33 01 10 - Operation and Maintenance of Water Utilities.pdf

33 01 10 – OPERATION AND MAINTENANCE OF WATER UTILITIES

Herbert, Rowland & Grubic, Inc. 33 01 10 - 1 009280.0426

SECTION 33 01 10 – OPERATION AND MAINTENANCE OF WATER UTILITIES

PART 1 - GENERAL

1.1 SECTION INCLUDES

A. The installation of temporary water mains, service connections, and appurtenances to supply potable water while the permanent water system is being installed.

1.2 REFERENCES

A. NSF International

1. NSF 61 – Drinking Water System Components – Health Effects.

1.3 SYSTEM DESCRIPTION

A. The work covered by this section consists of furnishing all labor, equipment, tools, appliances, and materials necessary to perform all operations to implement a temporary bypass water system.

B. The design, installation and operation of the temporary bypass water system shall be the Contractor’s responsibility.

C. All materials furnished for use as temporary bypass pipe, service hose, connections and related appurtenances that come into contact with drinking water are to be certified for conformance with NSF 61 or NSF 14 by an ANSI approved third-party certification program or laboratory. All materials shall be fully adequate to withstand the required water pressure and all other conditions of use, and shall provide adequate water tightness before being put into service.

1.4 SUBMITTALS

A. Submit under provisions of Section 01 33 00 – Submittal Procedures.

B. Shop Drawings and Product Data: Furnish completely dimensioned shop drawings, catalog cut, or other data as required to provide a complete description of piping, fittings, valves, and other appurtenances specified herein.

C. Contractor to submit method to provide maintenance and protection during the entire length of the contract to ensure continued water service.

1.5 COMMISSIONING

A. Temporary bypass water system shall be successfully hydrostatically tested and approved by the Owner and Engineer prior to connection to the customers.

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B. Temporary bypass water system shall be disinfected, and acceptable bacteriological samples obtained and approved by the Owner and Engineer prior to connection to the customers per Section 33 13 00 – Disinfection of Water Utility Distribution.

PART 2 - PRODUCTS

2.1 GENERAL

A. Appurtenances not specified in this Section shall be in accordance with Section 33 14 13

– Public Water Utility Distribution Piping.

2.2 MATERIALS

A. Temporary Bypass Pipe:

1. High Density Polyethylene (HDPE) Pipe:

a. Polyethylene pipe shall be made from a HDPE material having a material designation code of PE 4710 and shall be NSF 61 certified.

b. The material shall meet the requirements of ASTM D3350 and shall have a minimum cell classification of 445574C and 445576C.

c. ½” – 3” pipe shall be in accordance with ASTM D3035 and AWWA C901.

d. 4” – 24” pipe shall be in accordance with ASTM F714 and AWWA C906.

e. HDPE pipe shall be a minimum SDR-13.5 and rated for use at a pressure class of 160 psi (minimum). The outside diameter of the pipe shall be based upon the IPS sizing system.

2. HDPE Fittings

a. IPS HDPE butt fusion, socket fusion, or plain end to fit HDPE Coupling, fitting materials according to paragraph 2.2.A.1 above, rate for a minimum working pressure of 160 psi.

3. HDPE Couplings (2-inch and larger):

a. Coupling shall be designed to connect plain end HPDE pipe and fittings.

b. Coupling shall meet or exceed the pressure rating of the HDPE pipe.

c. Coupling shall be constructed of the following:

i. Housing: ASTM A536 ductile iron with a fusion bonded epoxy coating.

ii. Retaining Ring: 300 series stainless steel

iii. Coupling Gasket: Nitrile

iv. Hardware: 316 stainless steel

d. Coupling shall be Victaulic Style 905 for HDPE pipe, or equal.

4. Water Service Hose (2” or smaller):

a. Water service hose to be used for connection from the temporary bypass pipe to the building/residence shall have a minimum working pressure rating of 200 psi and be made of a material that will not have an adverse effect on the taste or odor of the water.

5. Double Check Valve Assembly:

a. Double Check Valve Assembly shall be designed to prevent backflow in accordance with AWWA C510.

6. Isolation Valves:

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a. Isolation valves shall be designed to isolate the system and be either gate valves or butterfly valves. Valve operators shall be designed or locked to prevent unintended operation by individuals other than the Contractor, Owner, or Fire Department.

b. Gate Valves shall be designed in accordance with AWWA C509.

c. Butterfly valves shall be designed in accordance with AWWA C504.

7. Restrained Joint PVC Pressure Pipe and Fittings:

a. Pipe shall meet the performance requirements of ASTM D2241 and be

NSF 14 and NSF 61 certified.

b. Pipe and couplings shall be manufactured from a specially formulated

PVC compound that contains impact modifiers and ultraviolet inhibitors to give higher impact strength over an extended period of time. PVC compound shall meet or exceed cell classification 12454 per ASTM D1784.

c. Pipe and couplings shall provide a noncorrosive restrained joint by utilizing precision-machined grooves on the pipe and in the coupling that, when aligned, allow a spline to be inserted, locking the pipe and coupling together. A flexible elastomeric seal (O-ring) in the coupling provides a hydraulic seal.

d. Joints shall meet the requirements of ASTM D3139.

e. O-rings shall meet the requirements of ASTM F477.

f. Restrained joint PVC pipe shall be a minimum SDR-26 and rated for use at a pressure class of 160 psi (minimum).

g. Restrained Joint PVC Pressure Piping System shall be Certa-Lok Yelomine, or equal.

PART 3 - EXECUTION

3.1 GENERAL

A. Temporary bypass piping and appurtenances shall be disinfected and tested in accordance with section 33 13 00 – Disinfection of Water Utility Distribution prior to connection on private properties.

B. Temporary bypass system shall include temporary bypass pipe, hoses, connections and related appurtenances necessary to maintain a continuous supply of water to each single residential unit, business, or other building. A temporary bypass system shall be maintained in a safe and operative condition at all times.

C. For protection of the work and the public, flashers and barricades shall be installed at locations as determined by the Contractor. The Owner and Engineer may direct additional locations to install flashers and barricades. The flashers and barricades shall be maintained in proper operating condition.

D. To minimize interference with vehicle and pedestrian traffic, whenever the temporary bypass pipe crosses the sidewalk, the temporary bypass pipe shall be covered with a mound of asphalt material, or suitable ramps.

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E. The Contractor will not be allowed to use water for the temporary bypass pipes for any other purpose other than to supply the bypass pipes.

F. Supply and install “Out of Service” markers on all permanent hydrants while they are out of service, for the duration of the work. Maintain temporary bypass hydrants and “Out of Service” signs on the permanent hydrants until the water main and all permanent hydrants are completely installed.

G. The Contractor shall be responsible for maintenance and repair of the temporary bypass system. The Contractor shall be equipped to make all repairs necessary within 1-hours notifications for the duration of the Project. The Contractor shall provide a 24-hour emergency telephone number in case it is necessary to make any repairs.

H. The connection of single residential units, businesses, or other buildings in series is not permitted. Each temporary water service shall have its own valved connection to the temporary water main.

I. Care shall be exercised during the installation of the temporary potable water supply services to avoid contamination of these services.

J. No work shall be done during freezing weather. No temporary water mains or temporary water services shall be installed or operated during freezing weather. Pipes already in use shall be removed or drained and existing services restored when so directed by the Engineer.

3.2 INSTALLATION

A. Install the temporary potable water supply pipes as directed by the Owner or Engineer.

Changes in layout may be made with prior approval of Engineer. In general, the temporary potable water supply service pipe shall be laid where it causes the least obstruction and is least likely to be damaged. Secure bypass with suitable anchoring devices as needed.

B. The Contractor shall provide protection of the temporary potable water supply services at locations such as road crossings, sidewalks, driveways, and walkways.

C. Ramp and maintain bypass pipe at road and driveway crossings. Bury bypass pipe at depth recommended by pipe manufacture for full width of pavement. Pavement shall be neatly saw cut and removed as required and the temporary water main shall be covered. Under no circumstance is a temporary water main road crossing trench to remain open and unprotected from vehicular and pedestrian traffic.

D. When temporary potable water supply services cross a driveway or a sidewalk, asphalt or another acceptable material shall be mounded over the pipe. A polyethylene sheet shall be placed as a barrier on concrete.

E. The Contractor shall provide adequate signage at locations where hoses are exposed and may present a public safety hazard.

F. At any connection of a temporary water main to the water supply and distribution system (e.g., at hydrants) a double check valve backflow preventer shall be installed.

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3.3 TEMPORARY WATER SERVICES

A. Temporary potable water supply services for single residential units, businesses, or other buildings shall match the existing service size, however the minimum temporary water service size shall be 3/4-inch inside diameter.

B. The temporary potable water supply service connections shall be valved near the point of connection to the temporary water main and also valved near the point of connection to a private plumbing system so that both the temporary water main and the temporary potable water supply services may be disinfected.

3.4 VALVES

A. Valve shall be installed at each branch of a temporary water main and at 800-foot (max) intervals.

B. Before permanently shutting down the existing water main, the valves shall be tested to confirm that they are in proper working order.

3.5 CONNECTIONS TO EXISTING HYDRANTS

A. Flush hydrant until clear water is observed

B. Disinfect they hydrant standpipe with a concentrated chlorine solution containing not less than 200 PPM of free chlorine. Chlorine solution shall remain in the hydrant barrel for a minimum period of one hour.

C. Hydrant shall then be flushed and the bypass pipe connected to it. Support appurtenances attached to the hydrant.

3.6 REMOVAL OF TEMPORARY BYPASS WATER SYSTEM

A. Temporary Bypass Water System shall be removed once the permanent water system has been installed, tested, and approved by the Engineer.

B. All disturbed areas shall be restored in accordance with the Contract Documents.

END OF SECTION 33 01 10