Transmission of revised asbestos sampling results for residential samples collected November-December 2001.
NYC-WTC_000164784–000164829
OCR status: ok · source: pdftotext
NYC 9/11 Public Portal Document
Indoor floor dust samples will be collected using the 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, and calcite using XRD analysis. Asbestos and fibrous glass will be analyzed using New York State Method 198.1 (polarized light microscopy [PLM]); if <1% asbestos is found. New York State Method 198.4 (transmission electron microscopy [TEM]) analysis will be conducted. The pH of the dust will be tested using EPA SW846 Method 9045C.
2. Outdoor
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 will be conducted at breathing height. Air sampling for asbestos will be conducted and analyzed using NIOSH methods 7400 and 7402. Respirable crystalline silica will be sampled and analyzed using NIOSH method 7500. Air sampling for inhalable and thoracic size particles will be conducted using EPA method IP-IOA. The respirable silica sample will be used to analyze the respirable fraction of the dust. The relative amounts (percent weight) of each fraction present will be determined. Each fraction will be analyzed for silica, gypsum, mica, and calcite using XRD analysis, and for fibrous glass using SEM.
Settled surface dust samples will be collected by scooping visible dust into a glass container. A minimum of 25-30 grams of sample is required. The area of the surface sampled (e.g., 100 cm’) will be measured and documented. Samples will be analyzed for crystalline silica, gypsum, mica, and calcite using XRD analysis, and for asbestos and fibrous glass using New York State method 198.1 (PLM). If PLM shows less than <1% asbestos. New York State Method 198.4 (transmission electron microscopy [TEM]) analysis will be conducted. The pH of the dust will be tested using EPA SW846 Method 9045C.
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NYC-WTC_000164791
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NYC-WTC_000164732
Draft spreadsheet of asbestos sampling results from residential locations collected November-December 2001, circulated for review.
24 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.999
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000164960
Draft compilation of asbestos air samples collected from residential areas November-December 2001 by NYC DOH and ATSDR.
24 shared non-person entities · 1 shared topics · Same agency, volume and box · similarity 0.998
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000139712
Series of emails forwarding a draft memo between DEP staff members for review and finalization.
24 shared non-person entities · 1 shared topics · similarity 0.999
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000139656
Forwarded spreadsheet compiling residential asbestos sampling results collected in November-December 2001, including Building 11 reoccupancy assessment.
23 shared non-person entities · 1 shared topics · similarity 0.998
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000153220
Draft protocol outlining objectives and locations for assessing airborne and settled dust exposures in residential areas.
16 shared non-person entities · 1 shared topics · similarity 0.989
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000153258
Draft protocol for assessing airborne and settled dust exposures in residential areas following the World Trade Center collapse.
17 shared non-person entities · 1 shared topics · similarity 0.989
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000149537
Instructions and sections for collecting sample location data from a specific building interior.
24 shared non-person entities · similarity 0.986
machine-extracted · confidence unavailable · Check page ↗17 shared non-person entities · 1 shared topics · similarity 0.982
machine-extracted · confidence unavailable · Check page ↗16 shared non-person entities · 1 shared topics · similarity 0.979
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000152814
Draft document outlining concepts and priorities for sampling buildings near the WTC to identify worst-case contamination scenarios.
15 shared non-person entities · 1 shared topics · similarity 0.979
machine-extracted · confidence unavailable · Check page ↗16 shared non-person entities · 1 shared topics · similarity 0.978
machine-extracted · confidence unavailable · Check page ↗NYC-WTC_000153247
Draft protocol for assessing airborne and settled dust exposures in residential areas following the World Trade Center collapse.
15 shared non-person entities · 1 shared topics · similarity 0.978
machine-extracted · confidence unavailable · Check page ↗Similar subjects in other documents. Similarity does not establish the same event, measurement or conclusion.
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