NYC-WTC_000228425

NYC 9/11 Public Portal Document Pace Analjfllcal Sarvices, Inc. 1700 Elm Street, Suite 200 aceAnalyticar REPORT OF: CHEMICAL ANALYSES Minneapolis, MN 55414 Phone: 612.607.1700 www.pacelabs.com Fax: 612.607.6444

PROJECT: PCDD/PCDF ANALYSES DATE; April 5, 2002

ISSUED TO: ATC Associates REPORT N0:02-1055017 Attn: Mr. Jim Cohn 104 East 25th Street, 10th Floor New York, NY 10010

INTRODUCTION

This report presents the results from the analyses performed on three samples that were submitted by a representative of ATC Associates. The samples were analyzed for the presence or absence of polychlorinated dibenzo-p-dioxins (PCDDs) and dibenzofurans (PCDFs) using a modified version of USEPA Method 8290 as described below.

SAMPLE IDENTIFICATION

Client ID Sample Type Date Received Pace ID

ATC-0308-M833-DX1 Wipe 03/12/02 103384780 ATC-0308-M833-DX2 Wipe 03/12/02 103384798 ATC-0308-M833-DX3 Wipe 03/12/02 103384806

METHODOLOGY

Sample Extraction

Each sample was spiked with ’’C,2-labeled PCDD/PCDF internal standards (Table 1) and extracted with toluene in a Soxhlet extractor. The extract was quantitatively transferred to a Kuderna-Danish concentrator, concentrated, and solvent exchanged to hexane. The hexane extract was then _ spiked with 2,3,7,8-TCDD-^^Cl4 enrichment efficiency standard (Table 1) and processed through the analyte enrichment procedures described below.

REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, Inc.

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