OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Post P‘ Cleaning - Five air samples were collected from the first floor and one air sample was collected from the basement. The samples were analyzed for PCM, TEM AHERA, and PCMe. The PCM, TEM AHERA and PCMe analyses of the five samples collected from the first floor could not be conducted due to overloading of particulate material. The sample collected from the basement met the primary clearance criterion and secondary numeric criterion.
Post Cleaning - Seven air samples were collected after the second cleaning. The samples were analyzed for PCM, TEM AHERA, and PCMe. The PCM results were all below the secondary numeric criterion of 0.01 free. Five of the samples were below the detection limit. The TEM AHERA results were all below the secondary numeric criterion of 0.022 S/cc, with six of the seven samples below the detection limit. The PCMe results were all below the primary clearance criterion of 0.0009 S/cc, with six of the seven samples below the detection limit. The seventh sample was at the detection limit of 0.0005 S/cc. This indicates that the cleaning techniques were effective at removing particulate matter after the first cleaning, which allowed valid asbestos air samples to be collected. The results indicate that the unit met the primary clearance and secondary W numeric criteria.
HPAC System - Four air samples and two wipe samples were collected after the HVAC system was cleaned. The air samples were analyzed for PCM, TEM AHERA, and PCMe. The PCM results were all below the secondary numeric criterion of 0.01 free. The TEM AHERA results indicate that two samples were below the detection limit and that two 9 samples were equal to the detection limit of 0.0005 S/cc. The PCMe results indicate that all four samples were below the detection limit of 0.0005 S/cc.
The results for the two asbestos wipe samples indicate that both samples were below the detection limit. The detection limit (12,100 S/cm^) was higher than the detection limit (approximately 3,000 S/cm^) for most other wipe samples on this project.
Dioxin 4 Before Cleaning Samples - There were no samples collected and analyzed for dioxin.
Post P* Cleaning Samples - There were no samples collected and analyzed for dioxin. •w HVAC System - There were no samples collected and analyzed for dioxin.
41 Gypsum Before Cleaning Samples - Pre-cleaning air samples were not collected. . 4*
Post P‘ Cleaning Samples - There were no samples collected after the first cleaning for gypsum.
HVAC System - One air sample was collected for gypsum. This sample was below the detection limit.
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CITY_21MC100_011105323
NYC-WTC_000195289
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