2025-09-04_AD NDST Signal Rebuilds Specifications_Stamped.pdf

NDST TRAFFIC SIGNAL REBUILD DESIGN PROJECT

Construction Project Code No: 20240153

CITY OF CENTENNIAL

SPECIAL PROVISIONS

August 28, 2025

The Colorado Department of Transportation’s 2025 Standard Specifications for Road and Bridge Construction controls construction of this project. These Special Provisions are a supplement to the 2025 Standard Specifications for Road and Bridge Construction. The following special provisions reference, supplement, or modify the 2024 City of

Centennial Roadway Design and Construction Standards (the manual) & the 2016 Public Works Right-of-Way

Regulations and take precedence over the Standard Specifications and plans. Items not specifically mentioned herein will adhere to the requirements stated in the appropriate sections of the 2024 City of Centennial Roadway Design and

Construction Standards. Where those specifications and standards conflict with any portion of 2025 Standard

Specifications for Road and Bridge Construction, the City of Centennial Design and Construction Standards will take precedence.

PROJECT SPECIAL PROVISIONS

Item Date Pages

Index Pages August 28, 2025 1-2

Revision to Section 503 – Caisson (Special) August 28, 2025 3

Revision to Section 613 – Electrical Conduit August 28, 2025 4-6

Revision to Section 613 – Pull Box July 11, 2025 7-8

Revision to Section 614 – Traffic Signal Controller Cabinet July 11, 2025 9

Revision to Section 614 – Traffic Signal Controller July 11, 2025 10

Revision to Section 614 – Traffic Signal Poles July 11, 2025 11

Revision to Section 614 – Telemetry (Field) July 11, 2025 12-14

Revision to Section 614 – Uninterrupted Power Supply System August 28, 2025 15-18

Force Account Items July 11, 2025 19

Utilities July 11, 2025 20-23

9/4/2025

SSP Index 06-30-2025 [For 2025 Spec Book]

COLORADO

DEPARTMENT OF TRANSPORTATION

SPECIAL PROVISIONS

NDST TRAFFIC SIGNAL REBUILD DESIGN PROJECT

STANDARD SPECIAL PROVISIONS

No.

Name Date of Pages

Revision of Sections 101 and 106 – Revision of Sections 101 and 106 - (July 1, 2025) 4

Buy America and Build America, Buy America Requirements -

No Federal-Aid or Projects with less than $500,000 in Federal-Aid Highway Funding

Revision of Section 103 – Colorado Resident Bid Preference (July 1, 2025) 1

Revision of Section 105 – Project First (June 11, 2025) 4

Revision of Section 105 – Dispute Resolution, Dispute Review Board and (June 11, 2025) 24

Claims for Unresolved Disputes

Revision of Section 107 – Water Quality Control (Under One Acre of Disturbance) (July 1, 2025) 8

Revision of Section 108 – Liquidated Damages (July 1, 2025) 1

Revision of Section 212 – Soil Amendments, Seeding, and Sodding (July 1, 2025) 25

Revision of Section 401 – Plant Mix Pavements – General (Subsection 401.17) (July 1, 2025) 4

Revision of Section 614 - Galvanized Steel Poles (July 1, 2025) 1

Revision of Section 614 – Rectangular Rapid Flashing Beacon (June 11, 2025) 4

Revision of Section 627 – Pavement Marking Paint (July 1, 2025) 15

Affirmative Action Requirements Equal Employment Opportunity (July 1, 2025) 13

Minimum Wages, Colorado, (March 6, 2025) 10

U.S. Department of Labor General Decision Number CO20250006, Mod 1, Highway Construction for

Adams, Arapahoe, Broomfield, Clear Creek, Elbert, Gilpin, Jefferson, and Park counties.

On the Job Training (July 1, 2025) 6

REVISION TO SECTION 503

CAISSON (SPECIAL)

Section 503 of the Standard Specifications is hereby revised for this project to include the following:

DESCRIPTION

This work consists of hydro-excavation for all caisson shafts and placement of reinforcing steel. Concrete caisson, and anchor bolts, therein to form foundations for traffic signal poles in conformance with the plans and as directed by the Engineer.

MATERIALS

All pole-caisson foundations shall conform to the applicable requirements of construction specifications of the

City, except as herein provided.

The traffic signal pole foundation shall conform to the requirements of the City of Centennial.

CONSTRUCTION REQUIREMENTS

All hydro-excavation recommended water pressure (PSI) will range from 2,000 to 3,000psi for effective soil breaking and debris removal. Industry standard is below 2,800psi.

Monitor excavation depth continuously during excavation. Depth shall be verified at multiple points after excavation and before caisson placement. Maintain excavation depth within + 2inches. In loose or saturated soils, temporary casings or slurry stabilization shall be used to prevent wall collapse and maintain diameter integrity.

After excavation, visually inspect the shaft and measure diameter at various intervals to ensure uniformity.

Foundation work shall include raking and/or plumbing of the poles after loading. The Contractor shall install a stainless-steel wire cloth between the base plate and caisson so as to prevent the intrusion of pests into the pole.

Do not grout between base plate and caisson.

The Contractor shall collect a soil sample at each proposed caisson location to mid-depth of the caisson and furnish analysis of the mechanical properties of the soil sample by a qualified geotechnical engineer to the

Engineer.

BASIS OF PAYMENT

Furnishing of base plate(s), anchor bolts, and nuts that are required components of the traffic signal pole foundation will not be paid for separately but shall be included in the unit price for Caisson (Special). Materials necessary for stabilization, if necessary, will not be paid for separately but shall be included in the unit price for

Caisson (Special). Soil sampling and testing will not be paid for separately but shall be included in the unit price for Caisson (Special).

Pay Item Pay Unit

Caisson (Special 24 Inch)

Caisson (Special 36 Inch)

Caisson (Special 42 Inch)

Caisson (Special 48 Inch)

Linear Foot

Linear Foot

Linear Foot

REVISION TO SECTION 613

ELECTRICAL CONDUIT

Section 613 of the Standard Specifications is hereby revised for this project to include the following:

DESCRIPTION

Subsection 613.01 shall include the following:

This work includes furnishing and installing new High-Density Polyethylene (HDPE) and Polyvinyl Chloride

(PVC) electrical conduit and fittings for use with fiber optic cable, electrical conductors, traffic signal cabling, and communications cabling at locations shown on the plans.

MATERIALS

Subsection 613.02(c) shall include the following:

All materials furnished, assembled, fabricated, or installed under this item shall be new, Underwriters

Laboratories (UL) listed, corrosion resistant and National Electric Code (NEC) compliant. Materials shall be submitted to the Project Engineer for approval.

Electrical conduits crossing under roadways and those being installed by boring shall be HDPE Schedule 80 or greater. Elsewhere, electrical conduits shall be Schedule 40 PVC or greater. No metal conduit shall be used.

PVC conduit and fittings shall be certified by the manufacturer as meeting ANSI/UL 651. HDPE conduit and fittings shall be certified by the manufacturer as meeting ANSI/UL 651A. The manufacturers shall be ISO 9001 compliant.

All conduit runs that exceed 10’ in length shall have a pull tape. The pull tape shall be a continuous nylon line pulled into the conduit, along with the specified electrical cables. The line shall be firmly secured at each end of the conduit run with a minimum slack of 3’. The pull tape shall have a minimum tensile strength of 1250 lbs. and be of a design and manufacture that prevents cutting or burning into the conduit during cable installation.

All conduit runs that will not have a copper conductor installed shall have a #14 AWG stranded copper conductor placed inside for locating purposes.

All conduit bends, including factory-installed bends, shall not have a bend radius less than six times the inside diameter of the conduit. Where factory bends are not used, conduit shall be bent without crimping or flattening, using the longest radius practicable.

CONSTRUCTION REQUIREMENTS

Subsection 613.07 shall include the following:

All cables and conductors shall be installed in conduit or within poles, pedestals, or mast arms, except in cases where the plans specify aerial cable installation.

ELECTRICAL CONDUIT

The Contractor, at its sole expense, may use larger conduit if desired. Where larger conduit is used, it shall be for the entire length of the run from outlet. No reducing couplings will be permitted underground.

Where a “stub-out” is called for on the plans, a conduit sweeping elbow shall be installed in the direction indicated and properly capped. The locations of ends of all conduits in structures or terminating at curbs shall be marked by a “Y” at least 3” high cut into the face of the curb, gutter, or wall directly above the conduit.

Conduit shall be laid at a depth of not less than 24” below the top of curb grade in sidewalk or grassy areas and to a depth of not less than 30” below the finished grade in all other areas. The appropriate railroad authority shall specify and approve conduit under railroad tracks.

All conduit and fitting installations shall conform to the NEC.

The excavations required for the installation of conduit or cable shall be performed in such a manner as to avoid unnecessary damage to streets, sidewalks, landscaping, sprinkler systems and other improvements. Excavation shall not be performed until immediately before installation of conduits. The material from the excavation shall be placed in a position not to cause damage or obstruction to vehicular or pedestrian traffic or interfere with surface drainage.

Trenches shall be made with a rock-wheel or other machine capable of cutting a narrow trench (4") so as to allow traffic to pass over prior to backfilling. The machine shall be equipped with shields to direct the spoil downward and away from passing vehicles, workmen and pedestrians.

Trench excavations for conduit shall be 2” wider than the outside diameter of the conduit. Off-street trenches shall be back-filled with the same material that was removed and shall be compacted and shaped to match the surrounding surface. On-street trenches shall be back-filled by placing concrete or approved flow-fill up to the bottom surface of the existing or new roadway surface material. The remaining portion of the excavation shall be backfilled with the same type of material used to construct the existing roadway surface.

The Contractor shall restore all surface materials including sprinkler systems, landscaping, shrubs, sod grass, and native growth vegetation disturbed by trenching and back-filling operation in kind, equal to or exceeding the original conditions.

The Contractor shall install Conduit entering a pull box, hand-hole, or any other type structure from the direction of the run only.

ELECTRICAL CONDUIT

When a new conduit run enters an existing pull box, the Contractor shall remove the pull box or tunnel under the side at no less than 18” and enter from the direction of the run.

Conduits terminating in a pole shall extend approximately 3” vertically above the foundation.

If the Contractor is unable to jack or bore the conduit at the lengths shown on the plans from pull box to pull box, the Contractor shall furnish and install all splice couplings to splice the conduit. This shall include excavation down to the required depth of conduit at the splice location. Contractor shall repair all landscape to the original condition for excavation of conduit at all splice locations. All splice couplings shall be water and airtight and installed at a depth to match the remaining run of conduit. No elevation difference will be allowed. Splices shall be kept to a minimum and all locations shall be approved by the City. Additional pull boxes shall not be substituted for splices.

Conduit plugs for sealing conduit shall also be supplied and installed in all open conduit ends as soon as the conduit is installed. Plugs shall be durable, fabricated from no metallic parts, be of the split design to allow removal and reinstallation around in-place cables and be easily removable and reusable. Plugs shall be capable of being installed by hand without any tools and shall provide a water and air tight seal of at least 100 psi and shall cause no damage to the cable when installed.

At some locations (as illustrated on the Plans or in these specifications, or as directed by the Engineer), new conduits shall be installed in an existing pull box or manhole. At these locations, the Contractor shall carefully excavate around the pull box or manhole and install the new conduit in the pull box or manhole in a manner that meets the requirements of this Special Provision. The Contractor shall not damage the existing pull box or manhole. If the existing pull boxes, manholes, or concrete collars are cracked or damaged during conduit installation, the Contractor shall be required to replace either or both conforming to the requirements of the contract.

For locations where conduit is installed into asphalt, concrete, or slope pavement, the Contractor shall patch the asphalt, concrete or slope pavement.

BASIS OF PAYMENT

Subsection 613.12 shall include the following:

Electrical Conduit shall include groundwork, sweeps, pull tape, copper tracer wire, adapters, fittings, splice couplings, conduit plugs (for conduits both with and without fiber optic cable), lubricants, anchors, bands, skids, equipment, labor, backfill, and all other items necessary to complete the work. Electrical Conduit shall include patching of asphalt, concrete or slope pavement. Electrical Conduit shall include repair of any Contractor-caused damage to existing pull boxes or manholes. Electrical Conduit shall include all landscape restoration for excavation of conduit at all splice locations.

Payment will be made under:

Pay Item Pay Unit

2 Inch Electrical Conduit

2 Inch Electrical Conduit (Bored)

3 Inch Electrical Conduit

Linear Foot

Linear Foot

3 Inch Electrical Conduit (Bored) Linear Foot

PULL BOX

Section 613 of the Standard Specifications is hereby revised for this project to include the following:

DESCRIPTION

Subsection 613.01 shall include the following:

This work consists of furnishing and installing precast fiberglass-reinforced polymer concrete pull boxes at locations shown on the plans or established.

MATERIALS

Subsection 613.02 shall include the following:

Pull boxes in finished areas shall be designed for such installations and shall be stackable and manufactured of a precast fiberglass-reinforced polymer concrete material. Pull boxes shall be designed to support a minimum service load of 20,000 pounds over a 10 inch by 10 inch square. Pull boxes shall be verified by a 3rd Party

Nationally Recognized Independent Testing Laboratory as meeting all test provisions of the current edition of the

Society of Cable Telecommunications Engineers (SCTE) 77, Specification for Underground Enclosure Integrity, Tier 22 rating. Pull boxes shall be Underwriters Laboratories (UL) listed. Certification documents shall be submitted with material submittals.

Pull boxes shall have a detachable cover with a skid-resistance surface. Pull box labels to be TRAFFIC SIGNAL, TRAFFIC ELECTRIC, or COMMUNICATION, as approved by the Traffic Engineer through materials submittal process. The cover shall be attached to the pull box body by means of screw-in bolts and shall have two lift slots in each lid to aid in the removal of the lid. Non-standard bolts shall not be used. Lift slots shall be rated for 3,000 pounds.

Pull boxes 30 inches by 48 inches and larger shall have removable split lids with a removable metal center support brace. Lid segment weight shall not exceed 100 pounds.

Pull boxes that are to be in traveled ways shall be outfitted with traffic bearing lids rated for HS 20-44 loads.

CONSTRUCTION REQUIREMENTS

Subsection 613.03 shall include the following:

A pull box shall always be installed in combination with steel strain type poles, signal mast arm type poles, at other locations specified on the plans, and as directed by the Engineer. The Contractor may be permitted to install, at their own expense, any additional pull box that is desired to help facilitate the work, with the approval of the Engineer.

A minimum of 12 inches of ¾ inch granite-gravel shall be installed as a base for the pull box. The granite-gravel shall be free of dirt and debris and spread evenly to facilitate a level base for the pull box. The Contractor shall ensure that sufficient compacting is made prior to the installation of granite-gravel to alleviate future settling. The granite-gravel base shall be covered with woven wire.

Pull boxes shall be installed so that the covers are level with curb or sidewalk grade or level with the surrounding ground when no grade is established.

Pull boxes shall be installed in accordance with the City of Centennial Roadway Design and Construction

Standards.

A ground electrode shall be installed at each pole, pedestal, and control box. Each ground electrode shall be one-piece copper-weld rod of 5/8 inch diameter, and 8 feet in length, driven to a depth of at least 8 feet below the surface of the ground.

PULL BOX

METHOD OF MEASUREMENT

Subsection 613.11 shall include the following:

Pull Box will be measured by the actual number of pull boxes installed and accepted.

BASIS OF PAYMENT

Subsection 613.12 shall include the following:

Pull Box shall include the removal of any existing pull box (in the case of replacement), installation of the new pull box, modification of conduit ends, restoration of disturbed surface materials, and all other work necessary to complete the installation. Pull Box shall include base, lid(s), center support brace, required wording or graphics on lid, skid-resistance surface, lift slots, stainless steel bolts, excavation, backfill, and ¾ inch granite-gravel. Pull

Box shall include the removal and patching of pavement, sidewalks, curb and gutters, and their replacement in kind to match existing grade.

Payment will be made under:

Pull Box (24”x36”x18”) Each

REVISION TO SECTION 614

TRAFFIC SIGNAL CONTROLLER CABINET

Section 614 of the Standard Specifications is hereby revised for this project to include the following:

DESCRIPTION

Subsection 614.01 shall include the following:

This work shall consist of furnishing and installing a complete Traffic Signal Controller Cabinet including ancillary hardware. Traffic Signal Controller Cabinet shall conform to the requirements in the standard titled

ATC 5301 v02.02 Advanced Transportation Controller (ATC) Cabinet Standard Version 02.

This document can be downloaded online from the following link:

http://www.ite.org/technical-resources/standards/its-cabinet/version-2/

MATERIALS

Delete subsection 614.08(c) and replace with the following:

The controller cabinet shall be a Model 350i ATC Cabinet or approved equal.

METHOD OF MEASUREMENT

Subsection 614.13 shall include the following:

Traffic Signal Controller Cabinet shall include all labor, materials, ancillary hardware, wiring required to provide a fully functional system. Traffic Signal Controller, Traffic Signal Cabinet Base, and Malfunction Management

Unit shall not be measured or paid for separately, but shall be included in the work. See Revision to Section 614

Traffic Signal Controller for specifications on the traffic signal controller.

BASIS OF PAYMENT

Subsection 614.14 shall include the following:

Payment will be made under:

Traffic Signal Controller Cabinet Each

TRAFFIC SIGNAL CONTROLLER

Section 614 of the Standard Specifications is hereby revised for this project to include the following:

DESCRIPTION

Subsection 614.01 shall include the following:

This work shall consist of furnishing and installing a complete Traffic Signal Controller including ancillary hardware.

MATERIALS

Delete subsection 614.08(b) and replace with the following:

The traffic signal controller shall be an Econolite Cobalt controller (Model Number COBCRM21100 – Cobal C-

Series RM EOS Power Cord). The Traffic Signal Controller shall consist of a controller unit and all necessary auxiliary equipment to provide a fully operational system.

The manufacturer shall warranty the controller for two (2) years from the date of delivery.

CONSTRUCTION REQUIREMENTS

Subsection 614.10 shall include the following:

The Contractor shall deliver the controller and accessories, with control cabinet, to the City at least 10 working days prior to installation for programming. Ethernet configuration, and setup. The Contractor shall pick up the controller and shall install it per manufacturer recommendations at the location designated by the Engineer.

BASIS OF PAYMENT

Subsection 614.14 shall include the following:

The item shall include all labor, materials, equipment, wiring, and ancillary hardware required to provide a fully functioning system to the satisfaction of the Engineer. The Traffic Signal Controller itself shall not be paid for separately but shall be included in the work for the Traffic Signal Controller Cabinet.

TRAFFIC SIGNAL POLES

Section 614 of the Standard Specifications is hereby revised for this project to include the following:

DESCRIPTION

Subsection 614.01 shall include the following:

This specification involves the furnishing and installation of traffic signal poles and mast arms.

MATERIALS

Subsection 614.08(g) shall include the following:

Traffic signal poles, including mast arms, mast arm extensions, luminaire pole extensions, anchor bolts and nuts, herein referred to as the “Traffic Signal Poles” will be furnished by the Contractor. Manufacturer shop drawings stamped by a Colorado licensed PE and prepared in accordance with the City of Centennial signal pole design and loading standards shall be submitted for City review and approval prior to procurement and installation.

CONSTRUCTION REQUIREMENTS

(k) Traffic Signal Poles

Handling and Shipment. Traffic Signal Poles shall be handled in a manner that will preserve the overall appearance and prevent damage to the coating. The use of chains or cables for loading, unloading, or installing is prohibited. Only ¾ inch diameter or larger nonabrasive nylon rope or equivalent nylon belting will be used. Adequate hold-downs and appropriate blocking shall be utilized for shipping to prevent load movement and damage to the outer coating in transit. No handling should be allowed until

“dry through” condition has been achieved with the coating.

Delivery, Installation, and Acceptance of Traffic Signal Poles. Extra care shall be taken not to damage the coating. Upon arrival of the Traffic Signal Poles at the Delivery Point, neither chains nor cables may be used for either unloading or installation of the Traffic Signal Poles. The Contractor shall store and protect the Traffic Signal Poles in the Contractor’s yard upon delivery. The Contractor shall transport the

Traffic Signal Poles from the Delivery Point to the job site for installation. The Contractor shall assemble and install the Traffic Signal Poles as shown on the plans, unless otherwise directed by the Engineer, using manufacturer-supplied hardware.

TELEMETRY (FIELD)

Section 614 of the Standard Specifications is hereby revised for this project as follows:

DESCRIPTION

Subsection 614.01 shall include the following:

This work consists of fan-out and termination of fiber optic (interconnect) cable at each controller cabinet location identified in the plans. It is also to include installation and connection of all necessary telemetry equipment including: ethernet switches, fiber optic transceivers, computer stations, patch panels, splice organizers, interface panels, optical splice closures, serial cables and pigtails. The Contractor shall be responsible for properly making all fiber optic cable connections to each modem within each controller cabinet, and as described in the plans.

ETHERNET MANAGED SWITCH

An Ethernet Managed Switch shall only be used where specified in the plans and project special provisions, and may be considered by the Engineer on a per project basis. When specified in the project plans and project specials, the Ethernet Managed Switch shall be of the manufacturer and model number specified.

An Ethernet Managed Switch shall include all labor, equipment, and materials necessary to install the item complete-in-place, including, but not limited to, power supplies, Ethernet cables, serial cables, and fiber patch cords.

Unless otherwise specified, the Contractor shall be responsible for proper programming, setup, and testing of the Ethernet Managed Switch. At the City’s discretion, the City may opt to have their Maintenance Contractor or other third party complete Ethernet Managed Switch, setup, and/or testing. When the City’s Maintenance

Contractor or other third party is enlisted for programming, setup, and/or testing of the Ethernet Managed

Switch, associated costs for the Maintenance Contractor or third party labor shall be the responsibility of the

City.

FIBER OPTIC TRANSCEIVERS

Fiber Optic Transceivers shall only be used where specified in the plans and project specials, and may be considered by the Engineer on a per project basis. When specified in the project plans and project specials, Fiber Optic Transceivers shall be of the manufacturer and model number specified.

Fiber Optic Transceivers shall include all labor, equipment, and materials necessary to install the item complete-in-place, including, but not limited to, fiber optic transceiver card racks, power supplies, serial cables, and fiber patch cords.

Unless otherwise specified, the Contractor shall be responsible for proper programming, setup, and testing of the Fiber Optic Transceivers. At the City’s discretion, the City may opt to have their Maintenance Contractor or other third party complete Fiber Optic Transceivers programming, setup, and/or testing. When the City’s

Maintenance Contractor or other third party is enlisted for programming, setup, and/or testing of the Fiber

Optic Transceivers, associated costs for the Maintenance Contractor or third party labor shall be the responsibility of City.

OPTICAL SPLICES AND OPTICAL SPLICE CLOSURES

Splices are not allowed without the authorization of the Engineer. If splices are authorized or specified on the plans, each such splice shall occur in a pull box of adequate size to house the splice closure and fiber optic cable slack without exceeding the fiber cable minimum bend radius. All splices shall be enclosed in a splice closure. Following successful splicing, said splice enclosure and fiber optic cable slack shall be placed inside the pull box.

TELEMETRY (FIELD)

When fiber splicing is specified in the plans, splicing diagrams shall be provided by the City. Splicing diagrams shall define fiber cables to be spliced in part or whole and shall provide buffer tube designation, fiber designation, and routing information of each fiber to be spliced.

The Contractor shall accomplish the fiber splicing work using industry standard splicing tools and hardware.

Splice closures shall be used for splicing lateral fiber optic cable runs to the main fiber optic cable (backbone) at pull box locations that are identified in the plans. All closures shall include a 1-inch future port kit. The size of the splice closure at specific locations shall be governed by the number of cables and splices required.

BUFFER TUBE FAN-OUT

Fiber fan-outs shall be completed as defined in the plans and/or special provisions. Only those buffer tubes defined shall be fanned out. When additional buffer tubes are present, but are not to be fanned out, a termination panel shall be required. Buffer tubes which have not been fanned out shall be loosely coiled and secured within a termination panel.

Fiber fan-outs shall only be completed within a building or NEMA 4 rated cabinet and shall be of the count and type as defined in the plans and/or special provisions.

Industry standard fan-out kit tools and tool kit consumables shall be used.

During installation, and at no time, shall the fiber fan-out, in part or whole, be reduced to a length shorter than

36 inches. Fiber fan-outs shorter than 36 inches shall be replaced by the Contractor. Fees associated with replacement of fiber fan-outs which were installed by the Contractor, but which do not meet specifications, including terminations and testing, shall be borne by the Contractor and shall not be chargeable to the City.

TERMINATIONS

Only those fibers defined shall be terminated. All other fibers shall remain uncut.

Connectors shall be “ST” type unless otherwise specified. The connectors shall have a ceramic ferrule with nickel-plated nut and body. The connectors shall be compatible with a physical contact (PC) finish.

All connectors shall be polished to a PC finish such that the return loss per mated pair of connectors is less than -25 dB.

The return loss when the connector is mated with a previously installed connector shall be less than -18 dB.

The connector’s insertion loss shall not be greater than 0.20 dB (typical). The connector’s loss shall not vary more than 0.20 dB after 1000 repeated matings. Tensile strength shall withstand an axial load of 20 lbs with less than 0.20 dB change.

Index matching fluids or gels shall not be used. The connectors shall be compatible with the optical fiber surrounding jacket and shall be installed on one end of the optical fiber in accordance with the manufacturer’s recommended materials, equipment, and practices. The connectors shall be suitable for the intended environment and shall meet, or exceed, the following environmental conditions.

• Operating Temperature: -40 degrees C to +80 degrees C

• Storage Temperature: -40 degrees C to +85 degrees C

The connector loss shall not vary more than 0.20 dB over the operating temperature range. Connectors shall be protected by a suitably installed waterproof protective cap.

TELEMETRY (FIELD)

Subsection 614.13 shall include the following:

Telemetry (Field) shall be measured by the total number of terminals (i.e. cabinets and/or computer stations) at which the interconnect cable is fanned out, terminated, connected, patch panels and fiber-optic interfaces installed. All labor and materials required to perform panel installations, provide in-cabinet strain relief, fan-out, cable termination and connection to the controller is considered included in the unit price for this item.

This item, therefore, includes the following:

1. All required in-cabinet cable ties and strain relief (including ancillary hardware and labor to complete);

2. All required fan-out kits, kit tools, ancillary hardware and labor to accomplish the fan-out at the cabinet;

3. All required pigtails and harness cables;

4. All required interconnect transceivers and switches, and fiber optic interface panels in individual controller cabinets as shown in the plans;

a. All required termination enclosures (including specified features), connectors, adapters, jumpers, pigtails, patch cord cables, ancillary hardware and labor required to accomplish the cabinet termination;

b. All required optical splice closures;

c. All other labor and material necessary to complete the item.

All labor, materials and testing necessary to complete this item to the satisfaction of the engineer shall be considered included in the unit price and will not be paid separately.

Subsection 614.14 shall include the following:

Payment will be made under:

Telemetry (Field) Each

UNINTERRUPTED POWER SUPPLY SYSTEM

Section 614 of the Standard Specifications is hereby revised for this project to include the following:

DESCRIPTION

Subsection 614.01 shall include the following:

This work shall consist of furnishing a fully functional, self-contained, traffic signal Uninterrupted Power

Supply (UPS). All components, cables, or wiring necessary, in addition to those specified in this specification, shall be installed or supplied with the specified traffic signal battery backup system.

MATERIALS

Subsection 614.08 shall include the following:

(a) UPS Panel

1. The UPS panel shall include a UPS bypass and UPS isolation switch.

2. The UPS shall include a dead-front safety panel board with all switches and plugs pre-wired with nameplates.

3. All nameplates shall be phenolic UV resistant plastic laminated engraved type.

4. All wire terminating lugs shall be full wrap around type.

5. All batteries shall be captive spaced from external captive sides in earthquake proof shelving.

6. Enclosure ventilation shall be by (qty. 2) 4 in. x ¼ in. louvers top and bottom with encapsulated bug screens, cleanable filters and a 100 cubic feet per minute (cfm) fan to completely exchange air a minimum of 25 times per minute.

7. All UPS panel DC terminals and connections shall incorporate safety covers such that the safety covers are in place for every normal maintenance mode.

8. The UPS panel shall include event counters and a total run time counter.

(b) UPS Unit

1. The UPS unit shall provide for utility service isolation when in operation.

2. The UPS unit shall provide a true sine-wave output with minimum 2000 Volt-Amp continuous capacity. The minimum rating for wattage output shall be 1200 watts.

3. The UPS unit shall include quick make/break connectors and plugs. Systems requiring hard wiring termination to/from the inverter are unacceptable.

UNINTERRUPTED POWER SUPPLY SYSTEM

4. The UPS unit shall include transient voltage surge protection per IEEE 62.41, common mode clamping at 0ns < 5ns typical per UL 1449, transient lighting protection per IEEE 62.41, and conditioned power at computer quality.

5. The UPS unit shall be capable of running an intersection in operation with LED type traffic signal head lights. The typical system run time shall be between (6) six to (12) twelve hours of full operation, based on the actual load.

6. The UPS unit shall operate off-line.

A. The minimum transfer to battery time shall be 2-4 ms, B. The minimum retransfer to utility time shall be 2-4 ms

C. The UPS unit shall include a battery condition indicator, with automatic test provisions, and with hot-swappable batteries for all batteries in the system.

7. The UPS unit shall automatically recharge batteries from full discharge to 90% capacity within 8 hours.

8. The UPS unit shall provide on-line operation for a minimum input of 90 to 150 VAC, provide full load output of 120VAC – 10% / +4% at 60 Hz +/- 0.05% over a temperature range of -37° C (-

34.6° F) to +74° C (165.2° F).

9. The UPS unit shall conform to and be based on a UL Approved Design.

10. The UPS unit inverter shall not exceed 40 pounds.

11. The UPS unit shall be delivered with maintenance manuals.

12. Fan cooling shall be fused for locked rotor current.

13. Cooling air shall be ducted to cool the front and back of each battery with air space on all four sides and top of the battery.

14. Inverter covers shall be 60% open on both sides.

15. The UPS unit shall include USB & RS232, DB9 computer interface ports.

16. The UPS unit shall include a 24V DC design. Systems higher than 24V DC are unacceptable.

17. The UPS Unit shall include web SMNP/Ethernet IP addressable communication with software.

(c) UPS Communications Module

1. All inverter terminations shall be made in slots provided in a relay I/O module without the use of tools. This includes: A/C-Input, A/C-Output, Normally-Open, and Normally-Closed programmable contacts.

2. Terminations to the relay I/O module shall include:

A. Input #1 - Turn the UPS on.

B. Input #2 - Turn the UPS off.

C. Input #3 - Start the UPS self-test.

D. Input #4 - Shut down the UPS (when on battery).

E. Output #1 - The UPS is on-battery (during a power failure, self-test or run time calibration).

F. Output #2 - UPS has a low battery – Programmable.

G. Output #3 - The protected load is not receiving power from the UPS.

H. Output #4 - Replace the UPS batteries.

I. Output #5 - The UPS is overloaded.

J. Output #6 - Any UPS fault or self-test failure.

(d) Batteries

1. Each battery shall be maintenance-free, type AGM/VRLA (Absorbed Glass Mat / Valve

Regulated Lead Acid).

2. Each battery shall be 24 volts at 18 AH.

UNINTERRUPTED POWER SUPPLY SYSTEM

3. Each battery shall be furnished with heavy-duty 50 amp rated silver-plated connectors that form a reliable weather and vibration resistant connection.

A. Battery connectors shall be genderless.

4. Each battery shall be independently pre-wired and individually fused with a 100 Amp internal fuse. Series wiring is unacceptable.

5. Each battery shall have a maximum weight of 26 lbs.

6. Batteries shall be hot swappable. Replacement batteries shall ship in a reusable box to allow for exhausted batteries to be shipped to a recycling center.

(e) Power System Analyzer and Conflict Resolution Module

1. The inverter shall incorporate an integrated power system analyzer and conflict resolution system.

2. The power system analyzer shall evaluate and make limited adjustments to the incoming utility power and shall automatically transfer load to the battery back-up power if utility power is lost.

3. When utility power becomes available after power is lost, the UPS shall verify power stability and return to normal operation.

4. The system shall provide automatic UPS failure detection, and shall automatically isolate the failed UPS and lock the unit on to utility power. The system shall return to normal operation once the failure has been corrected.

5. The UPS shall include a manual power transfer switch with UPS bypass.

6. The UPS shall include an automatic power transfer switch.

(f) Triple Bypass System for Offline UPS

1. The UPS shall utilize a triple bypass system when it is offline. The triple bypass system shall include the following components:

A. Power analyzer with conflict monitor isolation and transfer module.

B. The power conflict monitor shall be a completely redundant failsafe system. It shall continuously monitor available load bus power. If load bus power fails for 5 ms the power conflict monitor shall transfer and isolate the UPS and so that power will be locked on.

C. Timer - the timer shall provide a redundant 5 ms delay and transfer to utility power.

D. Outboard Transfer Switch – the outboard transfer switch shall not interrupt the normal traffic signal controller function. Transfer time shall be 2 ms.

E. Onboard I/O Module – the onboard I/O module will execute lockout of battery backup system upon detection of any inverter UPS fault. If the UPS resets itself, then the UPS shall automatically be available for backup.

F. Timed Relay – the inverter shall go through a timed relay for full time control of output from 0 to 10 hours.

(g) Battery Charger

1. The battery charger shall charge the battery from full discharge to 90% fully charged in less than

8 hours.

2. The battery charger shall utilize battery management to extend battery life.

(h) Battery Management

1. Battery management shall include automatic battery load tests.

2. Battery management shall include redundant overcharge protection.

3. Battery management shall include regulating under and over voltages without switching to battery.

UNINTERRUPTED POWER SUPPLY SYSTEM

4. The battery charger shall perform a self-test automatically every two weeks, or anytime when manually activated. Manual self-tests shall be available with software or locally at the device. A continuously lit battery replacement indicator light when batteries need replacement shall be included on the device. The software used to communicate to the UPS shall also indicate when batteries need replacement.

5. The inverter battery charging systems shall be microprocessor controlled.

(i) Warranty

1. Manufacturers shall provide a two (2) year factory-replacement parts warranty on the UPS.

2. Batteries shall be warranted for full replacement for two (2) years.

3. The warranty shall be included in the total bid price of the UPS.

CONSTRUCTION REQUIREMENTS

The Contractor shall deliver the UPS and accessories to the City at least 10 working days prior to installation for

Ethernet configuration and setup. The Contractor shall pick up the UPS and shall install it at the location designated by the Engineer.

The Contractor shall install the UPS, batteries, and related equipment and hardware in accordance with the manufacturer’s recommendations to provide a fully functional UPS system.

The Contractor shall route the power and data cabling within the traffic signal cabinet and connect the traffic signal cabinet and components to UPS power.

METHOD OF MEASUREMENT

Subsection 614.13 shall include the following:

Uninterrupted Power Supply system shall be measured by the actual number of UPS systems installed and accepted.

BASIS OF PAYMENT

Subsection 614.14 shall include the following:

Uninterrupted Power Supply system shall include all auxiliary equipment required on the plans and shall include all work necessary to provide and install a fully functional system.

Payment will be made under:

Uninterrupted Power Supply Each

FORCE ACCOUNT ITEMS

DESCRIPTION

This special provision contains the Department's estimate for force account items included in the Contract. The estimated amounts marked with an asterisk will be added to the total bid to determine the amount of the performance and payment bonds. Force Account work shall be performed as directed by the Project Engineer.

BASIS OF PAYMENT

Payment will be made in accordance with Subsection 109.04. Payment will constitute full compensation for all work necessary to complete the item.

Force account work valued at $5,000 or less, that must be performed by a licensed journeyman to comply with federal, state, or local codes, may be paid for after receipt of an itemized statement endorsed by the Contractor.

Estimated

Force Account Item Quantity Amount

700-70010 Minor Contract Revisions F.A. $100,000

700-70082 Furnish & Install Electrical Services F.A. $30,000

Force Account Descriptions:

700-70010 F/A Minor Contract Revisions - This work consists of minor work authorized and approved by the Project

Engineer which is not included in the Contract drawings or specifications and is necessary to accomplish the scope of work of the Contract.

700-70082 F/A Furnish & Install Electrical Services – This force account is to pay for installing all necessary electrical equipment and infrastructure.

UTILITIES

Known utilities within the limits of this project are:

UTILITY OWNER

CONTACT

NAME

PHONE # EMAIL

CenturyLink (aka Lumen) William Benson 303-587-5496 william.benson@lumen.com

ATT Transmission 800-288-2020

Southgate Water & Sanitation

District David Kahlich

303-779-0261

432-770-4997 admin@southgatedistricts.org

City of Centennial Fiber Wyatt Peterson 303-325-8000 centennialplanning@centennialco.gov

South Suburban Park &

Recreation Dept.

Melissa Reese-

Thacker 303-795-9856

MelissaR@ssprd.org

Comcast John Etter 720-256-3778 john_etter@comcast.com

East Cherry Creek Valley Water

& San District Sherlrine Hoy

303-693-3800 x157 shoy@eccv.org

Willows Water District Not available 303-770-8625 customerservice@willowswater.org

Xcel Energy Kevin Johnson 719-549-3615 kevin.johnson@xcelenergy.com

Ting Fiber Inc constructionexperience@ting.com

Denver Water Dept. Paul Peloquin 303-628-6620 paul.peloquin@denverwater.org

Level 3 Now Lumen 877-366-8344 nationalrelo@centurylink.com

Zayo Bandwidth Geoff Armstrong 303-505-3491 geoff.amstrong@zayo.com

Southeast Metro Storm Water

Authority Tiffany Clark 303-858-8844 semswamain@semswa.org

The work described in these plans and specifications requires coordination between the Contractor and the utility companies in accordance with CDOT Construction Manual Subsection 105.11 in conducting their respective operations as necessary to complete the utility work with minimum delay to the project.

The work listed below shall be performed by the Contractor in accordance with the plans and specifications, and as directed by the Engineer. The Contractor shall keep each utility company advised of any work being done to its facility, so that the utility company can coordinate its inspections for final acceptance of the work with the

Engineer.

PART 1 CONTRACTOR SHALL PERFORM THE WORK LISTED BELOW:

The Contractor shall verify the location and depth of existing facilities at potential utility conflicts, and coordinate with the utility owner if a relocation, support, or adjustment to raise/lower/protect lines is needed. If a conflict is determined the Contractor shall expose the utility owner’s line if requested by the utility owner so that the utility owner can relocate, support, or adjust to raise/lower/protect as needed. For relocations or adjustments that are expected to be done prior to construction, the Contractor shall coordinate with the utility owner regarding the status of the work and receive as-built information from the utility owner upon completion.

The Contractor shall remove abandoned utility facilities as necessary to accommodate construction of proposed work. The Contractor shall verify with the utility owner if the facility has been abandoned prior to removal.

mailto:%20william.benson@lumen.com mailto:admin@southgatedistricts.org mailto:centennialplanning@centennialco.gov mailto:MelissaR@ssprd.org mailto:shoy@eccv.org mailto:customerservice@willowswater.org mailto:kevin.johnson@xcelenergy.com mailto:constructionexperience@ting.com?subject=Construction%20support%20inquiry%20 mailto:paul.peloquin@denverwater.org mailto:nationalrelo@centurylink.com mailto:geoff.amstrong@zayo.com mailto:semswamain@semswa.org

The Contractor shall follow the utility standards of the Colorado Department of Transportation (CDOT) and the

City of Centennial as applicable. Discrepancies between the standards shall be coordinated with the Project

Engineer.

Power source connection coordination

The Contractor shall be responsible for the coordination of power source work to be performed by Xcel Energy.

The Contractor shall submit a Builders Call Line (BCL) Application for electrical services for Xcel Energy work element that is to be coordinated with this project. A separate application is required for each electrical service.

The request is to be processed through Xcel Energy Builder’s Call Line at 1-800-628-2121 or

BCLCO@Xcelenergy.com. The name of the owner for each meter or flat-rated service shall be the owner’s name and billing address responsible for paying the utility bill and shall be listed on the BCL application. The

Contractor shall perform the required coordination to establish the power source for the street lighting and traffic signals, as shown on the traffic signals plans. The Contractor shall perform all work necessary to maintain existing or establish new power sources to the devices called for in the plans and per the standard for any metered or flat-rated services. All cost charges from the power service provider, and all necessary materials and labor shall be reimbursed from the F/A Furnish and Install Electrical Service.

High Voltage Electric Transmission Line

The Contractor shall contact the Xcel Energy/Public Service Company of Colorado Electric Transmission Line

Operations Department at 303-883-0089 of 303-638-4085 a minimum of 31 days in advance to arrange for a

Patrolman to be on site during any construction work within an electric transmission line right-of-way. When

Contractor is working near or under a high voltage electric transmission line, it must be assumed that the transmission line is energized, and workers may not be closer than twenty feet (20’) in any direction to the energized transmission lines or conductors. Safety provisions will allow for operations in accordance with

Occupational Safety and Health Act requirements.

Under NO circumstances may work be started within twenty feet (20’) in any direction of the transmission lines or conductors without clearance from the Patrolman. It is the responsibility of the contractor to notify the

Patrolman whenever starting and ending the work.

All Utility Companies

The Contractor will contact each utility company a minimum of 2 business days, not including day of actual notice, unless otherwise noted, prior to working in the utility company’s area so that the utility company can provide an inspector and/or complete any necessary adjustments or relocations.

If a need for utility work by either the Contractor or a Utility Company arises, the following shall apply:

The Contractor shall be responsible for coordinating the adjustment of utilities on this project. The

Contractor shall keep each utility company advised of any work being performed in the vicinity of their facilities, so that each utility company can coordinate any needed locates, adjustments or inspections.

Contractor shall provide the appropriate utility company ample notice, but not less than two (2) working days, not including day of actual notice, prior to commencing activities in the vicinity of their facilities.

Any additional work performed by the Contractor on behalf of the impacted utility company shall not be paid for by the City of Centennial but shall be paid by the utility company requiring the work, unless otherwise agreed to in writing by the Engineer.

Project Limits – All Utility Owners

The Contractor shall identify existing utilities (by potholing if necessary) and protect in place the existing buried utilities when constructing the project, including sub excavation work. When excavation activity is within eighteen inches horizontally from the exterior side of any marked underground facility, the contractor shall use nondestructive means of excavation to identify underground facilities and shall otherwise exercise reasonable care to protect any underground facility in or near the excavation area. When utilizing trenchless excavation methods, mailto:BCLCO@Xcelenergy.com the excavator shall expose underground facilities and visually observe the safe crossing of marked underground facilities and visually observe the safe crossing of marked underground facility.

Xcel Energy

The Contractor shall notify Xcel Energy one week in advance of construction operations commencing near Xcel

Energy facilities.

CenturyLink

The Contractor shall notify CenturyLink one week in advance of construction operations commencing near

CenturyLink facilities.

Comcast

The Contractor shall notify Comcast one week in advance of construction operations commencing near Comcast facilities.

Southgate Water & Sanitation District

The Contractor shall notify Southgate Water & Sanitation District (SWSD)one week in advance of construction operations commencing near SWSD facilities.

East Cherry Creek Valley Water & San District

T…