NYC-WTC_000226877

NYC 9/11 Public Portal Document

Pace Analytical Services, 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: December 20, 2001

ISSUED TO: ATC Associates REPORT NO: 01-1051682 Attn: Mr. Jim Cohn 104 East 25th Street, 10th Floor 'I New York, NY 10010

1 INTRODUCTION This report presents the results from the analyses performed on four samples which were 5 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 lD Sample Type Date Received Pace ID

8 ATC-1203-STY-DX1 Wipe 12/04/01 103183083 ATC-1203-STY-DX2 Wipe 12/04/01 103183091 ATC-1203-STY-DX3 Wipe 12/04/01 103183117 3 ATC-1203-STY-DX4 Wipe 12/04/01 103183125

METHODOLOGY

Sample Extraction

Each sample was spiked with ’^Cij-labeled PCDD/PCDF internal standards (Table 1) and extracted J 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-2^Cl4 enrichment efficiency standard (Table 1) and processed through the analyte enrichment procedures described below.

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i REPORT OF LABORATORY ANALYSIS This report shall not be reproduced, except in full, without the written consent of Pace Analytical Services, Inc. 1 CITY_21MC100_000490777 NYC-WTC_000226878