NYC-WTC_000232959

NYC 9/11 Public Portal Document

Table 3 Number of Buildings and Areas Within Buildings Sampled for Settled Surface Dust: Analyzed for Asbestos by PLM" and TEM”, SVF® by PLM, and Minerals by XRD” Due to available sample size and analytical objectives, some samples were not analyzed by each method.

Lower Manhattan Above 59th Street

Buildings 29 4

Residential Units 57 5

Common Areas 26 3

Outdoors 14 0

Table 4 Number of Buildings and Areas Within Buildings Sampled for Fibers in Air: Analyzed for Total Fibers by PCM®, Asbestos by TEM, and SVF by SEM^ Lower Manhattan Above 59th Street

Total Fibers Asbestos SVF (SEM) Total Fibers Asbestos SVF (SEM) (PCM) (TEM) (PCM) (TEM)

Buildings 30 5 4 4 0 4

Residential Units 59 3 3 5 0 5

Common Areas 29 3 2 3 0 1

Outdoors 29 0 0 3 0 3

Table 5 Number of Locations Sampled for Minerals in Airborne Dust, Analyzed by XRD for Minerals Lower Manhattan Above 59th Street PMIOO PMIO PM4 PM2.5 PMIOO PMIO PM4 PM2.5

Buildings 26 28 30 10 3 4 4 3 Residential 47 52 57 18 3 5 5 2 Units Common 9 9 26 27 29 8 2 3 Areas 26 26 29 8 9 3 3 9 Outdoors Notes: a. PLM = polarized light microscopy b. TEM = transmission electron microscopy c. SVF = synthetic vitreous fibers d. XRD = x-ray diffraction e. PCM = phase contrast microscopy f. SEM = scanning electron microscopy Settled surface dust and air samples could not always be obtained together from the same sampling location.

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