Draft memo forwarding thread, April 2002

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■D o c o CT o o' o ■D co o IV. Sampling Parameters 3. 00 92. O Parameter Sample Tvpe Indoor/Outdoor Rationale for Selection o o c 3 CD Asbestos breathing ht., I/O Known use in building construction, evidence of time-weighted presence in early air sampling and in settled dust, air known inhalation carcinogen Inhalable (< 1 OO(im)* breathing ht., I/O To determine relative amounts of each air fraction present thoracic (< 10pm)’, time-weighted, and to have each fraction analyzed for silica, gypsum, respirable (<4pm)’ air mica, fiberglass, and calcite to qualitatively respirable (<2.5pm) 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 eyes, nose, and throat (ENT) irritation Asbestos" dust I/O Determine if asbestos is present in dust gypsum, silica, imca, dust I/O Associated with building materials (concrete, fiberglass, calcite" drywall) and known to be irritating to ENT

’ 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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