is complete. The submittal shall contain a list of all equipment proposed for use and a description of the procedure proposed for installation. The encasement pipe shall be installed simultaneously with the boring action. The results of this procedure shall produce a neatly installed encasement pipe without damage to the existing facility (roadbed, slopes, etc.) and without excessive voids in the earth surrounding the encasement pipe. If there are indications that voids exist around the encasement, the Engineer will order the Contractor to pump a concrete grout under pressure to seal the voids. Any damage to the facility caused by the installation operation shall be restored by the Contractor to the satisfaction of the Engineer without cost to the Department or Utility.

Encasement pipe spacers shall be used to maintain separation of the encasement pipe and the carrier pipe to ensure stability of the carrier pipe. Spacers shall be either stainless steel or non- metallic as approved by the Engineer and shall be installed in accordance with the manufacturer’s recommendations.

End seals shall be mechanically attached to the ends of the encasement pipe and to the carrier pipe to prevent the entrance of dirt and water into the encasement pipe.

High density polyethylene (HDPE) pipe installed by the directional drilling method shall be as specified in Section 862. The HDPE pipe shall meet the requirements for the depth of embedment and loading. Steel encasement pipe installed by directional drilling shall meet the requirements given in Section 862. Steel encasement pipe for gas that is installed by directional drilling as a carrier pipe shall meet the requirements for gas pipe given in Section 861. The Contractor shall submit to the Engineer the details of the procedure and equipment proposed for the directional drilling at least 7 calendar days prior to beginning the drilling. The directional drilling procedure shall produce a neatly installed carrier pipe without damage to the existing facility (roadbed, slopes, etc.) and without excessive voids in the earth surrounding the pipe. If there are indications that voids exist around the pipe, the Engineer will order the Contractor to pump under pressure a concrete grout to seal the voids. Any damage to the facility caused by the installation operation shall be restored by the Contractor to the satisfaction of the Engineer without cost to the Department or Utility. Installation of the pipe shall meet the requirements of ASTM F 714. Joining of the HDPE pipe shall be performed by thermal butt-fusion in accordance with the pipe manufacturer’s recommendations. The piping shall be assembled in a manner that does not obstruct adjacent roadways or public activities. The pipe installed by the directional drill method shall be to the alignment and grade shown on the project plans. The Contractor shall provide a record drawing showing the constructed horizontal and vertical alignment shown for intervals not exceeding 30 feet {9.0 m}. The Contractor shall perform the construction in a manner so that the drilling fluids and cuttings are contained and not released into waterways or their tributaries. The Contractor shall handle the HDPE and steel pipe in a manner that will not over stress the pipe at any time before, during, and after construction. A sizing pig shall be used to determine the presence of buckles, dents, out of roundness,