Tower_SOW_-_2019.docx

STATEMENT OF WORK

1.0 INTRODUCTION: Construction of self-supporting communication towers. The contractor shall provide all Soil Geotechnical Reports, materials, drawings, transportation of materials to site, personnel, equipment, tools, supervision, and other items and non-personal services necessary to perform “turnkey” Radio Tower Installation and Dismantle.

2.0 BACKGROUND: Nationwide the Forest Service has approximately 1,800 Communication towers, of these towers the majority need replacement due to:

1. Age - most of the sites are greater than 30 years old.

2. Damage – From Wind, Snow, and overloading.

3. Rusted – Tower legs and guy wires have pitting rust

4. Degrading Bases – Concrete standards were not in place at the time of the tower build and erosion exposed the base causing ice to deteriorate the base.

5. Guyed Towers – Due to cost of maintenance, guyed towers are being decommissioned. These towers no longer meet Forest Service and ANSI EIA/TIA safety standards and need replacing.

3.0 SCOPE: The contractor shall provide services for tower and antenna installation. The services shall include: site visits, tower and site engineering, P.E. certified drawings for Self-Supporting towers to include total “Turnkey” solution of ground preparation, tower related materials, entry panels, grounding system, lightning protection system and pre-build and post build resistivity testing results, purchase and installation of antennas and related material to include coaxial cable, lightning arrestor, ground bus bars and mounting hardware to meet industry standards. The contractor shall be required to obtain construction bonding and requisite insurance sufficient to support the individual contruction of towers, as appropraite.

4.0 GEOTECHNICAL INVESTIGATIONS (Normative) ANSI EIA/TIA 222H - Annex G Vendor shall be responsible to perform and provide a Geotechnical Report to the Forest Service prior to the commencement of tower project. The following are the guidelines set forth in the ANSI EIA/TIA 222H manual.

PART I - THE SCHEDULE

SECTION C - DESCRIPTION/SPECS./WORK STATEMENT AG-7604-C-13-0005

This Annex contains information that should be contained in a geotechnical investigation.

Boring logs and report should include the following:

1. Date, sampling methods, number and type of samples.

2. Description of the soil strata according to the Unified Soil Classification System.

3. Depths at which strata changes occur referenced to a site benchmark elevation.

4. Standard Penetration Test blow counts for each soil layer.

5. Soil density for each soil layer.

6. Internal angle of friction for each soil layer.

7. Cohesion for each soil layer.

8. Ultimate bearing capacities for each soil layer or at the recommended bearing depth(s).

9. For expansive soil conditions, the active zone of influence and recommendations for design.

10. Elevation of free water encountered and the ground water depth below grade to be considered for design.

11. Frost depth to be considered for design.

12. Soil electrical resistivity, pH values and corrosive nature of soil.

13. Other pertinent soil design data and recommendations.

14. Recommendations for alternate foundation types.

15. Topographic information for the site.

16. Note the location within 1,000 ft. [300 m] of the structure of underground pipelines, buried concentric neutral power wires and electrical substations as these may affect electrolytic corrosion.

For drilled piers the following information shall also be provided:

1. Ultimate tip bearing capacity.

2. Ultimate skin friction for each soil layer.

3. Lateral modulus of soil reaction for each soil layer.

4. Ultimate soil strain at 50% of ultimate compression, 50, for each soil layer.

For rock anchors the following information shall also be provided:

1. Type and condition of rock.

2. Rock quality designation, RQD.

3. Percent rock sample recovered.

4. Ultimate bond stress in the interface between the rock and grout.

5. Ultimate shear strength.

5.0 SITE VISIT:

The contractor may need to perform site vists prior to commencing construction of individual towers. Should site visits be required, the contractor shall provide the government radio technician with the date, time, and meeting place for the site visit as well as types of vehicle that may be necessary for traversing the area.

6.0 GROUNDING:

6.1 The Forest Service uses the National Electrical Code (NFPA 70) and National Fire Protection Association (NFPA 780). It is recommended that all personnel responsible for the installation, testing, and maintenance of Forest Service grounding and lightning protection systems reference the NEC, and NFPA 780 standards for more detail on the subjects contained in this document.

6.2 Fall of Potential Method: The contractor shall perform ground resistivity testing using the Fall of potential (also known as the 3 point fall method) is the most recognized method for measuring the resistance to earth of a gounding system, or ground system performance. Pre and Post tests shall be documented and supplied to the FS POC.

6.2.1 Grounding Performance Objectives

Conductivity-to-ground is the primary goal for an effective grounding system. The acceptable maximum results shall be ten (10) ohms of resistivity. If geotechnical investigation identifies high resistivity at the site optional grounding designs may be requested. If initial post install resistivity test exceed twenty five (25) ohm, no work shall continue until Forest Service reviews and agrees to grounding options. Post installation, contractor shall perform a final system test for compliance and report the results.

7.0 TOWER:

All specifications shall meet as a minimum, ANSI TIA/EIA 222 Rev H. “Structural Standards for Antenna Supporting Structures, Antennas and Small Wind Turbine Support Structures” based on:

Height of Tower: Refer to the specfic project Tower Request Form Wind and Ice Load Calculations: Based on ANSI EIA/TIA 222H Equipment Load Calculations: Refer to the specfic project Tower Request Form Risk Category (Class of Structure): Based on ANSI EIA/TIA 222H Table 2-1

8.0 TOWER SPECIFICATIONS

· Tower shall have Solid Core, Angle Iron, or sealed tubular legs and are to be dipped galvanized.

· Tower obstruction lighting requirements shall meet:

· FAA Regulations “FAA AC-70-7460-1, “Obstruction Marking and Lighting”.

· Local Forest Service Unit Regulations (Provided for each Tower by Local Unit).

· Tower design shall support wind loading of all antennas, mounts, and coaxial cables listed in the specifications.

· Prebuild and post build designs shall be provided showing the tower, grounding system, ice bridge and relationship to any existing structures.

· Include 3 sets of P.E. Stamped document stamped with the seal of the state the tower is being built.

· Antenna and coaxial cable installation shall be connected to the single point ground system shall be supplied with the tower, all materials shall be installed in accordance with and in compliance with National Electrical Code (NFPA 70) and National Fire Protection Association (NFPA 780) for Installation of Communications Equipment.

· Waveguide Ladder: Shall support a minimum of two (2) runs of coaxial cable over the current antenna system. The Waveguide Ladder shall have ¾” holes and accommodate coax hangers. Vertical Spacing between waveguide ladder rungs shall not exceed three (3) feet. All waveguide / Cable shall be secured to waveguide ladder.

· Climbing Ladder: Shall be provided that extends from the base to the top and situated for convenient climbing of tower. Climbing ladder shall provide anti-climb protection to discourage un-authorized climbers. Climbing ladder may be integrated into the tower design.

· Safety Climb Cable: Shall be provided that extends from the base to the top and situated for convenient climbing of tower. The fall stop assembly shall be removable to prevent weathering and corrosion. Device shall comply with current ANZI and OSHA standards.

· Ice Bridge: Shall be installed from the tower to the building entrance panel. Ice Bridge shall provide protection to the cables from falling ice and provide a means to support the cables from the tower to the building. Ice Bridge shall be self-supporting, galvanized, connected to the tower or building and include a perforated or solid cover. Ice bridge supports are required on both sides and may be staggered. The gap from the ice bridge to building or tower will not exceed 12 inches. Coaxial cables shall be supported via trapeze kits and appropriate hangers.

· Entry panels: Minimum of 2 entry ports shall be installed at building entrance and shall include all necessary weather proof boots and cushions to accommodate the required number of antenna cables. All unused holes shall be sealed with appropriate product plugs (silicone or foam is not acceptable).

· Ground Dispersion System: Contractor shall design and install a ground field and ground system around the base of the tower. The resistance shall conform to TIA-222H standards of ten (10) ohms or less. Alternate deisgns will be allowed when approved through the contract COR. Contractor shall demonstrate and provide certification of measurement using the Standard Three Point/Fall of Potential method. A design layout shall be provided of the proposed grounding system prior to starting construction . All ground field connections to the tower Shall be exothermic welds using #2 solid copper cable or larger. The Contractor shall connect to all metal structures within 15’ of the nearest approach of the ground field conductors. This includes, but not limited to, buildings, site fencing, propane tanks, generator, ice bridge, exterior ground bar, etc. When below grade these connections shall be via exothermic weld when possible .

· Copper Ground Bar: An appropriatately sized copper ground bar, minimum 4” x 24” x ¼” shall be installed beneath the buildings entry panel(s). External ground bar shall be connected to the grounding conductors of the ground field using #2 solid copper cable or larger. The below grade grounding connections shall utilize the appropriate antioxidant compound, and be weather sealed. Each coaxial cable shall be grounded, using the appropriate sized ground strap, to the tower at the antenna, to the tower ground bar at the tower base and to the external ground bus bar at the building entrance. Attachment of the tower ground bar to the below grade ground may be with tinned non- reversible compression lugs and tinned #2 solid copper cable. Ground attachment points on the tower may make use of existing bolts, or may use beam clamps of galvanized or stainless steel construction. Antennas and cabling to include antenna mounts, cable hoisting straps, cable attachment clips, grounding kits, external and tower ground bars as necessary. An internal Master Ground Bus will be installed in a location near the building entry port.

· Cable Runs: Heliax cable appropriate the run length (Minimum of 1/2”) shall be used for all runs. Contractor must supply documentation of cable specifications. All cables shall be secured to tower using appropriate hangers. Cables shall be installed on the cable ladder in an orderly fashion, with the highest antenna lines to be toward the center of the ladder. All cables shall be grounded at the antenna, at the bottom of the tower and at the building entrance as stated above. Coaxial cables shall be labeled at the point where they leave the tower and at the inside termination. This labeling shall include the antenna make and model, frequency range, and location on the tower. The interior labeling may be label printer tape, and the outside labeling shall be stamped metal, laminated cardstock, or similar weatherproof method. All cables shall be terminated with N Male connectors (or as needed for direct attachment to antenna and Polyphaser protector). Cable shield ground attachment points and antenna connections shall be weatherproofed to industry standards, using mastic and tape or cold shrink protection, if mastic is used; a courtesy wrap (Single wrap of electrical covering both end of the connector) tape shall be installed on antenna connections. Coaxial cables shall be secured to the standoff using an appropriate hanger (zip ties of metal banding will not be acceptable.)

Coaxial line lightning/surge protection device, similar to Polyphaser IS-5ONX-C2-MA will be installed near to the internal Master Ground Bus and grounded to the Master Ground Bus.

· Antennas: All antennas except dish and yagi shall include an 18” to 36” standoff mount that attaches to single leg. Standoff mounts are to be adjustable for leg tilt if present, so that antennas are installed vertically. All side-mounted antennas shall be secured to the tower at the top and bottom of the antenna mast or as otherwise directed by local telecom personnel. If specific antennas are stated in the tower request form, no antenna substitutions are allowed without acceptance of the Forest Service. All antennas shall be identified and a list of the locations on the tower shall be provided upon completion.

· Access to Site: Public roads to site shall be accessible with travel available late spring through late fall. At the site, it shall be the contractor’s responsibility to provide access to the construction site for their heavy equipment. If no access road is provided, it is the responsibility of the contractor’s to return any and all areas to access to their original conditions. It shall be the contractor’s responsibility to repair any damage to access road by project equipment and return it to its’ previous condition.

9.0 DEMOLITION:

· The removal of existing towers or Telecommunications structures will be done in a way that no damage will occur to remaining structures/equipment

· Any damage caused by the removal of the structure will be the responsibility of the contractor to repair

· All concrete foundations and/or anchors will be removed to 18” below grade

· Disposal of all demolition debris shall be discarded in accordance with state, federal environmental regulations as applicable.

10.0 SAFETY PLAN

· Provide detailed description of a safety plan for review.

· Vendor must comply will all Occupational Safety & Health Standards (OSHA) Safety Standards for climbing and tower installation

· Information may be obtained at www.osha.gov or you can contact OSHA 800-321-6742.

· Vendor must provide fencing around the immediate installation of the communication tower and foundation when not working at site.

C- 1 Project Location Refer to the Bill of Materials and Tower Request Form for the project specific location. Work may be performed at any location within the boundaries of the Continetal United States, Alaska, Hawaii, Puerto Rico and Territories the Forest Service presides over.

C- 2 Start Work and Period of Performance The estimated start work date and completion schedule will be identified on each Bill of Material Price Request. Unless otherwise agreed, this schedule will be the contract time for the project.

The Contract Period of performance will be:

Base – Award Date through September 30, 2020 C- 3 Government-Furnished Property Government Furnished Property (GFP) is not available at this time. However, should the Government opt to provide GFP for a specific project, the GFP listing will be furnished by the Government and properly identified on the Bill of Material Price Request.

C- 4 Standard Specifications "Structural Standards Antenna Supporting Structures, Antennas and Small Wind Turbine Support Structures” (ANSI EIA/TIA 222H) are included in this solicitation by reference only. The requirements contained in these Specifications are hereby made a part of this solicitation and any resultant contract.

Electronic versions of the “Structural Standards Antenna Supporting Structures, Antennas and Small Wind Turbine Support Structures” (ANSI EIA/TIA 222H), are available on the American National Standards Institute at http://www.ansi.org/default.aspx C- 5 Project Specifications – Including Standard and Supplemental Project Specifications The Tower Request Form will include a list of all Standard Specifications and a copy of any Supplemental Project Specifications that directly apply to the project.