Law Department notice on WTC document preservation, Oct 2001

NYC 9/11 Public Portal Document

Non-Study

Barber Shop This unit is located in the basement.

Cleaning Method: Test 4A - Surface cleaning using industrial HEP A filtered vacuums. Area air filtration utilizing an air filtration device (AFD). Test 4E - Water wet wipe of all horizontal and vertical surfaces. Equipment Used: Nilfisk™ Vacuum (CFM 127), AFD. Filtration Status: HEPA Unit Size: 1,268 sq. ft.; 15,216 cu. ft. AFD Status: Required AFD Specification: 400/600 cfm Unit Air Exchange Rate: 25.36 min @ 600 cfm Minimum Air Exchange Rate: Every 30 minutes

Unit Description: This 1,268 sq. ft. open space facing the WTC Site is located below grade to Liberty Street. The front door of the business was blown inward depositing significant amounts of dust and debris down the staircase into the rental space. Floor areas are covered with ceramic tiles; the ceiling is a suspended system using fiberous tiles. Above the suspended ceiling is a void space which accommodates flexible A/C ducts, electrical conduit and lights. All structural support members above the ceiling are encapsulated with a non-asbestos insulating material. Equipment including chairs, wash sinks, counters and hair care displays are located in the shop. The headspace above the entrance door houses an A/C condenser/compressor unit that was heavily impacted with WTC contaminated dust and debris. Ceiling tiles, flexible duct, chairs, display shelving and hair care merchandise where disposed of prior to cleaning. Adjacent to the shop space are ancillary rooms that extend under Liberty Street. These rooms have earthen floors and are believed to be associated with utility companies. They were not cleaned.

Difficult Areas Encountered: • Sprayed-on insulation/fire protection applied to structural members in the void space above the suspended ceiling prevented effective vacuuming of the area. • Significant quantities of WTC dust and debris were deposited into the remote A/C condenser/compressor unit and associated housing. • The space above the fixed ceiling at the entrance to the Barber Shop stairwell was heavily impacted, requiring special preparation for access and removal of bulk quantities of WTC dust/debris.

24

NYC-WTC_000145200