Asbestos air monitoring summary, Sept 28, 2001

NYC 9/11 Public Portal Document

ATC environmental, INC. APPROVED NY STATE DOH ELAP # 10879 r? 104 East 25th street ACCREDITED NVLAP Lab Code # 1187 New York, NY 10010 Summary of TEM Results ATC Associates Inc. DATE : 09/28/^ 104 East 25th Street New York, NY 10010 Mr. Scott Graber

Project/Site Identification: 4 0 Rector Street, NY, NY Floors 5-7 CONCLUSION:

STATISTICAL SUMMARY 1) Inside Samples Asbestos Concentration TEM# Project # Volume{1} S/mm*2 S/.cc nQm/m*3 5573- 59619 03 1250 0.0 0.0046 * 5573- 59620 04 1250 14.8 0.0046 5573- 59621 05 1250 14.8 0.0046 5573- 59622 06 1250 0.0 0.0046 * 5573- 59623 07 1250 0.0 0.0046 * 5573- 59624 08 1250 0.0 0.0046 * 5573- 59625 14 1300 0.0 0.0044 * 5573- 59626 15 1300 0.0 0.0044 * 5573- 59627 16 1300 0.0 0.0044 * 5573- 59628 17 1300 89.0 0.0263 5573- 59629 18 1310 29.7 0.0087 Average^ 13.5 0,0069 2) Outside Samples Asbestos Concentration TEM# Project # Volume(1) S/mm^2 S/cc ncnn/m*3 Average^ N/A N/A 3) Blanks Asbestos Concentration TEM# Project # S/Tnm'^2 S/cc ncrm/m 3 5573- 59617 01 Not Analyzed 5573- 59618 02 Not Analyzed Average® N/A N/A N/A 4) Value of T - Statistic : N/A U.J None detected; concentration equivalent to analytical sensitivity assigned.

This test report relates only to the specific items cited in the analysis. The analysis was carried out according to the approved TEM method. The laboratory is in compliance with the quality specified for the method.

This report must not be used by the client to claim product endorsement by NVLAP or any agency of the U.S. Government.

Analyzed by: Michael A. Gorycki, Ph.D. Roman Peysakhov Director of Electron Microscopy

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NYC-WTC_000174871