Ambient Dust Sampling Protocol Near WTC, Oct 2001

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■D o c o IV. Sampling Parameters: CT o rarameter Sample Type Indoor/Outdoor Rationale for Selection o' cn breathing ht., VO known use in building construction, evidence of ■D Ca5 Asbestos O ro tn time-weighted presence in early air sampling and in settled dust, 3. o air known inhalation carcinogen 91 O o o Total Suspended breathing ht.. o Characterize amount of airborne dust that is c particulates Continuous, real­ inhalable (<100 pm aerodynamic diameter) 3 CD time, air

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

Inhalable (< 100 pm)’ breathing ht., VO To determine relative amounts of each fraction present thoracic (<10pm)’ time-weighted, and to have each fraction analyzed for silica, gypsum, respirable (<4pm)’ air asbestos, 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

Delete? gypsum, 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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