EXISTING FACILITIES

PART 1 – GENERAL A. Description

This section includes requirements for connection to and abandonment of existing water facilities.

B. Related Work Specified Elsewhere 1. Protecting Existing Utilities: 02222.

2. Trenching, Backfilling, and Compacting: 02223.

3. Chlorination of Water Mains for Disinfection: 15041.

4. Hydrostatic Testing of Pressure Pipelines: 15042.

5. Manual Valves: 15100.

C. Location

1. The contractor shall be responsible for potholing and determining in advance the location and elevation of all existing pipelines to which connections are to be made.

Discrepancies shall be reported to Mesa Water and/or design engineer, prior to the fabrication of, or purchase of material affected by the discrepancy.

2. The contractor shall notify Underground Service Alert of Southern California (Dig Alert) at least two working days prior to construction at 1-800-422-4133.

D. Condition of Existing Facilities

Mesa Water does not warranty the condition, size, material, and location of existing facilities.

The contractor shall be responsible for verifying the properties of the existing pipe that will be connected to the proposed piping.

E. Protection of Existing Utilities and Facilities

1. The contractor shall be responsible for the care and protection of all existing sewer pipe, water pipe, gas mains, culverts, power or communications lines, sidewalks, curbs, pavement, or other facilities and structures that may be encountered in or near the area of the work.

2. It shall be the duty of the contractor to notify Underground Service Alert (USA) and each agency of jurisdiction and make arrangements for locating their facilities prior to pipeline construction.

support any utilities which will become exposed during excavation or that which are vulnerable to failure due to unsupported trenches or other construction activity.

4. In the event of damage to any existing facilities during the progress of the work and of the failure of the contractor to exercise the proper precautions, the contractor will pay for the cost of all repairs and protection to said facilities. The contractor's work may be stopped until repair operations are complete.

F. Protection of Landscaping

1. The contractor shall be responsible for the protection of all the trees, shrubs, irrigation systems, fences, and other landscape items adjacent to or within the work area, unless they are directed to do otherwise on the plans.

2. In the event of damage to landscape items, the contractor shall replace the damaged items in a manner satisfactory to Mesa Water, the owner, or the jurisdictional agency in control, or pay damages to the owner as directed by Mesa Water. The contractor shall verify that any damaged or renovated landscaping shall be replaced with landscaping that meets the current and applicable local landscape standards, codes, and ordinances, including but not limited to AB 1881 (Water Efficient Landscape Ordinance).

3. When the proposed pipeline, vault facility or other appurtenances are to be within planted or other improved areas in public or private easements, the contractor shall restore such areas to the original condition after completion of the work. This restoration shall include grading, a placement of 5 inches of topsoil, resoding, and replacement of all landscape items indicated. All irrigation facilities shall be restored/replaced to a condition equal to or better than existing per the manufacturer’s recommendations and/or industry standards.

4. If the contractor does not proceed with the restoration after completion of the work or does not complete the restoration in a satisfactory manner, Mesa Water reserves the right to have the work done and to charge the contractor for the actual cost of the restoration including all labor, material, and overhead required for restoration.

G. Permits

All work shall conform to the specifications and requirements of the city having jurisdiction, the County of Orange, CALTRANS or other affected agencies involved. The contractor shall keep a copy of all required permits at the job site and comply with all the terms and conditions of said permits.

PART 2 – MATERIALS

All materials used in making the connection or removing the facility from service shall conform to the applicable sections of these specifications.

EXISTING FACILITIES 01045 - 2

MESA WATER DISTRICT

Grout shall consist of Portland cement and water or of Portland cement, sand, and water; and all grout mixtures shall contain 2% of bentonite by weight of the cement. Grout shall be a pump mix with a minimum of six sacks cement (564 lbs) per cubic yard.

Portland cement, water and sand shall conform to the applicable requirements of Section 03300 (Concrete), except that sand to be used shall be of such fineness that 100% will pass a standard 8-mesh sieve and at least 45%, by weight, will pass a standard 40-mesh sieve.

B. Concrete

Concrete used for the replacement of damaged or removed facilities shall be in accordance with Section 03300 (Concrete) and shall match the mix design of the existing facility and per the requirement of the jurisdictional agency.

PART 3 – EXECUTION

A. Connection to Existing Water Lines

1. Notification: The contractor shall give Mesa Water a minimum of five (5) working days notice before the time of any proposed shutdown of existing mains or services.

2. Notice to Proceed: Connections shall be made only in the presence of Mesa Water Representative and no connection work shall proceed until the Mesa Water Representative has given notice to proceed.

3. Material: The contractor shall furnish all pipe and materials including as may be required: labor and equipment necessary to make the connections, all required excavation, backfill, pavement replacement, lights and barricades, water truck, highline hose, and fittings for making the connections. In addition, the Contractor shall assist Mesa Water in alleviating any hardship incurred during the shutdown for connections.

4. Temporary Work: Where connections are made to existing valves, the Contractor shall furnish and install all temporary blocking, steel clamps, shackles, and anchors as required by the Mesa Water Representative. Valve boxes and covers shall be replaced and adjusted to the proper grade in accordance with Section 15100 (Manual Valves).

5. Dewatering: The contractor shall dewater existing mains, as required, in the presence of the Mesa Water Representative. The dewatering shall be discharged to a sewer system, unless the Contractor has obtained a NPDES Permit for discharge to a storm drain. Prior to using existing sanitary sewer systems for disposal, the contractor shall obtain written permission of the owner of the sewer. The contractor will need to coordinate this disposal with the sewer agency in order to schedule the disposal as well as confirm that the sewer system has adequate capacity to handle the dewatering rate. Obtain a permit, if required, and meet all permit requirements. The contractor

commencing the activity.

6. Inadequate Progress: If progress is inadequate during the connection operations to complete the connection in the time specified, the Mesa Water Representative shall order necessary corrective measures. All costs for corrective measures shall be paid by the contractor.

7. Tapping Sleeves and Valves: Tapping sleeves and valves shall be installed in accordance with Section 15100 (Manual Valves). Tapping connection can be made to the existing water main while it is either in service or shut down depending on Mesa Water’s prior direction. A tapping valve shall be used when the existing main is maintained in service during the connection.

8. Connections: Connections shall be made with as little change as possible in the grade of new main. If the grade of the existing pipe is below that of the new pipeline, a sufficient length of the new line shall be deepened so as to prevent the creation of any high spot or abrupt changes in grade of the new line.

Where the grade of the existing pipe is above that of the new pipeline, the new line shall be laid at specified depth, except for the first joint adjacent to the connection, which shall be deflected as necessary to meet the grade of the existing pipe. If sufficient change in direction cannot be obtained by the limited deflection of the first joint, a fitting of the proper angle shall be installed.

Where the connection creates a high or low spot in the line, a standard air release or blow-off assembly shall be installed as directed by the Mesa Water Representative.

9. Connection Planning: Connections shall be initiated, scheduled, and coordinated with Mesa Water’s field representative. All connections shall be planned and implemented with sufficient time allowances to complete the work within a standard 8-hour work day. Connections that require a main line shutdown shall be coordinated a minimum of five (5) working days in advance with Mesa Water’s representative.

10. Testing: The new pipeline shall NOT be connected to an existing facility until the new pipeline has successfully passed all pressure and water quality tests following disinfection in accordance with Section 15041 (Chlorination of Water Mains for Disinfection) and Section 15042 (Hydrostatic Testing of Pressure Pipelines).

B. Removal from Service of Existing Mains and Appurtenances

1. General: Existing mains and appurtenances shall be removed from service at the locations shown on the plans or as directed by the Mesa Water Representative.

2. Method of Abandonment: Existing pipe and appurtenances shall be abandoned by the following methods. In all cases, backfill and repair of surface shall be in accordance with Section 02223 (Trenching, Backfilling, and Compacting).

EXISTING FACILITIES 01045 - 4

MESA WATER DISTRICT

Sealing

a. Abandonment by Sealing: Pipe section shall be cut and sealed solid with concrete to a depth of not less than one pipe diameter, forming a solid waterproof plug completely bonded to the pipe.

b. Abandonment by Grout Filling: The abandoned pipe section shall be grout filled by pumping a one-sack sand cement slurry mixture into the pipe. The pipe shall be completely filled, leaving no voids or air space.

The grout shall be pumped into the pipe from the inlet end to the receiving end (exit end). Samples of the outgoing water (at exit end) shall be made until the exiting grout mix is observed as similar to the grout being injected at the inlet end. The cost of the testing, including labor and testing equipment shall be provided by the contractor. The grouting plan, including the grout mix design shall be reviewed and approved by the Mesa Water Representative prior to initiating the work.

c. Abandonment by Removal: Removal of existing pipelines shall mean complete removal of the existing pipeline and disposal of the pipe and appurtenances designated as unsalvageable. Contractor is responsible for disposal of all pipe materials and associated costs.

Where connections or stub-outs are abandoned, all valves shall be removed and the remaining flanged fitting shall be closed/plugged using a blind-flange fitting and thrust block.

3. Storage of Removed Material: Removed pipe and appurtenances may be temporarily stockpiled on the job in a location that will not disrupt traffic or be a safety hazard. In all cases the contractor shall be responsible for the final disposal of all removed materials, including asbestos cement pipe.

4. Asbestos Cement Pipe (ACP): Asbestos cement pipe shall be removed at the joint or fitting, and disposed of in a proper manner. If field cutting of ACP is required by Mesa Water, the removal shall be performed by a contractor registered by CAL/OSHA and certified by the State Contractors Licensing Board for asbestos removal. Snap cutting of the ACP per OSHA requirements will be allowed. The

disposal site.

5. Maintenance of Service: Prior to performing any work to replace existing pipes and/or services, the contractor shall make proper provisions for the maintenance and continuation of service as directed by the Mesa Water Representative.

6. Abandoned Water Services: For a water service to be considered abandoned, all surface fittings, meter, meter box and customer service valves shall be removed.

As directed by Mesa Water, the service line and corporation stop shall be removed and the service saddle plugged with a brass (with no lead) plug or its service saddle and corporation stop removed and the tap plugged with a repair clamp. If there is no corporation stop on the service, the adapter shall be removed and a brass plug installed in the service saddle. If the water service is a direct tap, the corporation stop shall be removed and a repair clamp shall be installed.

7. Abandoned Meter Vaults, and Other Structures: For meter vaults, PRV vaults, and other structures to be abandoned, the top hatch or covers, cover slab or hatch or box grade ring, manhole/vault grade rings and other structural elements shall be removed and properly disposed of.

All portions of the vault or structure to be abandoned shall be removed to a point six (6) feet below finished ground surface. The remaining portions of the vault shall be filled with one-sack sand cement slurry. Sufficient quantity of holes shall be provided through the bottom of the vault to allow for water to drain out of abandoned structure.

8. Contractor shall record all abandonment, tie-ins and revision to existing facilities and submit this information to Mesa Water and the design engineer to be incorporated into the Record Drawings.

C. Cutting and Restoring Street Surfacing

1. In cutting or breaking up street surfacing, the contractor shall not use equipment that will damage adjacent pavement.

2. All asphalt and/or Portland cement concrete surfaces shall be scored with sawing equipment of a type meeting the approval of the jurisdictional agency or Mesa Water;

providing however, that any cement concrete base under an asphaltic mix surface will not be required to be scored by sawing. Existing paving surfaces shall be saw cut back beyond the edge of the trenches to form neat square cuts before repaving is commenced.

3. Pavement, sidewalks, curbs, or gutters removed or destroyed in connection with performance of the work shall be saw cut to the nearest score marks, if any, and shall be replaced with pavement sidewalks, curbs, or gutters of the same kind, or better by the Contractor in accordance with the latest specifications, rules, and regulations and subject to the inspection of the agency having jurisdiction over the street or highway.

4. Aggregate base shall be placed beneath the restored pavement to the thickness required by the agency having jurisdiction.

EXISTING FACILITIES 01045 - 6

MESA WATER DISTRICT