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Silica analysis report, Residential Sampling Project, Dec 2001

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

NYC-WTC_000176066–000176071
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NYC 9/11 Public Portal Document

107 ffaddon Avenue EMSU EMSL Analytical, Inc.- Wesitmint, NJ. O8IO8 <1 (856) 858-4800 12/4/01 AttcDtion; U.S.EPA HQ Financial Service*; Division 1200 Pennsylvania Avenue NW Maildrop 2734R Washington, DC. 20460

Project: Residential Sampling Ret Number; 360100623

Silica Analysis Perfomoed by Method NIOSH 7500 Crystalline Particle Analysis Performed by X-Ray Diffraction (XRD)_________ Nuisance Dust Airborne Particulate Sum pie Sample .Anilytu Aoalyfe % Aualytical Weight Cone. Weight Cone. Analyte Senaitivit}' Sample ID JdOBtrCcation Analyte ID Volume (mis) tmg/m’) (mg/ni') (mg/m') fJL)

Quart 0 0.000 N/A <0.004 N/A N/A N/A [RjeRF-A.<l Cristobalite <0.012 N/A N/A Tridymite M/A N/A N/A Calc/le <0.004 N/A N/A Portland/ Lime <0.020 N/A N/A Gypsum <0.004 N/A N/A Mica <0.011 N/A N/A Halite <0,006 N/A N/A Fibrous Glass NO N/A N/A

[RlBRF-B-1 Quartz 0 0.000 N/A e£>.004 N/A N/A N/A Cristobalite <0.012 N/A N/A TriOyiTlite N/A N/A N/A Calcite <0.0tM N/A N/A Portland/ Lime <0.020 N/A N/A Gypsum <0.004 N/A N/A Mica <0.011 N/A N/A Halite <0.006 N/A N/A Fibrous Class ND N/A N/A

iRjeiF-A-4 Quart 0 0.000 N/A <0.004 N/A N/A N/A CrisiDhalite <0.012 NIA N/A Tridymite WA NIA N/A Calcite <0.004 N/A N/A Portland/ Lime <0.020 N/A N/A Gypsum <0.004 N/A N/A Mica <0.011 N/A N/A Halite <0.005 N/A N/A Fibrous Glass ND N/A N/A Fibmus QiDiS FQSfjIti OK in noQm pcreubls M

John Newton 4 December, 2001 Analyst Date of Analysis

DjEcIaimcT: The laboratory ram only verify the concerrtartioas ofanalytris on the filler apd not the final cont’enttations due to data obtained by non-laltoratoty perMtine). In tire absence of a balk dust sample, the specific fortnof crystalline silica can not be determined. Hrmec. alpha-quartz, the most prevalent Corm of crystalline silica, wll be assumed. = Less than the stated value The lowest repomble value Ls equivalent to the AoalyrietU Sensitivity which is calculated from the lowest reproducible concentration of silica detectable by the insmjtnent, AJH A Accredited - Laboratory ID # 100192

CONFIDENTIAL, CITY_21MC100_003433962 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176070

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NYC-WTC_000176070Source: NYC Law Department, mirrored locally

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