Silica analysis report, Residential Sampling Project, Dec 2001

NYC 9/11 Public Portal Document

107Haddon Avenue MSL ^EMSL Analytical, Inc.- Wesonont, NJ. 08108 (856) 858-4800 J2/26/01 Attention; U.S. EPA HQ Financial Scmces Division 1200 Pennsylvania Avenue NV/ Maildrop 2734R Washington, DC, 20460

Project: Residential Ref. Number; 360100701

Silica Analysis Performed by Method NIOSH 7500 Crystalline Particle Analysis Performed by X-Ray Diffraction (XRD)__________ Nuisance Dust Aiihame Pari/culafe Sample Sample Ainalyte AiiMlytc % .Analjlical Weicht- Cooc. Weight (one. Analyte SettSiliviej’ Sample ID Identification Analyte BO Volume (mg/m*) (me) (nig/m^) (mn/m’) (™g) Oi)

tRJRF-0-23 Quartz 1012 A N/A <0,004 <AS N/A 0.0040 Cristobalite <0,012 sAS 0.0119 Tridymite N/A N/A N/A Calcite <0.004 <AS 0.0040 Portland/ Lime <0.020 cAS 0.0198 Gypsum <0.004 CAS 0.0040 Mica <0.011 <AS 0.0109 Halite <0.005 0.0059 Fiorous Glass NO <AS 0.S884

[RJRF2-0-23 Quartz 1009 0.021 D020B <0.004 <AS N/A 0.0040 Cristobalite <0.012 <AS 0.0119 Tridymite N/A N/A N/A Calcite <0.004 <AS 0.0040 Portland/ Lime <0.020 <AS 0.0198 Gypsum <0.004 <AS 0.0040 Mica <0.011 <AS 0,0109 Halite <0.008 <AS 0,0059 Fibrous Glass ND <AS 0,9907

(R]TF-0-2S Quartz 1596 o.oao 0,0501 <0.004 <AS N/A 0,0025 Cristobsliie <0.012 <AS 0.0075 Tridymite N/A N/A N/A Caldte <0.004 sAS 0.0025 Portland/ Lime <0.020 </ts 0.0125 Gypsum <0.004 <AS 0,0025 Mica <0.011 <AS 0.0069 Halite <0.006 <AS 0.0038 Fibraus Glass ND <AS 0.6266 PlCrsus Qfoss Pewits in fibers, ocr cubic M

Joltn Ne^vton 26 December-, 200} Analyst Date of Analysis Disclaimer: The laborainry can only verify' the cooc^ntx^tions of onalyrw on the filter and not die final cxjDccntrations due to dau obuined bj' non-laboraiory personnel. In the absence of a bulk dust sample, the specific fonn of cr>'stal]inc silica can not be determined Hence, alpha-quartz, the most prevaJenr form of eo'aalline silica, will be assumed. "<” = Less than the lUtcd xnluc The lowest reportable value is equivalcor to tlic Analytical Sensitivity which is calculated from the lowest reproducible conccnlntion of silica delectable by the instrument. AdHA Accredited - Labontory ID #100192

CONFIDENTIAL, CITY_21MC100_003423311 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176089