Silica analysis report, Residential Sampling Project, Dec 2001

NYC 9/11 Public Portal Document

107 Haddon Avenue rEMSL Analytical, Inc.- 12/7/01

Attention: Sven Roddenbeck U.S.EPA - Residential ATSDR Mail Stop E-32 1600 Clifton Road., NE Atlanta, GA 30333

Project; Residential Sampling Ref. Number; 360100663

Silica Analysis Performed by Method NIOSH 7500 Crystalline Particle Analysis Performed by X-Ray Diffraction (XRP) Niiiaance Dust Airborne Particulate i Sample Sample Analyte Analyte % Anjlytical WeighI Coat. WeiEht Cone. Analyte Sensitivity Sample H) Jdentificahon Analyte ID Vohune (rag/ra’) (mg) (mg/ui’) (mg/m’) ("'St (L)

(R1IF-R2-14 Quartz 1142 0.032 0.0230 ■CO.O04 <AS N/A 0.0035 Cristobalite <0.012 <AS 0 0105 Tridymite N/A N/A N/A Calcite <0.004 <AS 0.0035 Portland/ Lime <0.020 </LS 0.Q17S Gypsum <0.004 <AS 0.0035 Mica <0.011 <AS o.onas Halite <0.00S <AS 0.00S3 Fibrous Gloss ND <AS o.erss [RIBRF-A.14 Quartz 0 0.146 JSiOIV/0! <0.004 N/A WA N/A Cristobaiiie <0.012 N/A N/A Tridymite N/A N/A 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 Halits <0.006 N/A N/A fibrous Glsss NO N/A N/A

tR)BRF-B-14 Quartz 0 0.213 #DIV/0! <0.004 N/A N/A N/A Cristobalite <0.012 HIA N(A Tridymite N/A N/A 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 <0.003 N/A M/A Fltirous Glass ND N/A N/A fl!}fcu3 &a!is ^esDirs stv in fibers cubic M

John Newton 7 December, 2001 Analyst Date of Analysis

Oisclaimcr: The laboratory can only verify the concenttations of analytes on iHe Citer and not the final conccmmitions due to data obtained by non-laboratery personnel. In the absence ofa bulk dust sample, the specific form of cij'staUiJie silica can not be determined. Hence, alphi-puaro, the most prevalent form ofcrystalline .silica, will be assumed. = Less titan the staled value The )o««st reportable value is ajuivalcnt to die .Analytical Sensitivity whxh is calculated from the lowest reproducible concentration of silica detectable by the iiLStrumcnl, AIHA Accredited - Laboratory ID H1C0192

CONFIDENTIAL, CITY_21MC1OO_OO3434O64 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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