SOW_Eddy River Forest and Sumatra Repeater Guy Tensioning.pdf

STATEMENT OF WORK (SOW)

Remediation

For

U.S. Forest Service Guy Towers

AJW-L533 / United States Forest Service

1. Introduction and Overview

This Statement of Work (SOW) will be issued in support of the United States Forest Service (USFS) mission to sustain the health, diversity, and productivity of the nation’s forests and grasslands to meet the needs of present and future generations. The initiative will focus on addressing systemic maintenance and critical infrastructure issues afflicting the USFS tower inventory and their ability to support mission critical activities. The contracting entity will serve independently to provide technical, and logistics services to support the Federal Aviation Administration (FAA) in the efforts detailed within this scope of work.

2. Scope of Work

The scope of work will encompass the implementation of guy system tensioning, minor guy system repair required for tensioning and new grounding installed on the guys and guy anchors of all identified USFS tower assets. Tensioning, minor repairs, and grounding shall be performed to meet applicable standards on each identified structure. Selected contractor(s) shall provide all necessary tools, equipment, material, and technical expertise to complete this effort:

a. System Types: Guyed lattice-based communication towers, guyed lattice-based fire watch/lookout towers, guyed lattice-based research towers.

b. Minor Repair: Correction of guy system and tower deficiencies are identified below in site specific requirements.

c. Grounding: A waterfall ground lead shall be installed on each guy wire near ground level. Each anchor shaft or fan plate shall also be bonded. The grounding leads shall be #2 tinned copper (stranded or solid). A new ground rod shall be installed in front of the anchor per applicable standards.

d. Facility Type:

Sole-Use: Stand-alone tower with communications building or box that is not attached to any other facility even if on the same land unit.

e. Site Specific Requirements:

Site – Eddy Repeater

i. Tension each guyed wire to initial tension as specified in TIA-222 Rev. H.

ii. Perform corrosion abatement and control to each guyed wire anchor.

1. Dig to block method is required to inspect guy anchor shaft for corrosion.

iii. Install safety wire at each guy anchor termination point.

iv. Install grounding at each guy anchor location as specified in TIA-222 Rev. H.

1. Ground rods shall be 5/8 in. (15.88 mm) in diameter and 10 ft (3.048 m) long.

v. Grounding resistance should meet NFPA 780’s preferred 10 ohms of resistance with 25 ohms as the accepted minimum standard. Resistance levels in excess of 25 ohms will need to be approved should soil conditions limit the achievement of referenced minimum standards.

vi. Clear soil and vegetation around the immediate area of the guy anchor and establish erosion control.

vii. Clear vegetation in guy lane immediate under guy wires no less than 10’ wide from anchor to tower.

1. (Local Forest approval required to perform work item vi & vii).

i. Install above grade ground system on tower and shelter to meet NFPA 780 and TIA-222 current addition.

Details and acceptations to above grade grounding installation.

1. Standard Conductor sizes: #2/0 AWG 133,100 Cir. Mils

2. Air terminal shall be installed no less than 6’ above the tallest antenna with an isolated lead rundown the tower and tied into the grounding system according NFPA 780. A rolling sphere design to support air terminal placement shall be provided and approved prior to installation.

3. Number of Down Conductors. At least two (2) down conductors shall be provided on any kind of structure, including steeples. NFPA 780 5.4 does not apply.

4. The target for the total ground resistance of this system is twenty-five

(25) ohms or less.

5. Ground rods shall not be less than 5/8 in. (12.7 mm) in diameter and 10 ft (2.4 m) long.

6. Ground connections shall be exothermic welds when possible or a non-reversible ground lug connection otherwise. Notable exceptions for exothermic welding, all above grade connections, tower legs, locations in dry or arid conditions with approval.

7. Ground rods that cannot be driven straight down, due to contact with rock formations, may be driven at an oblique angle of not greater than 45 degrees from the vertical or may be buried horizontally and perpendicular to the building, in a trench at least 762 mm (30 in.) deep.

8. The interconnection of the lightning protection system grounding electrodes and other grounded media shall be in the form of a ground loop conductor.

9. Each leg of a self-supporting tower shall be bonded to the tower ground ring using grounding conductors of 35 mm2 csa (#2 AWG) or coarser, bare, solid, tinned, copper conductor. Connection method shall be manufacturer or engineer approved.

10. The tower ground bus bar shall be connected to the tower grounding electrode system with a 35 mm csa (#2 AWG) or coarser, bare, solid, tinned, copper conductor.

11. Provide As-Built drawings of ground system.

viii. Secure waveguide/cable to tower at (3) ft. intervals where not currently attached with appropriate hangers.

ix. Remove loose hardware that has been abandoned at 115 and 177 feet.

x. Replace missing nuts on safety climb system.

xi. Perform tower mapping on structure.

Site – River Forest Repeater

ii. Perform corrosion abatement and control to each guyed wire anchor.

1. Dig to block method is required to inspect guy anchor shaft for corrosion.

iii. Install safety wire at each guy anchor termination point.

iv. Install grounding at each guy anchor location as specified in TIA-222 Rev. H.

1. Ground rods shall be 5/8 in. (15.88 mm) in diameter and 10 ft (3.048 m) long.

v. Grounding resistance should meet NFPA 780’s preferred 10 ohms of resistance with 25 ohms as the accepted minimum standard. Resistance levels in excess of 25 ohms will need to be approved should soil conditions limit the achievement of referenced minimum standards.

vi. Clear soil and vegetation around the immediate area of the guy anchor and establish erosion control.

vii. Clear vegetation in guy lane immediate under guy wires no less than 10’ wide from anchor to tower.

1. (Local Forest approval required to perform work item vi & vii).

ii. Install above grade ground system on tower and shelter to meet NFPA 780 and

TIA-222 current addition.

Details and acceptations to above grade grounding installation.

1. Standard Conductor sizes: #2/0 AWG 133,100 Cir. Mils

2. Air terminal shall be installed no less than 6’ above the tallest antenna with an isolated lead rundown the tower and tied into the grounding system according NFPA 780. A rolling sphere design to support air terminal placement shall be provided and approved prior to installation.

3. Number of Down Conductors. At least two (2) down conductors shall be provided on any kind of structure, including steeples. NFPA 780 5.4 does not apply.

4. The target for the total ground resistance of this system is twenty-five

(25) ohms or less.

5. Ground rods shall not be less than 5/8 in. (12.7 mm) in diameter and 10 ft (2.4 m) long.

6. Ground connections shall be exothermic welds when possible or a non-reversible ground lug connection otherwise. Notable exceptions for exothermic welding, all above grade connections, tower legs, locations in dry or arid conditions with approval.

7. Ground rods that cannot be driven straight down, due to contact with rock formations, may be driven at an oblique angle of not greater than 45 degrees from the vertical or may be buried horizontally and perpendicular to the building, in a trench at least 762 mm (30 in.) deep.

8. The interconnection of the lightning protection system grounding electrodes and other grounded media shall be in the form of a ground loop conductor.

9. Each leg of a self-supporting tower shall be bonded to the tower ground ring using grounding conductors of 35 mm2 csa (#2 AWG) or coarser, bare, solid, tinned, copper conductor. Connection method shall be manufacturer or engineer approved.

10. The tower ground bus bar shall be connected to the tower grounding electrode system with a 35 mm csa (#2 AWG) or coarser, bare, solid, tinned, copper conductor.

11. Provide As-Built drawings of ground system.

viii. Secure waveguide/cable to tower at (3) ft. intervals where not currently attached with appropriate hangers.

ix. Remove abandoned transmission lines on the tower (0 to 65) feet.

x. Perform tower mapping on structure.

Site –Sumatra Repeater

ii. Perform corrosion abatement and control to each guyed wire anchor.

1. Dig to block method is required to inspect guy anchor shaft for corrosion.

iii. Install safety wire at each guy anchor termination point.

iv. Install grounding at each guy anchor location as specified in TIA-222 Rev. H.

1. Ground rods shall be 5/8 in. (15.88 mm) in diameter and 10 ft (3.048 m) long.

v. Grounding resistance should meet NFPA 780’s preferred 10 ohms of resistance with 25 ohms as the accepted minimum standard. Resistance levels in excess of 25 ohms will need to be approved should soil conditions limit the achievement of referenced minimum standards.

vi. Clear soil and vegetation around the immediate area of the guy anchor and establish erosion control.

vii. Clear vegetation in guy lane immediate under guy wires no less than 10’ wide from anchor to tower.

1. (Local Forest approval required to perform work item vi & vii).

viii. Perform corrosion abatement and control on all visually identifiable spots of corrosion throughout the guy anchor system.

1. Iron, steel, or aluminum surfaces to be coated shall be clean; i.e. devoid of grease, oil, mill scale, oxidation, loosely adherent rust, paint, etc. to SSPC (Steel Structure Painting Council).

2. Grease and Oils - Solvent clean to SSPC-SP1.

3. Rust scale or easy to remove paint - Power tool and hand tool clean to

SSPC-SP3.

i. The coating shall be applied at sufficient wet film thickness to achieve a minimum dry film build of 2.5 - 3.5 mils, using manufacturer's recoat time directions.

iii. Install above grade ground system on tower, shelter, and ancillary equipment to meet NFPA 780 and TIA-222 current addition.

Details and acceptations to above grade grounding installation.

1. Standard Conductor sizes: #2/0 AWG 133,100 Cir. Mils

2. Air terminal shall be installed no less than 6’ above the tallest antenna with an isolated lead rundown the tower and tied into the grounding system according NFPA 780. A rolling sphere design to support air terminal placement shall be provided and approved prior to installation.

3. Number of Down Conductors. At least two (2) down conductors shall be provided on any kind of structure, including steeples. NFPA 780 5.4 does not apply.

4. The target for the total ground resistance of this system is twenty-five

(25) ohms or less.

5. Ground rods shall not be less than 5/8 in. (12.7 mm) in diameter and 10 ft (2.4 m) long.

6. Ground connections shall be exothermic welds when possible or a non-reversible ground lug connection otherwise. Notable exceptions for exothermic welding, all above grade connections, tower legs, locations in dry or arid conditions with approval.

7. Ground rods that cannot be driven straight down, due to contact with rock formations, may be driven at an oblique angle of not greater than 45 degrees from the vertical or may be buried horizontally and perpendicular to the building, in a trench at least 762 mm (30 in.) deep.

8. The interconnection of the lightning protection system grounding electrodes and other grounded media shall be in the form of a ground loop conductor.

9. Each leg of a self-supporting tower shall be bonded to the tower ground ring using grounding conductors of 35 mm2 csa (#2 AWG) or coarser, bare, solid, tinned, copper conductor. Connection method shall be manufacturer or engineer approved.

10. The tower ground bus bar shall be connected to the tower grounding electrode system with a 35 mm csa (#2 AWG) or coarser, bare, solid, tinned, copper conductor.

11. Bond LP tank to the EES.

12. Provide As-Built drawings of ground system.

ii. Secure waveguide/cable to tower at (3) ft. intervals where not currently attached with appropriate hangers.

iii. Replace saddle clamps with appropriate hardware.

iv. Replace corroded rail safety climb system.

v. Relocate or reconfigure equipment mounts (290 and 300) feet to create an unobstructed path for the climbing safety system.

vi. Perform tower mapping on structure.

2.1. Location of Work

a. Guyed tensioning and minor repair work will be conducted at USFS field sites and offices by the selected contractor(s).

b. Preparation and planning of activities can be accomplished at the contractor’s home office, and USFS field offices (field office management approval required).

c. Field Work Locations.

Region Forest Forest Name

Site Name Site Latitude

Site Longitude

08 05

NATIONAL

FORESTS IN FL Eddy Repeater 30°32'32.1"N 82°20'36.5"W

08 05 NATIONAL

FORESTS IN FL

River Forest Repeater

29°00'48.0"N 81°23'28.1"W

08 05 NATIONAL

FORESTS IN FL

Sumatra Repeater 30°01'52.3"N 84°59'27.4"W

2.2. Schedule

The Contractor is required to submit a preliminary schedule 10 days after award for the project executed under this SOW for Government approval and submit a final schedule two (2) weeks prior to start of work. This project shall be completed within 30 days of receiving Notice to Proceed.

Contract Award Post Award Conference Deployment Readiness Review

Mobilization Field Work Start Testing Field Work Finish Clean-up, Site Restoration

2.3. Site Access

The Contractor shall provide a schedule for staging of equipment and materials, and installation. Site access will be made available to the Contractor by FAA and the USFS. For all site visits the contractors shall provide the assigned USFS radio technician with the date, time, and meeting place for the site visit. The assigned USFS radio technician can advise the contractor what types of vehicles may be necessary for traversing the area. All questions regarding scope shall be sent to the primary and/or secondary contacts. Local USFS POC’s do not have the authority to change the SOW or make decisions that incur cost or added contract time.

a. When site POC’s are not provided, the contractor can defer to the Primary USFS POC for a site contact to be provided.

b. When contacting any contact provided via e-mail the contractor should include all primary and secondary contacts.

3. Government Equipment Security

a. Physical Security: The contractor shall be responsible for safeguarding all government property provided for contractor use. At the close of each work period, government facilities, equipment, and materials shall be secured.

b. Key Control: The Contractor shall establish and implement methods of making sure all keys/key cards issued to the Contractor by the Government are not lost or misplaced and are not used by unauthorized persons.

4. Applicable Standards

a. OSHA (1910 and 1926)

i. Contractor shall follow all applicable standards, health, and safety practices.

b. ANSI-TIA 222 Rev. H

i. 7.6.1 Initial Tension. The initial tension in guys, for design purposes, at an ambient temperature of 60o F [16o C] shall be within upper and lower limits of 15 and 7 percent, respectively, of the manufacturer’s rated breaking strength of the strand. Values of initial tension beyond these limits may be used provided consideration is given to the sensitivity of the structure to variations in initial tension. The design ambient temperature may be adjusted based on site-specific data.

ii. 13.3.2 Guy Tensions. The maximum deviation from the design initial tension shall be ± 10% for guys up to and including 1 in. [25 mm] diameter and ± 5% for guys greater than 1 in. [25 mm] diameter, of the specified design initial tension at an anchorage, corrected for the ambient temperature.

Statement of Work Power Installation

iii. 7.4.6.1 Turnbuckies. Turnbuckles used to connect guy assemblies, shall be forged from AISI grade 1030, 1035 or 1045 steel or equivalent, and suitably heat-treated (quenched and tempered, normalized or annealed).

iv. 10.4 Electrical Resistance & 10.5 Grounding Materials 10.5 Grounding Materials

c. NFPA 780

d. Obstruction Evaluation / Airport Airspace Analysis (OE/AAA)

5. Deliverables and Schedule of Delivery

a) Remediation plan shall be submitted with final schedule two (2) weeks prior to start of work.

b) Documents shall include a report of completed on sites activities, test data for tensioning before and after tensioning.

c) Schedule of prework and on-site activities is to be provided by the Contractor and accepted by the Primary Project POC.

d) Pictures shall be taken of all below grade work before, during and after excavation.

e) Post site completion all field reporting, images, SA, and data packages are to be delivered to the Primary Project POC within 30 days.

f) Any final delivery of project documents shall be submitted in PDF format.

6. Completion Criteria

a. All required project documents have been provided to USFS and FAA and have been formally accepted.

b. All specified requirements have been completed and accepted.