SOW Welding Exhaust System B536.pdf

STATEMENT OF WORK

(SOW)

Welding Exhaust System, B.536

In Support of

437th Maintenance Squadron Joint Base Charleston, South Carolina

17 July 2024

1. BACKGROUND: The Joint Base Charleston (JB CHS) Aircraft Metals Technology shop is currently unable to conduct Aircraft Generation Equipment (AGE) welding operations due to inadequate industrial ventilation. Bio-Environmental (BE) evaluated the existing ventilation system on 07 Nov 2022 and determined that it does not capture contaminants IAW 29 CFR 1910.2529(c)(1)(iii) and 29 CFR 1910.2529(c)(3)(i), leaving workers exposed to potentially harmful fumes during welding operations. BE reported that the ventilation system currently captures less than 30 cubic feet per minute (CFM) of linear airflow, while the minimum requirement for fume emission capture is 100 CFM. The system has been given a Risk Assessment Code (RAC) of 1(II,A) Critical/Imminent.

2. OBJECTIVE: The objective of this task will be to completely replace the existing welding system at the JB CHS Aircraft Metals Technology shop in B.536. The contractor shall be responsible for providing all labor, materials, transportation, supervision, and management to perform installation as it relates to the following tasks, including, but not limited to:

2.1. Demolish Existing Welding Ventilation System

• (3) 12’ fume extractor arms with lighting

• All* associated exhaust metal ductwork (~2,000 lbs) o *Main exhaust duct through the roof shall remain for reuse

• (3) roof-mounted exhaust fans (curbs shall remain) o (2) of the existing exhaust fans serve the welding hood and will be replaced with (1) fan.

Cap and seal third penetration that will not be re-used o (1) of the existing fans serves the exhaust booth system and will be replaced

2.2 Provide New Industrial Welding Ventilation System

• Fume exhaust hood o Hood shall measure approximately 18’ long x 11’ wide

The hood shall be large enough to adequately cover equipment stands measuring 16.6’ tall x 14’ long x 10’ wide.

o 6’ semi-transparent red strip side curtains on three sides that extend to the floor in the lowered position o Integral LED lighting with on-off push button to illuminate the work area o Winch system for hood

Capable of lowering hood to 8’ above finished floor; and raising hood to 17’ above finished floor

Descent Control Safety Protection System IAW CFR 1926.251 o Roof-mounted exhaust fan

Install on existing roof curb and utilize existing duct through the roof penetration

6,200 CFM maximum capacity 3-phase Class B motor

Control System with Variable Frequency Drive (VFD) for an adjustable rate of extraction, from 80-100 FPM of linear airflow around hood perimeter

Associated electrical conduit and wiring (power and controls) Stainless steel low-profile outlet with stainless steel bird screen

• Booth exhaust system o (4) 8” fume extractor arms, each including

(2) fume extractor arms shall have a working radius of 12’; wall-mounted

(2) fume extractor arms shall have a working radius of 17’

• (1) wall-mounted

• (1) beam-mounted

On-off push-button LED light on each fume extractor arm Wall mount for arm when not in use All galvanized ductwork and flex exhaust hose Manual Control Damper on each fume extractor arm o Roof-mounted exhaust fan Install on existing roof curb and utilize existing duct through the roof penetration 3,500 CFM maximum capacity 3-phase Class B motor Control system with VFD for an adjustable rate of extraction at the booth exhaust extraction arms Associated electrical conduit and wiring (power and controls) Stainless steel low-profile outlet with stainless steel bird screen

• Provide all ductwork for Hood and Booth systems o Galvanized rigid duct o Flexible duct connectors at equipment o Constructed and sealed for conveyance of Class 4 air

• Provide new electrical disconnects, conduit, and wiring for power and controls to all equipment.

• Contractor shall provide start-up services and performance verification testing of the equipment, as well as training for Government personnel.

• Local exhaust or general ventilating systems must be provided and arranged to keep the amount of toxic fumes, gases, or dusts below the maximum allowable concentration specified in OSHA's hazardous and toxic substances table (29 CFR 1910.1000).

3. QUALIFICATIONS:

3.1. The contractor shall be responsible for all personnel to gain access to base.

3.2. The contractor shall ensure all employees working on JB CHS possess proper identification documentation.

4. COORDINATION/SCHEDULE: The contractor shall coordinate schedule and other requirements with requirement owner:

Ms. Anna Hill 843-963-4674 anna.hill.1@us.af.mil

5. MATERIALS: Contractor shall provide all materials needed to complete the task. Contractor shall take extra measures to ensure any dust and dirt generated from this project is contained within the immediate construction area. Any dirt and debris tracked outside of the immediate working areas shall be the responsibility of the contractor for clean up at the end of each workday. This includes any adjoining property and roadways. Any work being done shall be done in such a manner as to create a minimal amount of disruption to the ongoing work mission on the property and within the remainder of the complex. Prior to the completion of each workday, the contractor shall do a thorough cleaning of the work area, to include vacuuming of all areas. Restore existing facilities in and around the work areas to their original condition. Employ experienced workers or professional cleaners for final cleaning. Clean each surface or unit to the condition expected in a normal, commercial cleaning and maintenance program.

6. SAFETY REQUIREMENTS: The contractor shall comply with safety provisions, i.e., technical specifications, technical publications, Federal Occupational Safety and Health Administration (OSHA) standards, and other nationally or locally recognized sources of safety, health, and fire prevention standards and practices. The contractor shall be responsible for the safety and accountability of all their personnel and the Government facilities/property and are subject to enforcement authority by federal and state safety and health officials.

7. LOCATION: The JB CHS Aircraft Metals Technology shop is located at 201 Bates St, Joint Base Charleston, SC 29404, Bldg. 536.

8. GENERAL INFORMATION

8.1 Hours of Operation: The base hours of operation are 7:00AM to 4:30PM, Monday through Friday, excluding Federal Government holidays and weekends.

8.1.2 Base Access: A pass or badge is mandatory before any work may be performed on JB CHS. All personnel employed by the contractor in the performance of this contract, or any representative of this Contractor entering the Government installation, shall submit and abide by Security Classification specifications.

8.1.3 Security Requirements: All contractor employees shall carry a Government issued contractor pass at all times while on Joint Base Charleston. Contractor employees or any representative of the Contractor entering the Government installations shall comply with all current base security measures. This includes, but is not limited to, background checks prior to base access, vehicle and goods searches, and identification checks during times of increased security.