VAN VOR Roof Scope of Work - Tremco.doc

Federal Aviation Administration

Scope of Work

FOR

Vance, SC VOR (VAN VOR) Roof Refurbishment Vance, SC

JCN: 1700572

June 23, 2020 Prepared By: Joshua Patton, AJW-2E14K

1.1 Background:

The Vance, SC, Very High Omni-Directional Range (VAN VOR) is located approximately 70 miles south-east of Columbia, SC, off SC 6 W. The facility address is: 147 Naval Station Road, Santee, SC. This facility is maintained by the Charleston, SC Service Support Center (SSC) and resides in the Columbia District.

The Vance VOR (VAN VOR) is an unmanned navigation system radiating a Very High Frequency (VHF) radio signal to a compatible airborne receiver to give pilots a bearing relative to the facility. The VAN VOR is a navigational aid for airborne VHF equipped aircraft.

The VOR’s ‘emanating and active’ antennae is located inside the VOR Tee Pee, located on the top of the roof. The VOR is also equipped with a Tactical Air Navigation System (TACAN), located on top of the VOR Tee Pee.

Figure 1.0 Vance VOR – (VAN VOR) The VAN VOR was commissioned in 1960 and is scheduled to be decommissioned in April 2021 since it was not assigned as a facility on the minimal operational network (MON).

Additional facilities at the VAN VOR are as follows:

· VAN TACAN

· VAN DME

· VAN RCO

The VAN TACAN and VAN RCO are scheduled to be decommissioned with the VOR in April 2021. The VAN DME does not have an assigned date of decommissioning, however it is believed it will be decommissioned in approximately 5 years.

The base substrate layer to the roofing system is 2” nominal tongue and grove 2X6 lumber. The approximate square footage of the VOR roof is 2,190 sq. ft.

The base building has had several leaks and repairs with majority of the leaks near the Tee Pee. There is limited staining on the ceiling tiles and they will not be replaced.

Figure 2.0 VAN VOR – 2x6 Decking (Base Decking to Roofing System)

Figure 3.0 VAN VOR – Membrane Roof Patch The roofing system is a Torch Applied, modified bitumen roofing system. The bitumen sheets are rolled and heat applied for a ‘welded’ seam. The bitumen sheets may cover insulation, but it is unknown at this time. The bitumen covers the ‘counterpoise’ a galvanized sheet metal (spot welded). The roofing system rests on the tongue and groove decking.

The roof has leaked in the center section of the roof. The leaking has created a hazard to the operational navigation equipment located in the Main Equipment Room of the Building. In addition to jeopardizing operational navigational equipment, this leak condition is likely to get worse the longer left unaddressed.

Figure 4.0 VAN VOR – ‘Torch Applied’ Modified Bitumen Roofing System The existing roofing system has been tested and known asbestos is within the both the roof material and mastic at an estimated level of 3% in the roof material and 35% in the mastic. The contractor shall make proper precautions to prevent human interface with the asbestos.

1.2 Scope of Work:

ROOFING SYSTEM:

1) Inspect the roof membrane for blisters, entrapped moisture, or insufficient adhesion to the roof deck. Replace blistered or poorly adhered modified bitumen and mop down new patch areas where needed. Allow 30 days of weathering to new modified bitumen, or apply solvent wipe to reduce any residual oils prior to application of roof coatings.

2) Isolated blisters are to be scored in a cross-cut fashion, peeled back to expose the base sheet, apply Polyroof SF mastic to base sheet. Re-set the membrane and apply weighted pressure to the center of the repair for a minimum of four hours. Reinforce these repair areas over the course of the resurfacing effort as described in step #4.

3) Use a broom, power blower or roof vacuum to remove loose granules and roof debris. Power washing may then be allowed to proceed using a wide fan spray and 800 psi max pressure. Allow roof to dry thoroughly before proceeding with application of the fluid applied roof membrane. Water is located at the site for use by the contractor.

4) Probe field seams where bleed out of asphalt adhesive is absent. Over loose field seams, minor ridge lines and “mole runs” embed 6-inch polyester membrane into a base coat of Alpha Guard Base Coat. Back brush the fabric with a soft bristle brush to prevent wrinkles, voids or open edges. Do not allow fabric to be exposed to moisture or exposed overnight unless fully encapsulated.

5) Apply a three course of 40-inch fabric around TeePee, using Alpha Guard Base Coat throughout the application on smooth surfaces.

6) Roll apply base coat of Alpha Guard MT at 3.0 gallon per roofing square immediately roll 1 ply Alpha Guard fiberglass in to the Alpha Guard Base Coat. To minimize bleed, allow base coat to cure for a minimum of 48 hours before application of additional field coatings.

7) Inspect roof for insufficient mil thickness, voids in fabric, or other irregularities.

8) Apply finish coat of Alpha Guard MT Finish Coat at a rate of 2.0 gallons per square.

9) Power wash and scrub the entire Tee Pee with a bristle brush and soap. When dry, caulk the seams of the entire TeePee with a polyurethane caulking (Tremseal Pro). Furnish and install new hardware of the same type and size on the Tee Pee door (i.e. plastic nuts and bolts). (Contractor to execute with FAA guidance)

1.3 Site Pictures:

1.4 Supporting Tasks:

· The AJW-2E14K project engineer will take periodic construction updates/pictures and will be involved with the Contractors Acceptance Inspection (CAI) and Joint Acceptance Inspection (JAI).

· AJW-2E14K will solicit a contractor to perform the construction outlined in items previously listed in this Statement of Work. The AJW-2E14K project engineer will recommend any local and reputable names the SSC Manager may provide and pass along to the logistics for possible bidding.

· AJW-2E14K project engineer will research, and coordinate with the SSC manger, to determine the necessary VOR (or other related facilities) facility outage prior to commencing work. The project engineer will relay this information to the contractor.

· AJW-2E14K project engineer will develop the schedule and coordinate the project.

· AJW-2E14K project engineer will acquire a Resident Engineer (RE) for the construction duration.

· An Integrated Risk Management Checklist (IRMC) will be completed and approved prior to construction by the AJW-2E14K project engineer.

· The appropriate ORM documents and coordination will take place prior to the preconstruction conference.

· The SSC Manger will provide staffing throughout the project as necessary.

Joshua Patton, FAA Project Engineer

Mailing:

Atlanta Regional Office

1701 Columbia Ave

College Park, GA 30337

ATTN: Joshua Patton AJW-2E14K

(404) 678 – 4573

Scott Scheffel, FAA SSC Manager

Mailing:

Scott Scheffel FAA Charleston SSC

5775 S Aviation Ave

Charleston, SC 29406

(843) 414-2850

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