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Minerals and fibers analysis report, Bldg 26 Nov 2001

Machine-extracted title · confidence 95%

Report enclosure detailing air and settled dust sampling results for Building 26, including PM size fraction analysis.

NYC-WTC_000176156–000176159
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NYC 9/11 Public Portal Document

Table 2a Fibers in Air for Building 26 and the upper Manhattan Comparison Area (fibers per cubic centimeter of air)

Building 26 Comparison Area* Fibers in Air Common Outdoor Residence Residence Common Outdoor Residences Area #1 #2 Area Total Fibers 0.004 0.001 0.012 <0.001 0.002 0.001 0.003 (PCM) Asbestos <0.001 NA <0.001 NA NA NA NA (TEM) Fiberglass <0.00004 NA <0.00004 NA 0.00004 0.00004 0.00009 (SEM)

*Results are maximum values found in the comparison area PCM = phase contrast microscopy TEM = transmission electron microscopy SEM = scanning electron microscopy NA = not analyzed

Table 2b Fibers in Settled Dust for Building 26 and the upper Manhattan Comparison Area (percent of sample containing fibers)

Building 26 Comparison Area* Fibers Common Outdoor Residence Residence Common Outdoor Residences In Dust Area #1 #2 Area Asbestos ND NS ND ND ND NS ND (PLM) Asbestos ND NS ND ND ND NS ND (TEM) Fiberglass 5 NS ND ND ND NS ND (PLM)

*Results are maximum values found in the comparison area PLM = polarized light microscopy TEM = transmission electron microscopy NS = not sampled ND = not detected

CONFIDENTIAL, CITY_21MC100_003434276 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176159

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NYC-WTC_000176159Source: NYC Law Department, mirrored locally

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