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Silica analysis report, Residential Sampling Project, Nov 2001

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Document presenting X-ray diffraction results for silica and mineral content from residential sampling in November 2001.

NYC-WTC_000176072–000176074
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NYC 9/11 Public Portal Document

107 Haddon Avenue 4EMSL► EMSL Analytical, Inc.- Westmont, NJ. 08108 (856) 858-4800 11/28/01 Atteation: U.S. ErA HQ .Financial Services Division 1200 Pennsylvania Avenue NWMaiidrop 2734R "Washington, DC. 20460

Project: Residential Sampling Ret Number: 360100632

♦ Ceriificai'ie O£ Analysis ♦

Sample ID Dacriplion Particle//> C^ncen/rallait Analytical Sensiai’iiy eA) <%)

(R)VS-R1-7 2r' Floor Querte 14.4 0.D1 Cristobafita ND 0.03 Tridymite ND WA Calcite 12.5 0.01 Poniand/ Lime 2.1 0.05 Gypsum 1.9 0.02 Mica ND O.OS Halite ND 0.03 Fibrous Glass 2.7 0.1

(R)VS-R2-7 21’ Floor Duarte 21.1 0.01 Cristobalils ND 0.03 Tridymltfi ND NZA Calcite 15,9 0.01 Portland/ Lime 3.4 0.05 Gypsum 3.S 0.02 Mica ND 0.05 Halite 0.09 0.03 Fibrous Glass 3.3 0.1

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

Jolin Neyvton 26 November, 2001 Analyst Date of Analysis TMTQ = Too Numerous To Quanlify ND = None Deiccicd

CONFIDENTIAL, CITY_21MC100_003433977 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176073

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NYC-WTC_000176073Source: NYC Law Department, mirrored locally

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

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

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Laboratory results for silica content in samples collected under the Residential Sampling project in December 2001.

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

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