WTC - EPA - United States Environmental Protection Agency

Aug 17, 2005 - Ca, S, and Fe and use Adobe Photoshop or similar software to determine the area percent of gypsum and Ca-rich particles. Fe-rich particles ...
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Final Report on the World Trade Center (WTC) Dust Screening Method Study

August 17, 2005 Prepared By:

U.S. Environmental Protection Agency,

Office of Research and Development (ORD),

Research Triangle Park, NC and Washington, D.C.

and

U.S. Environmental Protection Agency, Region 2

New York, New York

The use of trade names does not imply endorsement and is for illustrative purposes only.

ACRONYMS:

ATSDR AVG COPC EPA EPIC ERT HEPA LI MMVF MQO ND NEIC NERL NJ NYCDOMH ORD PM PM2.5 QAPP SD SEM USGS WTC

Agency for Toxic Substances and Disease Registry Average Contaminant of Potential Concern U.S. Environmental Protection Agency Environmental Photographic Interpretation Center U.S. EPA’s Emergency Response Team High Efficiency Particulate Air Long Island Man Made Vitreous Fibers Measurement Quality Objective Non-Detect U.S. EPA’s National Enforcement Investigations Center U.S. EPA’s National Exposure Research Laboratory New Jersey New York City Department of Health and Mental Hygiene U.S. EPA’s Office of Research and Development Particulate Matter Particulate Matter Smaller than 2.5 microns Quality Assurance Project Plan Standard Deviation Scanning Electron Microscopy U.S. Geological Survey World Trade Center

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TABLE OF CONTENTS: EXECUTIVE SUMMARY ………………………………….………………………….....4 I. INTRODUCTION AND BACKGROUND …………...……………………..….……...5 II. METHOD DEVELOPMENT ………………………..…………………………...…....6 III. METHOD VALIDATION STUDY ……………………………………………...…...9 IV. RESULTS AND DISCUSSION ………………………………………………….….12 V. CONCLUSIONS ……………………………………………………………………...21 VI. REFERENCES …………………………………………………………………….…22 VII. CONTRIBUTORS …………………………………………………………………..22 VIII. ACKNOWLEDGEMENTS ………………………………………………………...23 IX. APPENDICES ……………………………………………………………………......24 A: Quality Assurance Project Plan (QAPP) for the World Trade Center Screening Method Study (Under Separate Cover) B: Data gathered by U.S. EPA NERL during method development C: Data gathered by U.S. EPA NERL post method development D: Analytical method/protocol used during study E: Report from USEPA contractor on Screening Method Study Results (including SEM calibration data) F: Statistical analysis and interpretation of test results

TABLES: TABLE 1: Average, Standard Deviation and Range of Results ……………………..…..14

FIGURES: FIGURE 1a: ORD-Modeled WTC Plume Dispersion ……..…………………………….7 FIGURE 1b: EPIC Analysis of Deposition Boundaries …………………………………8 FIGURE 2: USGS Spiking Material Results ……………………………….………..…11 FIGURE 3: 4 Albany Spiking Material Results …………………………………….…..12 FIGURE 4: Average Slag Wool in background and spiked samples …….....…..……....15 FIGURE 5: Average Slag Wool in background, spiked and impacted samples …..........16 FIGURE 6: Average of Elements of Concrete in background and spiked samples…......17 FIGURE 7: Average of Gypsum in background and spiked samples ………….........….18 FIGURE 8: Map of the origin of samples analyzed ………………………………….…19

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EXECUTIVE SUMMARY

The September 11, 2001 attack on the World Trade Center (WTC) covered a large area with dust and debris. To assist in determining if residual contamination exists in the indoor environment, the U.S. Environmental Protection Agency (EPA) initiated a study to sample indoor environments that may have been impacted by the WTC collapse. A critical component of this study is determining whether sampled dust originated from the collapse of the WTC or instead is urban dust originating from other sources. This report describes work performed to develop and validate a screening method for indoor dust that can be used to determine whether dust sampled is from the collapse of the World Trade Center towers. Dispersion models, monitoring, photos, interviews, and satellite data were reviewed to discern areas that were likely impacted by WTC emissions and those that were not (US EPA 2002; 2004). A total of