rfb_13199_utility_plans_SDG&E_transmission_TL6926.pdf

CONSTRUCTION PACKAGE

PROJECT NAME: TL6926 COLE GRADE ROAD KEYS CREEK BRIDGE 69KV

UNDERGROUND TRENCH & SUBSTRUCTURE REV01

WORK ORDER NO.: 2902140 BUDGET NO.: 09132

CONSTRUCTION PACKAGE

TABLE OF CONTENTS

1. SUPPLEMENTAL SPECIFICATION

2. LIST OF DRAWINGS

3. LIST OF SPECIFICATIONS

4. LIST OF OWNER PROVIDED MATERIALS

5. DRAWINGS AND SPECIFICATIONS

6. APPENDIX A: GEOTECHNICAL REPORT

SUPPLEMENTAL SPECIFICATION

SAN DIEGO GAS & ELECTRIC

TRANSMISSION ENGINEERING

SUPPLEMENTAL SPECIFICATION

FOR WORK ORDER NO. 2902140

TL6926 COLE GRADE ROAD KEYS CREEK BRIDGE 69KV

BUDGET NO. 09132

June 6, 2024

Prepared By: _________________________________ ______________

Landon Gastelum, E.I.T. Date

Engineer, UG Transmission – NV5

Reviewed By: _________________________________ ______________

Josh Fisher, P.E., P.M.P Date

Senior VP, Transmission and Distribution – NV5

Approved By: _________________________________ ______________

Vinh Huynh, P.E. Date

Principal Engineer, SDG&E

06/13/24

06/13/24

06/13/24

Landon Gastelum, E.I.T. Date

Engineer, UG Transmission – NV5

Josh Fisher, P.E., P.M.P Date

Senior VP, Transmission and Distribution – NV5

1.0 PROJECT DESCRIPTION

2.0 GENERAL INSTRUCTIONS TO BIDDERS

2.1 Inspection of the Work Areas

2.2 Contractor’s Proposal

2.3 Unit Price List

3.0 WORK INCLUDED IN THIS PROJECT

4.0 WORK NOT INCLUDED IN THIS PROJECT

5.0 CONSTRUCTION SCHEDULE

6.0 SPECIAL PROVISIONS

7.0 ENVIRONMENTAL CONSTRAINTS

8.0 ENGINEERING DATA

8.1 General

8.2 Correspondence

8.3 Review of Engineering Data

8.4 Drawings

8.4.1 Drawing Submittal

8.4.2 Drawing Processing

8.4.3 Final Drawings

9.0 EARTHWORK AND TRENCHING TECHNICAL SPECIFICATION

9.1 General

9.2 Sheeting and Shoring

9.3 Removal of Water

9.4 Blasting

9.5 Classification of Excavated Materials

9.6 Test Reports

9.6.1 Geotechnical Reports (as available)

9.6.2 Environmental Analysis Reports (if required)

9.7 Preservation of Trees and Plants

9.8 Maintenance of Traffic

9.9 Protection of Underground Construction

9.10 Unauthorized Excavation

9.11 Testing

9.12 Site Preparation

9.13 Substructure Excavation

9.14 Substructure and Trench Sub-grades

9.15 Substructure Backfill

9.16 Soil Backfill

9.17 Duct Bank Trench Excavation

9.17.1 Alignment and Grade

9.17.2 Limiting Trench Widths

9.17.3 Mechanical Excavation

9.17.4 Trench Depth

9.18 Existing Underground Installation

9.19 Temporary Plating of Trench

9.20 Duct Encasement

9.20.1 Placement, Compaction, and Consolidation

9.21 Pavement Removal and Replacement

9.22 Maintenance and Restoration of Fills, Embankments, and Backfills

9.23 Final Grading

9.24 Disposal of Materials

9.25 Warning Tape

9.26 Freezing Weather Restrictions

9.27 Soils Contaminated with Petroleum Hydrocarbons

9.27.1 General

9.27.2 Notification to Owner

9.27.3 Engineering Controls for Stockpiled Soil

9.27.4 Handling

9.27.5 Disposal of Soils Contaminated with Petroleum Hydrocarbons

9.27.6 Waste Characterization

10.0 DUCT SYSTEM TECHNICAL SPECIFICATION

10.1 General

10.2 Codes and Standards

10.3 General Installation Requirements

10.4 Electrical Conduit System

10.4.1 Plastic Conduit

10.4.2 Plastic Conduit Caps

10.4.3 Conduit Supports

10.5 Manhole Installation

10.5.1 Erection

10.5.2 Grout

10.5.3 Coordination

10.5.4 Grounding

10.6 Duct Bank Installation

10.6.1 Testing and Cleaning

10.6.2 Tolerances

10.7 Underground Conduit Crossings

11.0 FINAL CLEANUP

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1.0 PROJECT DESCRIPTION

This project installs approximately 1080 feet of 69kV underground double-circuit duct package for TL6926 between existing vaults U123337 and U123338. The alignment begins by intercepting the existing TL6926 package, including conduit stubs, (7-6” and 2-4” PVC conduits) located at the intersection of Cole Grade Road and Cool Valley Road. The alignment proceeds north along Cole Grade Road through a designated cell in the County of San Diego’s future bridge crossing over Keys Creek, where it will continue until intercepting the existing TL6926 duct package (7-6” and 2-4” PVC conduits) located near the intersection of Cole Grade Road and

Hilldale Road. All proposed work will be completed within County of San Diego franchise limits.

2.0 GENERAL INSTRUCTIONS TO BIDDERS

2.1 Inspection of the Work Areas

Prior to submission of a proposal, the Contractor shall be deemed to have made a careful inspection of the Project Specifications, drawings, and other documents; the route and right-of-way; and all other matters, such as access, storage sites and specific equipment requirement, that may affect the Contractor’s costs and the time required to complete the

Work.

2.2 Contractor’s Proposal

Contractor’s proposal should include specific Contractor and Subcontractor credentials, including but not limited to the following:

• A list of projects completed during the previous five years, including an owner’s contact person for each project listed

• Annual Reports

• List of Contractor owned equipment

• Resumes for Key Project personnel

• List of subcontractors to be used

The proposal shall also include a detailed description of the work sequence and the construction schedule.

2.3 Unit Price List

The work is based on a lump-sum fixed-price contract. The Unit Price List to be provided by the Contractor in this section is for reference purposes. The quantities of units necessary to complete the work shown on the Unit Price Breakdown are estimated quantities only. The actual work completed may be more or less than the quantities shown in the breakdown.

The Unit Price List for SDG&E furnished materials shall include unloading, storing, pick-up, and hauling to job site. Protection of SDG&E furnished materials is the responsibility of the Contractor until completion and final acceptance of the project by

SDG&E.

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3.0 WORK INCLUDED IN THIS PROJECT

The Contractor shall furnish, at its own cost and expense, all labor, materials (except as furnished by SDG&E), transportation, equipment, tools and other appliances required to perform and finish all of the work as detailed in the project drawings, specifications, and documents. A brief summary of the MAJOR items of work follows:

1. Install approximately 1080 feet of double circuit 69 kV duct package (including 90’ through bridge) consisting of seven (7) 6-inch ducts and two (2) 4-inch telecommunications conduit.

2. Install 2-piece stainless steel casings at/under each proposed bridge approach slab, terminate at the inside face of the abutment backwalls, and extend 5’ past the approach slabs.

3. Install conduit spacers inside proposed bridge deck spaced no more than 5’ on center, including 2” PVC carrier duct for 4/0 ground.

4. Intercept existing TL6926 package, 1-4” PVC duct, located at the intersection of Cole

Grade Road and Cool Valley Road.

5. Intercept existing TL6926 stub out, 7-6” and 1-4” PVC ducts, located at the intersection of Cole Grade Road and Cool Valley Road.

6. Intercept existing TL6926 underground package, 7-6” and 2-4” ducts, located near the intersection of Cole Grade Road and Hilldale Road.

7. Clean and mandrel TL6926 conduit systems from existing vault U123337 to U123338 per TE-107 specifications.

8. Maintain all traffic control set-up and tear down (as required) during construction.

Contractor may be required to acquire traffic control permits and noise permits as needed for construction.

9. Repair and replace existing dirt areas, landscaped green areas, irrigation system, sidewalks, curb & gutter, fencing & asphalt access roads as well as all property affected during construction, to prior conditions, as applicable.

4.0 WORK NOT INCLUDED IN THIS PROJECT

• All 69kV underground cable installation and termination work.

• OH Transmission RFS

5.0 CONSTRUCTION SCHEDULE

Tentative Construction Start Date: To Be Determined

6.0 SPECIAL PROVISIONS

Safety and maintaining good relations with property owners are top priorities. All work shall be performed in accordance with good safety and environmental practices in conformance to all local, State and Federal Laws and Regulations. Work shall conform to the technical Standards and Specifications provided in this job package.

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This work plan should discuss the methods that will be employed to maintain personnel safety, system reliability, and production efficiency in working around the adjacent energized transmission and distribution conductors.

A pre-construction meeting will be held with SDG&E’s Field Contract Administrator (FCA), the

Contractor and SDG&E’s Major Projects and Transmission Engineering Sections to review construction schedule and scope.

The Contractor shall contact USA Dig Alert at 811 or 1-800-422-4133 prior to any digging to verify possible underground conflicts.

An overall transmission line outage plan including planned outage dates must be provided to the

California Independent System Operator (ISO) through SDG&E’s outage coordinator a minimum of four weeks prior to the start of any outages. All specific transmission line outages must be requested a minimum of 72-hours in advance from the ISO through SDG&E’s outage coordinator. In order to meet these requirements, the Contractor must submit their outage plan to

SDG&E as soon as practical but no later than five weeks prior to the start of the line outages and must submit written outage requests at least 96 hours prior to the planned start of the outage.

The Contractor shall notify SDG&E prior to start of work in order for SDG&E to contact the property owners.

The adjacent transmission and distribution lines may be energized during construction. Extra caution must be exercised by the Contractor to maintain proper electrical clearances and to follow all safety rules and regulations.

Pick-up Location for Owner Provided Materials – When the Contractor is on-site, the material will be turned over to the Contractor and the Contractor shall be responsible for the site security and the material, which has been turned over to them. At the end of the use of the lay down site, the Contractor shall be responsible for cleaning up the site and returning it to a condition acceptable to the property owner and SDG&E. The Contractor will be responsible for cleaning up debris on a daily basis and keep the premises clean, neat and in an orderly condition at all times. Vehicle maintenance will not be allowed on this lay down site or in the right-of-way.

SDG&E provided materials will be made available to the Contractor at the on-site material delivery/Marshalling Yard.

As soon as practical after the completion of Work, an inspection of the Work will be completed by SDG&E. If the Work is found to comply fully with the requirements of the Contract, it will be accepted and final payment will be made in accordance with the Contract.

7.0 ENVIRONMENTAL CONSTRAINTS

See attached environmental release, if available.

8.0 ENGINEERING DATA

8.1 General

This section covers engineering data including Contractor’s drawings, which the

Contractor shall submit to the Owner for review as required. Timely submittal of

- 4 -engineering data is essential to the scheduled progress and completion of the project and is a basic consideration of this Contract.

Engineering data covering all equipment and fabricated materials to be furnished under this Contract shall be submitted. This data shall include drawings and descriptive information in sufficient detail to show the kind, size, arrangement, and operation of component materials and devices; the external connections, anchorages, and supports required; performance characteristics; and dimensions needed for installation and correlation with other materials and equipment.

All engineering data shall be identified with the equipment or structure it represents by use of the nomenclature established by the contract documents.

8.2 Correspondence

Correspondence forwarding engineering data shall be addressed to the Owner as follows:

Original and one (1) copy to:

San Diego Gas & Electric

Transmission Engineering & Design

Attention: Vinh Huynh, P.E.

TL6926 COLE GRADE ROAD KEYS CREEK BRIDGE 69KV

UNDERGROUND TRENCH & SUBSTRUCTURE REV01

8316 Century Park Court, CP-52B

San Diego, California 92123-1582

The Contractor shall utilize the Drawing Transmittal Form, provided at the end of this section, for submittal of all drawings and data to the Owner. Entries on the form shall be consecutive such that, at the end of the project, the list contains all drawings and data submitted. The Contractor shall be responsible for accurately submittal process.

Letters of transmittal shall accompany all submittals of engineering data and shall include a list of the data included in the transmittal. Lists shall include Contractor’s drawing numbers. All correspondence shall be identified with the project name, specification number, SDG&E Work Order number, and Contractor’s order number.

All engineering data submitted, after final processing and acceptance by the Owner, shall become a part of the Contract Documents and the work indicated or described thereby shall be performed in conformity therewith, unless otherwise required by the Owner.

8.3 Review of Engineering Data

The Owner’s review of engineering data will cover only general conformity of the data to the specifications and documents, external connections, interfaces with equipment and materials furnished under separate specifications, and dimensions that affect plan arrangements. The Owner’s review does not indicate a thorough review of all dimensions, quantities, and details of the equipment, material, device, or item indicated or the accuracy of the information submitted; nor shall review by the Owner be construed as relieving the Contractor from any responsibility for errors or deviations from the requirements of the Contract Documents.

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8.4 Drawings

Drawings shall be in sufficient detail to indicate the kind, size, arrangement, weights of each component, breakdown for shipment, and operation of component materials and devices; the external connections, anchorages, and supports required; the dimensions needed for installation and correlation with other materials and equipment; and any information specifically requested as part of this projects scope of work.

8.4.1 Drawing Submittal

One reproducible of each drawing and necessary data shall be submitted to the

Owner. Print size shall not exceed 24-inches by 36-inches.

Each drawing submitted shall be clearly marked with the name of the project, the specification title, the specification number, the project equipment or structure nomenclature, and the Contractor’s name. Catalog pages are not acceptable.

If standard drawings are submitted, the applicable equipment and devices furnished shall be clearly marked.

8.4.2 Drawing Processing

A copy of each drawing reviewed will be returned to the Contractor herein.

Copies of drawings returned to the Contractor shall be in the form of a print with the Owners marking, a print made from a microfilm of the marked up drawing, or a marked reproducible print, at the option of the Owner.

When drawings and data are returned marked EXCEPTIONS NOTED, the changes shall be made as noted thereon; and one, corrected sepia reproducible shall be submitted to the Owner.

When the drawings and data are returned marked RETURNED FOR

CORRECTION, the corrections shall be made as noted thereon and as instructed by the Owner; and one, corrected sepia reproducible shall be submitted.

When a drawing is revised and resubmitted, the Contractor shall include an issue number and revision description in the drawing revision block. All revisions pertaining to that particular drawing issue shall be back circled or otherwise clearly noted on the drawing.

When the drawings are returned marked NO EXCEPTIONS NOTED or

RECEIVED FOR DISTRIBUTION, the Contractor shall submit drawings for final distribution as specified hereinafter under Final Drawings, Drawings marked RECEIVED FOR DISTRIBUTION have been filed but have not been reviewed.

Except at the Contractor’s own risk and responsibility, no work shall be performed in connection with the fabrication or manufacture of equipment and materials until the drawings and data have been reviewed by the Owner. Work may proceed on equipment and materials when the drawings and data therefore have been returned marked NO EXCEPTIONS NOTED or RECEIVED FOR

DISTRIBUTION; and when drawings have been returned marked

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EXCEPTIONS NOTED, provided the work is performed in accordance with the

Owner’s notations.

If changes are made at the project site to the equipment to correct for manufacturing errors, due to design changes, or due to wiring revisions, revised drawings indicating the changes made shall be prepared by the Contractor and submitted to the Owner.

8.4.3 Final Drawings

Upon receipt from the Owner of drawings marked NO EXCEPTIONS NOTED or RECEIVED FOR DISTRIBUTION, the Contractor shall transmit five full-size prints (blue or black line on white background) folded to 8-1/2-inches by 11-inches size along with an electronic file copy in AutoCAD, Version 2008 or newer version, of each drawing (other than catalog cuts) to the Owner for final distribution. However, if during the submittal process, the Contractor makes further changes to drawings that have been reviewed by the Owner, the changes shall be clearly marked on the drawings and the submittal process shall be repeated.

9.0 EARTHWORK AND TRENCHING TECHNICAL SPECIFICATION

9.1 General

This section covers general earthwork and includes preparation of the construction areas;

removal and disposal of debris; excavation and trenching; the handling, storage, transportation, and disposal of excavated material; sheeting, shoring, and protection work; preparation of sub-grades; dewatering; protection of adjacent construction;

backfill; temporary plating of trench; construction of fills and embankments; surfacing and grading; and other appurtenant work, all in accordance with applicable federal, state and local laws, ordinances, permits and codes.

The Contractor shall contact USA Dig Alert at 811 or 1-800-422-4133 a minimum of

48-hours in advance of earth-disturbing activities to verify possible underground conflicts. These details shall be combined with SDG&E specifications in establishment of all requirements for the project. Where conflicts exist for all non-safety related issues between the specifications in this section and SDG&E specifications TE-0100, TE-0101, and TE-0107, the specifications in this section shall govern.

The Contractor is responsible for marking out the following, but not limited to the centerline of trench, jack and bore work spaces, vault locations and excavation areas for the project route. Upon completion of the mark out, the Contractor must notify the

Owner and receive acceptance prior to starting any excavation.

A detailed description of the procedures the Contractor proposes to perform the work pertaining to each jack and bore must be submitted to the Owner thirty (30) days before each jack and bore activity begins. The Contractor must receive acceptance of the procedures prior to starting any jack and bore activities including the excavation of the bore and receiving pits.

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9.2 Sheeting and Shoring

The stability of previously constructed structures and facilities shall not be impaired or endangered by excavation work. Previously constructed structures and facilities include both structures and facilities existing when the work under these specifications begins and structures and facilities already provided under these specifications.

Adequate sheeting and shoring in accordance with OSHA regulations 29 CFR Part 1926 updated January 1, 2020 and Cal OSHA, shall be provided to protect and maintain the stability of previously constructed structures and facilities and the sides of excavations and trenches until they are backfilled. Sheeting, bracing, and shoring shall be designed and built to withstand all loads that might be caused by earth movement or pressure and shall maintain the shape of the excavation under all circumstances. Certified/stamped drawings prepared by a California registered professional engineer of all shoring details as required by OSHA shall be furnished to Owner or its representative before any excavation begins. When “sloping” of the sides of the excavation or trench is used in lieu of sheeting or shoring the name of the “Competent Person” in charge for the Contractor shall be submitted in writing to Owner or its representative before any excavation begins.

While a geotechnical survey will be provided, it is the responsibility of the Contractor to perform the necessary investigations to reduce unknowns and be prepared for changes in soil and groundwater conditions.

The use of trench boxes is acceptable.

9.3 Removal of Water

The Contractor shall provide and maintain adequate dewatering equipment to remove, treat (if necessary) and dispose of all surface and ground water entering excavations and other parts of the work. Each excavation shall be kept dry during sub-grade preparation and continually thereafter until construction to be provided therein is completed to the extent that no damage from hydrostatic pressure, flotation, or other cause shall result.

Ground water level shall be maintained at least 12-inches below the bottom of each excavation.

All dewatering procedures and plans shall be provided by the Contractor to the Owner for approval within thirty days of award of contract.

Surface water shall be diverted and prevented from entering trenches and excavations by means acceptable to Owner and the City.

The Contractor shall be required to obtain a Dewatering Discharge Permit and comply with all of its conditions.

When the water contains contaminants that prevent its treatment and discharge to the municipal sewer system, the water shall be tested for contaminants and a program developed by the Contractor and approved by the Owner for safe disposal of contaminated water at an SDG&E approved facility off site. Sampling and testing shall be performed by a qualified lab or environmental monitor designated by the Owner.

9.4 Blasting

Blasting or other use of explosives for excavation shall not be permitted.

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9.5 Classification of Excavated Materials

Classification of excavated materials shall be made as follows:

Rock: Rock shall be defined as limestone, hard shale, or similar material in masses more than ½-cubic yard in volume, or in ledges four-inches or more in thickness. Soil-like rock formations present on the site, such as lignite, clay shale, sand shale, sandstone, and siltstone, shall not be considered as rock. Boulders less than ½-cubic yard in volume shall not be considered as rock.

Earth: All material not classified as rock.

9.6 Test Reports

The Owner contracted independent laboratories to perform geotechnical testing and environmental soil analysis.

9.6.1 Geotechnical Reports (as available)

Geotechnical tests may have been performed at locations along the proposed duct route.

It is recommended the Contractor review the available geotechnical reports in preparing a proposal. The geotechnical reports are included in Appendix A of these Specifications.

9.6.2 Environmental Analysis Reports (if required)

The environmental analyses report of soil samples is included in Appendix B of these

Specifications.

Additional environmental investigation may be performed by the Owner prior to the start of Construction. Copies of these reports will also be provided to the Contractor upon award of the contract.

9.7 Preservation of Trees and Plants

Trees and tree root systems shall be preserved and protected to the greatest extent possible, unless directed by Owner. The Contractor shall also comply with additional requirements of any public agencies that have jurisdiction over the trees in the work areas.

Any planting disturbed during excavation shall be immediately replaced.

9.8 Maintenance of Traffic

The Contractor shall conduct work with as little interference as possible to traffic, Owner’s operations, and the work of other contractors. Whenever it is necessary to cross, obstruct, or close roads, driveways, parking areas, and walks, the Contractor shall provide and maintain suitable and safe bridges, detours, or other temporary expedients at his own expense. In making open cut road crossings, the Contractor shall not block more than one half of the road at any time and two-way traffic must be maintained by the use of

Contractor installed temporary lanes around the work site. Initial traffic control plans will be provided to the Contractor and approved by the appropriate jurisdictional authorities. Contractor will be responsible to have periodic traffic control plan updates and approvals which correspond with trenching progress when the City requires approval of sections at a time only, such as weekly or bi-weekly.

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All operations that will present a hazard to traffic, both pedestrian and vehicular, shall be suitably protected by use of safety barricades and warning lights. Installation of safety and warning equipment shall be sufficient to comply with governing authorities and to the satisfaction of the Owner.

The scope of this project will require construction within roadways in the County of San

Diego. Minimizing traffic impacts and maintaining public safety must be a priority at all times.

9.9 Protection of Underground Construction

The Contractor shall locate, protect, shore, brace, support, and maintain all existing underground pipes, conduits, drains, and other underground facilities which may be uncovered or otherwise affected by the work.

Contractor shall be liable for damage to any underground structures whether or not they are shown on the drawings provided.

9.10 Unauthorized Excavation

Material excavated below the bottom of concrete structures or duct encasement that shall be supported by the sub-grade shall be replaced with concrete placed monolithic with the concrete above.

9.11 Testing

All field and laboratory testing required in determining compliance with the requirements of this section and any City or other jurisdictional requirements shall be provided by the

Contractor unless specifically covered by the Owner under this specification. Laboratory testing shall be performed by an independent testing laboratory acceptable to Owner.

Field sampling shall be performed by the testing laboratory.

Field samples shall be taken at locations and depths selected by Owner and its representative. If additional field control tests are necessary, in the opinion of Owner and its representative, such tests shall be made by the Owner.

Relative density for non-cohesive compacted materials will be determined by the

Owner’s laboratory in accordance with ASTM D1556. The following tests shall be performed for trenching work.

Two tests for laboratory density (ASTM D698 or ASTM D1557) for each type of backfill material proposed. Samples of material shall be furnished to the Owner’s laboratory.

In-place field density tests at average intervals of one test per 300-feet of trench in accordance with SDG&E Specification TE-0107.

9.12 Site Preparation

Vegetation shall be preserved wherever possible. Sub-grades for permanent construction, including sub-grades for fills and embankments, shall be stripped of surface vegetation, sod debris, and organic topsoil.

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Surface vegetation shall be removed complete with roots to a depth of not less than four-inches below the ground surface, unless prohibited in certain wetland areas as described in these specifications or on the drawings. Contractor shall re-vegetate, with vegetation and restoration methods approved by SDG&E, areas that have been cleared of vegetation, as soon as the work is completed in the area. All combustible and other waste materials shall be removed from the construction areas. Open burning is not permitted.

9.13 Substructure Excavation

Excavation for substructures shall be completed to the designated lines and elevations.

Machine excavation shall be controlled to prevent undercutting the sub-grade elevations indicated on the drawings. Machinery shall not be used within three-feet of permanent structures and facilities unless approved by Owner and its representative. Only hand tools shall be used for excavation around permanent structures and facilities. The

Contractor shall be responsible for any damage and liability resulting from excavation.

Construction areas shall be kept as free as possible from obstructions. Work shall not interfere with the transportation, storage, or handling of materials. Unused excavated materials shall be hauled away to an approved disposal site, in accordance with these specifications.

Vertical faces of excavations shall not be undercut to provide for extended footings.

While the Owner will provide information gathered to date for pothole investigations performed along the route, the Contractor shall be responsible for all potholing necessary to assure that the respective areas are clear of utilities or utility substructures, and if and exist, clearances to those utilities should be established prior to any excavations. If substructures are identified as conflicting with proposed installation, the Contractor shall receive written authorization from the Owner before proceeding to construct any recommended modifications to the proposed substructure locations. The Contractor shall be reimbursed for additional potholing associated with relocated substructures including the need for groundwater dewatering and/or management of contaminated soils.

9.14 Substructure and Trench Sub-grades

Sub-grades for substructures and the bottom of trenches shall be firm, dense, free from mud, thoroughly compacted, and sufficiently stable to remain firm and intact.

When over excavation and subsequent backfill is required, trench sub-grades shall be compacted to at least 90-percent of the maximum density as determined by ASTM

D1557. The moisture content shall be +2 percent of optimum.

Sub-grades that are otherwise solid, but become mucky on top due to construction operations, shall be stabilized by reinforcing them with one or more layers of crushed rock or gravel.

The finished elevation of stabilized sub-structure and trench sub-grades shall not be above the sub-grade elevations indicated on the drawings.

9.15 Substructure Backfill

Backfill around and outside of substructures shall be seven-inches to eight-inches slump, one sack sand slurry and shall be deposited around the perimeter of the substructure

- 11 -evenly so as not to load the substructure unevenly. Backfill shall be mechanically compacted to at least 90-percent of the maximum density. The material shall be placed at optimum moisture content, +2 percent, as determined by ASTM D1557. Compaction of substructure backfill by rolling shall be permitted provided the desired compaction is obtained and damage to the structure is prevented. Compaction of substructure backfill by inundation with water shall not be permitted.

9.16 Soil Backfill

Unless otherwise described as thermal or substructure backfill, backfill shall be composed of earth only and shall not contain wood, grass, roots, broken concrete, stones, trash, or debris of any kind.

Backfill shall be mechanically compacted to a least 90-percent of the maximum density.

The material shall be placed at optimum moisture content, +2 percent, as determined by

ASTM D1557. Compaction of substructure backfill by rolling shall be permitted provided the desired compaction is obtained and damage to the structure is prevented.

Compaction of substructure backfill by inundation with water shall not be permitted.

Backfill material shall be provided by an SDG&E approved site.

No tamped, rolled or otherwise mechanically compacted backfill shall be deposited or compacted in water.

All backfill material shall consist of loose earth having a moisture content required to obtain the specified density of the compacted soil. Moisture content shall be distributed uniformly. Water added for correction of moisture content shall be distributed uniformly prior to compaction. Granular material shall be wet, not just damp, when compacted.

Particular care shall be taken to compact structure backfill beneath pipes, drives, roads, or other surface construction.

9.17 Duct Bank Trench Excavation

No more trench shall be opened in advance of duct installation than necessary to expedite the work, or as required by city or county ordinance. All local laws and ordinances shall be strictly followed and acquired by the Contractor. Special care shall be taken to ensure safety to the workers and the public and minimize public inconvenience.

The Contractor shall provide safety barricades, tape, guards, netting, steel plates or other acceptable means to safeguard the public from hazards associated with the Contractor’s work.

Trench excavation shall be open cut from the surface.

All trench excavations shall comply with OSHA regulations 29 CFR Part 1926 updated

January 1, 2020 or latest revision, and Cal OSHA. All certified/stamped drawings of shoring details as required by OSHA shall be furnished to the Owner prior to beginning work. Contractor shall also refer to SDG&E Specification TE-0107. When “sloping” of the sides of the trench is used in lieu of sheeting or shoring, the name of the “Competent

Person” in charge for the Contractor shall be submitted to the Owner before excavation begins. The Contractor shall contact USA Dig Alert at 811 or 1-800-422-4133 a

- 12 -minimum of 48-hours in advance of earth-disturbing activities to verify possible underground conflicts.

All excavated material deemed unacceptable for use or not used as fill material shall be hauled away to an approved disposal site in accordance with these specifications.

9.17.1 Alignment and Grade

Contractor shall stake the centerline of the route. The Contractor shall be responsible for maintaining the staked alignment and the elevation of each trench as shown on the drawings. The alignment and grade or elevation of each trench shall be fixed and determined by means of batter boards and offset stakes, laser beam equipment, or surveying instruments unless otherwise accepted.

9.17.2 Limiting Trench Widths

Trenches shall be excavated to a minimum width that shall provide adequate working space and pipe clearance for safe and proper duct installation, jointing, and encasement.

9.17.3 Mechanical Excavation

Mechanical equipment shall not be used in locations where its operation would cause damage to buildings, culverts, water and sewer lines, sensitive environmental resources or other existing property, utilities, or structures above or below ground. Hand excavating methods shall be used in these locations.

9.17.4 Trench Depth

Trenches shall be excavated to the depth required by the drawings.

9.18 Existing Underground Installation

The Contractor shall conduct his operations on the basis that underground installations may exist that are not indicated on the drawings.

The Contractor shall contact USA Dig Alert at 811 or 1-800-422-4133 a minimum of

48hours in advance of earth-disturbing activities to verify possible underground conflicts.

The Contractor shall be solely responsible for locating and identifying all existing underground installations such as, but not limited to, service connections, power lines, oil, water, air, and gas lines; steam lines; sewers and other drains; circulating water lines;

oil separators; septic tanks; telephone lines; electrical duct banks and raceway; or buried structures within the construction limits of the work and elsewhere where any penetration such as, but not limited to, excavation, plowing, trenching, driving of well points, or insertion of any tool or device below underground installations to damage prior to the performance of such work. Surveying shall include contacting the owners of underground utilities. Locator services and detection devices provided by the utility owners shall be utilized when such are available. The Contractor shall hand excavate and positively identify all underground installations. All information relative to the underground installations shall be recorded by the Contractor and incorporated into the field records.

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Existing underground installations within the construction limits of the work are indicated on the drawings only to the extent information on such installations has been made available to, or discovered by, the Owner in the performance of the design work.

The accuracy and completeness of this information is unknown and is presented solely to assist the Contractor in an approximate determination of underground installations.

The Owner expressly disclaims all responsibility for the accuracy and completeness of the information so indicated.

The Contractor shall be held responsible for any interruption in the service of underground facilities resulting from his operations, unless the facility owner has given specific approval for the interruption in each case.

Except where the damaged parties desire to conduct their own repair and restoration work, the Contractor shall repair and fully restore any underground facility damage during the construction period to a condition equal to or better than that which existed just prior to the time of damage. All repair and restoration work shall be done to the complete satisfaction of the facility owners and Owner at the Contractor’s expense.

The Contractor shall make his own arrangements with any jurisdictional authority requiring inspection of repaired or reconditioned utility facilities. All inspection fees applicable shall be paid by the Contractor.

Where the facility owners desire to conduct their own repair and restoration work, the

Contractor shall render all assistance to facilitate this corrective work. The Contractor shall assume all just and reasonable expenses incurred by the facility owners.

Any delay, additional work, or extra cost to the Contractor caused by existing underground installations shall not constitute a claim for increased work, additional work, additional payment, or damages.

9.19 Temporary Plating of Trench

The Contractor shall maintain traffic and access to driveways, parking facilities, sidewalks, walkways, and similar facilities to minimize inconvenience to the public at all times. Maintenance of access shall be in accordance with local requirements and the

CPUC mitigation measures. Temporary steel plates shall be utilized to maintain access where necessary to cover open trench when work is not being performed (overnight, etc.), and to maintain permit requirements. It is the responsibility of the Contractor to establish local requirements/limitations for open cut trenching, plating, and other requirements and include compliance in their proposals.

9.20 Duct Encasement

The ducts shall be encased with duct bank concrete specified in the Section 10.0 titled

Cast-in-Place Concrete below (also refer to SDG&E Specification TE-0107).

The Contractor shall locate and test sources for duct bank concrete material. These sources and test results shall be submitted to the Owner for approval prior to use.

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9.20.1 Placement, Compaction, and Consolidation

Duct bank concrete shall be placed in layers that shall prevent flotation of the conduits. Special care shall be exercised to prevent damaging the plastic conduits. Additional requirements contained in SDG&E TE-107 specification shall be followed in controlling the concrete equality and placement. If

Contractor proposes to use vibrating equipment, the Contractor shall submit the request including the equipment and process proposed to the Owner for review and approval.

9.21 Pavement Removal and Replacement

The intent of this section is to provide for the replacement of removed or damaged asphalt or concrete surfaces during construction. The replacement asphalt or concrete surface shall be equal to or better than the existing paved surface. The Contractor shall follow the appropriate jurisdictional agency’s standards. It is the Contractor’s responsibility to obtain these standards. Contractor shall also refer to SDG&E

Specification TE-0107.

All asphalt or concrete surfaces shall be saw-cut as required before excavation can begin.

All paved surfaces to be cut shall be string-lined to ensure the cut will be in a straight line. Cuts in concrete and asphalt pavement shall be no larger than necessary to provide adequate working space for proper installation of pipes, conduits, structures, and appurtenances, unless otherwise noted on the drawings. Cutting shall be started with a concrete saw and shall provide a clean groove at least equal in depth to the existing pavement. Saw-cutting shall be conducted in accordance with the BMPs specified in the

SWPPP.

Unless required otherwise by local codes or ordinances, concrete and asphalt pavement shall be removed over trenches so that a shoulder not less than twelve-inches in width is left between the cut edge of the pavement and the top edge of the trench. Gouged and scarred areas or areas of the pavement damaged by the contractor’s operation (as determined by Owner and its representative) shall be repaired by the contractor by saw cutting, removing and replacing these areas. Material and placement shall be in accordance with all applicable local ordinances. Trench width at the bottom shall not be greater than at the top. Trenches shall not be undercut.

Surfaces shall be replaced over backfilled trenches crossing surfaced areas. Temporary and permanent replacement pavement shall be in accordance with all city, county, state, and federal requirements.

The existing asphalt surface next to the area to be resurfaced shall be broom cleaned by mechanical means. The edge of the existing pavement shall be coated with tar-emulsion prior to asphalt surfacing.

9.22 Maintenance and Restoration of Fills, Embankments, and Backfills

Fills, embankments, and backfills that settle or erode within one year after final acceptance of the work, including but not limited to pavement, structures, and other facilities, that are damaged by such settlement or erosion shall be repaired by the

Contractor at the Contractor’s expense. The settled or eroded areas shall be filled, compacted, and graded to conform to the elevation indicated on the drawings or to the

- 15 -elevation of the adjacent ground surface. Damaged facilities shall be repaired in manner acceptable to Owner.

9.23 Final Grading

As each phase of construction work has been completed, all ground surface areas disturbed by construction or construction plant and operations shall be graded as required. The grading shall be finished to the contours and elevations indicated on the drawings or, if not indicated, to the matching contours and elevations of the original, undisturbed ground surface. The final grading shall provide smooth uniform surfaces and effective drainage of the ground areas. All areas shall be reestablished to a condition at least as good as what existed before start of construction. Owner will determine if this condition has been met.

Contractor shall re-vegetate areas that have been cleared of vegetation as soon as the work is completed in the area with vegetation and restoration methods approved by

SDG&E. Final grading activities shall be scheduled sequentially and logically with the installation of the trench and substructures so as to minimize disturbance to local residents and businesses.

9.24 Disposal of Materials

Surplus earth and materials not suitable for backfilling shall be removed from the site to a location approved by the Owner at the expense of the Contractor. Disposal shall be in accordance with all federal, state, and local requirements pertaining to construction landfills.

9.25 Warning Tape

Safety warning tape shall be the type and installed as indicated on the drawings.

9.26 Freezing Weather Restrictions

Backfill and fill shall not be placed during freezing weather unless acceptable to Owner and its representative. Earth material shall not be placed on frozen surfaces, and frozen materials, snow, or ice shall not be placed in any fill or backfill.

9.27 Soils Contaminated with Petroleum Hydrocarbons

9.27.1 General

The following discusses the proper onsite storage controls and the final management options for disturbed petroleum contaminated soils (excavated, graded, cuttings from boreholes, etc.). The Contractor must be prepared to encounter contaminated soils and the construction work delays associated with the requirements of safety and environmental protocols and permit requirements.

9.27.2 Notification to Owner

When contaminated soil is encountered or suspected to be encountered, the

Owner or the Owner’s representative must be notified immediately. The Owner will arrange for sampling, analysis, and approval of a proposed disposal site, as necessary.

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9.27.3 Engineering Controls for Stockpiled Soil

When contaminated soil is being excavated and stockpiled, the main concerns are the potential impacts primarily to human receptors and secondarily to the environment. The creation of contaminated soil stockpiles should be avoided whenever possible, but there may be situations in which stockpiles are necessary.

In such cases, Contractor shall implement BMPs specified in the SWPPP for stockpiling contaminated soils. These may include measures such as:

Place on an impervious surface such as heavy plastic sheeting.

Moisten to minimize dust emissions during stockpiling (no runoff is to be created during this process).

Construct and maintain the stockpile in a manner that prevents surface and rainwater from entering the stockpile and minimizes vapor emissions.

Cover the stockpile with heavy plastic sheeting to minimize vapor emissions and prevent runoff from rain (sheeting must be maintained in good condition and free from ultra violet light damage).

Remove stockpiled soil in a timely manner after excavation to avoid nuisance complaints.

9.27.4 Handling

Any stockpiled soil demonstrated by sampling and laboratory analysis, or determined by the generator to be hazardous waste, must be stored in accordance with hazardous waste regulations, and removed within 90-days of excavation.

9.27.5 Disposal of Soils Contaminated with Petroleum Hydrocarbons

Petroleum hydrocarbon contaminated soils sometimes may be disposed of at a

Class III landfill (municipal landfills). The soils must meet the acceptance requirements of that individual facility. Prior to soil transport, the municipal landfill must be notified to determine if the soils meet the acceptance requirements of that facility.

Documentation of proper disposal of the soil (bill of lading, weigh tickets, municipal landfill special manifests, etc.) must be submitted to the Owner’s field environmental representative as evidence of proper soil disposal. These records shall be kept with the specific project files.

If petroleum contaminated soils cannot go to a municipal landfill then the petroleum hydrocarbon contaminated soils may be disposed of or treated at an approved San Diego Gas & Electric permitted facility. Again, the soils to be treated or disposed must meet the acceptance requirements of the approved facility. Before any soils are transported for disposal or treatment, the disposal or treatment facility must be notified in writing. Documentation of disposal of the soil (i.e., bill of lading, weigh tickets, manifests, etc.) must be submitted to the

Owner’s field environmental representative as evidence of proper soil disposal.

These records shall be kept with the specific project files.

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9.27.6 Waste Characterization

Soil that is disturbed and accumulated at a contaminated site through excavation, drilling or other means must be characterized to determine the concentration of any contaminants for proper disposal. Examples of stockpiled soil include:

• Excavated soil from a gas or electric project.

• Excavated soil from UST removal.

• Graded soil from a substation project.

• Soil cuttings from borings or well construction.

• Imported clean soil mixed with contaminated soil.

All stockpiled soil that is associated with an unauthorized release, spill, or other release, and that is not intended to be transported offsite or is to be transported to an unregulated site, must be sampled and analyzed. Prior approval from

SDG&E’s Field Environmental Representative or Material/Waste Management

Staff must be obtained for offsite transport or reuse onsite of any soil associated with an unauthorized release, spill, or other release.

Although the Owner will generate and sign all Hazardous Waste Manifests, the

Contractor shall arrange for all transportation and scheduling of disposal at facilities approved by the Owner. The Owner requires 48-hours’ notice to complete manifests once transporter information is provided by the Contractor.

9.27.6.1 Sampling Protocol for Stockpiled Soil

Stockpiled soil that is designated for disposal to an approved permitted hazardous waste or specified waste facility, or to a treatment/recycling facility, must be sampled and analyzed in accordance with the receiving facility’s requirements.

These facilities may have different requirements. Copies of all laboratory data and hazardous waste manifests, or other transportation documents generated for the soil treatment or environmental representative as evidence of proper soil disposal shall be kept with the specific project files.

10.0 DUCT SYSTEM TECHNICAL SPECIFICATION

10.1 General

This section covers the furnishing and field installation of a duct system in accordance with these specifications and the drawings.

Duct systems shall be furnished by contractor in quantities sufficient for a complete installation as indicated on the drawings and in these specifications.

The duct system is defined to include conduit, underground duct and boxes, manholes and all materials and devices required to install, support, secure, and provide a complete system for support and protection of electrical and fiber optic conductors.

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10.2 Codes and Standards

Duct system materials and devices furnished shall be in accordance with applicable standards of ANSI, NEMA, and UL. Duct system components shall be installed in accordance with applicable requirements of the NEC. In case of conflict between the requirements of any of the above-referenced codes and standards and the requirements of these specifications, the more stringent and conservative requirements shall govern.