Document fragment from DEP Box 53 regarding West Street

NYC 9/11 Public Portal Document

Accredited Environmental Technologies, inc. U April 15, 2002

Ms. Carolyn Bailey ■ CCMH Fin Center LLC c% Claris Services Corporation ■ 6903 Rockledge Drive, Suite 920 Bethesda, MA 20817

■ RE: New York Financial Center Marriott, 85 West Street, New York, New York

Dear Ms. Bailey:

■ Attached are the laboratory results for airborne asbestos samples collected at the above referenced location. These samples were collected and analyzed by Accredited Environmental Technologies, Inc. for ■ comparison with the clearance standards for airborne asbestos established by the New York City Department of Environmental Protection Asbestos Control Program (Title 15, Chapter 1). Sample collection occurred under normal occupancy conditions on April 9, 2002. All samples were collected with high volume sampling pumps with sample durations of approximately five hours and are considered basement, 1g and 2"' floors. representative of background fiber concentrations throughout the

Results indicate that fiber concentrations in the background samples were primarily below 0.01 F/cc, a level considered acceptable for occupancy according to the Department of Environmental Protection • standards, with the exception of one sample from the basement which contained an elevated number of fibers. The basement sample was reanalyzed by Transmission Electron Microscopy which verified that none of the fibers were asbestos. The reported concentration for the reanalyzed sample was below 70 ■ S/mm2, a level considered acceptable according to DEP standards.

■ All samples were initially analyzed by Phase Contrast Microscopy per NIOSH Method 7400 for asbestos fibers. This method measures total airborne fibers and does not distinguish fiber morphology. All structures with a length to diameter ratio of 3 to 1 or greater and a length greater than 5 microns, are • considered to be fibers and are counted as such. The sample that yielded the elevated result by PCM was reanalyzed by Transmission Electron Microscopy in accordance with EPA requirements as stipulated in 40 CFR 763.90(i) (3) and (4). This method is capable of distinguishing asbestos fibers from other • non-asbestiform mineral fibers. TEM analysis was performed by EMSL Analytical, Inc. of Piscataway, NJ. If you have any questions or require additional information, please do not hesitate to contact our office. • Sincerely,

• Eric Houseknecht Vice President EH/bg

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■ 335 High Street • Metuchen, NJ 08840 • (732) 321-0666 • FAX: (732) 321-3666

NYC-WTC 000131225