Silica analysis report, Residential Sampling Project, Dec 2001

NYC 9/11 Public Portal Document

J07 Haddon Avenue 4 gWSL EMSL Analytical, Ina- Westmom, NJ. 08108 (856) 858-4800 12/26/01 Attention: U.S. EPA HQ Financial Services Dhision 1200 Pennsylvania Avenue NW Maildrop 2734R Washington, DC. 20460

Pro.i«ct: Residential Ref. Number: 360100701

Silica Analysis Performed by Method NIOSH 7500 CiystaUine Particle Analysis Performed by X-Ray Diffraction^flRDJ__________ /Vuinance Dusi Airborne Pariiculaie Sample Sample Analyte Analyte % .Analytical Weight Cone. Weight Cone. .Analyte Seosiuviry Sample ID Identification Anahle ED Volume (mg/in’) (ingyra’l (™g) (mg) ___________ (L)

[R]TF-C-23 Quartz 1570 0,084 0,0408 <0.004 •AS N/A 0,0025 Cristobalite <■3.012 •AS 0,0076 Tridymite N/A NZA N/A Caldte <0.004 •AS 0,0025 Portland/ Lime <0.020 •AS 0.0127 Gypsum <0.004 "AS 0.0025 Mica <0.011 -AS 0.0070 Halite <0.006 ■AS 0.0036 Fibrous Glass 2.000 1,2877 0.6333

[RJIF-C.23 Quartz 1546 O.OSS 0.0356 <0.004 NZA 0.0026 Cristobalite <0.012 0.0076 Tridymite N/A OJ/A N/A Calcite <0.004 0.0026 Portland/ Lime <0.020 0.0129 Gypsum <0.004 0.0026 Mica <0.011 0.0071 Halite <■0.006 0.0039 Fibrous Glass ND 0.64S7

[R]RF-R1-23 Quartz G78 A N/A <0,004 <AS N/A 0.0041 Cristobalite <0,012 ■AAS 0.0123 T ridymite N/A NZA N/A CaldtB <0,004 <AS 0.0041 Portlafid/ Lime <0,020 <AS 0.0204 Gypsum <0,004 0.0041 Miea <0 011 0.0112 Halite <0.000 0.0061 Fibrous Glass ND 1.0221 fibmus Glass flesuita are in ftiers per cubic M

John J^ewton 26 December, 2001 Analyst Date of Analysis Disclaimer The laboratory can only verify the concentrntioiis of anilytes on ttic filter and not the final conocotrationsdiie to data obtiiztcd by non-labaaiorj' personnel, In the absence of a bulk dust sample, die specific font) of crystalline silica can not be dclcnrjned. Hence, alpha^iuarlz, (he most prevalent form of ciystaJlinc silica, will be assumed. "<” = Less than the tatezd value The lowrsl reportable value is equivalent to the Analyfieal Sensitivity which is calculstod from the lowest reproducible concentration of silica detectable by the iesuument. AJHA Accredited - Laboratory ID # 100192

CONFIDENTIAL, CITY_21MC100_003423313 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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