CHS VOR Scope of Work 11-18-2020.pdf

SCOPE OF WORK

CHS VOR, Replace Roof And Repair Charleston, South Carolina 11/18/2020

1.0 BACKGROUND

The CharlestonVOR Facility is contained in a 36’x36’x12’high equipment building. It has a 52’ diameter flat wood roof with a galvanized steel counterpoise extension that totals 100’ in diameter.

There’s a 20’ tall, cone shaped antenna cover “teepee” on the roof. There are 50, 4’ tall, Doppler detector antennas with “mushroom” type covers attached around perimeter of wood roof. It has an equipment room, storage room, EG room, and a closet.

The FAA wants to replace the building roof system with a new soldered, flat seam copper panel roof and membrane, install new GFM fiberglass antenna shelter (teepee), remove and re-install 50 Doppler antennas, replace soffit & fascia, replace 200 sqft of ceiling tiles, and clean the Equipment & EG room floor tiles.

1.1 SCOPE OF WORK

The Contractor shall perform the following work:

1. Provide asbestos testing services prior to construction start. Cut a 6”x6” sample through all layers of the roof down to the wood deck. Use tin snips to cut through the sheet metal layer. Patch resulting hole in roof with 1 gallon roof repair mastic. Submit samples to an asbestos/environmental testing laboratory licensed in the State of South Carolina. Provide test results to the FAA. Unless test results prove otherwise, contractor should assume the presence of asbestos and lead in the existing roof materials and dispose of accordingly per state of South Carolina rules and regulations.

2. Provide a new flat seam copper panel roof in accordance with methods described in the Copper Development Association CDA Publication A4050 Part 8. Roofing Systems, Section 8.5 Flat Seam Roofing and, FAA Drawing Series ECG-1302939.

3. Flat seam copper panel roofing shall meet ASTM standard B370 H00. New roofing sheets must be cold rolled, 99.9% plain copper. The name “terne plate” is used in this scope of work and drawings to describe both the new and the old existing roof sheets. Furthermore, terne plate is old nomenclature that must not be used when ordering new roofing sheets.

4. Provide a sample roof panel. After material samples are approved and prior to starting flat seam copper panel roof work, a 4’ x 5’ portable sample panel of copper panel/sheet metal over plywood shall be constructed on site. The sample shall be located per directions from the FAA RE. Panel shall be built in accordance with Specification CHS VOR 1400248, Div 2 Skills & Qualifications.

5. Furnish and install a new copper panel and elastomeric reflective roof membrane on CHS VOR equipment building. Remove and discard old roof. Clean and prepare surfaces for new roof. All work to be done in accordance with the attached drawings & specifications.

a) This work requires an extended shutdown of VOR service. Provide one month advance notice to FAA. Verify NOTAM’s have been made. Obtain written permission from FAA to begin work.

b) Make arrangements with an FAA Technician to take the VOR out of service & de-energize antenna power. Un-fasten antenna cable located within teepee and remove electrical wiring harness from antenna motor. Wrap connectors in plastic bags w/electrical tape to prevent damage during construction.

c) Provide crane services to remove fiberglass antenna cover. Cover is cone shaped 20’ high with 10’ diameter base. Cover weighs approximately 500lbs. Unbolt top cover & ring and remove from main teepee. Unfasten & pry off main teepee and remove from roof deck.

d) Unbolt and remove 50 mushroom antennas, brackets and, posts. Carefully collect all nuts, bolts, washers & plates and, store for re-use. Arrange with FAA Technician to disconnect coaxial cable from each antenna. Protect coax connectors with plastic bags and electrical tape. Tie wrap antenna cables out of the way.

e) Completely tear off all old roofing, copper panel/sheet metal plate, and vapor barrier in order to fully expose wood roof decking. Carefully cut any metal connecting the metal counterpoise extension to the roof with metal shears. Disconnect grounding down leads. Provide a 2” space separating wood roof from metal extension. Broom clean all debris from deck.

f) Tear off all old roofing from underneath teepee. De-solder old terne plate from steel antenna pedestal mounting ring.

g) Repair and replace any damaged wood decking with new 2”x6”, type 2, pressure treated lumber.

Contractor will include 500 square feet of wood deck replacement in his base bid. Any damaged wood that exceeds 500 square feet shall be replaced by contract modification per unit price. This unit price must be contained in the Contractor’s bid offer.

h) Completely remove mushroom antenna threaded rod brackets. Save all small parts for re-installation. Remove vinyl soffit panels to gain access to bolts on underside. Store soffit panels for re-use.

i) Repair and replace any damaged mushroom antenna support brackets. Replace any bad fasteners with new galvanized nuts & bolts.

j) Provide a new Copper Panel/Sheet Metal and Elastomeric Roof System in accordance with drawing series CHS-1400248.

k) Install ¾” plywood, vapor barrier, rosin paper and, 18” x 24” copper pan sheets in accordance with specifications.

l) Solder copper panels securely to the antenna pedestal and, (4) 4” x 12” bent copper plates on edge of roof and re-connect existing 2/0awg grounding down conductors.

m) Solder a #6 AWG BSDC conductor every 2’ from the copper panels to the extended counterpoise.

n) Install a fully adhered, single ply, liquid applied roofing membrane in accordance with Section 7 of the contract specifications.

o) Provide new 8” wide, 24 gauge, folded, copper metal edge trim around entire 164’ perimeter of roof.

p) Provide the services of a licensed surveyor. Set a transit on center of antenna platform. Follow instructions given by Resident Engineer and in specifications to mark new locations for mushroom monitor antennas. Re-attach monitor antenna brackets.

q) Reinstall 50 Doppler Antennas.

r) Provide crane services. Install new GFM fiberglass teepee on top of roof. Position neoprene gasket under teepee. Place teepee on roof and bolt into final position. Provide a liquid applied, 2’ wide, roof membrane flashing around entire perimeter of teepee. Completely seal off the construction joint at base of teepee.

s) Re-attach the antenna motor, top cover & ring. Re-connect all antenna cables & power wiring harness.

u) Provide 50 pitch pockets. One for each mushroom antenna mount. Fill pitch pockets with a material that meets the roofing manufacturers recommendation. Re-attach the 50 mushroom antennas. Replace any damaged or badly corroded fasteners. Re-connect the antenna cables.

v) Make arrangements with the FAA to re-energize VOR and place it back into service.

6. Replace damaged 2’ by 4’ ceiling tiles in equipment room with similar. Provide for 200 sq.ft. of replacement.

7. Improvements to facility floors:

a) Strip, clean, and buff the floor tiles in the Equipment room and Engine Generator room.

1.3 DRAWINGS

CHS-1400248-G001

CHS-1400248-G002

CHS-1400248-G003

CHS-1400248-D001

CHS-1400248-A001

CHS-1400248-A002

CHS-1400248-A003

CHS-1400248-E001

1.4 SPECIFICATIONS

a) CHS 1400248

b) CDA Publication A4050-04/18

c) FAA-STD-019E

d) FAA-C-1217F

e) FAA-C-1391C

f) NFPA 70

1.5 SUBMITTALS

The Contractor must submit information to FAA about all products, procedures, tools, and equipment selected for new work. All items shall meet FAA approval before work begins. Submittals will include the following:

a) Work Schedule

b) Bonding and Insurance

c) Safety and Accident Prevention Plan

d) Emergency Medical Action Plan

e) Old roof sample Asbestos test results

f) Old roof materials disposal plan Materials, Tools & Equipment contained in Part 1.1, 2 through 7 above

g) 2”x6” wood deck, Vapor barrier, rosin paper

h) 20 oz. copper panel/sheet metal, 4”x12” copper ground plates, solder, soldering iron

i) Roof elastomeric sheets, liquid, special tools, heat gun,

j) Copper trim & fasteners.

k) Roof system warranty.

l) Paint & primer.

m) Equipment, cranes, man lift, boom lift, or aerial work platform

n) Vinyl siding

o) Ceiling Tile

2.0 GENERAL REQUIREMENTS

a) All materials used must be approved by the FAA before installation.

b) All shutdowns and cutovers shall be coordinated with and scheduled by local FAA Air Traffic Management

c) Contractor will stage work in a manner that minimizes CHS VOR outage time.

d) Protection of work. Contractor shall not leave roof open to elements and will have enough tarp on hand to prevent water from entering building. Building roof will remain covered at all times.

e) Contractor shall repair any damage done by him to any entity, at his cost. Contractor shall be covered by minimum locally required liability.

f) Contractor must provide FAA with a safety and security plan before any work begins. Plan will include procedures for accident prevention, emergency procedures, phone number & map to nearest emergency medical facility.

g) Contractor shall provide FAA with a roof construction materials disposal plan. Contractor shall dispose of all materials in a landfill licensed to accept construction waste.

h) Contractor's Superintendent shall be present at the work site during all times work is performed. Superintendent shall carry a cell phone and, be prepared to make and receive calls to & from the FAA at all times while on work site.

2.1 WORK HOURS AND CONDITIONS

Worksite is located in Charleston County at Charleston International Airport in Charleston, South Carolina.

a) Work will be performed under the authority of the FAA Resident Engineer.

b) Roof repair must be complete within sixty calendar days to return facility to NAS service.

c) Contractor will report & coordinate each days work in advance with an FAA technician that is trained to operate and repair VOR equipment.

d) Work will be done during daylight hours between 7:00AM to 4:30PM. Mon thru Fri. Any variation from this schedule must be approved by the CO and COR.

e) Contractor will provide a porta john, potable water and an emergency medical kit on site.

f) Emergency Medical Action Plan will be posted in plain view at the work site.

g) Saturday & Sunday work will only be allowed to expedite roof repair in the event of rain.

h) Contractor shall give FAA at least 48 hours notice before weekend work will be approved.

3.0 PRE – BID SITE VISIT

The Contractor is expected to carefully examine the areas of the proposed work, to see first hand the extent of work involved. The submission of a proposal will be considered evidence that the bidder has made such examination and is satisfied as to the conditions to be encountered in performing the work.

The FAA Contracting Officer will provide a date for one official site visit with the Engineer. If any other visits are needed, Contractor must give FAA at least five days advance notice before appearing on site.

All visitors must be escorted by an FAA employee, or other authorized personnel.

4.0 LOCATION

FAA ECG VOR

32.8943192 N, 80.0378142 W

Charleston International Airport

5.0 CONTACTS

Scott Scheffel, CHS SSC Coordinator FAA Charleston SSC 5775 S Aviation Ave Charleston, SC 29406 w: 843-414-2850 c: 843-780-0021 scott.scheffel@faa.gov

Shane C. Harvey, FAA Engineering 1701 Columbia Ave College Park, GA 30337 w:404-305-7447 c:404-632-9774 shane.c.harvey@faa.gov

6.0 FAA USE ONLY

JCN: 1400248

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