NYC-WTC_000196150

NYC 9/11 Public Portal Document

****DI{AFT**** rV. Sampling Parameters: Parameter Sample Type Indoor/Outdoor Rationale for Selection 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

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

PM10andPM2.5 breathing ht.. 0 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 (<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 I/O Determine if asbestos is present in dust gypsum,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 from 16,000-29,000 ppm o * results will be used to better understand the potential for ENT and respiratory irritation, and possibly for determining the possibility of acute/chronic health H problems. Results will assist in providing information/recommendations to the public (e.g., what is contributing to irritation, how to reduce exposures) K I

I o ** 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 o Io o co Page 4 of o co co co CH ho

NYC-WTC_000196153