18-00373_Statement_of_Work.docx

Statement of Work Object:

The contractor shall remove an existing 200 ft. ROHN 55G tower and 8 bay NWR antenna, coaxial cable and hardware mounted on the tower and replace it with a new 190 ft. ROHN 55G tower (Brand name or equal). Install one 4 bay antenna, 7/8” coaxial cable and all associated hardware and bridge cable (support cable between transmitter building and tower) needed to support antenna coaxial cable installation to transmitter in building approximately 50 ft. from tower base. Install a 3/8 safety climb cable system. Tower and guy wires shall be properly grounded in accordance with National Weather Service Manual 30-4106, lightning protection, grounding, bonding, and shielding and surge protection (http://www.nws.noaa.gov/directives/sym/pd03041006curr.pdf) and shall achieve a 5 ohms or less reading on new tower grounds. The Service Contract Labor Standards act applies for Bay County, FL.

Location:

National Marine Fisheries Services 3500 Delwood Beach Road Panama City, FL 32408-7403

30-08-49.6 N 085-42-45.7 W

Period of Performance:

All work shall be completed within 90 days of contract award.

General Information:

Federal Point of Contact-

Sam Perry National Weather Service RMS Phone: (813) 645-2323 x 270 Cell: 210-867-5310 Email: sam.perry@noaa.gov

National Weather Service shall provide the following as Government Furnished Equipment

1. All parts necessary to fabricate an 4-bay SCALA antenna

2. Two 3 ft. stand offs to mount antenna to tower.

3. 250 ft. spool of 7/8” coax cable

4. Connectors for 7/8” coax cable

5. Mastic and Electrical tape for weatherproofing connectors

6. All coax cable Grounding kits, cable hangers, round member adapters, entry port, hoisting grips – as needed to complete coax installation

Contractor shall be responsible for obtaining and paying for all permits needed and schedule any required inspections required by local area authorities needed to complete this job.

Contractor will have one person designated as lead foreman and that person shall be on site for any and all work that takes place on this project regardless if it’s the contractor or a subcontractor.

The contractor shall provide the following materials and perform all the following Labor:

Removal of old tower:

1. Remove one VHF 8-Bay SWR antenna mounted at 200 ft.

2. Remove 7/8” coax cable between antenna and transmitter building (located about 20 feet from tower)

3. Remove tower lighting system, one red beacon at 200 ft. two side lights at 100 ft. and all associated electrical wiring.

4. Remove one 200 ft. Rohn 55G guyed tower, anchors, foundations and grounds

5. Cut anchor rods below ground level and remove tower foundation

6. Remove and dispose of old tower, antenna and coaxial cable materials and debris.

Installation of new tower:

1. Provide and install a new 190 ft. Rohn 55G (brand name or equal) guyed tower, anchors and foundation.

There shall be a minimum of 6 Guy wire Anchors provided/used for this tower installation. LED tower lighting system, shall have at least one red flashing (L-864) Light installed in a manner to ensure an unobstructed view at the top of the tower by a pilot. Intermediate level lighting at 100 ft. shall have two or more flashing lights (L-810) shall be mounted outside at diagonally opposite positions. These lights should be configured to flash simultaneously with the L-864 flashing light on the top of the tower at a rate of 30 flashes per minute (FPM) (± 3 FPM) and a Safety climb cable system.

2. Provide materials and labor to install new ground ring system for new tower. Each tower leg shall be grounded in accordance with National Weather Service Manual 30-4106. Exothermic welds will be used for all connections to the earth electrode system (EES)

3. Tower shall have 2 air terminals at the top of the tower connected to two No. 4/0 AWG copper down conductors mounted on the inside of tower connected to the system ground ring.

4. Provide materials and labor to ground all guy wires at each anchor.

5. The tower, guy wires, anchors, foundations, tower lights and safety climb cable system shall be configured and installed to manufacturer’s requirements, and to survive wind loading up to 130 miles per hour. The contractor shall provide detailed installation plans as a part of their proposal demonstrating that their installation will meet the tower manufacturer’s installation requirement.

6. Contractor shall preform any required grading and grass seeding following tower installation, to restore the site to the same environmental condition that existing prior to the removal of the old tower.

Installation of new antenna:

1. Fabricate and install new 4-bay Scala antenna using 36-inch standoff mounts at a (center of radiation) height of 180 feet on the Southeast leg of the tower. (Note: Antenna is 20 ft. in length and weighs approximately 70 lbs.)

2. Install new 7/8 “coax cable between antenna (180 feet height on tower) and transmitter location which is approximately 20 feet from base of tower. Install appropriate connectors at each end of cable.

3. Perform spectrum sweep of antenna installation from 162 to 163 MHz, showing VSWR of antenna system. VSWR shall be less than 1.5:1. Provide a copy of the spectral sweep to National Weather Service personnel.

Rohn Model 55G Tower Salient Characteristics:

1. Tower design meets requirements of ANSI/TIA-222-G (structural standard for antenna supporting structures and antennas) Class 1 structures

2. Tower construction material Steel.

3. Tower design is a 17 inch (each side) equilateral triangle design.

4. High-strength tubular legs joined by zig-zag bracing cross members.

5. Cross member bracing diameter: 0.438 inches.

6. Double-bolted leg joints for strength and reliability.

7. Continuous solid-round steel bracing used throughout the tower.

8. Bracing welded directly to tower legs.

9. Entire tower structure hot-dip galvanized after fabrication.

10. Tower leg diameter: 1.5 inches.

11. Wind loading: Tower will support 130 miles per hour wind loading when guyed to manufacturer’s specifications.

12. Warranty: 12 Months.