Residential sampling protocol, World Trade Center, Oct 2001

NYC 9/11 Public Portal Document

iwtc residential plan oct18.wpd Page 8jj

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Indoor air sampling for asbestos will be conducted and analyzed using NIOSH method 7400. If an action level is exceeded subsequent filter analysis using NIOSH 7402 to determine if the fibers present are asbestos will be conducted. Respirable crystalline silica will be sampled and analyzed using NIOSH method 7500. Air sampling for inhalable, thoracic, and respirable size particles will be conducted using the lOM™ sampler. The relative amounts (percent weight) of each fi-action present will be determined. Each fi-action will be analyzed for silica, gypsum, mica, fiberglass, and calcite using X-ray diSraction (XRD) analysis, and for asbestos using PLM analysis (and TEM anafysis if PLM indicates <l%).

Indoor floor dust samples will be collected using EPA ERT SOP for household dust collection. As much dust as possible will be collected; the area vacuumed will be measured and reported. Samples will be analyzed for crystalline silica, gypsum, mica, fiberglass and calcite using XRD. I Asbestos will be analyzyed using PLM; if <1% if found, TEM analysis will be conducted. The pH of the dust will be tested using EPA SW846 Method 9045C.

2. Exterior

Outdoor air and settled dust sampling will occur in areas adjacent to the residential building being tested indoors. Sampling will occur concurrently with indoor sampling.

Ambient air sampling wiU be conducted at breathing height. Air sampling for asbestos will be conducted and anah zed using NIOSH method 7400. If an action level is exceeded subsequent filter analysis using NIOSH 7402 to determine the amount of asbestos fibers present will be conducted. Respirable crystalline silica will be sampled and analyzed using NIOSH method 7500. Air sampling for inhalable, thoracic, and respirable shie particles will be conducted using the lOM'^^ sampler. The relative amounts (percent weight) of each fraction present will be deteimined. Each fraction will be analyzed for silica, gypsum, mica, fiberglass, and calcite using X-ray diffiaction (XRD) analysis, and for asbestos using PLM analysis (and TEM analysis if PLM indicates <1%). Twelve-hour, continuous, real-time TSP, PMIO and PM 2.5 sampling will be conducted-again at breathing zone height.

Settled surface dust samples will be collected by scraping visible dust into a glass container. A minimum of 25-30 grams of sample is required. Samples will be analyzed for crystalline silica, gypsum, mica, fiberglass and calcite using XRD, and for asbestos using PLM analysis (and TEM analysis if PLM indicates <1%). The pH of the dust will be tested using EPA SW846 Method 9045C.

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