NYC-WTC_000232959

NYC 9/11 Public Portal Document

Table 10 Summary of Airborne Fibers at Locations Where Only Synthetic Vitreous Fibers (SVF) Were Detected in Settled Surface Dust

Outdoor Areas in Lower Manhattan Building Area Asbestos in Dust SVF in Dust (PLM)* Aggressive Fibers in Air (PLM or TEM)" Sampling’ (PCM)'*

18 Outdoor ND^ 30% No <0.001 f/cc 24 Outdoor ND^ 55% No 0.002 f/cc 28 Outdoor ND^ 15% No <0.001 f/cc

Common Areas in Lower Manhattan Building Area Asbestos in Dust SVF in Dust (PLM)* Aggressive Fibers in Air (PLM or TEM)" Sampling’ (PCM)'*

2 Common w 27% No 0.005 f/cc’ 7 Common ND*' 5% No 0.001 f/cc 14 Common ND* 5% No 0.003 f/cc 25 Common 5% No <0.001 f/cc 26 Common ND* 5% No 0.004 f/cc’ 28 Common 10% No 0.001 f/cc

Residential Units in l.ower Manhattan Building Area Asbestos in Dust SVF in Dust (PLM)* Aggressive Fibers in Air (PLM or TEM)" Sampling’ (PCM)'*

1 Residence 1 ND* 20% No 0.006 f/cc’ 1 Residence 2 20% Yes <0.001 f/cc 2 Residence 1 ND* 25% No <0.001 f/cc 2 Residence 2 ND* 20% Yes 0.002 f/cc 6 Residence 1 ND* 15% Yes <0.001 f/cc 6 Residence 2 ND* 15% Yes <0.001 f/cc 7 Residence 2 ND* 5% No <0.001 f/cc 10 Residence 1 ND* 15% Yes 0.001 f/cc 10 Residence 2 ND* 10% Yes 0.001 f/cc 12 Residence 1 ND* 5% No 0.001 f/ec 12 Residence 2 5% Yes <0.001 f/cc 13 Residence 1 ND* 10% Yes 0.003 f/cc 15 Residence 2 ND* 5% Yes <0.001 f/cc 18 Residence 1 ND* 30% No 0.002 f/ec 18 Residence 2 35% No 0.002 f/cc 24 Residence 2 ND* 10% No 0.005 f/cc’ 25 Residence 1 1^ 5% No <0.001 f/cc 27 Residence 2 ND* 10% No <0.001 f/cc a. Value shown is highest of the reported polarized light microscopy (PLM) and transmission electron microscopy (TEM) results for this area. b. SVF = synthetic vitreous fibers. Measured by PLM analysis. c. Aggressive sampling refers to a technique used in s ome residential units where the vacuum exhaust (used for settled dust sample collection) was used to stir up the settled surface dust before the air sampling began. d. f/cc = the fibers in each cubic centimeter (cc) of air. This is calculated from the number of fibers seen on the air filter and the volume of air pulled through the filter measured in cubic centimeters. e. Scanning electron microscopy (SEM) and TEM results for these air samples are available and shown on Table 8. f. ND = not detected.

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