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← Document results/DEP Box 33/1 NORTH END AVENUE Block: 16 Lot: 225 BIN: 1085502 4 River Terrace, 60 Vesey Street
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Fax cover sheet, Ambient Group Inc, Sep 2001

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Fax cover sheet from Ambient Group Inc dated Sep 24, 2001, regarding environmental services at North End Avenue.

NYC-WTC_000097823–000097825

Folder label: “1 NORTH END AVENUE Block: 16 Lot: 225 BIN: 1085502 4 River Terrace, 60 Vesey Street

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NYC 9/11 Public Portal Document

ambient group inc. NATIONAL HEADQUARTERS

Indoor environmental quality surveys 55 WEST 39,H STREET I2h FLOOR Water treatment consulting NEW YORK, NEW YORK io018 Asbestos & lead field services TEL:(ziz) 463-78iz Regulatory compliance programs FAX: (212) 463-9397 Air, water & soil analytical laboratories WEB: WWW.AMBIENTGROUP.COM

September 17, 2001

Mr. Elliot Zuckerman Cushman & Wakefield a/a/f Mercantile Exchange One North End Avenue New York, New York 10282

Re: One North End Avenue Ambient Project #211338

Dear Mr. Zuckermen:

The following is a summary of the indoor environmental quality survey that Ambient Group, Inc. performed on September 14th, 2001 at the above referenced location. The survey included sampling for levels of background gaseous parameters, airborne dust characterization and air sample collection for TEM analysis, as well as absence/presence of asbestos in settled dust.

Analysis of all indoor gaseous air quality parameters, which included carbon dioxide, carbon monoxide, and total volatile organic compounds groups I and group 11 revealed that all indoor readings were below OSHA, ACGIH, ASHRAE and other recommended industry guidelines and/or regulations.

Seven (7) air samples were collected from various locations on floors 3, 7, 10, 11, 13, 15 and lobby analyzed by transmission electron microscopy (TEM). for asbestos structures. The results of the analysis indicated that airborne asbestos levels at the time of testing were less than the analytical sensitivity of the instrument, as well as well below the EPA standard of 70 structures/mm2 and other recommended industry guidelines and/or regulations.

Seven (7) air samples were collected from various locations on floors 3, 7, 10, 11, 13, 15, and lobby and analyzed for dust characterization. The samples were composed primarily of fungal spores, skin fragments, gravel road dust, carbon particles, and cement dust. Although the concentrations of carbon particles, cement dust, skin fragments and fungal spores were slightly elevated, the levels detected should not pose any adverse health concerns to the building occupants.

GLEN COVE, NY MIAMI, FL CHICAGO, IL ORANGE, CA 516 609-0009 305 86o-oioi 312 527-5526 714 282-2525

NYC-WTC 000097824

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NYC-WTC_000097824Source: NYC Law Department, mirrored locally

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Chronology of clean-up precautions and air sampling results for buildings at North End Avenue and 60 Vesey Street following the September 11 attacks.

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