NYC-WTC_000220420

NYC 9/11 Public Portal Document 06/14/2002 00:14 FAI 2129434841 l^io MiBICNT BROU*>, JNC.-LONG :aU«f>tD <51S> 603-6271 03/15/02 12:32P P.00O

) ambient labs inc. 159 West 25th Street New York, NY 10001 ELAP #10865 I I REPORT OF AIR SAMPLE ANALYSIS 8V TRANSMISSION ELECTRON MICROSCOPY j

Project ID : oaiiSM Client Name: The Otto Gerdau Company, BAI Group Project Name; 80-82 Wall Strwt FwkllD: 211366-04

1 Sample 10: AEM690 09403 Data Received: 9/20/01 I Sample Descripton: 2nd Floor, Suite * 200. Copier/Fax Room I ) J

Filter Composition; MCE Porosity; 0.4S micron Fill Lot#: eX56 Filter Diameter: 25 mm Effective Alter Area : 386 mn? Air Volume: 1782 »r

Total Filter Area Analyzed : 0.0460 mm’

* Grid Openings : 6 Avg Grid Opening Area 0.0090 , Grid Lot#: 4083 Analytical Senaitivity; 0.0049 asbestos strucUcm^

Humber of Asbestos Number of Structure Types Structures; LENGTH FIBER CLUSTER MATRIX BUNDLE Chrysotile t 0 C.5 um < L < 5 um 0 0 0 0 Amphibole : 0 i L > 5 um 0 0 0 0

A: TOTAL CHRYSOTILE STRUCTURE COnCEN 1 RATION : LT ANYLSENS sVucture/cnP B: TOTAL AMPHIBOLE STUCTURE CONCENTRATION : LT ANYL SENS stniclure/erP C; TOTAL ASBESTOS STUCTURE (A+B) CONCENTRAhOin ; LTAn¥Lstrueiura/env

IOTAL ASBESTOS CONCENI KA I ION : ( in air ! LTANYUSENS structuitt/cn^ ON P1LT5R I LTANYLSENS structure/mm^

Micrograph lO # tor Reported Siructur*«; Nono Non*

Reported for Ambient Labs Inc. by;

Analysis Date. 9/20/01 1NNA NURIK Environmental Analyst - O««il««<l«*.NA-An*yc«d

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NYC-WTC_000220420