NYC-WTC_000162222
EPA staff distributed an environmental laboratory report to federal and city agencies on May 15, 2002.
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EPA interim final report on WTC background study, April 2003
Machine-extracted title · confidence 100%Interim final report from EPA Region 2 detailing a background study of environmental conditions at the World Trade Center site.
NYC-WTC_000145869–000146029Folder label: “INTERIM FINAL April 2003”
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NYC 9/11 Public Portal Document
ambient levels of MMVFs in soil or sediment. The literature search also has not located data on MMVF loading in residences.
7.2.5 Comparison of Lead Concentrations in the Ambient Air The WTC Background Study reported a mean concentration of 0.027 pg/m’. For the 46 samples collected. No studies on backgroimd lead concentration in residential dwellings were identified in the literature search. ATSDR (1999) reported that lead levels in the ambient air vary widely but usually decrease with increasing distance (both vertical and horizontal) fi-om emission sources. The composite urban air measurement of lead for 1991 was 0.08 pg/m^ (EPA 1996). ATSDR (1999) estimated urban airborne levels for the years 1994-1995 to be 0.04 pg/m\ Indoor air lead levels are generally 0.3-0.8 times lower than the corresponding outdoor levels, with an average ratio of 0.5 (ATSDR 1999).
From the historical information reported above, a rough estimate of indoor airborne lead concentration in urban areas can be made by multiplying the composite ambient air concentration (0.04 pg/m’) by 0.5 (average value of indoor/outdoor concentrations) to give a product of 0.02 pg/m^. This value is consistent with the mean concentration 0.027 pg/m’ found in the WTC Background Study.
7.2.6 Comparison of Settled Lead Dust Measurements The WTC Background Study recorded lead measurements in settled dust by concentration (mass per unit mass) and load (mass per unit area). In addition, the load measurements were obtained by wipes for hard surfaces and microvacuum for porous surfaces. The following mean measurements were reported for residential dwellings and common spaces:
Sample Type Number of Samples Mean bulk dust 9 119mg/kg microvacuum 162 1.51 pg/tf wipe (all samples) 114 1.75 pg/tf wipe (all uncaipeted floors) 34 3.91 pg/tf wipe (uncarpeted residential floors) 25 1.82 pg/tf
Unlike the other contaminants included in the WTC Background Study, settled dust lead levels in residential dwellings have been extensively studied. The study by Lanphear et al. (1998) focused on the relationship between lead-contaminated house dust and children’s blood lead levels. This Study evaluated pooled epidemiologic data from many different communities, some of them with significant sources of lead contamination from activities such as mining sand smelting. Consequently, reported lead levels are likely to be biased high. Another WORLD TRADE CENTER BACKGROUND STUDY 36
NYC-WTC_000145911
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NYC-WTC_000145911Source: NYC Law Department, mirrored locally
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NYC-WTC_000148952
Table listing volatile organic compound (VOC) sampling sites and dates outside of Ground Zero from September 2001 to January 2002.
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Instructions and sections for collecting sample location data from a specific building interior.
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Forwarded spreadsheet compiling residential asbestos sampling results collected in November-December 2001, including Building 11 reoccupancy assessment.
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Draft compilation of asbestos air samples collected from residential areas November-December 2001 by NYC DOH and ATSDR.
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Draft spreadsheet of asbestos sampling results from residential locations collected November-December 2001, circulated for review.
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Series of emails forwarding a draft memo between DEP staff members for review and finalization.
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Draft fact sheet from DOH and DEP addressing tenant concerns regarding asbestos fibers at 105 Duane Street.
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Transmission of revised asbestos sampling results for residential samples collected November-December 2001.
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Internal tracking document for managing reports, comments, and actions related to environmental compliance cases.
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Correspondence from NYC Corporation Counsel providing comments on excerpts of a draft EPA evaluation report regarding the WTC response.
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