Section 02624 EXISTING UTILITIES

Section 02624

_{EXISTING UTILITIES}

PART 1 - GENERAL

1.1 THE REQUIREMENT

A. Utilities that cross an OCSD facility, sewer trench or similar excavations shall be protected in place, removed and reconstructed, or abandoned as indicated in the Contract Documents.

B. Procedures:

1. The CONTRACTOR shall notify the utility owner 48 hours in advance of the crossing construction and shall coordinate the construction schedule in accordance with the utility service requirements.

2. The CONTRACTOR shall not interrupt the utility service function, disturb the support base, or modify any facility without authority from the utility owner or the ENGINEER.

3. The utility owner shall have access to the work site as necessary.

4. The CONTRACTOR shall immediately notify the ENGINEER and utility owner if any utility is disturbed or damaged during the course of the Work. The CONTRACTOR shall bear the costs of repair or replacement of any marked utility where damage was caused by the CONTRACTOR's activities.

5. Notify the ENGINEER immediately of the discovery of any utility that was omitted from the Drawings, incorrectly shown or not properly marked. If a utility does not provide location information or marking services in the field, the CONTRACTOR shall immediately notify the ENGINEER. Follow the procedures as specified in the General Requirements and Additional General Requirements.

1.2 RELATED WORK SPECIFIED ELSEWHERE

A. The requirements of the following sections and divisions apply to the Work of this section. Other sections and divisions of the Specifications, not referenced below, shall also apply to the extent required for proper performance of this Work.

1. Section 01722, Protection of Adjacent Construction

2. Section 02050 Demolition

3. Section 02200, Earthwork

4. Section 02278, Abandonment of Pipe and Structures

1.3 CONTRACTOR SUBMITTALS

A. General: Submittals shall be made in accordance with the General Requirements, Additional General Requirements, and as specified herein.

B. Work Schedule: The CONTRACTOR shall submit a complete coordination schedule for demolition work, including shut-off and continuation of utility services, with the ENGINEER’S acceptance prior to start of the Work. The schedule shall indicate proposed methods and operations of facility demolition, and provide a detailed sequence of demolition and removal work to ensure uninterrupted operation of occupied areas.

C. The CONTRACTOR shall submit for review to the ENGINEER the methods, materials, and procedures to be used for demolition and replacement of the related utilities including a detailed layout for the existing and the new facilities. The layout drawings shall indicate the method of supporting the utility across the excavation and the materials used for support stability.

D. Material of Construction: the CONTRACTOR shall submit shop drawings for all the materials to be utilized in the replacement including catalog cuts and data sheets for pipes, fittings, connections, adaptors, valves…etc.

1.4 REFERENCE SPECIFICATIONS, CODES, AND STANDARDS

A. All Work specified herein shall conform to or exceed the applicable requirements of the referenced portions of the following publications to the extent that the provisions thereof are not in conflict with other provisions of these Specifications.

B. Comply with the applicable editions of the following codes, regulations, and standards.

1. Industry Standards:

SSPWC Section 5 “Green Book,” Standard Specifications for Public

Works Constructions, Utilities

C. Comply with applicable reference Specifications as directed in the General

Requirements and Additional General Requirements.

PART 2 - PRODUCTS – NOT USED PART 3 - EXECUTION

A. Protect in Place:

1. As indicated on the Drawings or directed by the ENGINEER, the CONTRACTOR shall protect the utility in place and maintain the utility in service. A utility may only be removed with written permission from the ENGINEER.

2. All existing pipelines and other utilities shall be supported across the excavation as shown on the accepted by the ENGINEER shop drawings. Supporting structures shall end at a pipe joint to ensure flexibility at the end of the support. The primary purpose of the support is to prevent settlement of the utility after construction.

3. Compaction: The CONTRACTOR shall take special precautions to compact under and around the utility to ensure that no voids exist.

B. Remove and Reconstruct:

1. Where indicated on the Drawings or as directed by the ENGINEER, the CONTRACTOR shall remove the utility and reconstruct it with new materials. The CONTRACTOR shall take appropriate measures to provide temporary service for the disconnected utility. All reconstruction work shall be with new materials of the same size, type, and quality as those removed.

2. For sewer pipe 4 to 12 inches in diameter, replacement shall consist of at least two lengths of PVC to Section 15064: Pipe: Plastic, of these Specifications.

3. Compaction: Prior to replacement of the utility, the trench shall be backfilled and compacted as specified in the Contract Documents by approved means to an elevation (1) foot above the top of the utility. A cross trench of the proper width shall be excavated for the utility and it shall be laid, backfilled, and compacted as specified in Section 02200, Earthwork, of these Specifications or as directed by the ENGINEER.

C. Abandoned Utilities:

1. Interfering portions of abandoned utilities shall be removed and disposed of as unsuitable material. The cut ends shall be plugged with brick and mortar or concrete to a thickness of 18 inches, unless otherwise specified.

2. Interfering portions of abandoned asbestos cement pipe shall be removed and disposed of as described in Section 02050, Demolition.

D. Alternative Construction - Sand Slurry:

1. Sand slurry consisting of one sack (94 pounds) of Portland cement per cubic yard of sand and sufficient moisture for workability may be substituted for other backfill materials to aid in reducing compaction difficulties. Specific methods and procedures shall be submitted to the ENGINEER for approval prior to construction.