2001 M. Gilsenan

z z o o i 1^ co

■D o IV. Sampling Parameters; c o CT o Parameter Sample Type Indoor/Outdoor Rationale for Selection o' CT) Asbestos breathing ht., VO known use in building construction, evidence of "0 time-weighted presence in early air sampling and in settled dust, o KJ air known inhalation carcinogen 03

O o Total Suspended breathing ht.. o Characterize amount of airborne dust that is oc particulates Continuous, real­ inhalable (,<100 pm aerodynamic diameter) 3 CD time, air 3

PM10andPM2.5 breathing ht.. o Characterize the amoimt 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 (<4pm)* air asbestos, mica, fiberglass, and calcite to qualitatively determine 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 VO Determine if asbestos is present in dust

Delete? gypsum, mica, dust I/O 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 imderstand the potential for ENT and respiratory irritetion, and possibly for determining the possibility of acute/chronic health problems. Results will assist in providing information/reconunendations 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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