Laboratory report cover page, Pace Analytical Services, Aug 2002

NYC 9/11 Public Portal Document

Pace Analytical Services, Inc. 1700 Elm Street, Suite 200 weAnalyticar www.pacelabs.com REPORT OF: CHEMICAL ANALYSES Minneapolis, MN 55414 Phone: 612.807.1700 Fax: 612.607.6444

PROJECT: PCDD/PCDF ANALYSES DATE: October 17, 2002

ISSUED TO: ATC Associates REPORT N0:02-1061865 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 four 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. 1

SAMPLE IDENTIFICATION

Client ID Sample Type Date Received Pace ID

ATC-0826-130M-DX1 Wipe 08/28/02 103810149 ATC-0826-130M-DX2 Wipe 08/28/02 103810156 ATC-0826-130M-DX3 Wipe 08/28/02 103810164 ATC-0826-130M-DX4 Wipe 08/28/02 103810172

DISCUSSION

The recoveries of the isotopically-labeled PCDD/PCDF internal standards in the sample extracts ranged from 46-110%. All of the labeled internal standard recoveries obtained for this project were within the target range specified in Method 8290. Also, since the quantifications of the native 2,3,7,8-substituted isomers were based on isotope dilution, the data were automatically corrected for variation in recovery and accurate values were obtained.

A laboratory method blank was prepared and analyzed with each sample batch as part of our routine quality control procedures. The results, found at the beginning of Appendix B, show one of the blanks to contain a trace level of OCDD. The value was below the calibration range for this method. One of the samples contained a similar level of this isomer and is flagged "B" on the data summary sheet. In general, levels less than ten times the background are not considered statistically different from the background. This indicaterihat th^samplfe processing procedttres-..^ -'--did-not-sign-ifie-aftthrirnprscnhe-resu-ltB-oM+ie-ana

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

/nelac'. CONFIDENTIAL, CITY_21MC100_003430532 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175187