NYC-WTC_000195194

NYC 9/11 Public Portal Document

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

Tridymite Before Cleaning Samples - There were no pre-cleaning samples collected.

Post P‘ Cleaning Samples - Two air samples were collected after the first cleaning. Both were below the detection limit.

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

Post P' Cleaning Samples - Two air samples were collected after the first cleaning. The results indicate that MMVF was present in one of the samples; however, the concentration was below the primary clearance criterion of 10 S/L. Because the air samples were below the primary clearance criterion, no additional samples were collected for analysis of MMVF.

PAH Before Cleaning Samples - There were no pre-cleaning samples collected.

Post f Cleaning Samples - There were no post-cleaning samples collected.

Unit 3A - This 1,368 sq. ft. loft faces Cedar Street and is utilized as office space for the Baldwin Realty Company. Carpet is present on half of the floor space; the remainder is hardwood floors. * The area is furnished with 10-12 wooden desks, files and office equipment. The unit presented 49 minimal dust accumulation in the dwelling. No windows were blown in.

Cleaning Method - This unit was cleaned using Test 2B: a Craftsman® shop vacuum and a Eureka® upright vacuum with HEPA filter. An AFD was used during the cleaning process. All horizontal surfaces were wet wiped.

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

Asbestos Before Cleaning Samples - Four air, four micro vacuum and four wipe samples were collected for asbestos. These samples indicate that asbestos was present in the unit prior to cleaning. All four of the micro vacuum samples detected chrysotile. One of the four wipe samples detected chrysotile. The PCM results for both air samples were below the secondary numeric criterion, and the two PCMe air results were below the primary clearance criterion of 0.0009 S/cc.

Post P‘ Cleaning Samples - Three air, four micro vacuum and five wipe samples were collected for asbestos. Three asbestos air samples were analyzed for PCM, TEM AHERA, and PCMe. The PCM results indicate that one sample was below the secondary 45

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