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Silica analysis report, Residential Sampling Project, Nov 2001

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Laboratory data sheet showing quartz and calcite concentrations from samples collected during the Residential Sampling project.

NYC-WTC_000176075–000176076
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NYC 9/11 Public Portal Document

107Haddon Avenue fMSL► EMSL Analytical, Inc.- Westmont, NJ. 08108 4

(856) 858-4800 11/29/01 Attention: U.S. EPA HQ Financial Services Division 1200 Pennsylvania Avenue NW Maildrop 2734R Washington, DC. 20460

Project: Residential Sampling Ref. Number: 360100635

Cerfificaite Of Analysis ♦

Samp/e ID Description Particle [D Concentraaan Analytical Sensitivity (%) <%)

(R)VSC-9 In Lobby Quartz 24,6 0.01 Cristobalite NO 0.03 Tfioymite ND N/A Calcite 9.3 0.01 Portland/ Lime S.5 0.05 Gypsum 1S.0 0 02 Mica 0.09 O.OS Halite 0.08 0.03 Fibrous Glass 2.3 0,1

(R1VS-R1-9 Floors Quanz 9.9 0.01 Cristobalite MD 0.00 T ridjmile ND N/A Caiclle 2.1 0.01 Portland/ Lime o.a 0.05 Gypsum 4.7 C.02 Mica ND 0.05 Halite ND 0.03 Fibrous Glass 1.1 0.1

Anaiysis Peifomed By: Polarized Light Microscopy (PLM) Scanning Electron Microscopy (SEM) X-Ray Diffractioo (XRD)

John NeMon 28 November. 200J Analyst Date of Analysis TOTQ = Too Nunureus To Quantify ND = None Detected

CONFIDENTIAL, CITY_21MC100_003434003 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176075

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NYC-WTC_000176075Source: NYC Law Department, mirrored locally

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Revised laboratory report detailing silica analysis results for residential sampling conducted in December 2001.

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