Chain of Custody Form Instructions for WTC Building Sampling

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

Ontdoor Areas in Lower Manhattan Budding Area Asbestos in Dust SVF in Dust (PLM)’ Aggressive Fibers in Air (PLM or TEM)” Sampling® (PCM)"*

18 Outdoor 30% No <0.001 f/cc 24 Outdoor ND* 55% No 0.002 fi'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 ND* 27% No 0.005 W 7 Common ND* 5% No 0.001 fee 14 Common ND* 5% No 0.003 fi'cc 25 Common No <0.001 fi'cc 26 ComiiKin ND* 5% No 0.004 fi'cc® 28 Common ND* 10% No 0.001 fi'cc

Residential Units in Lower 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 fi'cc® 1 Residence 2 ND^ 20% ■Yes <0.001 fi'cc 2 Residence 1 ND 25% No <0.001 fi'cc 2 Residence 2 ND* 20% Yes 0.002 fi'cc 6 Residence 1 ND*' 15% Yes <0.001 fi'cc 6 Residence 2 15% Yes <0.001 fi'cc 7 Residence 2 ND* 5% No <0.001 fi'cc 10 Residence 1 15% Yes 0.001 fi'cc 10 Residence 2 ND* 10% Yes 12 Residence 1 ND* 5% No 0.001 fi'cc 12 Residence 2 nd’’ 5% Yes <0.001 fi'cc 13 Residence 1 ND 10% Yes 0.003 fi'cc 15 Residence 2 ND* 5% Yes <0.001 fi'cc 18 Residence 1 ND* 30% No 0.002 fi'cc 18 Residence 2 ND* 35% No 0.002 fi'cc 24 Residence 2 ND 10% No 0.005 fi'cc® Residence 1 ND* 5% No <0.001 fi'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 some 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.

61

NYC-WTC_000149645