PC_Comm_Tower_Tech_Specs_082225.pdf

TECHNICAL SPECIFICATIONS

COMMUNICATION TOWER UPGRADE

AUGUST 2025

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COMMUNICATIONS TOWER

UPGRADE TECHNICAL SPECIFICATIONS

TABLE OF CONTENTS

DIVISION 1 – GENERAL REQUIREMENTS

SECTION NUMBER SECTION TITLE

01010 Summary of Work 012223 Measurement and Payment

DIVISION 2 – SITEWORK

02222 Excavation 02223 Backfilling 02582 Underground Ducts and Manholes

DIVISION 3 – CONCRETE MATERIALS AND METHODS

03300 Cast-In-Place Concrete

DIVISION 16 – ELECTRICAL

16000 General Electrical Requirements 16100 Electrical Hangers and Supports 16110 Electrical Raceway Systems 16120 Wire and Cable – 600 Volt and Below 16195 Electrical Identification 16210 Electric Utility Services 16230 Standby Generators 16410 Control Panels 16450 Grounding 16500 Telecomm Rooms 16947 Fiber Optic Communications Cable 16950 Electrical Testing Requirements

END OF TABLE OF CONTENT

01010-1 Summary of Work

PART 1 GENERAL

1.1 SECTION INCLUDES

SECTION 01010

SUMMARY OF WORK

A. Summary of Work Covered by the Contract Documents

B. Summary of Work by Others in Support of the Project

C. Sequence of Construction

1.2 SUMMARY OF WORK COVERED BY CONTRACT DOCUMENTS

A. The City intends to demolish the existing Public Works Building. This building currently serves as the distribution point for the City’s IT and OT fiber optic networks, which connect to the Warehouse and Maintenance Buildings, as well as the adjacent communications tower. The communications tower also receives electrical service from this building.

B. The scope of work includes, but not limited to:

1. Installation of a new electrical service and standby generator for the communications tower.

2. Installation of a new radio cabinet to house the existing radios currently mounted on one of the tower legs.

3. Installation of new OT and IT fiber optic cabling routed through existing and new duct banks.

4. Construction of new telecommunications rooms in the Maintenance and Warehouse Buildings.

1.3 SUMMARY OF WORK BY OTHERS IN SUPPORT OF THE PROJECT

A. The City will convert an existing lavatory in the Warehouse and a storage room in the

Maintenance Building into telecommunications rooms. This work includes removal of fixtures and stored items, painting, lighting, and electrical power modifications. The City will also provide open-frame racks for these telecom rooms.

B. To support the transition from the existing to the new fiber optic networks, the City will:

1. Provide wireless communication between the Maintenance and Warehouse

Buildings.

2. Provide wireless communication from the Maintenance Building to the new radio cabinet.

3. The City will supply and install network equipment, patch cables, horizontal network wiring, and uninterruptible power supplies (UPS) in the network racks.

01010-2 Summary of Work

1.4 SEQUENCE OF CONSTRUCTION

A. The new telecom duct bank to the communications tower and Maintenance Building will intercept the existing duct bank currently running from the Maintenance Building to the Sanitation Building. This work will sever the existing fiber optic cable between the buildings. To minimize service disruption, the following tasks must be completed prior to this cutover:

1. Completion of the new telecommunications rooms.

2. Installation of fiber optic cable from the new Sanitation Building to the

Maintenance Building, and from the Maintenance Building to the Operations Building.

3. Completion of City-provided wireless communication links between the Maintenance Building, Warehouse, and communications tower.

1.5 CONSTRAINTS

A. Time is of the essence, particularly during periods of service interruption.

B. The work must be executed with minimal disruption to the City’s operational OT and

IT networks.

C. The radio communications system provides real-time monitoring and control of the City’s distribution and collection systems. Any outages must be closely coordinated with the City and shall not exceed one hour.

D. The Contractor shall allocate time in the project schedule for the City to install network and UPS equipment in the telecommunications rooms and to run horizontal cabling to work area outlets.

E. The Contractor shall also allow time for the City to establish temporary radio communications between the Maintenance Building, Warehouse, and communications tower. A one-week testing period shall be included to verify proper operation of the temporary radio system before any existing fiber optic cabling is severed.

END OF SECTION

01 22 13 - 1

SECTION 01 22 13

MEASUREMENT AND PAYMENT

PART 1 – GENERAL

1.1 DESCRIPTION

A. The following explanation of the Measurement and Payment for the bid items is provided;

however, the omission of reference to any item shall not alter the intent of the Bid Form or relieve CONTRACTOR of the necessity of constructing a complete project under this

Contract.

B. The quotations prepared by CONTRACTOR for the various items of work are intended to establish a total price for completion of the work in its entirety. Should the contractor feel that the cost for any particular work item has not been established by the Schedule of

Payment items or this section, the Contractor shall include the cost for that work in one of the bid items so the proposal for the project reflects the total cost to complete the work.

C. The CITY reserves the right to increase or decrease the quantity of any item or portion of the work during the progress of construction in accordance with the terms of the Contract.

D. Unit prices, if used, are used as a means for computing the bid, for Contract purposes, for periodic payments, for determining value of additions or deletions.

E. Payment shall be made for the items listed on the Bid Form on the basis of the work actually performed and completed, such work including but not limited to, the furnishing of all necessary labor, materials, equipment, tools, transportation, delivery, disposal of waste and surplus material, restoration and all other appurtenances to complete the construction and installation of the work as shown on the drawings and described in the specifications.

1.2 RELATED PROVISIONS

A. Payments to CONTRACTOR: Refer to General Conditions, Supplementary Conditions, and Agreement.

B. Changes in Contract Price: Refer to General Conditions and Supplementary Conditions.

1.3 SCHEDULE OF VALUES

A. CONTRACTOR shall prepare a schedule of values for review with the return of the executed agreement to CITY. The schedule shall contain the installed value of the component parts of lump sum work for the purpose of making progress payments during the construction period.

B. The schedule shall contain sufficient detail for proper identification of work accomplished.

The sum of all scheduled items shall equal the total value of the contract.

DRAFT

01 22 13 - 2

C. Unit Price Work: Reflect unit price quantity and price breakdown from the conformed bid form.

D. Lump Sum Work: Reflect Schedule of Values.

1.4 ITEM DESCRIPTIONS

A. Mobilization/Demobilization:

1. Measurement: The quantity to be paid for under this Section shall be on a lump sum basis.

2. Payment: The lump sum price bid shall include all expenses related to the amassing of all labor, equipment, temporary offices, transportation, storage and materials required for the construction of the project. Demobilization shall include removal of equipment and temporary offices as well as cleaning of site. The sum of mobilization and demobilization shall not exceed 10% of the contract price. Partial

Payments for mobilization shall be as follows:

Construction Percent Complete Allowable Percent of Lump

Sum for Mobilization

5% 10%

10% 25%

25% 50%

100% 100%

B. Bonds and Insurance:

1. Measurement: The quantity to be paid for under this Section shall be on a lump sum basis.

2. Basis of Payment: The work specified in this Section consists of securing the appropriate bonds and insurance policies in the amounts specified by the contract documents. Payment shall be made at the Contract Lump Sum Price and shall include, but not be limited to, the costs of bonds and any required insurance necessary for the start of the work.

C. Electrical Service and Generator

1. Measurement: The quantity to be paid for under this section shall be on a lump sum basis.

2. Payment: The work shall include coordination with utility company for new service, installation of service, providing generator, transfer switch, wiring and conduit, concrete pad and startup and commissioning.

D. Radio Cabinet and Miscellaneous Site Work at Tower.

1. Measurement: The quantity to be paid for under this section shall be on a lump sum basis.

2. Payment: The work shall include providing radio cabinet, relocating existing radios, concrete pad, startup and testing. The work shall also include replacement of fencing, site grounding and other miscellaneous work associated with the tower site not covered under other items.

E. OT/IT Cabling, Duct Banks, and Telecommunications Rooms.

01 22 13 - 3

1. Measurement: The quantity to be paid for under this section shall be on a lump sum basis.

2. Payment: The work shall include construction of new duct banks, furnishing, installing, terminating and testing fiber optic cables for OT/IT networks, and work associated with the telecommunications rooms.

F. Alternative Bid: Relocation of Generator and Transfer Switch

1. Measurement: The quantity to be paid for under this section shall be on a lump sum basis.

2. Payment: The work shall include relocating the existing generator and transfer switch from the Sanitation building to also include new concrete pad, mounting and wiring along with startup and commissioning.

G. Project Allowance:

1. Measurement: Includes a stipulated amount available as reserve for sole use by CITY to cover unanticipated costs including, items unforeseen and necessary but not included in bid, unanticipated conflicts and/or design changes required during construction, and minor increases to existing bid item quantities, which are necessary for safe and timely completion of the Work. The quantity to be paid for under this

Section shall be the actual fees incurred by the Contractor.

2. Basis of Payment: Payment shall be for the complete installation of CITY directed items that are in addition to the scope of services. The City must authorize in writing the scope and fee under this pay item prior to any work being performed. Payment will be made upon submittal of verifiable costs and expenses, and upon acceptance of the work by the City.

PART 2 – PRODUCTS (NOT USED)

PART 3 – EXECUTION (NOT USED)

02222 - 1 Excavation

SECTION 02222

EXCAVATION

PART 1 GENERAL

1.01 SUMMARY

A. This section includes requirements for performing open cut excavations to the widths and depths necessary for constructing duct banks.

B. Related Work Specified in Other Sections Includes:

1. Section 02223 - Backfilling

1.02 DEFINITIONS

A. Earth:

1. "Earth" includes all materials which, in the opinion of the Engineer, do not require blasting, barring, or wedging for their removal from their original beds.

Specifically excluded are all ledge and bedrock and boulders or pieces of masonry larger than one cubic yard in volume.

1.03 SUBMITTALS

A. General:

1. Provide all submittals, including the following, as specified in Section 01 33 00.

B. Dewatering Excavation Plan:

1. Develop an excavation dewatering plan that considers site ground and groundwater conditions, the type and arrangement of the equipment to be used and the proper method of groundwater disposal. Prepare the dewatering plan before beginning excavations below groundwater. Maintain one copy of the dewatering plan at the project site to be available for inspection while all dewatering operations are underway.

1.04 SITE CONDITIONS

A. Actual Conditions:

1. Make any geotechnical investigations deemed necessary to determine actual site conditions.

B. Underground Utilities:

1. Locate and identify all existing underground utilities prior to the commencement of Work.

C. Quality and Quantity:

1. Make any other investigations and determinations necessary to determine the quality and quantities of earth and the methods to be used to excavate.

02222 - 2 Excavation

PART 2 PRODUCTS (NOT USED)

PART 3 EXECUTION

3.01 GENERAL

A. Clearing:

1. Clear open-cut excavation sites of obstructions preparatory to excavation.

Clearing includes removal and disposal of vegetation, trees, stumps, roots and bushes, except those specified to be protected during trench excavation.

B. Banks:

1. Shore or slope banks to the angle of repose to prevent slides or cave-ins.

3.02 STRUCTURE EXCAVATION

A. Excavation Size:

1. Provide excavations of sufficient size and only of sufficient size to permit the

Work to be economically and property constructed in the manner and of the size specified.

B. Excavation Shape:

1. Shape and dimension the bottom of the excavation in earth to the shape and dimensions of the underside of the structure or drainage blanket wherever the nature of the excavated material permits.

C. Over excavate soft zones and replace with compacted select fill.

3.03 TRENCH EXCAVATION

A. Preparation:

1. Properly brace and protect trees, shrubs, poles and other structures which are to be preserved. Unless shown or specified otherwise, preserve all trees and large shrubs. Hold damage to the root structure to a minimum. Small shrubs may be preserved or replaced with equivalent specimens.

B. Adequate Space:

1. Keep the width of trenches to a minimum, however provide adequate space for workers to place and join conduits and install supports along with the backfilling of the duct bank properly.

C. Depth:

1. Excavate trenches to a minimum depth of 6 inches below the bottom of encasement for electrical ducts, unless otherwise shown, specified or directed, so that bedding material can be placed in the bottom of the trench and shaped to provide a continuous, firm bearing for duct encasement, pipe barrels and bells.

D. Unstable Materials:

02222 - 3 Excavation

1. If unstable material is exposed at the level of the bottom of the trench excavation, excavate the material in accordance with the subsection headed "Authorized Additional Excavation".

2. When in the judgment of the Engineer the unstable material extends to an excessive depth, the Engineer may advise, in writing, the need for stabilization of the trench bottom with additional select fill material or a crushed stone or gravel mat or the need to provide firm support for the electrical duct by other suitable methods.

3. Payment for such trench stabilization will be made under the appropriate Contract Items or where no such items exist, as a change in the Work.

E. Length of Excavation:

1. Keep the open excavated trench preceding the electrical duct laying operation and the unfilled trench, with duct in place, to a minimum length which causes the least disturbance. Provide ladders for a means of exit from the trench as required by applicable safety and health regulations.

F. Water:

1. Allow no water to rise in the trench excavation until sufficient backfill has been placed to prevent duct flotation.

3.04 SHORT TUNNEL EXCAVATION

A. Short Tunnel Requirements:

1. In some instances, trees, shrubs, utilities, sidewalks and other obstructions may be encountered, the proximity of which may be a hindrance to opencut trench excavation. In such cases, excavate by means of short tunnels in order to protect such obstructions against damage.

2. Construct the short tunnel by hand, auger or other approved method approximately 6 inches larger than the diameter of outer electrical duct encasement.

3. Consider such short tunnel work incidental to the construction of conduits and all appurtenances. The need for short tunnels will not be grounds for additional payment.

3.05 FINISHED EXCAVATION

A. Finish:

1. Provide a reasonably smooth finished surface for all excavations, which is uniformly compacted and free from irregular surface changes.

B. Finish Methods:

1. Provide a degree of finish which is ordinarily obtainable from bladegrade operations, except as otherwise specified in Section 02223.

3.06 PROTECTION

A. Traffic and Erosion:

02222 - 4 Excavation

1. Protect newly graded areas from traffic and from erosion.

B. Repair:

1. Repair any settlement or washing away that may occur from any cause, prior to acceptance. Re-establish grades to the required elevations and slopes.

C. Other Requirements:

1. Conduct all Work in accordance with the environmental protection requirements specified in local and state regulations.

3.07 AUTHORIZED ADDITIONAL EXCAVATION

A. Additional Excavation:

1. Carry the excavation to such additional depth and width as authorized in writing, for the following reasons:

a. In case the materials encountered at the elevations shown are not suitable.

b. In case it is found desirable or necessary to go to an additional depth, or to an additional depth and width.

B. Refill Materials:

1. Refill such excavated space with either authorized Class D concrete or compacted select fill material.

C. Compaction:

1. Where necessary, compact fill materials to avoid future settlement.

D. Payment:

1. Additional earth excavations so authorized and concrete or select fill materials authorized for filling such additional excavation and compaction of select fill materials will be paid for under the appropriate Contract Items or where no such items exist, as a change in the Work.

3.08 UNAUTHORIZED EXCAVATION

A. Stability:

1. Refill any excavation carried beyond or below the lines and grades shown, except as specified in the subsection headed "Authorized Additional Excavation", with such material and in such manner as may be approved in order to provide for the stability of the various structures.

B. Refill Materials:

1. Refill spaces beneath all manholes, or conduits excavated without authority with

Class D concrete or compacted select fill material, as approved.

C. Payment:

1. Refill for unauthorized excavation will not be measured and no payment will be made therefor.

02222 - 5 Excavation

3.09 SEGREGATION, STORAGE AND DISPOSAL OF MATERIAL

A. Stockpiling Suitable Materials:

1. Stockpile topsoil suitable for final grading and landscaping and excavated material suitable for backfilling or embankments separately on the site in approved locations.

B. Stockpile Locations:

1. Store excavated and other material a sufficient distance away from the edge of any excavation to prevent its failing or sliding back into the excavation and to prevent collapse of the wall of the excavation. Provide not less than 2 feet clear space between the top of any stockpile and other material and the edge of any excavation.

C. Excess Materials:

1. Transport and dispose of surplus excavated material and excavated material unsuitable for backfilling or embankments at an off-site disposal location. Obtain the off-site disposal location.

3.10 REMOVAL OF WATER

A. Water Removal:

1. At all times during the excavation period and until completion and acceptance of the Work at final inspection, provide ample means and equipment with which to remove promptly and dispose of properly all water entering any excavation or other parts of the Work.

B. Dry Excavations:

1. Keep the excavation dry.

C. Water Contact:

1. Allow no water to rise over or come in contact with concrete until the concrete has attained a set and, in any event, not sooner than 12 hours after placing the masonry or concrete.

D. Discharge of Water:

1. Dispose of water pumped or drained from the Work in a safe and suitable manner without damage to adjacent property or streets or to other work under construction.

E. Protection:

1. Provide adequate protection for water discharged onto streets. Protect the street surface at the point of discharge.

F. Sanitary Sewers:

1. Discharge no water into sanitary sewers.

G. Storm Sewers:

02222 - 6 Excavation

1. Discharge no water containing settleable solids into storm sewers.

H. Repair:

1. Promptly repair any and all damage caused by dewatering the Work.

02223 - 1 Backfilling

SECTION 02223

BACKFILLING

PART 1 GENERAL

1.01 SUMMARY

A. This section includes requirements for backfilling areas that have been excavated.

B. Backfill all excavation to the original surface of the ground or to such other grades as may be shown or required. For areas to be covered by topsoil, leave or stop backfill 12-inches below the finished grade or as shown. Obtain approval for the time elapsing before backfilling against masonry structures. Remove from all backfill, any compressible, putrescible, or destructible rubbish and refuse and all lumber and braces from the excavated space before backfilling is started. Leave sheeting and bracing in place or remove as the work progresses.

C. Equipment Limitations: Do not permit construction equipment used to backfill to travel against or over cast-in-place concrete structures until the specified concrete strength has been obtained, as verified by concrete test cylinders. In special cases where conditions warrant, the above restriction may be modified providing the concrete has gained sufficient strength, as determined from test cylinders, to satisfy design requirements for the removal of forms and the application of load.

1.02 REFERENCES

A. Codes and standards referred to in this Section are:

1. ASTM D 1557 - Standard Test Methods for Moisture-Density Relations of Soil and Soil-Aggregate Mixtures Using 10 lb Rammer and 18 in Drop

PART 2 PRODUCTS

2.01 BACKFILL MATERIAL - GENERAL

A. General:

1. Backfill with sound materials, free from waste, organic matter, rubbish, boggy or other unsuitable materials.

B. General Materials Requirements:

1. Conform materials used for backfilling to the requirements specified. Follow common fill requirements whenever drainage or select fill is not specified.

Determine and obtain the approval of the appropriate test method where more than one compaction test method is specified.

02223 - 2 Backfilling

2.02 SELECT FILL

A. Materials for Select Fill:

1. Use gravel, crushed stone, limestone screenings or other granular or similar material as approved which can be readily and thoroughly compacted to 95 percent of the maximum dry density obtainable by ASTM D 1557.

2. Grade select fill between the following limits:

U.S. Standard Sieve

Percent Passing by Weight

2 inch 100 1-1/2 inch 90-100

1 inch 75-95 1/2 inch 45-70

#4 25-50 #10 15-40 #200 5-15

3. Very fine sand, uniformly graded sands and gravels, or other materials that have a tendency to flow under pressure when wet are unacceptable as select fill.

2.03 COMMON FILL

A. Materials for Common Fill:

1. Material from on-site excavation may be used as common fill provided that it can be readily compacted to 90 percent of the maximum dry density obtainable by ASTM D 1557 and does not contain unsuitable material. Select fill may be used as common fill at no change in the Contract Price.

B. Granular Materials On-Site:

1. Granular on-site material, which is fairly well graded between the following limits may be used as granular common fill:

U.S. Standard Sieve

Percent Passing by Weight

3 inch 100 #10 50-100 #60 20-90 #200 0-20

C. Cohesive Materials On-Site:

1. Cohesive site material may be used as common fill.

2. The gradation requirements do not apply to cohesive common fill.

3. Use material having a liquid limit less than or equal to 40 and a plasticity index less than or equal to 20.

02223 - 3 Backfilling

D. Material Approval:

1. All material used as common fill is subject to approval. If there is insufficient on-site material, import whatever additional off-site material is required which conforms to the specifications and at no additional cost.

PART 3 EXECUTION

3.01 ELECTRICAL DUCT AND PRECAST MANHOLE BEDDING

A. Bedding Compaction:

1. Bed all electrical ducts and precast manholes in well graded, compacted, select fill conforming to the requirements except as otherwise shown, specified, or required.

Extend electrical duct bedding a minimum of 6 inches below the bottom of the duct encasement for the full trench width. Compact bedding thickness no less than 6 inches for precast concrete manhole bases.

B. Concrete Work Mats:

1. Cast cast-in-place manhole bases and other foundations for structures against a

Class D concrete work mat in clean and dry excavations, unless otherwise shown, specified as required.

C. Bedding Placemat:

1. Place select fill used for bedding beneath electrical ducts and precast manhole bases, in uniform layers not greater than 9 inches in loose thickness. Thoroughly compact in place with suitable mechanical or pneumatic tools to not less than 95 percent of the maximum dry density as determined by ASTM D 1557.

D. Use of Select Fill:

1. Bed of existing underground structures, tunnels, conduits and pipes crossing the excavation with compacted select fill material. Place bedding material under and around each existing underground structure, tunnel, conduit or pipe and extend underneath and on each side of a distance equal to the depth of the trench below the structure, tunnel, conduit or pipe.

3.02 PIPE BEDDING AND INITIAL BACKFILL

A. Hand Placement:

1. Place select fill by hand for initial pipe backfill from top of bedding to 1 foot over tops of pipes in uniform layers not greater than 6 inches in loose thickness. Tamp under pipe haunches and thoroughly compact in place the select fill with suitable mechanical or pneumatic tools to not less than 95 percent of the maximum dry density as determined by ASTM D 1557.

B. Stone Placement:

1. Do not place large stone fragments in the pipe bedding or backfill to 1 foot over the top of pipes, nor nearer than 2 feet at any point from any pipe, conduit or concrete wall.

02223 - 4 Backfilling

C. Unallowed Materials:

1. Pipe bedding containing very fine sand, uniformly graded sands and gravels, or other materials that have a tendency to flow under pressure when wet is unacceptable.

3.03 BEDDING PLACEMENT AND BACKFILL FOR SHORT TUNNEL

A. Bed electrical ducts placed in short tunnels in select fill or Class D concrete.

Completely fill the remainder of the annular space between the outside of the pipe wall and the tunnel wall with select fill, suitable job-excavated material, or Class D concrete, as approved. Suitably support pipelines or ducts in short tunnels to permit placing of backfill suitably tamped in place.

3.04 TRENCH BACKFILL

A. General:

1. Backfill trenches from 1 foot over the top of the top of electrical duct bedding or as shown to the bottom of pavement base course, subgrade for lawns or lawn replacement, to the top of the existing ground surface or to such other grades as may be shown or required.

B. Materials:

1. Provide select fill, suitable job-excavated material or other material, as specified and as approved for trench backfill.

C. Depth of Placement - General:

1. Except under pavements, walkways, railroad tracks, and street or highway appurtenances, or as otherwise specified, place trench backfill in uniform layers not greater than 9 inches in loose thickness and thoroughly compact in place using suitable mechanical or pneumatic equipment. Compact backfill to not less than 90 percent of the maximum dry density as determined by ASTM D 1557.

D. Depth of Placement - Traffic Areas and Under Utilities:

1. Where pavements, walkways, railroad tracks and street or highway appurtenances are to be placed over trenches and under utilities or utility services crossing the trench, provide trench backfill using select fill placed in uniform layers not greater than 9 inches in loose thickness and thoroughly compacted in place with equipment as specified above. Compact backfill to not less than 95 percent of the maximum dry density as determined by ASTM D 1557.

E. Depth of Placement - Undeveloped Areas:

1. In undeveloped areas and where select fill material or hand-placed backfill are not specified or required, place suitable job-excavated material or other approved backfill in lifts not exceeding 12 inches in loose thickness. When the trench is full, consolidate the backfill by jetting, spading, tamping or puddling to ensure complete filling of the excavation. Mound the top of the trench approximately 12 inches to allow for consolidation of backfill.

02223 - 5 Backfilling

F. Dropping of Material on Work:

1. Do trench backfilling work in such a way as to prevent dropping material directly on top of any conduit through any great vertical distance. Do not allow backfilling material from a bucket to fall directly on a structure and, in all cases, lower the bucket so that the shock of failing earth will not cause damage.

G. Distribution of Large Materials:

1. Break lumps up and distribute any stones, pieces of crushed rock or lumps which cannot be readily broken up, throughout the mass so that all interstices are solidly filled with fine material.

3.05 STRUCTURE BACKFILL

A. Use of Select Fill:

1. Use select fill underneath all structures, and adjacent to structures where pipes, connections, electrical ducts and structural foundations are to be located within this fill. Use select fill beneath all pavements, walkways, and railroad tracks, and extend to the bottom of pavement base course or ballast.

2. Place backfill in uniform layers not greater than 8 inches in loose thickness and thoroughly compact in place with suitable approved mechanical or pneumatic equipment.

3. Compact backfill to not less than 95 percent of the maximum dry density as determined by ASTM D 1557.

B. Use of Common Fill:

1. Use common granular fill adjacent to structures in all areas not specified above, unless otherwise shown or specified. Select fill may be used in place of common granular fill at no additional cost.

2. Extend such backfill from the bottom of the excavation or top of bedding to the bottom of subgrade for lawns or lawn replacement, the top of previously existing ground surface or to such other grades as may be shown or required.

3. Place backfill in uniform layers not greater than 8 inches in loose thickness and thoroughly compact in place with suitable equipment, as specified above.

4. Compact backfill to not less than 90 percent of the maximum dry density as determined by ASTM D 1557.

3.06 COMPACTION EQUIPMENT

A. Equipment and Methods:

1. Carry out all compaction with suitable approved equipment and methods.

2. Compact clay and other cohesive material with sheep's-foot rollers or similar equipment where practicable. Use hand held pneumatic tampers elsewhere for compaction of cohesive fill material.

3. Compact low cohesive soils with pneumatic-tire rollers or large vibratory equipment where practicable. Use small vibratory equipment elsewhere for compaction of cohesionless fill material.

02223 - 6 Backfilling

4. Do not use heavy compaction equipment over pipelines or other structures, unless the depth of fill is sufficient to adequately distribute the load.

3.07 FINISH GRADING

A. Final Contours:

1. Perform finish grading in accordance with the completed contour elevations and grades shown and blend into conformation with remaining natural ground surfaces.

2. Leave all finished grading surfaces smooth and firm to drain.

3. Bring finish grades to elevations within plus or minus 0.10 foot of elevations or contours shown.

B. Surface Drainage:

1. Perform grading outside of building or structure lines in a manner to prevent accumulation of water within the area. Where necessary or where shown, extend finish grading to ensure that water will be carried to drainage ditches, and the site area left smooth and free from depressions holding water.

3.08 RESPONSIBILITY FOR AFTERSETTLEMENT

A. Aftersettlement Responsibility:

1. Take responsibility for correcting any depression which may develop in backfilled areas from settlement within one year after the work is fully completed. Provide as needed, backfill material, pavement base replacement, permanent pavement, sidewalk, curb and driveway repair or replacement, and lawn replacement, and perform the necessary reconditioning and restoration work to bring such depressed areas to proper grade as approved.

3.09 INSPECTION AND TESTING OF BACKFILLING

A. Sampling and Testing:

1. Provide sampling, testing, and laboratory methods in accordance with the appropriate ASTM Standard Specification. Subject all backfill to these tests.

B. Correction of Work:

1. Correct any areas of unsatisfactory compaction by removal and replacement, or by scarifying, aerating or sprinkling as needed and recompacting in place prior to placement of a new lift.

02582-1 Underground Ducts and Manholes

SECTION 02582

UNDERGROUND DUCTS AND MANHOLES

PART 1 GENERAL

1.01 SUMMARY

A. Section Includes: Requirements for underground electrical work, materials and products and raceway systems.

1.02 REFERENCE STANDARDS

A. The following publications of the issues listed below, but referred to thereafter by basic designation only, form a part of this specification to the extent indicated by the references thereto:

B. American Society for Testing and Materials (ASTM):

1. ASTM A 36, Specification for Structural Steel.

C. Federal Specifications (Fed. Spec.):

1. Fed. Spec. FF-S-107C (2), Screws, Tapping and Drive.

2. Fed. Spec. FF-S-325, Shield, Expansion; Nail, Expansion; and Nail, Drive Screw

(Devices, Anchoring, Masonry) Group II (Shield, Expansion Bolt Anchor) Type 4 (Wedge expansion anchors) Class 1 (one-piece steel expander with cone taper integral with stud).

3. Fed. Spec. RR-F-621C, Frames, Covers, Gratings, Steps, Sump, and Catch Basin Manhole.

1.03 SUBMITTALS

A. Submit the following information for approval:

1. Catalog Information:

a. Conduit. (All Types)

b. Corrosion-Resistant Handholes.

c. Precast Handholes.

d. Manhole Frame and Cover.

e. Handhole Frame and Cover.

1.04 CERTIFICATES

A. Material and Equipment: Provide manufacturer's statement certifying that the product supplied meets or exceeds contract requirements.

1. Precast handhole and accessories.

2. Manhole frame and cover.

02582-2 Underground Ducts and Manholes

PART 2 PRODUCTS

2.01 MATERIALS AND EQUIPMENT

A. Basic Electrical Materials: Those products such as building wire, connectors, fittings and similar devices as required for work of this Section are as specified in Division 16.

B. Provide materials and equipment listed by UL, when such equipment is listed or approved.

2.02 WATERPROOFING OF CONDUIT JOINTS

A. General: Ensure that equipment and materials for waterproofing conduit joints complies with the following manufacturers for quality, installation procedures and guaranteed end results.

1. Rigid Metal Conduit:

a. Thread sealant: As recommended and approved by the conduit manufacturer.

b. Cleaning solvent: As recommended and approved by the conduit manufacturer.

2. Non-Metallic Conduit:

a. All weather, quick-set joint cement: Approved by the conduit manufacturer.

b. Cleaning solvent: As recommended and approved by the conduit manufacturer.

2.03 HANDHOLES

A. Provide weatherproof and watertight junction boxes for flush in-ground installation where indicated on the Contract Drawings.

1. Construction: Fiberglass, Composite or Polymer Concrete

2. Provide box of minimum size of 8-inches x 8-inches; larger as required by the

National Electrical Code, or as indicated on the Contract Drawings and/or required by the field conditions.

3. Handholes shall meet ASSHTO H-20.

4. Acceptable Manufacturers:

a. Hubbell Power Systems (Quazite)

b. Approved equal

2.04 PRECAST CONCRETE MANHOLES

A. Provide precast concrete, watertight manholes as indicated on the Contract Drawings.

Provide manholes complete with necessary, required and specified appurtenances such as watertight locking type covers, cable racks, pulling-in irons, ground rods and ladder and water drainage provisions.

B. Manholes shall meet AASHTO H-20.

C. Acceptable manholes/handholes manufactures:

1. Connecticut Precast Corp.

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2. United Concrete Products Inc.

3. Approved equal

2.05 SUPPORTS AND FASTENERS

A. Supporting Devices: Pre-engineered UL Listed supporting systems of electrogalvanized steel or electrogalvanized steel PVC coated products.

B. Fasteners: Provide anchoring devices to anchor conduit or raceway, and supporting devices or pre-engineered supporting systems, to the structure, of the type designed for the specific purpose of anchoring into structure materials at intended point of installation. Fasteners shall be stainless steel. RAWL PLUGS NOT PERMITTED.

2.06 UNDERGROUND WARNING TAPE

A. Service Conduit Identification

1. Printed polyethylene material, 4 mils minimum thickness and 6” width.

Overcoated graphics to read, "CAUTION-BURIED ELECTRIC LINE BELOW".

APWA color to be red.

2. Acceptable Manufacturers:

a. Brady Identoline Series

b. Seton

c. Approved equal

B. Communication and Control Wiring Conduit Identification

1. Printed polyethylene material, 5 mils minimum thickness with minimum one-inch high lettering and 6” width. Overcoated graphics to read, "CAUTION-BURIED ELECTRIC LINE BELOW" for electric lines and/or “CAUTION - BURIED COMMUNICATIONS BELOW” for communication lines. APWA color to be red.

2. Acceptable Manufacturers:

a. Seton

b. Pro-line

c. Approved equal

PART 3 EXECUTION

3.01 INSTALLATION

A. General Requirements: (For Underground Work)

1. Install underground conduit systems in accordance with Article 300 of the NEC, in accordance with previous requirements of this Section, and the following requirements exceeding NEC:

a. Install Concrete Encasement as indicated

b. Where detailed on the Contract Drawings, underground conduits, both single and banked, concrete encase and reinforce using 5/8-inch steel reinforcing rods as indicated on the Contract Drawings.

02582-4 Underground Ducts and Manholes

c. Bank conduits to the extent indicated and secure in place with separators at 6-foot intervals. Provide separators with sufficient strength to prevent displacement of conduits when placing backfill or pouring concrete encasement.

d. Lay conduit lines to grade a minimum of three inches per 100 feet. Grade conduit lines away from buildings, except conduit lines running between buildings, without intervening handholes or manholes shall be level.

e. Where conduit lines run to manholes, handholes or similar underground structures, grade conduits to drain to such.

f. Construct underground conduit lines to be watertight. Stagger conduit couplings in banks of conduits.

g. Unless otherwise indicated on drawing or details, where conduits change direction or turn up at equipment, transformers, buildings, terminal poles, etc., use long sweep PVC coated steel RMC conduit elbows.

h. Provide two- and one-half feet minimum cover over conduits and over concrete encasement of conduit, unless indicated otherwise or specified.

i. Where conduits are to be turned up into equipment pads, extend the concrete encasement for the conduits up to the top of the concrete pad and provide a 3/4" chamfer around exposed top edges. Isolate the concrete encasement for the conduits from the concrete pad for the equipment or transformer pad.

Provide 2" high crushable fiber materials around duct bank encasement.

j. Extend conduits 6 inches above concrete slab surface. Install insulating grounding bushing on all conduits. Perform concrete work as specified in Division 3 "Cast-In-Place Concrete".

k. Where conduits are to be turned up at terminal poles, extend the concrete encasement for the conduits up pole to a height of 24 inches above finished grade and be provided with a 3/4" chamfer around all exposed top edges.

Perform concrete work as specified in Division 3 "Cast-In-Place-Concrete".

B. Underground Duct Bank with Concrete Encasement: Construct underground duct bank lines of individual conduits encased in concrete as indicated. Except where rigid galvanized steel conduit is indicated or specified, use only one kind of conduit in any one duct bank. Use ducts no smaller than 4 inches in diameter unless otherwise indicated. Provide concrete encasement rectangular in cross-section surrounding the bank and provide at least 3 inches of concrete cover for ducts. Separate conduit by a minimum concrete thickness of 2-inches, and maintain a separation, between conduit centerlines, of seven and one-half inches. Separate power conduits from telephone, communication and/or data highway conduits a minimum of 24 inches of earth or concrete thickness of 8 inches, unless otherwise indicated.

C. Place duct bank lines with a continuous slope downward toward manholes, handholes and away from buildings with a pitch of not less than 3 inches in 100 feet. Except at conduit risers, change direction of bends in runs exceeding a total of 10 degrees, either vertical or horizontal, by long sweep bends having a minimum radius of curvature of 25 feet. Sweep bends may be made up of one or more curved or straight sections or combinations thereof. Use only manufactured bends with a minimum radius of 18 inches for use with conduits of less than 3 inches in diameter and a minimum radius of

02582-5 Underground Ducts and Manholes

36 inches for conduits of 3 inches in diameter and larger. Terminate conduits in end-bells where duct bank lines enter manholes and handholes as indicated on the Contract Drawings.

D. Provide separators compatible with the conduit utilized and conforming to those specified in other Sections of these Specifications. Stagger the joints of the conduits by rows and layers to provide a duct bank line having the maximum strength. During construction, protect partially completed duct bank lines from the entrance of debris such as mud, sand, and dirt by means of suitable conduit plugs. As each section of a duct bank line is completed from manhole to manhole, from manhole to building or structure and/or from handhole to handhole, draw a testing mandrel not less than 12 inches long with a diameter 1/4 inch less than the size of the conduit, through each conduit, after which draw a brush having the diameter of the duct bank and stiff bristles through until the conduit is clear of particles of earth, sand, and/or gravel;

immediately install conduit plugs. Provide a plastic pull rope, having a minimum of 3 additional feet at each end, in telephone and spare duct banks.

E. Separator Installation: Space separators close enough to prevent sagging and deforming of ducts and secure separators to earth and to ducts to prevent floating during concreting. Stagger spacers approximately 6 inches (150 mm) between tiers.

Tie entire assembly together using fabric straps; do not use tie wires or reinforcing steel that may form conductive or magnetic loops around ducts or duct groups.

F. Conform concrete to that specified in Division 3 of this Specification.

G. Duct Entrances to Manholes and Handholes: Space end bells approximately 10 inches o.c. for 5-inch ducts and vary proportionately for other duct sizes. Change from regular spacing to end-bell spacing 10 feet from the end bell without reducing duct line slope and without forming a trap in the line. Grout end bells into manhole walls from both sides to provide watertight entrances.

H. Backfilling: Provide a continuous plastic warning tape about 12 inches below the top of the trench directly over each underground duct bank. Conform concrete to that specified in Division 3 of this Contract. Progress backfilling as rapidly as the construction, testing and acceptance of the work permits. Ensure backfill is free from roots, wood, scrap material, and other vegetable matter and refuse. Install and compact backfill as specified in Section 0223.

3.02 CONDUIT WATERPROOFING

A. Non-Metallic Conduit:

1. Plastic PVC Conduit (Schedule 80): Liberally coat the end of the conduit with an approved PVC cleaner and PVC cement before joining. Insert joint into the coupling, pushing firmly and rotating conduit until it reaches the pre-formed stopping ridge within the coupling.

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3.03 MANHOLES/HANDHOLES

A. Provide steel bar pulling-in irons bent in the configuration of a deformed "Z" and cast in the walls and floors. Pocket pulling-in irons in the floor and center directly under the manhole cover. Locate pulling-in irons in the wall not less than 6 inches above or below, and opposite the conduits entering the manhole. Locate the pulling-in-irons such as not to interfere with the cable distribution racks. Project pulling-in-irons into the manhole approximately 4 inches. Zinc-coat irons after fabrication.

B. Ensure cable racks, including hooks and insulators, are sufficient to accommodate the cables and spaced not more than 24 inches horizontally. Provide wall bracket of glass reinforced nylon channel. Provide support brackets of glass reinforced nylon and of the removable type. Provide insulators of dry-process glazed porcelain.

C. Hot-dipped galvanize all metal-work within the manhole, including the steel ships ladder after fabrication and ground.

3.04 MANHOLE/HANDHOLE INSTALLATIONS

A. Where openings into manholes are below final finished grade, extend openings to the required elevation with either concrete or brick suitably arranged to support or anchor the frames and covers. Obtain engineer approval of the construction method and procedure before any work is done.

B. Where required for pulling cables, furnish and install in the walls of the manholes and handholes, a sufficient number of inserts for the proper attachment of cable supports.

C. In general, properly dress and rack cable/or wire on the support arms and insulators around the walls of the manholes and handholes, providing slack where required for future rearrangements. Install cable support brackets, along with the support arms and porcelain insulators, on each wall of the manhole and handhole. Secure cables within manholes and handholes to the insulators by marlin rope. Use proper regard for neat and orderly appearance and location and provide accessibility for future connections.

Take care not to damage the walls of the manholes and handholes during cable pulling.

D. Provide each manhole with a 1-inch diameter hole in the floor for a ground rod.

Provide a 3/4-inch diameter by 10-foot-long copper clad ground rod installed in one corner with 6 inches of the ground rod left extended above finished floor. Seal through floor. Ground metal work to the ground rod.

E. Conform manhole frames and covers to requirements as outlined above in these Specifications; and ensure Engineer approval.

F. Provide a manhole drainage system as indicated on the Contract Drawings.

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3.05 FRAME AND COVER INSTALLATION

A. Where required, make final adjustment of frame to elevation using materials grade rings.

1. Set precast grade rings in Waterproof Mortar. Do not exceed 3/4-inch maximum and 3/8-inch minimum mortar thickness. Wet, but do not saturate precast grade rings immediately before laying.

2. Precast grade ring: Pre-set to proper plane and elevation using wedges or blocks of cementation material not exceeding one spare inch wide on each side. Permit no more than four wedges or blocks per grade ring. Incorporate wedges or blocks in fresh mortar in a manner to completely encase each. Crown fresh mortar to produce squeeze-out between grade rings. Tool exposed joints with appropriately shaped tool and compact mortar edge into joints. Clean off excess mortar prior to initial mortar set.

3. Bolt manhole frames in place on manhole top section, or on leveling units if required, after installing 2-inch-thick preformed plastic sealing compound on bearing surface of manhole frame. Remove excess sealing compound squeeze-out after manhole frame is bolted in place.

4. Use bolts of sufficient length to properly pass through leveling units, if used, engage full depth of manhole top section inserts and allow enough threaded end to pass through manhole frame to properly tighten nut and washer. Tighten manhole frame bolts after mortar has cured.

3.06 FIELD COATING

A. Clean cast-iron or steel frames, covers and gratings not buried in masonry of mortar, rust, grease, dirt and other deleterious materials by an approved blasting process, and give a coat of bituminous coating material. Clean surfaces that cannot be cleaned satisfactorily by blasting to bare metal, by wire brushing, or other mechanical means.

Wash surfaces contaminated with rust, dirt, oil, grease or other contaminants with solvents until thoroughly cleaned. Immediately after cleaning, coat surface with a pretreatment coating or give a crystalline phosphate coating. As soon as practicable after the pretreatment coating has dried, prime treated surfaces with a coat of zinc chromate primer and coat with synthetic exterior gloss enamel.

3.07 CONNECTIONS TO HANDHOLES

A. Construct concrete encased duct bank lines connecting to manholes or handholes to have a tapered section adjacent to the manhole or handhole to provide shear strength.

Construct manholes and handholes to provide for keying the concrete envelope of the duct bank line into the wall of the manhole or handhole. Use vibrators when this portion of the envelope is poured to assure a seal between the envelope and the wall of the manhole or handhole.

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3.08 CABLE DUCT BANK SHIELDS

A. Provide shields of a suitable type manufactured for the purpose where cables enter and leave manholes and handholes and other duct bank entrances.

3.09 EARTHWORK

A. Excavate to depths as required for manholes and handholes. Excavation for manholes and conform handholes to the requirements stipulated in Division 2 - Earthwork.

B. Remove waste excavated materials not required or suitable for backfill on the project from the site as directed. Provide sheeting and shoring as necessary for projection of work and safety of personnel. Remove water from excavation by pumping or other approved method.

3.10 GROUNDING

A. Provide non-current carrying metallic parts associated with electrical equipment with a maximum resistance to solid "earth" ground not exceeding the values indicated in Section 16450 of these Specifications.

3.11 DISSIMILAR SURFACES ISOLATION

A. Paint aluminum surfaces at point of contact with wood, concrete or masonry construction with one coat (minimum dry mil thickness - 5.0 mils) of bituminous paint.

B. Clean away excess or misplaced paint materials from aluminum surfaces and adjoining construction materials.

03300-1 Cast-in-Place Concrete

SECTION 03300

CAST-IN-PLACE CONCRETE

PART 1 GENERAL

1.01 SCOPE OF WORK

A. Designing, planning and completion of the Work, in accordance with the requirements and intent of these Contract Documents,…