PART 1 – GENERAL A. Description
This section describes materials and procedures for protecting existing underground utilities.
B. Related Work Specified Elsewhere 1. Existing Facilities: 01045.
2. Trenching, Backfilling, and Compacting: 02223.
C. Submittals
Contractor shall submit drawings and calculations for support and protection at the pipeline crossings larger than 36-inch in diameter at least thirty (30) calendar days prior to excavation of the crossing.
D. Construction Interferences
1. As used in this Section, the word “utility” shall be understood to include tracks, overhead or underground wires, cables, pipelines, conduits, ducts, sewers, or storm drains. As used in this Section, the term “service connection” shall be understood to mean all or any portion of a pipeline conduit, wire, cable or duct, including meter, between a utility distribution line and an individual customer when served by a single service connection. As used in this Section, the term “construction interference” shall be understood to include any utility or service connection within the limits of excavation or over-excavation required for the work under the contract as shown or as ordered by Mesa Water or the design engineer, or any utility or service connection located in the space which will be required by any of the work under the contract.
2. In the event any utility or service connection is required to be disturbed or removed to permit construction of a pipeline or other structure under the contract, such disturbance or removal shall be done only with the approval of Mesa Water, and following notification to the owner of the interfering utility or service connection.
Any such utility or service connection removed or otherwise disturbed shall be reconstructed as promptly as possible in its original or other authorized location in a condition at least as good as prior to such removal or disturbance, subject to the inspection of the owner of same. The contractor’s responsibility under this Section to remove or replace shall apply even in the event such damage or destruction occurs after backfilling or is not discovered until after completion of backfilling. The owner of the utility or service connection shall be notified immediately after damage or destruction occurs or is discovered.
affected by the work shall have the right to enter when necessary upon any portion of the work for the purpose of maintaining service and of making changes in or repairs to said utility.
4. The drawings show the approximate positions of known utilities in the immediate vicinity of the work, but Mesa Water does not guarantee that all existing utilities are shown. Service connections normally are not shown on drawings. The contractor, before commencing any excavation, shall ascertain from records or otherwise, the existence, position and ownership of all existing utilities and service connections. If the contractor discovers any utility or sewer house laterals in the line of work which is not shown on the drawings, he shall immediately notify Mesa Water and the design engineer of the existence of same. Mesa Water will not be liable for any consequences arising as a result of a service connection being incorrectly located in the field by the agency having jurisdiction over said service connection.
5. All costs involved in removing, relocating, protecting, supporting, repairing, maintaining or replacing a utility which actually constitutes a construction interference, when said utility is shown on the drawings as an interference, however approximate the location shown may be, shall be borne by the contractor.
6. All costs involved in removing, relocating, protecting, supporting, repairing, maintaining or replacing a utility which actually constitutes a construction interference, when said utility is not shown as an interference or is omitted from the drawings, will be paid for by the developer/owner or by Mesa Water as extra work where Mesa Water is a party to the contract and is determined to have responsibility.
7. All costs involved in removing, relocating, protecting, supporting, repairing, maintaining or replacing a service connection larger than two (2) inches in nominal diameter which actually constitutes a construction interference, when said service connection is shown on the drawings as an interference, however approximate the location shown may be, shall be borne by the contractor.
8. All costs involved in removing, relocating, protecting, supporting, repairing, maintaining or replacing a service connection larger than two (2) inches in nominal diameter which actually constitutes a construction interference, when said service connection is not shown as an interference or is omitted from the drawings, will be paid for by the developer/owner or by Mesa Water as extra work where Mesa Water is a party to the contract and is determined to have responsibility.
9. All costs involved in removing, relocating, protecting, supporting, repairing, maintaining or replacing a service connection two (2) inches or smaller in nominal diameter which actually constitutes a construction interference, whether or not said service connection is shown on the drawings, shall be borne by the contractor.
10. The contractor shall not be assessed liquidated damages for failure to complete the work on time to the extent that such delay was caused by failure of Mesa Water or of the agency having jurisdiction over the utility or service connection to authorize or otherwise provide for its removal, relocation, protection, support, repair, maintenance, or replacement.
PROTECTING EXISTING UTILITIES 02222 - 2
MESA WATER DISTRICT
Water’s pipelines when, by so doing, the necessity for relocation of existing utilities or service connections will be avoided. Such changes will be ordered in writing by Mesa Water. Where applicable, adjustment in contract price will be on the basis on the unit prices stated in the Bidding Schedule where Mesa Water is a party to the contract.
PART 2 – MATERIALS
Except as indicated on the drawings, or as specifically authorized by Mesa Water Representative or the owner of the utility, utilities shall be reconstructed with new material of the same size, type, and original quality as that removed.
PART 3 – EXECUTION A. General
1. The drawings provide the specific pipeline protection notes required for this project.
The following requirements are general and are in addition to the specific requirements noted on the drawings.
2. Where utilities are parallel to or cross the excavation or the pipeline trench, but do not conflict with the permanent work to be constructed, follow the procedures given below and as indicated on the drawings. Notify the utility owner 48 hours in advance of the crossing construction and coordinate the construction schedule with the utility owner’s requirements. Contractor shall obtain utility owner approval before submitting shop drawings for review by Mesa Water.
3. Contractor shall determine the true location and depth of utilities, service connections and points of connections which may be affected by or affect the work. The contractor shall determine the type, material, and condition of these utilities. The contractor shall pothole all crossing utilities, closely parallel utilities and all points of connections.
B. Procedures
1. Protect in Place: Protect utilities in place, unless abandoned, and maintain the utility in service, unless otherwise specified on the drawings, or in the project specifications.
2. Cut and Plug Ends: Cut abandoned utility lines (conduits) and plug the ends with brick and mortar wall (a minimum of 8-inches thick) or concrete plug (minimum of 6-inches thick). Dispose of the cut pipe as unsuitable material.
3. Contractor shall provide temporary support for all pipelines crossing the proposed trench. All pipelines 18-inches in diameter or larger crossing over the proposed Mesa Water main with less than four (4) feet of clearance shall have a concrete support
pipelines less than 18-inches in diameter and crossing over the proposed water main with less than two (2) feet of clearance shall be protected by pouring a 1-sack sand/cement slurry from the top of the water main to the bottom of the crossing pipeline.
C. Thrust Blocks on Water Lines
The contractor’s attention is called to thrust blocks on existing water lines throughout the project area whose thrust is in the direction of the trench excavation and, therefore, may be affected by the pipeline construction. The contractor shall protect the thrust blocks in place or shore to resist the thrust by a means acceptable to Mesa Water.
If the thrust blocks are exposed or rendered to be ineffective in the opinion of the owner’s representative or Mesa Water, the contractor shall reconstruct the thrust block to bear against firm unexcavated or backfill material. Provide firm support by backfilling that portion of the trench for a distance of a minimum of two (2) feet on each side of the thrust block to be reconstructed from the pipe bedding to the pavement subgrade, with one sack sand-cement slurry. Then excavate the backfill material for construction of the thrust block.
D. Abandoned Utilities
The contractor shall remove and dispose of abandoned utilities within the trench excavation.
END OF SECTION
PROTECTING EXISTING UTILITIES 02222 - 4
MESA WATER DISTRICT