Silica analysis report, Residential Sampling Project, Dec 2001

NYC 9/11 Public Portal Document

107 ffaddon Avenue 4HMSL► EMSL Analytical, Inc.- VKestmoni, NJ. 0S108 (856) 858-4800 12/26/01, Attention: U.S. EPA HQ Financial Services Division 1200 Pennsylvania Avenue NW Maildrop 2734R Washington, DC. 20460

Project: Residential Rof. Number: 360100701

Silica Analysis Performed by Method NIOSH 7500 Crystalline Particle Analysis Performed by X-Ray Diffraction (XRP)___________ Nuisance Dust Airborne Particulaie Sample Sample Analyte Analyte Analytical Weight Cone. Weight COQC. Analyte Sensitivity Sample ID Identification Analyte ID Volume (Dip) (mg/m’) ("ig) (lac/ra*) (mg/m’) (L)

[aiRF2-R1-23 Quartz 1544 0,041 0.02BS <0.004 -AS N/A 0.0026 Cristobalite <0.012 AS 0.0078 Tridymite N/A N/A N/A Calcite <0.004 0.0028 Portland/ Lime <0.020 0.0130 Gypsum <0.004 ■:AS 0.0026 Mica <0.011 ■AS 0.0071 Halite <0.006 0 0030 Fibrous Glass ND 0.6475

(RJTF.R1.23 Quartz 1568 0.053 0.0338 <0.004 N/A 0.0026 Cristobalite <0.012 0.0077 Tridymite M/A N/A N/A Calcite <0,004 <AS 0.0026 Portland/ Lime <0,020 <AS 0.0128 Gypsum <0,004 0.0026 Mica <0.011 0,0070 Halite <0.006 •4AS 0.0038 Fibrous Glass ND <AS 0.637.9

tR)lF-Rl-2S Quartz 1554 0.056 0.0360 <0.004 <AS N/A 0.0026 Cristobalite <0.012 <AS 0.0077 Tridymite N/A N/A N/A Calcite <0.004 <AS 0.0026 Portland/ Lime <0.020 <AS 0.O12S Gypsum <0.004 <AS 0.0026 Mica <0.011 <AS 0,0071 Halite <0.006 4AS 0,0039 Fibrous Glass NO <A3 0.643S Pihixtim Pcsutts ere in Sbers per cuPip M

John Ne\vton 26 December, 200/

Analyst Date of Analysis Disclaimer; The bborstory can only verify the concentration.^ of analytes on the Oller and not the final concentrations due to data obtained by non-lahorajory personnel. In the absence of a bulk dust sample, the specific fbnn of crystalline silica can not b< determined. Hence, alpha-quartz, the most prevalent form of crystalline silica, will be assumed, “<“ = Less than the stated value The lowest reportable value Is equivalent 10 tile I’uulytical Sensitivity which is calculated fiomtlie lowest reproducible concentration ofsilica detectable by lite instrument, -•VHA itereditod - Laboratory ID #100192

CONFIDENTIAL, CITY_21MC100_003423314 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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