Chain of Custody Form Instructions for WTC Building Sampling

NYC 9/11 Public Portal Document

Table 6 Summary of Locations With Asbestos or Synthetic Vitreous Fibers (SVF) in Settled Surface Dust Sampling locations that had either asbestos in the dust by PLM or TEM analysis or SVF in the settled surface dust by PLM analysis. Ranges of asbestos and SVF values for each type of location are included._______________________ Number of Range of Number of Range of Sartqtling Locations with Asbestos Found* Locations with SVF Found Locations: Total Number of Asbestos in SVF in Settled Surface Dust Lower Locations Sampled* Settled Surface (% of Manhattan Dust locations (% of locations detected)** detected)’’ Asbestos (PLM) = 14 Outdoor Asbestos (TEM) = 12 6 <1%3.4 % 11 l%-72% SVF(PLM) = 14 (43%) (79%)

Asbestos (PLM) =26 Common Asbestos (TEM) =25 5 14 5%-27% SVF(PLM) = 26 (19%) (54%)

Asbestos (PLM) =57 Residential Asbestos (TEM) =52 10 26 2%-35% *■ SVFtPLM) = 57 (18%) (46%)

Asbestos (PLM) =29 Whole Asbestos (TEM) =29 12 <l%-3.4% 21 2%-72% Buildir^ SVF (PLM) = 29 (41%) (72%)

Number of Range of Number of Range of Sampling Locations With Asbestos Found** Locations SVF Found • Locations: Total Number of Asbestos in With SVF in Comparison Locations Sampled Settled Surface Settled Surface Dust Buildings Dust (%of (% of locations locations ^tected)” detected)** Asbestos (PLM) = 3 Common Asbestos (TEM) =3 0 None Detected 0 None Detected SVF (PLM) =3 by PLM or TEM (0%) by PLM (0%) Asbestos (PLM) =5 Residential Asbestos (TEM) =4 0 None Detected 0 None Detected SVF (PLM) =5 (0%) by PLM or TEM (0%) by PLM

Notes: a. All dust samples were initially analyzed by polarized light microscopy (PLM). Transmission electron microscopy (TEM) analysis was performed to confirm the absence ofasbestos if not detected by PLM analysis. b. The number of locations containing asbestos in dust reflects locations with asbestos detected by either PLM or TEM (reported as <1 % or more). The percentage of locations with asbestos detected is calculated from the total number of dust samples. 1 c. The range represents the highest value detected at a location (PLM oT TEM). d. The percentage of locations with synthetic vitreous fibers (SVF) detec'i'sd is calculated from the number of SVF PLM samples. e. Some locations had an additional co-located sample obtained, the range shown considers the highest measured value for each sampling location. *) f. One residential unit had an extra settled surface dust sample (taken from a wip)dow sill), which contained 40% SVF by PLM.

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