Ambient Dust Sampling Protocol Near WTC, Oct 2001

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'2 o o ****DRAFT Version 10, October 29, 2001**** ■D c CT o' tn ■D tAi o ro IV. Sampling Parameters: 3. o> 03 Parameter Sample Type Indoor/Outdoor Rationale for Selection Asbestos breathing ht., VO known use in building construction, evidence of o o time-weighted presence in early air sampling and in settled dust, o c air known inhalation carcinogen 3 CD

on hold?Total Suspended breathing ht.. O Characterize amount of airborne dust that is particulates Continuous, real­ inhalable 100 pm aerodynamic diameter) time, air

PMlOand PM2.5 breathing ht.. O Characterize the amount of airborne dust that is Continuous, real­ respirable time, air

Inhalable (< 100pm)* breathing ht., I/O To determine relative amounts of each fraction present thoracic (<10pm)* time-weighted, and to have each fraction analyzed for silica, gypsum, respirable (<2.5pm)* air mica, fiberglass, and calcite to qualitatively determine potential hazards.

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

pH** dust VO Concrete has a high pH, if dust has a high pH, it may be contributing to reported symptoms of ENT irritation

Asbestos** dust VO Determine if asbestos is present in dust

gypsum,silica, mica, dust VO Associated with building materials (concrete, fiberglass, calcite** drywall) and known to be irritating to ENT

magnesium dust VO May act as a tracer for WTC-related dust, levels found in metals analysis of settled dust from 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 problems. Results will assist in providing information/recommendations to the public (e.g., what is contributing to irritation, how to reduce exposures)

** to assist in characterizing dust that can become airborne (re-entrainment of settled dust that may be the source of continuing air contamination), and to make recommendations for outdoor dust remediation

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