NYC-WTC_000210392

NYC 9/11 Public Portal Document

02/13/2002 12:19 FAX 2129444618 AMBIENT GROUP ® 002

NA’noN/u. HEAnoiMxnsxs ambient group me. 55 WEST j9„ sTMirr Indoor environmental quality surveys IlT.i FLOOR Water treatment consulting NEW yORX. NEW TORC lOOjS Asbestos a lead field services TEU ctii) 944'4615 Ka Regulatory compliance programs FAX: (2121 944-4618 Aif, water & soil analytical laboratories web: WWW.AMFIHNTaitOUF.COM

February 12, 2002

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

Re: One North End Avenue Ambient Project # 211338

Dear Mr, Zuckerman:

The following is a summary of the indoor environmental quality survey daat Ambient Group, Inc. performed on February 7, 2002 at One North End Avenue, lie survey included sampling for airborne metala (including silica scan), polynuclear aromatic hydrocarbons and airborne asbe^os structures by TEM.

Four (4) air samples were collected firom floors 3, 7, 12 and from the lobby and 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 ths instrument, which is well below the EPA standard of 70 structures/mm^ as well as other recommended industry guidelines and/or regulations.

Four (4) air samples were collected from floors 3, 7, 12 and from the lobby and analyzed for metals in air (including silica). All measured metals revealed levels well below their respective OSHA PELs and NIOSH RELs. Levels of cristobalite and quartz detected in the silica scan were also below the NTOSH REL of 0.05 mg/m^

Four (4) air samples were collected from floors 3, 7, 12 and from the lobby and analyzed for polynuclear aromatic hydrocarbons in air. Analysis of all four (4) samples collected revealed that the levels of the individual compounds were below the OSHA Permissible Exposure Limits and NTOSH REL guidelines.

Please refer to the attached laboratory data sheets for further details. Should you have any questions regarding this information, please feel fixe to call me.

Sincerely, Signed for Ambient Group, Inc. by;

Vice President ffw r

JLZnt Anachmenta

CLBN COvtf NT mtaML fl cmcAGo. IL CORONA, CA <16 609-0009 jo; S6&-UX01 pi 5=7-55-0 909 272-4750 211338

02/13/02 WED 13:16 (TX/RX NO 93011

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NYC-WTC_000210392