Chain of custody for air samples from 125 Water Street,

NYC 9/11 Public Portal Document

104 East 25th St.. 10th Fl • New York. New York 10010 www.atc-enviro.com 212.353.8280 Fax 212.353.8306

ATE S I N C A S S o C I

October 2, 2002

ATC Associates Inc. Street 104 East 25th New York, NY 10010

Attn: Mr. Ben Sallemi Re: Report of TEM Analysis

Dear Mr. Sallemi: n microscoPy (TEM) Foll owing are the of 8924 resultsf samples romt ours Group No 1 analysis of air

Client: D.E.P. 125 Cedar St., NY, NY Project Name: D.E.P. Clean-up, Location: Entire Building 10/02/02 Samples received: today confirm and document nsmitted These results will w rformeddatanstr your office. The analyses P October 30, 1987) to of the AHERA Final Rule (CFR with the methodology abatement sites. for clearance of on the attached the sample analyses may be found The results of document. function of air reported as Struct/cc are a volume Results , as such, not inritsifisent i ety and coll ected in the field a may be a are reproduced only laboratory. This report laboratory. permission of this not without prior ived our TEM has to note that for erecognized rec We are pleased is currently re9uired approval ~ro,~;ration from NVLAP, as analysis of TEM air samples for program. AHERA projects, and analyses These also were ate LAP uedeo the NY OATCEAssociates Inc . performed by TCt d/b/a to these Please contact me regarding any questions relating materials.

Very truly yours,

• Ph.D. Michael A. Gorycki, Microscopy Director of Electron

NYC-WTC 000129987