Residential sampling protocol, World Trade Center, Oct 2001

NYC 9/11 Public Portal Document

|wlc residential plan octlS.wpd Pages-)

IV. Sampling Parameters: Parameter Sample Type Indoor/Outdoor Rationale for Selection Asbestos breathing ht., I/O knoivn u.se in building construction, evidence of IJ time-weighted presence in early air sampling and in settled dust, air known inhalation carcinogen 5

Total Suspended breathing ht.. o Characterize amount of airborne dust that is particulates Continuous, real­ inhalable (<100 (im aerodynamic diameter) time, air

PMlOand PM2.5 breathing ht.. Continuous, real­ time, air O Characterize the amount of airborne dust that is respirable I I Inhalable (<100p.m)’ breathing ht., I/O To determine relative amounts of each fraction present thoracic (<10(im)' time-weighted, and to have each fraction analyzed for silica, gypsum, respirable (<4pni)’ air asbestos, mica, fiberglass, and calcite to qualitatively detcnnine potential hazards.

Respirable breathing ht., I/O Known component of concrete, evidence of crystalline silica time-weighted, presence in some settled dust samples, known air inhalation carcinogen.

pH" dust I/O Concrete has a high pH, if dust has a high pH, it may be contributing to reported symptoms of ENT irritation

Asbestos” dust I/O Determine if asbestos is present in dust

g^sum,silica, mica, dust I/O Associated with building materials (concrete, fiberglass, calcite” drywall) and known to be irritating to ENT

magnesium dust I/O May act as a tracer for WTC-related dust, levels found in metals analysis of settled dust Irom 16,000-29,000 ppm ■ results will be used to better understand the potential for ENT and respiratory irritation, and possibly for determining the possibility of acute/chronic health n I 5 J f S n o o I o 1—1

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