Chain of custody form for DEP environmental samples, 2001

NYC 9/11 Public Portal Document

Barber Shop - The Barber Shop is located below grade to Liberty Street. This 1,268 sq. ft. open space faces the WTC site. The front door of the business was blown inward. Significant amounts of dust and debris were deposited down into the staircase into the rental space. Floor areas are covered with ceramic tiles. The ceiling is a suspended system composed of fibrous tiles. A void space is above the suspended ceiling. The void space 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 were located in the shop. The head space above the entrance door houses a condenser/compressor unit that was heavily impacted with WTC-related dust and debris. Ceiling tiles, flexible duct, chairs, display shelving, and hair care merchandise were disposed of prior to cleaning. Ancillary rooms that extend under Liberty Street are adjacent to the shop space. These rooms have earthen floors and are believed to be associated with utility companies. They were not cleaned.

Cleaning Method - This unit was cleaned using Test 4A and Test 4E. Test 4A consisted of use of an industrial HEPA vacuum to vacuum floors and other surfaces. An AFD was used during the cleaning process. Test 4E consisted of use of water to wet wipe all horizontal and vertical surfaces.

Cleaning Results - This unit met the clearance criteria listed in Table 1.0 for each compound after being cleaned once.

Supplemental Sampling Activities - One bulk sample of insulation material was collected to determine its asbestos content, in order to address applicable health and safety concerns. Asbestos was not detected in the sample.

Asbestos Before Cleaning Samples - Other than the bulk sample mentioned in the previous section, no other pre-cleanup samples were collected.

Post P‘ Cleaning Samples - Three air samples were collected for asbestos. The samples were analyzed using PCM, TEM AHERA, and PCMe. The PCM results indicate that all three samples were below the detection limit and below the secondary numeric criterion of 0.01 free. The TEM AHERA results indicate that all three samples were below the detection limit and below the secondary numeric criterion of 0.022 S/cc. The PCMe results also indicate that all three samples were below the detection limit and were below the primary clearance criterion of 0.0009 S/cc.

Dioxin Before Cleaning Samples - Four pre-cleaning wipe samples were collected and analyzed for dioxin. The results indicate that dioxin was present; however, the TEQ concentration for each sample was below the primary clearance criterion of 4 ng/m^.

Post P‘ Cleaning Samples - Four wipe samples were collected and analyzed for dioxin. The results indicate that the concentrations of dioxin detected were slightly lower than the pre-cleaning samples. The TEQ concentration for each sample was below the criterion of 4 ng/m^.

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NYC-WTC_000145779