ntb2619carth00022ad1.pdf

Agenda Nonmandatory Prebid Conference

2026 Airport Electrical and Pavement Improvements TxDOT CSJ No. 2619CARTH

Panola County, Texas April 15, 2026, 11 A.M.

TLB:JDE:cdg\R:\BRE\Documents\Agendas and Minutes\P\Panola County, TX\2026 AP Elec & Pave Imp.2619CARTH.1174.001\(01) Agd\Prebid Agd_Dist.04152026.docx

1. Introduction

2. General Project Description and Overview

a. Project Description

b. Bidding

c. Disadvantaged Business Enterprise (DBE) Requirements

d. Bid Delivery

e. General Provisions

3. Addenda c: All Participants

Addendum No. 1

Minutes Nonmandatory Prebid Conference

2026 Airport Electrical and Pavement Improvements TxDOT CSJ No. 2619CARTH

Panola County, Texas April 15, 2026, 11 A.M

TLB:JDE:cdg\R:\BRE\Documents\Agendas and Minutes\P\Panola County, TX\2026 AP Elec & Pave Imp.2619CARTH.1174.001\(02) Min\Prebid Mins.04152026.docx

1. Introduction of those Present–The following people were in attendance at the conference:

Attendees Representing Contact Robert Duncan, Airport Manager

Panola County (Owner)

Tel: 903-690-2833 E-mail: airport.manager@co.panola.tx.us

Billy Alexander Panola County Tel: 903-690-6213 E-mail: balexander@co.panola.tx.us

Rodger McLane Panola County Tel: 903-754-3899 E-mail: rodger.mclane@co.panola.tx.us

Pamela Pate Panola County E-mail: pam.pate@co.panola.tx.us Earl Spurlock Texas Department of

Transportation–Aviation Division (TxDOT)

Cell: 512-658-9270 E-mail: earl.spurlock@txdot.gov

Caitlin McGuingle, P.E. Texas Department of Transportation–Aviation Division

Tel: 737-256-9075 E-mail: caitlin.mcguingle@txdot.gov

Ryan Hindman, P.E., Project Manager

Texas Department of Transportation–Aviation Division

Cell: 512-520-7467 E-mail: ryan.hindman@txdot.gov

Daniel Prior Enterprise Commercial Paving, Inc.

(Enterprise)

Tel: 713-206-1107 E-mail: dprior@ecpaving.com

Emily Frank Texas Materials Group, Inc.

(Texas Materials)

Tel: 936-635-3324 E-mail: emily.frank@texasmaterials.com

Jody Herrington Texas Materials Group, Inc. Tel: 936-465-7881 E-mail: jody.herrington@texasmaterials.com

Clayton Zuber Allen Keller Company (Allen Keller)

Cell: 830-377-7691 E-mail: czuber@allenkellerco.com

Brandon Alcala Don Jackson Construction, Inc.

(Don Jackson)

Cell: 214-790-5903 E-mail: info@djctx.com

Jared Engelke, P.E., Project Manager

Strand Associates, Inc.® (Engineer)

Tel: 979-836-7937 ext. 6203 E-mail: jared.engelke@strand.com

Thomas Berry Strand Associates, Inc.® Tel: 979-836-7937 ext. 6258 E-mail: thomas.berry@strand.com

2. General Project Description and Overview

a. Project Description

(1) Base Bid

(a) Replace the low intensity runway (RW) light system with a light-emitting diode (LED) medium intensity runway light system, including LED guidance signs.

(b) Replace the electrical vault.

(c) Replace the precision approach path indicator system (both RW ends).

(d) Replace the beacon and beacon tower with an LED beacon and tip-down tower.

(e) Remove the existing wind cone.

(f) Replace the existing wind cone and segmented circle.

(g) Reconstruct RW 17-35.

(h) Reconstruct Taxiway (TW) A.

Nonmandatory Prebid Conference Minutes TxDOT CSJ No. 2619CARTH

April 15, 2026, 11 A.M.

TLB:JDE:cdg\R:\BRE\Documents\Agendas and Minutes\P\Panola County, TX\2026 AP Elec & Pave Imp.2619CARTH.1174.001\(02) Min\Prebid Mins.04152026.docx

(i) Reconstruct cross TWs.

(j) Remove the existing cross TW.

(2) Alternate Bid No. 1–Reconstruct the hangar access TW and apron.

b. Bidding–Bidders must Bid on the Base Bid and Alternate Bid No. 1.

c. Disadvantaged Business Enterprise Requirements–This is not applicable for this project.

d. Historically Underutilized Business (HUB) Requirements

(1) Respondents are encouraged to maximize the HUB utilization equal to the statewide

HUB goals for the type of work being contracted.

(2) Contact Eli Lopez with TxDOT via telephone at 512-902-0806 or e-mail at eli.lopez@txdot.gov if there are questions.

e. Bid Delivery–Sealed Bids for the airport improvements construction project at the Panola County Airport–Sharpe Field need to be addressed and delivered to Bandy Schwettmann, TxDOT Aviation Division, 6230 East Stassney Lane, 2nd Floor, Austin, TX 78744. The delivered package must be clearly marked as “Bid Proposal.” Bids will be received until 2 P.M. on April 29, 2026, and then publicly opened and read. Any bids received after closing time will be returned unopened.

f. General Provisions

(1) Contract Time–175 calendar days for Base Bid and 14 days for Alternate Bid No. 1.

(2) Liquidated Damages–$1,000 per calendar day

(3) Bid Form should be completed online and then signed with ink.

(4) Each bidder must be prequalified or submit qualification statements with Bids.

3. Addenda

a. There are no addenda at this time.

b. Addendum No. 1 will include the following:

(1) Sign-in sheet.

(2) Prebid Conference Agenda.

(3) Issues or clarification from the Prebid Conference.

c. The deadline for questions from contractors is 5 P.M. on April 17, 2026, and Addendum No. 1 will be posted on April 22, 2026.

4. Questions and comments from Prebid Conference

a. Don Jackson asked where the treated base stop on TW A should be located. Engineer stated the Geotechnical Investigation for Panola County–Sharpe Field Airport (prepared by Rodriguez Engineering Laboratories, LLC and dated April 9, 2025) outlines the locations of the bores along TW A where the treated base was encountered.

b. Don Jackson asked whether Owner wants the pavement and base material removed by the contractor awarded the project. Engineer stated that the Drawings indicate Owner would like to keep this material and requests that contractor coordinate with Owner to identify a suitable location for storage of this material.

Nonmandatory Prebid Conference Minutes TxDOT CSJ No. 2619CARTH

April 15, 2026, 11 A.M.

TLB:JDE:cdg\R:\BRE\Documents\Agendas and Minutes\P\Panola County, TX\2026 AP Elec & Pave Imp.2619CARTH.1174.001\(02) Min\Prebid Mins.04152026.docx

c. Allen Keller asked whether water is available for construction and, if available, where can the contractor obtain the water. Owner stated that there is a location approximately 1.5 miles from the Panola County Airport–Sharpe Field where water can be purchased from the City of Carthage, Texas.

d. TxDOT stated all parties should download the Bid documents from the TxDOT Web site as soon as possible.

If there are any additions or comments, please call 979-836-7937.

Prepared and respectfully submitted by Jared D. Engelke, P.E.

Enclosure c/enc: All Attendees

Panola County Airport - Sharpe Field Modifications to Item L-109 2026 Airport Electrical and Pavement Improvements

Modification to Item L-109 Airport Transformer Vault and Vault Equipment 1

Modification to Item L-109 Airport Transformer Vault and Vault Equipment

Item L-109, “Airport Transformer Vault and Vault Equipment”, of the Standard Specifications is amended with respect to the clauses cited below. No other clauses or requirements of this Item are waived or changed.

Section 109-1.1., This section is voided in its entirety and replaced by the following:

“This item shall consist of furnishing and installing a new precast concrete vault, to fully meet these specifications in accordance with the design and dimensions shown in the plans. This work shall also consist of furnishing and installing the necessary electrical connections, breakers, regulator, system controls/wiring/cabinetry, power/control wiring, S-1 cutout, photocells, relays, enclosures, conduit, grounding system, automatic transfer switch, and all incidentals necessary to produce completed and working medium-intensity runway lighting (MIRL), precision approach path indicators (PAPI), beacon, and lighted wind cone systems. Also included in this work is the marking and labeling of equipment; the labeling or tagging of wires; the testing of the installation; coordination with the utility company; and the furnishing of all incidentals necessary to place the airfield lighting systems in operating condition as completed units to the satisfaction of the Engineer.”

Section 109-3.2., “Concrete.” The first paragraph is voided in its entirety and replaced with “The concrete for the foundations shall be proportioned, placed, and cured per TxDOT Item 360. Concrete shall be Class C.”

Section 109-3.15., “Vault prefabricated metal housing.” This section is voided in its entirety.

Section 109-3.16., “FAA-approved equipment.” The following is removed from this section.

“AC 150/5345-13 Specification for L-841 Auxiliary Relay Cabinet Assembly for Pilot Control of Airport Lighting Circuits.”

“AC 150/5345-56 Specification for L-890 Airport Lighting Control and Monitoring System (ALCMS)”

Section 109-3.17., “Other electrical equipment.” The following is removed from this section.

“Distribution transformers, oil switches”

“of the existing systems or”

“rating whichever is greater”

Section 109-3.18.a., “Control circuits.” The second sentence of this section is voided in its entirety.

Section 109-3.18.b., “Power circuits.” The second item of this section is voided in its entirety.

(Addendum No. 1)

Modification to Item L-109 Airport Transformer Vault and Vault Equipment 2

Section 109-4.1., “General.” “construct the transformer vault or prefabricated metal housing” is replaced by “install a new precast concrete vault” in the first paragraph.

Section 109-4.1., “General.” The following is removed from the section:

“The metal housing shall be prefabricated equipment enclosure to be supplied in the size specified.”

“or metal housing”

“(3m)”

“(12 mm per 0.3 m)”

“or metal housing”

Section 109-4.5., “Floor drain.” This section is voided in its entirety.

Section 109-4.9., “Light and switches.” “Provide lights and switches within the vault room as indicated in the plan.” is added to the beginning of the first paragraph.

Section 109-4.9., “Light and switches.” The last sentence of the paragraph is voided in its entirety.

Section 109-5.2., “Power supply equipment.” The following is removed from the first paragraph:

“Transformers,”

“booster transformers,”

“as not to obstruct the oil sampling plugs of the oil filled units; and”

Section 109-5.2, “Power supply equipment.” The following is removed from the second paragraph:

“or an emergency power generator”

“all equipment, accessories,”

“The emergency power generator set shall be the size and type specified.”

Section 109-5.3., “Switchgear and panels.” The following is removed from the section:

“Oil switches”

Section 109-6.2., This section is voided in its entirety.

Section 109-6.3., “vault” is added to the first paragraph.

Section 109-6.3., “within an existing vault or prefabricated metal housing” is removed from the end of the first paragraph.

Section 109-7.1., “or prefabricated metal housing” is removed from the first paragraph.

Modification to Item L-109 Airport Transformer Vault and Vault Equipment 3

Section 109-7.1., Items L-109-7.1, L-109-7.2, L-109-7.3, and L-109-7.4 are replaced with the following:

“Item L-109-7.1 Furnish and Install Precast Concrete Electrical Vault on Concrete Foundation;

Furnish and Install New Electrical Equipment and Place into Service All New Airfield Lighting Systems - per lump sum.”

“Item L-109-7.2 Provide and Install 2.5kW 3-Step Ferroresonant L-828 CCR for MIRL Circuit - per lump sum.”

Panola County Airport - Sharpe Field AC 150/5370-10H 2026 Airport Electrical and Pavement Improvements 12/21/2018

Item L-109 Airport Transformer Vault and Vault Equipment 1

Item L-109 Airport Transformer Vault and Vault Equipment

DESCRIPTION

109-1.1 This item shall consist of [ removing an existing airport transformer vault and equipment and; ] constructing an airport transformer vault or a prefabricated metal housing per these specifications and per the design and dimensions shown in the plans. This work shall also include the installation of conduits in the floor and foundation, painting and lighting of the vault or metal housing, and the furnishing of all incidentals that are necessary to produce a completed unit. Included as a separate part under this item or as a separate item where an existing vault is to be used shall be the furnishing of all vault equipment, wiring, electrical buses, cable, conduit, potheads, and grounding systems. This work shall also include the painting of equipment and conduit; the marking and labeling of equipment and the labeling or tagging of wires; the testing of the installation; and the furnishing of all incidentals necessary to place it in operating condition as a completed unit to the satisfaction of the RPR.

This item shall consist of furnishing and installing a new precast concrete vault, to fully meet these specifications in accordance with the design and dimensions shown in the plans. This work shall also consist of furnishing and installing the necessary electrical connections, breakers, regulator, system controls/wiring/cabinetry, power/control wiring, S-1 cutout, photocells, relays, enclosures, conduit, grounding system, automatic transfer switch, and all incidentals necessary to produce completed and working medium-intensity runway lighting (MIRL), precision approach path indicators (PAPI), beacon, and lighted wind cone systems. Also included in this work is the marking and labeling of equipment; the labeling or tagging of wires; the testing of the installation;

coordination with the utility company; and the furnishing of all incidentals necessary to place the airfield lighting systems in operating condition as completed units to the satisfaction of the Engineer.

EQUIPMENT AND MATERIALS

109-2.1 General.

a. Airport lighting equipment and materials covered by advisory circulars (AC) shall be certified in AC 150/5345-53, Airport Lighting Equipment Certification Program (ALECP) and listed in the ALECP Addendum.

b. All other equipment and materials covered by other referenced specifications shall be subject to acceptance through manufacturer’s certification of compliance with the applicable specification when requested by the Engineer.

c. Manufacturer’s certifications shall not relieve the Contractor of the responsibility to provide materials per these specifications. Materials supplied and/or installed that do not comply with these specifications shall be removed (when directed by the Engineer) and replaced with materials that comply with these specifications at the Contractor’s cost.

d. All materials and equipment used to construct this item shall be submitted to the Engineer for approval prior to ordering the equipment. Submittals consisting of marked catalog sheets or shop drawings shall be provided. Submittal data shall be presented in a clear, precise and thorough manner.

Original catalog sheets are preferred. Photocopies are acceptable provided they are as good a quality as the original. Clearly and boldly mark each copy to identify products or models applicable to this project.

Item L-109 Airport Transformer Vault and Vault Equipment 2

Indicate all optional equipment and delete any non-pertinent data. Submittals for components of electrical equipment and systems shall identify the equipment to which they apply on each submittal sheet.

Markings shall be made bold and clear with arrows or circles (highlighting is not acceptable). The Contractor is solely responsible for delays in the project that may accrue directly or indirectly from late submissions or resubmissions of submittals.

e. The data submitted shall be sufficient, in the opinion of the Engineer, to determine compliance with the plans and specifications. The Contractor’s submittals shall be provided in electronic pdf format, tabbed by specification section. The Engineer reserves the right to reject any and all equipment, materials or procedures that do not meet the system design and the standards and codes, specified in this document.

f. All equipment and materials furnished and installed under this section shall be guaranteed against defects in materials and workmanship for a period of at least twelve (12) months from final acceptance by the Owner. The defective materials and/or equipment shall be repaired or replaced, at the Owner’s discretion, with no additional cost to the Owner.

CONSTRUCTION OF VAULT AND PREFABRICATED METAL HOUSING

109-3.1 Electrical vault building. The electrical vault building must comply with NEC Article 110.31, Enclosure for Electrical Installations, Item (A) Electrical Vaults. Construct the building of materials having adequate structural strength for the conditions and installed location, has a minimum fire rating of two or three hours as determined by the authority having jurisdiction (AHJ), and is bullet resistant to minimum UL 752 Level 4.

109-3.2 Concrete. Concrete shall be proportioned, placed, and cured per TxDOT Item 360.

Concrete shall be Class C.

109-3.3 Precast concrete structures. Precast concrete structures shall be furnished by a plant meeting National Precast Concrete Association Plant Certification Program or another Engineer approved third party certification program. Precast concrete structures shall conform to ASTM C478.

109-3.4 Reinforcing steel. Reinforcing steel bars shall be intermediate or structural grade deformed-type bars and shall be per ASTM A615.

109-3.5 Brick. Brick shall be per ASTM C62, Grade SW.

109-3.6 Rigid steel conduit. Rigid steel conduit and fittings shall be per Underwriters Laboratories Standards 6 and 514B.

109-3.7 Plastic Conduit and fittings. Plastic Conduit and fittings shall conform to the requirements of UL-651 and UL-654 schedule 40 polyvinyl chloride (PVC) suitable for use above or below ground.

109-3.8 Lighting. Vault or metal-housing light fixtures shall be of a vapor-proof type.

109-3.9 Outlets. Convenience outlets shall be heavy-duty duplex units designed for industrial service.

109-3.10 Switches. Vault or metal-housing light switches shall be single-pole switches.

109-3.11 Paint.

a. Priming paint for non-galvanized metal surfaces shall be a high solids alkyd primer compatible with the manufacturer’s recommendations for the intermediate or topcoat.

b. White paint for body and finish coats on metal and wood surfaces shall be ready-mixed paint conforming to the Master Painter’s Institute (MPI), Reference #9, Exterior Alkyd, Gloss.

Item L-109 Airport Transformer Vault and Vault Equipment 3

c. Priming paint for wood surfaces shall be mixed on the job by thinning the specified white paint by adding 1/2 pint (0.24 liter) of raw linseed oil to each gallon (liter).

d. Paint for the floor, ceiling, and inside walls shall be per Porter Paint Company 69, 71, and 79 or equivalent. Walls and ceiling shall be light gray and the floor shall be medium gray.

e. The roof coating shall be hot asphalt material per ASTM D2823. Asbestos-free roof coating per ASTM D4479 may be substituted if required by local codes.

109-3.12 Ground bus. Ground bus shall be 1/8 3/4 inch (3 19 mm) minimum copper bus bar.

109-3.13 Square duct. Duct shall be square similar to that manufactured by the Square D Company (or equivalent), or the Trumbull Electric Manufacturing Company (or equivalent). The entire front of the duct on each section shall consist of hinged or removable cover for ready access to the interior. The cross-section of the duct shall be not less than 4 4 inch (100 100 mm) except where otherwise shown in the plans.

109-3.14 Ground rods. Ground rods shall be in accordance with Item L-108.

109-3.15 Vault prefabricated metal housing. The prefabricated metal housing shall be a commercially available unit.

109-3.16 FAA-approved equipment. Certain items of airport lighting equipment installed in vaults are covered by individual ACs listed below:

AC 150/5345-3 Specification for L-821, Panels for Remote Control of Airport Lighting

AC 150/5345-5 Circuit Selector Switch

AC 150/5345-7 Specification for L-824 Underground Electrical Cable for Airport Lighting Circuits

AC 150/5345-10 Specification for Constant Current Regulators and Regulator Monitors

AC 150/5345-13 Specification for L-841 Auxiliary Relay Cabinet Assembly for Pilot Control of Airport Lighting Circuits.

AC 150/5345-49 Specification for L-854, Radio Control Equipment

AC 150/5345-56 Specification for L-890 Airport Lighting Control and Monitoring System

(ALCMS)

109-3.17 Other electrical equipment. Distribution transformers, oil switches, cCutouts, relays, terminal blocks, transfer relays, circuit breakers, and all other regularly used commercial items of electrical equipment not covered by FAA equipment specifications and ACs shall conform to the applicable rulings and standards of the Institute of Electrical and Electronic Engineers (IEEE) or the National Electrical Manufacturers Association (NEMA). When specified, test reports from a testing laboratory indicating that the equipment meets the specifications shall be supplied. In all cases, equipment shall be new and a first-grade product. This equipment shall be supplied in the quantities required for the specific project and shall incorporate the electrical and mechanical characteristics specified in the proposal and plans.

Equipment selected and installed by the Contractor shall maintain the interrupting current rating of the existing systems or specified rating whichever is greater.

109-3.18 Wire. Wire (in conduit) rated up to 5,000 volts shall be per AC 150/5345-7, Specification for L-824 Underground Electrical Cables for Airport Lighting Circuits. For ratings up to 600 volts, moisture and heat resistant thermoplastic wire conforming to Commercial Item Description A-A-59544A Type THWN-2 shall be used. The wires shall be of the type, size, number of conductors, and voltage shown in the plans or in the proposal.

Item L-109 Airport Transformer Vault and Vault Equipment 4

a. Control circuits. Unless otherwise indicated on the plans, wire shall be not less than No. 12 American wire gauge (AWG) and shall be insulated for 600 volts. If telephone control cable is specified, No. 19 AWG telephone cable per ANSI/Insulated Cable Engineers Association (ICEA) S-85-625 specifications shall be used.

b. Power circuits.

(1) 600 volts maximum – Wire shall be No. 6 AWG or larger and insulated for at least 600 volts.

(2) 3,000 volts maximum – Wire shall be No. 6 AWG or larger and insulated for at least 3,000 volts.

(3) Over 3,000 volts-Wire shall be No. 8 6 AWG or larger and insulated for at least the circuit voltage.

109-3.19 Short circuit / coordination / device evaluation / arc flash analysis. The Contractor shall, based upon the equipment provided, include as a part of the submittal process the electrical system “Short Circuit / Coordination / Device evaluation / Arc Flash Analysis”. The analysis shall be performed by the equipment manufacturer and submitted in a written report. The analysis shall be signed and sealed by a registered professional Engineer from the state in which the project is located. The analysis shall comply with NFPA-70E and IEEE 1584.

The analysis will include: one line diagrams, short circuit analysis, coordination analysis, equipment evaluation, arc flash analysis and arc flash labels containing at a minimum, equipment name, voltage/current rating, available incident energy and flash protection boundary.

The selected firms field service Engineer shall perform data gathering for analysis completion and device settings, perform device setting as recommended by the analysis and will furnish and install the arc flash labels. The components worst case incident energy will be considered the available arc flash energy at that specific point in the system. Submit three written copies and one electronic copy of the report.

CONSTRUCTION METHODS

CONSTRUCTION OF VAULT AND PREFABRICATED METAL HOUSING

109-4.1 General. The Contractor shall install a new precast concrete vault construct the transformer vault or prefabricated metal housing at the location indicated in the plans. Vault construction shall be reinforced concrete, concrete masonry, or brick wall as specified. The metal housing shall be prefabricated equipment enclosure to be supplied in the size specified. The mounting pad or floor details, installation methods, and equipment placement are shown in the plans. Precast concrete structures shall be furnished by a plant meeting National Precast Concrete Association Plant Certification Program or another engineer approved third party certification program.

The Contractor shall clear, grade, and seed the area around the vault or metal housing for a minimum distance of 10 feet (3 m) on all sides. The slope shall be not less than 1/2 inch per foot (12 mm per 0.3 m) away from the vault or metal housing in all directions.

The vault shall provide adequate protection against weather elements, including rain, wind-driven dust, snow, ice and excessive heat. The vault shall have sufficient filtered ventilation, to assure that the interior room temperatures and conditions do not exceed the recommended limits of the electrical equipment to be installed in the vault. The Contractor is responsible for contacting the manufacturer of the equipment to be installed to obtain environmental limitations of the equipment to be installed. Refer to the electrical vault detail plan sheets for construction requirements. The prefabricated building shall include roof, walls and floor in accordance with the details and these specifications.

Item L-109 Airport Transformer Vault and Vault Equipment 5

109-4.2 Foundation and walls.

a. Reinforced concrete construction. The Contractor shall construct the foundation and walls per the details shown in the plans. Unless otherwise specified, internal ties shall be of the mechanical type so that when the forms are removed the ends of the ties shall be at least one inch (25 mm) beneath the concrete surface; the holes shall be plugged and finished to prevent discoloration. Reinforcing steel shall be placed, as shown in the drawings, and secured in position to prevent displacement during the concrete placement.

The external surfaces of the concrete shall be thoroughly worked during the placing operation to force all coarse aggregate from the surface. Thoroughly work the mortar against the forms to produce a smooth finish free from air pockets and honeycomb.

The surface film of all pointed surfaces shall be removed before setting occurs. As soon as the pointing has set sufficiently, the entire surface inside and outside of the vault shall be thoroughly wet with water and rubbed with a No. 16 carborundum stone, or equivalent quality abrasive, bringing the surface to a paste. All form marks and projections shall be removed. The surface produced shall be smooth and dense without pits or irregularities. The materials which have been ground into a paste during the rubbing process shall be spread or brushed uniformly over the entire surface (except the interior surfaces that are to be painted shall have all paste removed by washing before painting) and permitted to reset. Final exterior finish shall be obtained by rubbing with No. 30 carborundum stone, or an equivalent quality abrasive. The surface shall be rubbed until the entire surface is smooth and uniform in color.

b. Brick and concrete construction. When this type of construction is specified, the foundation shall be concrete conforming to the details shown in the plans. The outer edge of the foundation at the floor level shall be beveled 1-1/2 inches (38 mm) at 45 degrees. Brick walls shall be 8 inches (200 mm) thick, laid in running bond with every sixth course a header course. Brick shall be laid in cement mortar (one part masonry cement and 3 parts sand) with full mortar bed and shoved joints. All joints shall be completely filled with mortar, and facing brick shall be back-parged with mortar as work progresses. All joints shall be 3/8 inch (9 mm) thick, exterior joints tooled concave, and interior joints struck flush. Both interior and exterior brick surfaces shall be cleaned and nail holes, cracks and other defects filled with mortar. When specified, a nonfading mineral pigment mortar coloring shall be added to the mortar. Steel reinforcing bars, 3/8 inch (9 mm) in diameter and 12 inches (300 mm) long, shall be set vertically in the center of the brick wall on not more than 2 feet (60 cm) centers to project 2-1/2 inches (60 mm) into the concrete roof slab. Lintels for supporting the brickwork over doors, windows, and louvers shall consist of two 4 3 3/8 inch (100 75 9 mm) steel angles. Lintels shall be painted with one coat of corrosion-inhibiting primer before installation, and all exposed parts shall be painted similar to doors and window sash after installation.

Window sills may be concrete poured in place or precast concrete as indicated in the plans. All exposed surfaces shall have a rubbed finish as specified under reinforced concrete construction. After completion, all interior and exterior faces of walls shall be scrubbed with a solution of muriatic acid and water in the proportions of not less than one part acid to 10 parts of water. All traces of efflorescence, loose mortar, and mortar stain shall be removed, and the walls washed down with clear water.

c. Concrete masonry construction. When this type of construction is specified, the foundation shall be concrete conforming to the details shown in the plans. The concrete masonry units shall be standard sizes and shapes and shall conform to ASTM C90 and shall include the closures, jambs, and other shapes required by the construction as shown in the plans. Standard construction practice shall be followed for this type of work including mortar, joints, reinforcing steel for extensions into roof slab, etc. Plaster for interior walls, if specified, shall be Portland cement plaster.

109-4.3 Roof. The roof shall be reinforced concrete as shown in the plans. Reinforcing steel shall be placed as shown in the drawing and secured in position to prevent displacement during the pouring of the concrete. The concrete shall be poured monolithically and shall be free of honeycombs and voids. The

Item L-109 Airport Transformer Vault and Vault Equipment 6 surface shall have a steel-troweled finish and shall be sloped as shown in the drawing. The underside of the roof slab shall be finished in the same manner as specified for walls.

One brush or mop coat of hot asphalt roof coating shall be applied to the top surface of the roof slab. The asphalt material shall be heated to within the range specified by the manufacturer and immediately applied to the roof. The finished coat shall be continuous over the roof surface and free from holidays and blisters. Smears and dribbles of asphalt on the roof edges and building walls shall be removed.

109-4.4 Floor. Construct building foundation in accordance with the details shown in the plans. The floor shall be reinforced concrete as shown in the drawings. When present, all sod, roots, refuse, and other perishable material shall be removed from the area under the floor to a depth of 8 inches (200 mm), unless a greater depth is specified in the invitation for bids. This area shall be backfilled with materials consisting of sand, cinders, gravel, or stone. Fill shall be placed in layers not to exceed 4 inches (100 mm) and shall be thoroughly compacted by tamping or rolling. A layer of building paper shall be placed over the fill prior to placing concrete. The floor surfaces shall have a steel-troweled finish. The floor shall be level unless a drain is specified, in which case the floor shall be pitched 1/4 inch (6 mm) per foot downward toward the drain. A 1/4-inch (6-mm) asphalt felt expansion joint shall be placed between floor and foundation walls. The floor shall be poured monolithically and shall be free of honeycombs and voids.

109-4.5 Floor drain. If shown in the plans, a floor drain and dry well shall be installed in the center of the floor of the equipment room. The dry well shall be excavated 4 × 4 feet (1.2 × 1.2 m) square and to a depth of 4 feet (1.2 m) below the finished floor elevation and shall be backfilled to the elevation of the underside of the floor with gravel - which shall all pass a 2-inch (50 mm) mesh sieve and shall all be retained on a 1/4-inch (6.3 mm) mesh sieve. The gravel backfill shall be placed in 6 inch (150 mm) maximum layers, and the entire surface of each layer shall be tamped either with a mechanical tamper or with a hand tamper weighing not less than 25 pounds (11 kg) and having a face area of not more than 36 square inches (232 square cm) nor less than 16 square inches (103 square cm). The drain inlet shall be set flush in the concrete floor. The drain shall have a clear opening of not less than 8 inches (200 mm) in diameter.

109-4.6 Conduits in floor and foundation. Conduits shall be installed in the floor and through the foundation walls per the details shown in the plans. All underground conduit shall be painted with an asphalt compound. Conduit shall be installed with a coupling or metal conduit adapter flush with the top of the floor. All incoming conduit shall be closed with a pipe plug to prevent the entrance of foreign material during construction. Space conduit entrances shall be left closed.

109-4.7 Doors. Doors shall be metal-clad fireproof Class A (three (3) hour rated) doors conforming to requirements of the National Electrical Code (NEC) and local electrical codes. Panic bar exit hardware shall be installed per NEC requirements. Refer to the new electrical vault detail plan sheets for construction requirements.

109-4.8 Painting. The floor, ceiling, and inside walls of concrete construction shall first be given a hardening treatment, after which the Contractor shall apply two coats of paint as specified below, except that interior face brick walls need not be painted. The hardening treatment shall consist of applying two coats of either a commercial floor hardener or a solution made by dissolving 2 pounds (0.9 kg) of magnesium fluorosilicate or zinc sulfate crystals in one gallon (liter) of water. Each coat shall be allowed to dry at least 48 hours before the next application. After the second treating coat has dried, the surfaces shall be brushed clean of all crystals and thoroughly washed with clear water. Paint for walls and ceiling shall be a light gray color approved by the RPR. The floor paint shall be a medium gray color approved by the RPR. Before painting, the surfaces shall be dry and clean. The first coat shall be thinned by adding 2/3-quart (0.63 liters) of spar varnish and 1/3-quart (0.31 liters) of turpentine to each gallon (liter) of paint. The second coat shall be applied without thinning. All doors, lintels, and windows shall be cleaned to remove any rust or foreign material and shall be given one body and one finish coat of white paint.

Item L-109 Airport Transformer Vault and Vault Equipment 7

Bare metal surfaces shall be given a prime coat of corrosion-inhibiting primer prior to the body and finish coats.

109-4.9 Lights and switches. Provide lights and switches within the vault room as indicated in the plans. The Contractor shall furnish and install a minimum of two duplex convenience outlets in the vault room. Where a control room is specified, at least two duplex outlets shall be installed.

INSTALLATION OF EQUIPMENT IN VAULT OR PREFABRICATED METAL HOUSING

109-5.1 General. The Contractor shall furnish, install, and connect all equipment, equipment accessories, conduit, cables, wires, buses, grounds, and support necessary to ensure a complete and operable electrical distribution center for the airport lighting system as specified herein and shown in the plans. When specified, an emergency power supply and transfer switch shall be provided and installed.

The equipment installation and mounting shall comply with the requirements of the National Electrical Code and local code agency having jurisdiction. All electrical work shall comply with the NEC and local code agency having jurisdiction including the separation of under 600V work from 5,000V work.”

109-5.2 Power supply equipment. Transformers, rRegulators, booster transformers, and other power supply equipment items shall be furnished and installed at the location shown in the plans or as directed by the Engineer. The power supply equipment shall be set on steel “H” sections, “I” beams, channels, or concrete blocks to provide a minimum space of 1-1/2 inch (38 mm) between the equipment and the floor.

The equipment shall be placed so as not to obstruct the oil-sampling plugs of the oil-filled units; and name-plates shall, so far as possible, not be obscured.

If specified in the plans and specifications, equipment for an alternate power source or an emergency power generator shall be furnished and installed. The alternate power supply installation shall include all equipment, accessories, an automatic changeover switch, and all necessary wiring and connections. The emergency power generator set shall be the size and type specified.

109-5.3 Switchgear and panels. Oil switches, fused cutouts, relays, transfer switches, panels, panel boards, and other similar items shall be furnished and installed at the location shown in the plans or as directed by the Engineer. Wall or ceiling mounted items shall be attached to the wall or ceiling with galvanized bolts of not less than 3/8-inch (9 mm) diameter engaging metal expansion shields or anchors in masonry or concrete vaults.

109-5.4 Duct and conduit. The Contractor shall furnish and install square-type exposed metallic ducts with hinged covers for the control circuits in the vault. These shall be mounted along the walls behind all floor-mounted equipment and immediately below all wall-mounted equipment. The hinged covers shall be placed to open from the front side with the hinges at the front bottom.

Wall brackets for square ducts shall be installed at all joints 2 feet (60 cm) or more apart with intermediate brackets as specified. Conduit shall be used between square ducts and equipment or between different items of equipment when the equipment is designed for conduit connection. When the equipment is not designed for conduit connection, conductors shall enter the square-type control duct through insulating bushings in the duct or on the conduit risers.

109-5.5 Wiring and connections. The Contractor shall make all necessary electrical connections in the vault per the wiring diagrams furnished and as directed by the Engineer. In wiring to the terminal blocks, the Contractor shall leave sufficient extra length on each control lead to make future changes in connections at the terminal block. This shall be accomplished by running each control lead the longest way around the box to the proper terminal. Leads shall be neatly laced in place.

109-5.6 Marking and labeling. All equipment, control wires, terminal blocks, etc., shall be tagged, marked, or labeled as specified below:

Item L-109 Airport Transformer Vault and Vault Equipment 8

a. Wire identification. The Contractor shall furnish and install self-sticking wire labels or identifying tags on all control wires at the point where they connect to the control equipment or to the terminal blocks. Wire labels, if used, shall be of the self-sticking preprinted type and of the manufacturer’s recommended size for the wire involved. Identification -markings designated in the plans shall be followed. Tags, if used, shall be of fiber not less than 3/4 inch (19 mm) in diameter and not less than 1/32 inch (1 mm) thick. Identification markings designated in the plans shall be stamped on tags by means of small tool dies. Each tag shall be securely tied to the proper wire by a nonmetallic cord.

b. Labels. The Contractor shall stencil identifying labels on the cases of regulators, breakers, and distribution and control relay cases with white oil paint as designated by the Engineer. The letters and numerals shall be not less than one inch (25 mm) in height and shall be of proportionate width. The Contractor shall also mark the correct circuit designations per the wiring diagram on the terminal marking strips, which are a part of each terminal block.

METHOD OF MEASUREMENT

109-6.1 The quantity of vaults to be paid for under this item shall consist of the number of vaults constructed in place and accepted as a complete unit.

109-6.2 The quantity of prefabricated metal housings to be paid for under this item shall consist of the number of housings constructed in place and accepted as a complete unit.

109-6.3 The quantity of vault equipment to be paid for under this item shall consist of all equipment installed, connected and accepted as a complete unit ready for operation within an existing vault or prefabricated metal housing.

BASIS OF PAYMENT

109-7.1 Payment will be made at the contract unit price for each completed and accepted vault or prefabricated metal housing equipment installation. This price shall be full compensation for furnishing all materials and for all preparation, assembly, and installation of these materials, and for all labor, equipment, tools, and incidentals necessary to complete the item.

Payment will be made under:

Item L-109-7.1 Furnish and Install Precast Concrete Electrical Vault on Concrete Foundation; Furnish and Install New Electrical Equipment and Place into Service All New Airfield Lighting Systems - per lump sum.

Item L-109-7.2 Provide and Install 2.5kW 3-Step Ferroresonant L-828 CCR for MIRL Circuit - per lump sum.

Item L-109 Airport Transformer Vault and Vault Equipment 9

REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

Advisory Circulars (AC)

AC 150/5340-30 Design and Installation Details for Airport Visual Aids

AC 150/5345-3 Specification for L-821, Panels for Remote Control of Airport Lighting

AC 150/5345-5 Circuit Selector Switch

AC 150/5345-7 Specification for L-824 Underground Electrical Cable for Airport Lighting Circuits

AC 150/5345-10 Specification for Constant Current Regulators and Regulator Monitors

AC 150/5345-13 Specification for L-841 Auxiliary Relay Cabinet Assembly for Pilot Control of Airport Lighting Circuits

AC 150/5345-49 Specification L-854, Radio Control Equipment;

AC 150/5345-53 Airport Lighting Equipment Certification Program

American National Standards Institute / Insulated Cable Engineers Association (ANSI/ICEA)

ANSI/ICEA S-85-625 Standard for Telecommunications Cable Aircore, Polyolefin Insulated, Copper Conductor Technical Requirements

ASTM International (ASTM)

ASTM A615 Standard Specification for Deformed and Plain Carbon-Steel Bars for Concrete Reinforcement

ASTM C62 Standard Specification for Building Brick (Solid Masonry Units Made from Clay or Shale)

ASTM C90 Standard Specification for Loadbearing Concrete Masonry Units

ASTM D2823 Standard Specification for Asphalt Roof Coatings, Asbestos Containing

ASTM D4479 Standard Specification for Asphalt Roof Coatings – Asbestos-Free

Commercial Item Description (CID)

A-A 59544 Cable and Wire, Electrical (Power, Fixed Installation) Institute of Electrical and Electronic Engineers (IEEE)

IEEE 1584 Guide for Performing Arc-Flash Hazard Calculations

Master Painter’s Institute (MPI)

MPI Reference #9 Alkyd, Exterior, Gloss (MPI Gloss Level 6)

Underwriters Laboratories (UL)

UL Standard 6 Electrical Rigid Metal Conduit – Steel

UL Standard 514B Conduit, Tubing, and Cable Fittings

UL Standard 514C Nonmetallic Outlet Boxes, Flush-Device Boxes, and Covers

UL Standard 651 Schedule 40, 80, Type EB and A Rigid PVC Conduit and Fittings

UL Standard 651A Type EB and A Rigid PVC Conduit and HDPE Conduit

Item L-109 Airport Transformer Vault and Vault Equipment 10

National Fire Protection Association (NFPA)

NFPA-70 National Electrical Code (NEC)

NFPA-70E Standard for Electrical Safety in the Workplace

NFPA-780 Standard for the Installation of Lightning Protection Systems

END OF ITEM L-109

SS-300 - 1

Automatic Transfer Switch

(Addendum No. 1)

ITEM SS-300 AUTOMATIC TRANSFER SWITCH

(Non-Standard FAA Specification)

DESCRIPTION

300-1.1 This item shall consist of furnishing and installing an automatic transfer switch per these specifications and per the design and detail shown in the plans. This shall be included as a part of the new precast concrete vault.

The work shall include the furnishing and installation of a support for the automatic transfer switch and the specified interconnecting wire. The item shall also include all cable connections, conduit and conduit fittings, the testing of the installation, and all incidentals necessary to place the automatic transfer switch in operation (as a completed unit) to the satisfaction of the Engineer.

EQUIPMENT AND MATERIALS

300-2.1 GENERAL.

a. All equipment and materials covered by referenced specifications shall be subject to acceptance through manufacturer’s certification of compliance with the applicable specification when requested by the Engineer.

b. Manufacturer’s certifications shall not relieve the Contractor of the responsibility to provide materials per these specifications. Materials supplied and/or installed that do not comply with these specifications shall be removed (when directed by the Engineer) and replaced with materials that comply with these specifications, at the Contractor’s cost.

c. All materials and equipment used to construct this item shall be submitted to the Engineer for approval prior to ordering the equipment. Submittals consisting of marked catalog sheets or shop drawings shall be provided. Submittal data shall be presented in a clear, precise and thorough manner.

Original catalog sheets are preferred. Photocopies are acceptable provided they are as good a quality as the original. Clearly and boldly mark each copy to identify products or models applicable to this project.

Indicate all optional equipment and delete any non-pertinent data. Submittals for components of electrical equipment and systems shall identify the equipment to which they apply on each submittal sheet.

Markings shall be made bold and clear with arrows or circles (highlighting is not acceptable). Contractor is solely responsible for delays in the project that may accrue directly or indirectly from late submissions or resubmissions of submittals.

d. The data submitted shall be sufficient, in the opinion of the Engineer, to determine compliance with the plans and specifications. The Contractor’s submittals shall be in electronic pdf format, tabbed by specification section. The Engineer reserves the right to reject any and all equipment, materials or procedures, that do not meet the system design and the standards and codes, specified in this document.

e. All equipment and materials furnished and installed under this section shall be guaranteed against defects in materials and workmanship for at least twelve (12) months from the date of final

SS-300 - 2

Automatic Transfer Switch

(Addendum No. 1) acceptance by the Owner. The defective materials and/or equipment shall be repaired or replaced, at the Owner’s discretion, with no additional cost to the Owner.

300-2.2 MANUFACTURER. The automatic transfer switch shall be as manufactured by Cummins Power Generation X-Series, Kohler KEP, ASCO 7000, amps as indicated on the drawings, or equal.

a. Interlocked molded case circuit breakers or contactors are not acceptable.

b. The transfer switch shall be capable of switching all classes of load and shall be rated for continuous duty when installed in a nonventilated enclosure constructed in accordance with Underwriters Laboratories, Inc., UL 1008. The transfer switch shall be provided with a NEMA 1 enclosure.

300-2.3 CONSTRUCTION AND PERFORMANCE.

a. The transfer switch shall be double-throw, actuated by a single electrical operator momentarily energized and connected to the transfer mechanism by a simple overcenter linkage, with a minimum transfer time of 400 milliseconds.

b. The transfer switch shall have the ability to detect under and over-voltage, under and over-frequency, voltage imbalance, incorrect phase rotation, and phase loss.

c. The time delay between the opening of the closed contacts and the closing of the open contacts shall allow for voltage decay before transfer.

d. The transfer switch shall allow the motor and transformer loads to be reenergized after transfer with normal inrush current. The transfer switch shall be capable of transferring successfully in either direction with 70% of rated voltage applied to the switch terminals.

e. The normal and emergency contacts shall be positively interlocked mechanically and electrically to prevent simultaneous closing. Main contacts shall be mechanically locked in position in both the normal and standby positions without the use of hooks, latches, magnets, or springs and shall be silver tungsten alloy. All contacts shall be 100% rated. Separate arcing contacts with magnetic blowouts shall be provided on all transfer switches.

f. The transfer switch shall be equipped with a safe manual operator designed to prevent injury to operating personnel. The manual operator shall provide the same transfer speed as the electrical operator to prevent a flashover from switching the main contacts slowly.

g. The transfer switch shall be equipped with a digital display that has the ability to monitor load power conditions, network status, review transfer switch events, and adjust transfer switch parameters.

The display shall also include a bar graph display that indicates the level of power being supplied to the load as well as three-phase voltage, current, frequency, power factor, and kilowatts.

300-2.4 SEQUENCE OF OPERATION.

a. Engine starting contacts shall be provided to start the future generating plant should the voltage of the normal source drop below 80% on any phase after an adjustable time delay to allow for momentary dips. The transfer switch shall transfer to standby when 90% of rated voltage and frequency has been reached. After restoration of normal power on all phases to 90% of rated voltage, an adjustable time delay period of zero to 31 minutes shall delay retransfer to allow stabilization of normal power. If the standby

SS-300 - 3

Automatic Transfer Switch

(Addendum No. 1) power source should fail during this time delay period, the switch shall automatically return to the normal source.