GENERAL PROVISIONS OF THE SPECIFICATIONS PIPELINE WORK

Transcription

1 GENERAL PROVISIONS OF THE SPECIFICATIONS PIPELINE WORK 1.00 GENERAL The work covered by these specifications shall include all necessary work required to install pipelines and appurtenances as described herein and as shown on the drawings. The Contractor shall furnish all labor, machinery, transportation and tools for the proper performance of the work. The Contractor will furnish all materials shown on drawings and required by these specifications plus pipe coating materials for field repair, disinfection chemicals and any fittings necessary to meet contingencies in the field, unless otherwise stated under Special Conditions, page G-1 or herein. Specific Brand named items will be as specified, unless equivalent material is approved by SJWC in writing. Those materials supplied by San Jose Water Company shall be picked up by the Contractor at San Jose Water Company s Stores Department located at 1251 S. Bascom Avenue, in San Jose, California. All information as to the number and locations of existing utility mains, storm and sanitary sewers, services, etc., shown on drawings, was taken from the best available sources of information, but is not guaranteed by the Owner, San Jose Water Company. The Contractor shall assume full responsibility and shall make no claim against the Owner as a result of damage to any pipe, conduits, or other structures above or below ground or for any inconvenience or added cost in performing the work, which may be attributed in any degree to accuracy of information furnished relative to the location of said structures or facilities or for the failure of the Owner to furnish any information relative thereto. Should any structure or facilities be damaged during the operation by the Contractor, he shall immediately notify the proper owners or authorities and shall arrange for the immediate repair of the same at his own expense. The Contractor shall be responsible for any damage to trees, plants, fences or other structures, or property, and shall be liable for any damages or suits resulting from his operations MAIN INSTALLATION DUCTILE IRON AND PVC PIPE 2.01 Pipe Delivery and Material Handling Prior to Installation Pipe will be furnished in 18 to 20 ft. lengths with gasketed joints unless otherwise specified on the drawings. Contractor shall no more than one week prior to installation wash each stick of pipe with a pressure washer over the entire interior length of the pipe using a wand and standoff to assure no damage to the concrete lining, and seal/cap the ends for delivery to the project site. No pipe shall be delivered to the project site for immediate installation without caps/plugs installed. Contractor is responsible to maintain a clean pipe throughout the storage and installation process. Contractor may alternatively elect to wash and cap pipe in the manner above at the jobsite for same day installation. No pipe shall be installed without first being washed and drained of residual water Trench Preparation The trench shall be excavated with an appropriate trench digging machine to the line and grade set by the Engineer. All mains 24 in diameter or larger, and all PVC piping shall be bedded on 3 of class II aggregate base material. Regardless of pipe size, if the bottom of the trench is rocky or if requested by the Engineer, a 3 bed of approved backfill material shall be tamped in place along the full length of the trench prior to placing the pipe. The Contractor shall pothole obstructions far enough in advance of the main installation (300 to 500 lineal feet) so that said object may be crossed by a gradual change in grade of main rather than through the use of multiple fittings in a restricted area. San Jose Water Company Standard Specifications Page P-1

2 Tree roots larger than 1 in diameter shall not be cut unless otherwise directed by the Engineer. The grade of the trench shall be varied, if necessary, to avoid cutting roots. Sanitary laterals, storm drain drop inlet laterals, gas lines, poles and anchors, telephone ducts, electric conduits, etc., may, in general, fall in the grade of the trench. The Contractor shall contact the jurisdictional entities involved for permission for their relocation. Repairs and replacements shall be made in a manner satisfactory to the owner of the affected utility. The Contractor shall furnish all labor and material required for their repair, relocation and/or protection. When it is necessary to construct a bench along the trench line to accommodate equipment, upon completion of the installation, the ground shall be restored to its original contours using appropriate materials and compaction. No more trench shall be opened in one day s operation than pipe can be installed therein during the day s operation unless the Engineer so authorizes. The measurement of cover over the main as shown on the drawings is from finished grade for existing streets or "top of curb" for mains installed in new unpaved streets(see plans) to the top of the main, and is not to be interpreted as trench depth referred to herein. All mains 10 (inches) and smaller in diameter shall have a minimum of 30 (inches) of vertical cover from finished grade, or 36 (inches) of vertical cover from top of curb. All pipe over 10 (inches) in diameter shall have a minimum of 36 (inches) of vertical cover, or 42 (inches) of vertical cover from top of curb. Exceptions shall be shown on the drawings or as directed by the Engineer. Services shall have a minimum of 24 (inches) of vertical cover from finished grade. No extra compensation will be made to the Contractor for any changes in line and/or grade of the main from that shown on the drawings unless such changes require the use of additional fittings or there is a grade change exceeding 18 and also exceeding 5 ft. trench depth. In no event will extra compensation be paid for changes made without written approval of the Engineer. Payment for lowering the grade of the main will be based on the length of the main affected and the additional depth to the nearest ½ ft. beyond the limits stated above. Barricades, flags, traffic cones and lights, so placed to effectively warn and protect traffic and workmen, shall enclose the site of the excavation. The type, use and placement of warning facilities shall conform to the most recent safety requirements of the jurisdictional agency involved. When required by permit, flagmen or police officers shall be used to direct traffic. At the request of the Engineer, the trench shall be bridged at roadways and driveways in a manner assuring the safety of all vehicular and foot traffic. All driveways and entrances to properties shall be replaced in kind to the satisfaction of the property owner Pipe Installation The Contractor will install the pipeline according to the final design documents provided at the time the Engineer gives Notice to Proceed. Drawings stamped FOR BID ONLY shall not be used for construction, and any costs incurred due to errors from use of drawings other than final design will be borne by the Contractor. Any significant changes between the bid and final design documents will be grounds for compensation. If additional compensation is requested due to a change in scope of work from the bid documents, a Change Order request must be submitted by the contractor upon recognition of the circumstance. The Contractor shall be aware that the pipeline is shown as complete and in a state of final installation. The Contractor is responsible for providing adequate temporary supports, anchor blocks, additional pipe restraint or other measures needed to prevent pipeline hydraulic or structural failure during construction. This includes filling of San Jose Water Company Standard Specifications Page P-2

3 the pipe during pressure testing and disinfection or when placing in-service a portion of the pipeline prior to final completion as designed. The engineer shall approve all materials used in construction. Precautions shall be taken to prevent contamination of pipe, fittings, and other materials. Pipe shall be stored so as not to accumulate mud and water and shall be brought to the jobsite as required by section All material shall be stored in a clean dry location. All pipes shall be inspected and caps/plugs removed before lowering in to the trench. Any visible evidence of contamination shall be removed and the interior shall be cleaned of any visible foreign matter. At all times during the day when not actively laying pipe in the trench and at the end of the work day, pipe shall be capped, plugged or sealed to assure no foreign material or animals enter the pipe. Canvas slings or approved lifting clamps shall be used to lower the pipe into the trench to the required line and grade. Lifting clamps are acceptable for use on DICL pipes only. No one shall walk on the outside of the pipe except when necessary and in connection with the main installation. The pipe lengths shall be placed in the trench so the weight is uniformly distributed along the bedding. There shall be a minimum 2 clearance under the bell ends. Pipe joints will be gasketed, bolted couplings, restrained joints, or flanged fittings. Pipe lengths and fittings shall be joined per the manufacturer s recommendations. Pipe connection devices shall be used as shown on the drawings and as directed by the Engineer. Upon installing the coupling in place, the bolts shall be tightened to the proper tension. After the joint has been made, the pipe shall not be moved or disturbed. Any damage to the cement lining shall be repaired as specified herein, (see Main Installation Steel, Interior and Exterior Coatings Field Application ) as applicable Restrained Joints For Ductile Iron Pipe This specification covers the use of restraining devices to prevent joint failures of ductile iron pipe, where the pipe is installed in, across, or adjacent to any existing trench or other area of fill that may jeopardize the integrity of the pipe. Unless otherwise specified by the Engineer, joint restraint shall be used at the locations and in the manner as described herein and as shown on the standard drawing, Main RPR and the project drawings. The following are definitions of terms as they apply to this specification: 1. The term trench shall mean any existing or proposed trench for a pipeline. 2. The term embankment shall mean any fill that is placed to create a berm or ramp that is higher than the surrounding area, such as a freeway approach ramp. 3. The term extent of influence is an area around an existing or proposed pipeline. The extent of influence shall extend above the pipeline and beyond the exterior of the pipeline a distance equal to half the cover on the pipeline. In the case of an embankment, the term extent of influence shall be the elevated portion of the embankment and that is within fifteen feet of the exterior slope of the embankment, as measured perpendicularly to that slope. 4. The term restrained joint shall mean a pipe joint that has been fitted with a device approved by the Engineer designed to prevent the accidental separation of the joint. Water main joints will be restrained within the extent of influence, when two or more adjacent joints of the main are within the extent of influence. All elbows, tees or other fittings normally requiring a thrust or anchor block, that fall within the extent of influence shall be restrained and the joints of the adjacent main shall be restrained as indicated above. When restrained joints are required, the total length of main with restrained joints beyond elbows, tees or other fittings normally requiring a thrust or anchor block, shall be shown on drawings or specified by the Engineer. San Jose Water Company Standard Specifications Page P-3

4 2.05 Tracer Wire and Marker Tape The Contractor shall install tracer wire on all mains and services. The wire shall be installed in such a manner as to be able to properly trace all mains and services without loss or deterioration of signal due to loss of continuity. Tracer wire installed for services and appurtenances shall be electrically bonded to the main line wire. Installation shall be per SJWC drawing titled, Tracer Wire Installation Main-TW. The Contractor will install marker tape, imprinted WATER- RESTRAINED JOINTS. The tape shall extend along the entire length of the section of pipe that is being restrained and shall be attached to the top of the pipe using duct tape or other suitable means approved by the Engineer. Care shall be taken to prevent the displacement of the tape during the backfilling operation Polyethylene Wrap For DICL Pipe Polyethylene film shall be used to encase all ductile iron pipe and all fittings to be installed. The polyethylene film shall conform to the latest Material Specification List. The polyethylene film shall be installed in accordance with the latest revision of ANSI/AWWA Specifications C105/A21.5. The film shall be installed in such a manner as to prevent contact between the backfill and bedding material and the pipe. The film is not intended to form a watertight seal, however it shall be protected from damage during installation and back fill. Any tears or punctures shall be repaired with plastic adhesive tape prior to backfilling. The sheet or tubing shall be cut to a length approximately two feet longer than the pipe section being installed. The film shall be placed around the pipe and centered so that it will provide a one-foot overlap at each joint. A shallow bell hole shall be provided at each joint to facilitate the installation of the polyethylene film. After the pipe joint is made, the film from the new section shall then be lapped over the bell to the previously installed section and secured with plastic adhesive tape. The film shall be gathered or lapped to provide snug but not tight fit around the pipe and secured in place at quarter points along the pipe section. All folds shall be made facing downward so that they will not pocket material during the backfill operation. All odd shaped fittings shall be covered using sheet film or split tubing and shall be wrapped from the bottom and secured at the edges. Tape the polyethylene together at all valve stems and other penetrations. When connecting a new DICL pipe to an existing pipe that is not wrapped with polyethylene, the polyethylene film shall extend at least two feet onto the unwrapped pipe and be secured with adhesive tape. Provide openings for all service connections, branches, laterals, etc. by making an X shaped cut in the polyethylene film. After making the connection, the film shall be closed around the fitting and secured with tape to assure protection of the ductile iron pipe. Backfill shall be free of rocks or debris that could damage the polyethylene wrap. The backfill shall be placed carefully to prevent damaging the wrap. The backfilling operation shall otherwise proceed as outlined elsewhere in these specifications Connections To Asbestos Cement Pipe All connections to or repairs of asbestos cement (A.C.) pipe shall be done using extreme care to avoid any potential health hazard. Any cuts made to A.C. pipe shall be accomplished using snap cutters or other cutting devices approved for use on A.C. pipe. Under no circumstance shall abrasive wheel cutters or other methods be used that may cause dust or asbestos fibers to become airborne. All debris from the A.C. pipe shall be removed from the job and disposed of at an approved dumpsite. Contractor shall contact SJWC for a waste generator number at for manifesting. The handling of the debris shall be in accordance with the requirements of the Environmental Protection Agency and/or all other agencies having San Jose Water Company Standard Specifications Page P-4

5 local jurisdiction over the handling and disposal of hazardous waste. The Contractor shall provide a copy of the DTSC certificate and original waste manifest within 5 working days to a SJWC Construction Supervisor for routing to Water Quality. Connections to A.C. pipe shall be made using mechanical joint fittings unless otherwise specifically noted on the drawings or elsewhere in these specifications. Fittings shall be sized to fit the O.D. of the pipe without the need for trimming or machining of the pipe Thrust Block Installation Concrete thrust blocks (bearing and anchoring) shall be installed at angle points in the line where shown on the drawings or as directed by the Engineer. The minimum size and anchoring devices of each thrust block shall be as indicated on the drawings. All bearing thrust blocks shall bear against original ground. The areas to receive the bearing blocks shall be hand dug to prevent damage to the bearing surface of the trench. All concrete for blocking shall be class C concrete as described in the Standard Specifications for the State of California, Business and Transportation Agency, Department of Transportation Backfilling Trench Backfill shall not be placed until the engineer has been given the opportunity to inspect the pipeline. Backfill material shall not be dropped directly upon the pipeline. The backfill material shall be deposited from one end of the trench uniformly on both sides of the pipe. All material placed within 6 of the pipe shall be selected pulverized material (Class II AB) free from rocks greater than 1 inches in diameter, broken pavement or organic matter. When, in the opinion of the Engineer, material excavated from the trench is unsuitable backfill or when it is required by the jurisdictional agency, suitable backfill shall be furnished and placed by the Contractor. Provision of backfill material and the disposal of excavated material shall be included in the bid price per foot of main. Where required by permit or plans, contractor may be required to backfill the trench with low density slurry backfill. Slurry backfill shall have a compressive strength between psi where called for. At locations outside the street agencies jurisdiction, backfill of selected material from the ground surface to the depth of one foot shall be compacted to produce compaction equal to or greater than that of the original ground, or to produce no less than 85% relative compaction as determined by California Test Method No. 216 (Modified Proctor Test). The Contractor will perform both field and laboratory test and inspection. All unsuitable material and excess backfill shall be removed and disposed of by the Contractor concurrently with the installation of the main Pavement Replacement Pavement replacement shall be done in accordance with the required specification and permit granted by the Public Works Department having jurisdiction. For any portion of the job where base rock is encountered, replacement shall be made in kind or as required by the jurisdictional agency involved Service Interruption The Contractor shall operate no valve, switch or other control on the existing utility system for any purpose. Consumers affected by shutdowns shall be notified by the Contractor in person or by door hanger at least 48 hours in advance of shutdown and shall be advised at the time of notification as to the probable hour service will be restored Gate Box Adjustment Gate boxes in streets shall be raised, set to grade and paved around after streets are surfaced. San Jose Water Company Standard Specifications Page P-5

6 2.13 Retirements Retirements shall be made as required at the time of the new pipeline installation and shall be considered a specific part of said installation. All openings into the retired section of pipe shall be plugged with concrete.. Piping 14 in diameter and greater within the public right of way or as called out specifically in the plans and specifications shall be completely filled with pressurized grout or lean cement Hydrostatic And Leakage Test The line shall be maintained for a minimum of 48 hours at normal pressure prior to the high pressure and leakage test. The hydrostatic and leakage test shall be combined into one operation. The line shall be tested to a pressure of 150% of maximum static pressure as shown on the Drawings or 150 p.s.i., whichever is greater, and maintained there for a period of 4 hours unless otherwise designated by the Engineer. If, after the line is completed, capped at both ends and filled with water at hydrostatic test pressure, there is evidence of a concentrated leak, blowout or failure, or the rate of leakage of the entire line exceeds 20 gallons per inch of diameter per mile of pipe, per 24 hours, the defect shall immediately be repaired by the Contractor to the satisfaction of the Engineer. The Contractor shall furnish all materials, labor and equipment necessary for testing the line. Water for testing purposes will be furnished by the Owner without cost to the Contractor. If the pressure and leakage test is to be performed prior to final completion as designed, the Contractor shall ensure that any temporary end caps or partially completed sections of restrained pipe are adequately blocked or otherwise restrained to prevent joint separation during the pressure test. Any excavation necessary to repair leaks, failures or other defects which may develop before final acceptance, including removal of backfill already placed, shall be done by the Contractor at his own expense. Material so excavated shall be replaced by the Contractor at his own expense and shall conform to the backfill section of these specifications Pipeline Disinfection, Water Sampling, Bacteriological Sampling, and Requirements Prior to connection to existing SJWC distribution system. Disinfection of water mains, water sampling, bacteriological sampling, and Tie-In to the existing SJWC distribution system shall be done in accordance with SJWC s General Provisions of the Specifications, Disinfection and Bacteriological Sampling of Mains, Facilities, and Appurtenances. All water discharges to sanitary and storm drains shall be done in accordance with SJWC s Compliance Policies WQ-5030, WQ-5040, WQ-5050, WQ-5060 and WQ-5070 with required discharge monitoring paperwork submitted to the construction department within 48 hours Record Drawings The Contractor shall submit completed Record Drawings (As-Builts) per SJWC s As-Built Requirements. The cost for As-Built drawings shall be included with the installation contract costs. Final payment will not be made until Record Drawings have been submitted and accepted by SJWC Responsibility Of Contractor The Contractor shall guarantee the performance of the pipeline for one year following completion of the work and acceptance by the Engineer. During the one-year guarantee the Contractor shall also be liable for the value of water lost and for any property damage resulting from a failure related to workmanship or material provided by the Contractor. The Contractor shall also be responsible and held accountable for any damage that occurs to materials provided by SJWC from inventory and prior to final acceptance of the installation by the Engineer. San Jose Water Company Standard Specifications Page P-6

7 2.18 Installation On Slopes The Contractor shall install earth retaining check boards in all pipeline trenches having a slope equal to or greater than 15% or as indicated on the drawings. At least one check board assembly shall be installed for each five-foot vertical drop in the grade along the pipe trench. Check boards shall be constructed of 2 x 12 boards. A minimum of 2 boards shall be installed at each location, such that the boards form a vertical height of at least 24 inches. The board shall extend a minimum of 12 inches beyond each side of the trench and shall bear against undisturbed earth. The top of the upper board shall be at finished grade. Where Class II or permeable material is required for trenching or pipe zone backfill on a slope greater than 15% contractor shall install sufficient impermeable dams within the trench line to minimize buildup of hydrostatic head in the trench due to water migration. Dams shall be constructed by placing a minimum of three linear feet of impermeable material from trench bottom to finish grade including the pipe zone. The cost for furnishing and installing the check boards and non-permeable dams shall be included in the bid price for installing the main Installation Of Valves Valves shall be of an approved make and model, as shown on the drawings or the Material Specifications List. Valves shall be anchored as shown on the drawings. Valves on restrained joint pipe shall be restrained using mechanical joint fittings with Megalugs, bolted flanges with a flange by plain end adaptor, or other restraining method approved by the Engineer. Valve stem extension shall be installed on any valve nuts that are more than 2 feet below the finish grade per Standard Drawing MAIN-VB. Valve extensions shall raise the operating nut to between from finished grade. Gate valves shall be supplied with integrated pentagon nuts, adapters shall not be allowed. Extensions shall be pentagon to pentagon except in the case of butterfly valves provided with square nuts and adapters. The Contractor shall operate all valves before installing them in the pipeline. Valves shall be operated from full closed to full open position and the total number of turns to operate the valve shall be shown on the installation Record Drawings for the job MAIN INSTALLATION STEEL The specifications for Section 2.0 Main Installation Ductile Iron and PVC Pipe shall apply to steel mains with exceptions and additions as noted herein Pipe Delivery and Material Issue Steel pipe will be furnished in up to 50 feet lengths with joints as described herein. Pipe joints will be gasketed and joints at fittings will be welded, flanged, or mechanical joints unless otherwise shown on the drawings. Coating and lining of pipe will be as shown on the drawings Trench Preparation All mains 24" in diameter or larger shall be bedded in class II aggregate base. The pipe shall be bedded in firm material along its full length and to a height 6 above the top of pipe. A 3 bed of backfill material will not be required for steel mains less than 24" in diameter unless the bottom of the trench is rocky or of such nature that the coating of the pipe will be damaged upon installation. At the request of the Engineer, the Contractor shall furnish and install the bedding. The cost for furnishing and placing the backfill material shall be included with the installation contract costs. San Jose Water Company Standard Specifications Page P-7

8 3.03 Pipe Installation If the ends of steel pipe are out of round, an expander or screw jack shall be used to bring them back to round. The pipe must be shown to hold the round shape prior to being allowed to be placed into fittings. No pipe shall be allowed to be installed in a non-stable state of roundness. No pipe end expansion will be permitted unless approved by the Engineer. All coated pipe shall be strung on sacks of sawdust if required by the Engineer. The Contractor shall furnish and place the sacks of sawdust. The Contractor shall repair all abrasions to the outside wrapping and/or coating before the pipe is lowered into the trench. Repairs and joint protection of coating and lining shall be made as specified herein Joints Bolted Coupling Bolted couplings shall be used where shown on the drawings. The pipe shall not be moved or disturbed after the joint has been made, and the bolts tightened to the proper tension. All joints shall be coated to provide protection over the joint. Pipe coating shall be applied on both sides of the coupling as required to protect areas where coating has been damaged or omitted Joints O Ring The pipes to be joined shall be placed in the trench and positioned so that the spigot end of one is in line with and facing the bell end of the other. The exterior of the spigot and the interior of the bell shall be thoroughly cleaned. The gasket shall be snapped into place in the groove, an NSF-approved lubricant as recommended by the manufacturer shall be applied to the rubber gasket and the adjoining bell or spigot, and the joint shall be completed by forcing the spigot into the bell or the bell onto the spigot. A Feeler gauge shall be inserted into the void between the spigot and bell joint and run around the circumference of each joint to insure proper seating of the gasket. The unfilled space in the interior and exterior of each steel pipe O ring joint shall be filled as specified in Joints Welded All details of procedure and methods employed in field welding of circumferential pipe joints or other connections shall be subject to the approval of the Engineer, and shall be performed as described in the latest edition of the AWWA standard for Field Welding of Steel Water Pipe Joints, C Interior and Exterior Coatings Field Application The type of interior and exterior coatings or linings shall be AWWA-approved or as specified by the Engineer. The thickness of any applied field lining shall not be less than the existing lining. All damage to the interior coating of the pipe shall be repaired in the following manner after the metal has been thoroughly cleaned of all paint, grease, rust slag and scale. Cement mortar linings damaged for an area of one square foot or less shall be replaced to the same thickness as the existing lining using ANSI/AWWA C104/A21.4 standards and pipe manufacturer's recommendations for field repair. If damage is in excess of one square foot, the damaged pipe section shall be removed as directed by the Engineer. The remaining ends shall be joined together as directed by the Engineer. The interior annular space in cement lined pipe at the O ring joint or weld joint shall be filled with a cement butter consisting of one part cement to two parts sand applied to the interior joint surface of the pipe... The excess cement shall be removed by a drag or by hand. Enough cement butter shall be used to insure that this space is completely filled. Asphalt mastic pipe coatings shall be repaired with two layers of Protecto-Wrap #200 tape, or approved equal. San Jose Water Company Standard Specifications Page P-8

9 3.08 Joints on Cement Coated Pipe All bolted couplings and flanged joints shall be covered with an approved wrap. All welded joints on cement coated pipe and all damage to the coating of said pipe shall be coated using a 1 mesh, number twenty (20) gauge stucco netting and cement mortar consisting of one part cement and three parts sand by volume applied to produce a smooth surface over the length of the joint. The cement coating shall have a minimum thickness of 1 ½ measured perpendicular to the joint or surface being coated. The coated joint shall then be wrapped with wet burlap or other suitable material to protect the coating during backfilling operations. If extensive damage is done to the coating, the pipe section shall be removed and the two ends shall be joined together, as directed by the Engineer Joints Dead End Mains On all dead end steel mains, a minimum length, as specified on the drawing, shall have all welded joints, or blocking as shown on the drawings Pipe Separation Except as shown on the plans or approved by SJWC, pipe separation between water mains and wastewater or secondary treated recycled water piping shall be in accordance with the latest Department of Drinking Water (DDW) Waterworks Standards and the California Public Utilities Commission (CPUC) General Order No. 103A. END OF SECTION San Jose Water Company Standard Specifications Page P-9