EPA letter to Congress regarding 114 Liberty cleanup, September 2003

NYC 9/11 Public Portal Document

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” The EPA background study, op. cit., EPA (April, 2003), did not provide the actual values for the 11 samples where it did detect a-quartz. Table 6-4 of this report only indicates that for one sample, the value was 259 gg/m’, and that for the 34 out of 46 samples where quartz was not detected, EPA assumed that the value was % the detection limit, which would be 2 gg/m^. EPA provided the mean concentration for all these values, however. This enabled a back-calculation of the mean of the samples without the outlier.

Note that EPA stated in its background study that eliminating the high outlier of259 gg/m^ was appropriate, and provided an Upper Confidence Limit for a-quartz at 7.8 gg/m’ in Table 8-1 that did not use the hi^ outlier.

“ USEPA ORD, NCEA (October, 2002) draft Exposure and Human Health Evaluation of Airborne Pollution from the World Trade Center Disaster, EPA Publication No. NCEA - W -1395 EPA/600ZP-2/002A External Review Draft, http.7/oaspub.epa.gov/eims/eimscomm.getfile?p_download_id=36387.

Jenkins, C. (July 4,2003) Comments on the EPA Office of Inspector General’s 1/27/03 interim report titled: “EPA’s Response to the World Trade Center Towers Collapse” A DOCUMENTARY BASIS FOR LITIGATION. op. cit.

US EPA et al. (May, 2003) World Trade Center Indoor Environment Assessment: Selecting Contaminants of Potential Concern and Setting Health-Based Benchmarks, Prepared by the Contaminants of Potential Concern (COPC) Committee of the World Trade Center Indoor Air Task Force Working Group. See p. 15, http://www.tera.org/peer/WTC/COPC%20-%20Benchniark%20Report%20with%20appendices.pdf

US EPA (October, 2002) DRAFT: Exposure and Human Health Evaluation of Airborne Pollution from the World Trade Center Disaster National Center for Environmental Assessment Office of Research and Development U.S. Environmental Protection Agency, http://oaspub.epa,gov/eims/eimscomm.getfile?p_download_id=36387

EPA (May, 2003) Final WTC Residential Confirmation Residential Confirmation Cleaning Study Cleaning Study, at. Seep. 15

“ NIOSH. NIOSH Carcinogen List. See NIOSH website at http://www.cdc.gov/niosh/npotocca.html

“ NIOSH (May 20,2002) NIOSH UPDATE. NIOSH REPORT ON RESPIRABLE CRYSTALLINE SILICA REVIEWS HEALTH EFFECTS DATA DISCUSSES RESEARCH NEEDS http://www.cdc.gov/niosh/cTysilup.html

NIOSH (1974) Criteria Documents Criteria for a Recommended Standard: Occupational Exposure to Ciystalline Silica, DHHS (NIOSH) Publication No. 75-120, http://www.cdc.gov/niosh/75-120.htnil

“ NIOSH (2002) HAZARD REVIEW Health Effects of Occupational Exposure to Respirable Crystalline Silica http://www.cdc.gOv/niosh/02-129I.html

NTP (2002) 10* Report on Carcinogens, http://ehp.niehs.nih.gov/roc/toclO.html.

“ The conclusions and opinions are those of fire author and do not necessarily reflect those of the U.S. Environmental Protection Agency.

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