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City of Plymouth
W.106 WATER MAIN INSTALLATION
- GENERAL
- The Contractor shall provide knowledgeable personnel that will perform in a workmanlike manner supplying a professional installation.
- A current Certificate of Insurance, made out to the City of Plymouth, shall be on file at the City Office prior to the start of construction. This Certificate shall be in the name of the Contractor doing the actual work.
- All OSHA safety requirements shall be followed. An approved trenching and shoring program and practices, and any other applicable safety requirements shall be followed.
- DELIVERY AND HANDLING
- Pipe must be delivered to the job site by means that will not subject it to undue stress. Extra care must be taken when unloading and stringing pipe. Dumping or rolling pipe and fittings from the delivery trailer is strictly prohibited. Pipe shall be stored or strung as close to the point of final placement as is practical. Valves and fittings shall be stored in such a way as to minimize contamination such as dirt and weather. Every effort shall be made to keep all materials free from contamination.
- CONSTRUCTION SEQUENCE
- The entire sequence of connection and construction shall be scheduled by the Contractor, subject to the approval of the Water Department. The Contractor shall make arrangements to have all utilities located before construction begins.
- CONNECTIONS TO EXISTING MAINS
- All connections to City mains shall be made by the Water Department. The type of connection to be made shall be at the discretion of the Water Department. The cost for connections to City mains shall be based upon costs for materials and labor and shall be billable to the Developer.
- LAYING OF PIPE
- All water mains shall be laid with a nominal finished grade bury of sixty inches. The excavations for construction shall be of sufficient width to permit the installation to be performed in a workman-like manner. Bell holes shall be provided at each joint to permit the connection to be properly made. The trench shall be excavated to the depth required so as to provide a uniform and continuous support for the pipe on solid and undisturbed ground at every point between bell holes. If the soil at the bottom of the trench is not uniformly good, and stone, hard pan, or mud is exposed, then the trench shall be excavated 4" below grade line and bedding provided with sand or pea gravel as needed. Back filling of the trench must be done with care so that the pipe is not damaged by rocks, frozen dirt, or debris and to insure that no voids are left around the pipe. Bedding and backfill shall be in conformance with applicable provisions of Section G.211 - SPECIFICATIONS FOR GENERAL BACKFILL. Asphalt, concrete, bricks, or any other such debris from street cuts or other sources cannot be placed in the trench. Proper tools, implements, and facilities shall be provided and used by the Contractor for the safe and convenient protection of the employees and the work. All pipe and accessories shall be carefully lowered into the trench in such a manner as to protect the pipe and coatings. Dropping or dumping of pipe or accessories into the trench is prohibited. All pipe and accessories shall be cleaned and inspected before final installation. The spigot shall be centered in the bell and brought into true alignment before making the joint. Deflection of joints, if needed, shall be made after the joint is complete and cannot exceed the maximum recommendations of the Manufacturer. Care must be taken at all times to ensure that dirt and trench water do not enter the pipe. Cutting of pipe shall be done in a workman-like manner without damage to the pipe. Standard pipe cut to be inserted into a bell shall be beveled. Pipe shall be laid with the bell ends facing the direction of laying. No pipe shall be laid in water or when trench conditions or weather are unsuitable for such work. When work is stopped, a water tight plug or cap shall be installed.
- VALVES
- Valves shall be installed on a level line with the operating nut plumb. Proper support must be provided so that the valve does not hang from the pipe. Valve boxes shall be centered on the operating nut and installed plumb with the lid extending to final grade. The use of a valve box alignment device shall be required. In instances where the valve operating nut needs to be more than six feet below grade, a commercially available extension device shall be installed.
- HYDRANTS
- Hydrants shall be set plumb and to the required depth to insure proper break away function and ease of use. All hydrants shall have pre-poured concrete blocks placed behind and underneath the shoe and extending to undisturbed ground to resist movement. All hydrants shall be back filled with pea gravel to a point not less than eight inches above the drain holes. Hydrants shall be installed or turned so that 4.5" nozzle faces the street. The pipe stub connecting the hydrant to the auxiliary valve shall be a minimum of 24" long. An "out-of-service" bag or ring shall be placed on hydrants until approved for use.
- FITTINGS
- All fittings shall be installed with proper support so as not to hang from the pipe. All crosses, tees, caps, plugs, wyes, and bends 22.50 and greater shall have concrete thrust blocks or appropriate mechanical restraints placed in the proper position and extending to undisturbed ground to resist movement.
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PLYMOUTH CODE
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2003 ELECTION RESULTS
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