Chain of Custody: DEP Cleanup Samples, October 24, 2002

NYC 9/11 Public Portal Document

PSC Services Analytiques

All work recorded herein has been done in accordance with normal professional standards using accepted testing methodologies, quality assurance and quality control procedures except where otherwise agreed to by the client and testing company in writing. Any and all use of these test results shall be limited to the actual cost of the pertinent analysis done. There is no other warranty expressed or implied . Your samples will be retained at PSC Analytical Services for a period of six weeks from date of reception or as per contract. This report may not be reproduced except in its entirety, without the written authorization of PSC Analytical Services. Reference material results are under control statistically unless otherwise specified (RM). The enclosed guidelines and criterias are provided for information purposes only. In case of desparity between the guidelines and criterias provided and the official version, these are the valid one

Organic analyses are not corrected for extraction recovery standards except for PCDD/F and PCB's (congeners). Batch and run dates for subcontracted analyses are reported only when available; if not, the date of reception of the certificate by fax is reported. Methods used by PSC Analytical Services are based upon those found in 'Standard Methods for the Examination of Water and Wastewater', Nineteenth Edition. Other methods are based on the principles of MENV or EPA methodologies. See the confirmation analysis report in the appendix at the end of this report for the list of the methods used, and the list of parameters analyzed by subcontracting laboratories. Please contact your project manager for additionnals informations.

NOTES: - = not analyzed <= less than Reported Detection Limit (RDL) NA = Not Applicable RDL = Reported Detection Limit Solids data is based on dry weight (unless otherwise specified).

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Certificate No:2J0631 file # =R02090971 revised TEO final Report.xls nh Page 1 of I Revision No. 0

NYC-WTC 000130135