Chain of custody for air samples from 125 Water Street,

NYC 9/11 Public Portal Document ivu 1 1 104 East 25th St.,York York, New 10010 New www.atc-enviro.com 212.353.8280 Fax 212.353.8306

ATE S I N C A S S O C I

September 15, 2002

Inc. ATC Associates 104 East 25th10Oleet New York, NY 0 Burkhardt Attn: Mr. Fred TEM Analysis Re: Report of

Burkhardt: (TEM) Dear Mr. Nelectron microscopy of traTs 1 ctr n the results Following are samples from ou Group analysis of air

Client: D•E•P Clean-up, 125 Cedar St., NY, NY Project Name: D.E.P. to Location: 1st Floor Samples received: 09/14/02 heddatainstrismitted today mance will confirm and document 1987) These results analyses were perfo The Final Rule (CFR October 30, • to your office. of the AHERA with the methodology abatement sites• of for clearance be found on the attached The results of the sample analyses may document. of air volume Struct/cc are a function this as as such, not verifiable by and Results reported are, in the field be reproduced only in its entirety collected may laboratory. laboratory. This reppermission of this prior ful not without that our TEM lab has cog ni d received to note approval We are pleased from NVLAP, as is currently required for were Y~d~tation samples mpe for AHERA projects, and also app analysis of TEM air program. These analyses Inc. under the NY State DOH ATC d/b/a ATC Associates performed by relating to these Please contact me regarding any questions materials.

yours, Very truly

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

NYC-WTC 000129733