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Silica analysis report, Residential Sampling Project, Dec 2001

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Laboratory findings on silica concentrations from residential sampling projects submitted to the EPA in late December 2001.

NYC-WTC_000176089–000176098
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NYC 9/11 Public Portal Document

107Haddon Avenue 4 EMSL► EMSL Analytical^ Inc.- Westmont^ NJ. 08108 (856) 858-4800 12/26/01 Attention: V.S. EPA HQ Financial Services Division 1200 Pennsylvania Avenue NW Maildrop 2734R Washington, DC. 20460

Project: Residential Ret Number: 360100701

♦ Cerfificaie Of Ana lysis

Sample id description Particle ID Concentration Analytical Sensitivity (%}

tRlVS-R2-^3 Residence 2 Quartz ND 0.01 Cfialobalite ND 0.03 Tridymite ND N/A Calcite ND 0.01 Portland/ Lime ND 0.05 Gypsum 1.3 0.02 Mica ND 0.05 Halite ND 0.03 Fibrous Glass O.S 0.1

Analysis Performed By: Polarized Light Microscopy (PLM) Scanning Electron Microscopy (SEM) X-Ray Diffraction (XRD)

John Neyvton 26 December. 200} Analyst Date of Analysis TNTQ = Too Numerous To Quuirtiiy NO = None Delected

CONFIDENTIAL, CITY_21MC100_003423320 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176098

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NYC-WTC_000176098Source: NYC Law Department, mirrored locally

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