Final Report Volume 1, WTC Unoccupied Building Monitoring, 125 Cedar

NYC 9/11 Public Portal Document

Final Report 125 Cedar Street, NYC, NY

• Engineering g 8 Controls Action employed the following engineering controls during the removal of all ACM from the work areas:

■ Isolated each work area per Contract Documents, and to the satisfaction of the on- site Project Monitor. ■ Constructed a three-stage decontamination unit with shower. ■ Installed HEPA-filtered negative pressure exhaust fans. ■ Engineering controls were inspected by ATC for compliance with all applicable local, state, and federal rules and regulations.

Work Procedures

Measures to minimize the release of fibers during cleaning included:

■ Wetting of settled dust with water prior to disturbing. ■ Promptly placing removed settled dust in plastic bags for proper disposal. ■ Wet wiping and HEPA vacuuming all surfaces.

40 Worker Protection

Workers who entered the work area during cleaning activities wore disposable protective clothing (Tyvek suits) and proper respiratory protection including %x face, air purifying respirators with High Efficient Particulate Air (HEPA) filters.

Decontamination

Workers performed proper decontamination upon exiting each work area by:

■ Removing and disposing of protective clothing. ■ Removing and Rinsing respirator. • Showering. ■ Donning street clothing.

Disposal

Action placed asbestos-containing waste material in doubled and labeled impermeable plastic bags and transported them to enclosed roll-off containers lined with polyethylene sheeting for pickup and disposal.

ATC Project No. 15.22906.0002 Page 4

NYC-WTC 000129381