Chain of custody form for DEP environmental samples, 2001

NYC 9/11 Public Portal Document

Post Cleaning Samples (Test 4E) - Three post-cleaning wipe samples were collected. All three samples were below the detection limit. The TEF for each sample was below the primary clearance criterion of 300 pg/m^.

Elevator Shaft/Compactor Room - This area consisted of an elevator shaft with a soil floor and an adjacent compactor room with a concrete floor. Construction was of cinder block walls and exposed floor joists.

Cleaning Method - This area was cleaned using Test 4A. Test 4A consisted of use of an industrial HEPA-filtered vacuum and an AFD. No wet wiping was performed.

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

Asbestos Before Cleaning Samples - There were no samples collected before cleaning.

Post f‘ Cleaning Samples - Three air samples were collected. The three air samples were analyzed using PCM, TEM AHERA, and PCMe. The three PCM results were all below the secondary numeric criterion of 0.01 free. Two of the three results were below the detection limit. Similarly, the TEM AHERA results were all below the secondary numeric criterion of0.022 S/cc. All three of the samples were also below the detection limit. The PCMe results were all below the primary clearance criterion of 0.0009 S/cc, with all three of the samples below the detection limit.

Lead Before Cleaning Samples - There were no samples collected before cleaning.

Post Cleaning Samples - Two air samples were collected after the first cleaning. The two air samples were below the detection limit.

MMVF Before Cleaning Samples - There were no samples collected before cleaning.

Post Cleaning Samples - Three air samples were collected after the first cleaning. MMVF was present in each of the three samples; however, the concentrations were below the primary clearance criterion of 10 S/L.

The Food Exchange - This unit is a 5,000 sq. ft. restaurant occupying three floors. The first floor is at street level with entrances from both Liberty and Cedar Streets. This floor was used for food service and customer dining. The lower level (basement) was used for food preparation and storage. The third level (sub-basement) was used for storage of restaurant equipment. Ceramic tile covers the floor area in both the dining room and the basement. The floor of the sub-basement is packed soil. All exterior windows had been blown inward depositing significant amounts of dust on all surface areas of the first floor. Minimal dust was present in the basement. The first

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