NYC-WTC_000232959

NYC 9/11 Public Portal Document

Table 9 Summary of Airborne Fibers at Locations Where Asbestos Was 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)'’

1 Outdoor <1% 22% No 0.001 f/cc

2'= Outdoor 1.3% 28% No 0.003 f/cc

5 Outdoor 3.4% 25% No 0.002 f/cc

7 Outdoor 1.7% 35% No <0.001 f/cc

15 Outdoor 1.9% 72% No <0.001 f/cc 27 Outdoor <1% 15% No <0.001 f/cc

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

4 Common <1% 15% No 0.001 f/cc

6 Common <1% 10% No <0.001 f/cc

10 Common 1.5% 20% No 0.002 f/cc

24 Common <1% 5% No 0.001 f/cc

27 Common <1% 10% No <0.001 f/cc

Residential Units in Lower Manhattan Building Area Asbestos in Dust SVF in Dust (PLM)*’ Aggressive Fibers in Air (PLM or TEM)" Sampling‘s (PCM)'’

4 Residence 1 <1% 2% Yes <0.001 f/cc

4 Residence 2 <1% 5% Yes 0.001 f/cc

5 Residence 1 <1% 10% Yes 0.002 f/cc

5 Residence 2 <1% 20% Yes <0.001 f/cc

9 Residence 1 <1% 2% Yes 0.001 f/cc

9 Residence 2 <1% 5% Yes 0.003 f/cc

11 Residence 1 <1% ND Yes <0.001 f/cc

11 Residence 2 1.5% ND Yes <0.001 f/cc

1.5 Residence 1 <1% ND Yes <0.001 f/cc

27 Residence 1 <1% 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 some residential units where the vacuum exhaust (used tor 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. Building 2 also had a co-located dust sample; values represent the highest measured result.

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NYC-WTC_000233028