Silica analysis report, Residential Sampling Project, Dec 2001

NYC 9/11 Public Portal Document

107 ffaddon Avenue 4EMSL EAfSL Analytical, Inc.- Wesimont,NJ. 08108 (856) 858-1800 12/4/01 Attention: HQ Financial Services Division 1200 Pennsylvania Avenue NW Maildrop 2734R Washington, DC. 20460

Project: Residential Sampling Rd Number: 360100623

Silica Analysis Performed by Method NIOSH 7500 Crystalline Particle Analysis Performed by X-Ray Diffraction (XRP)_________ Nuisance Dust Airborne Panlcu/aie Sample Sample Analyte Analyte % Annljlical Weight Cone. Weighl Cone. Analyte Sen.iitivily Sample ID Identification Analyte ID Volume (mg) (mg/tn*) (mg) (ntB/m’) (P [RJRF-C-4 Quaru 751 0.018 0.0240 <0.004 M/A 0.0053 Crlstobalrte <0,012 <AS 0.0160 Tridymite N/A N/A N/A Calcite <0 004 <AS 0.0053 Portland/ Lime 0.020 0.0267 0.02SS Gypsum 0.004 0 0055 <3.0053 wiica <0.011 <AS 0.0140 Haute <0.006 <AS 0.0080 Fibrous Glass 1.030 1.3318 1.3318

[R]TF.C-4 Quara 1218 A A <0.004 <AS N/A 0.0033 Cn’siobalite <0.012 <AS 0.0099 Tridymiie NjA N/A N/A Caldte <0.004 <AS 0.0033 Ponland/ Lime 0.020 0.0165 0.0104 Gypsum 0.004 0.0034 0.0033 Mica <0.011 <AS 0.0090 Halite <0.006 <AS 0.0049 Fibrous Glass ND <AS <3.8213

(RllF-C.4 Quartz 1230 0.025 0.0203 <0.004 <AS N/A 0.0033 Cristobolito <0.012 <AS 0.0098 T<i<1yrriile N/A N/A N/A Calcite <0004 <AS 0.0033 P<3rtian<l/ Lime <0.020 <AS 0.0163 Gypsum 0.004 0.0034 0.0033 tZiCS <0.011 <AS 0.0089 Halite <0.006 <AS 0.0040 Fibrous Glass 3.Q0Q 2.4397 O.S132 Pbfou& GiBV Pcsufls on in fibers n^r cvbic M

John Neivton 4 December, 2001 Analyst Date of Analysis Disclaimer: The laboratory can only verify the ojucentrarions of analytes on the filter anil not the Cn.al eodcenirab'ons due to date otained by non-laboratoty personnel. In the absence of a bulk <3ust sample. Ite SfKXific form of crystal line silica cm not be deteminial. Hence, alphn-quarH, the most prevalent form ofcrystalline silica, will be assumed, = Less tbAB the stated value The lowest reportable value b equivalent to Ihc Analytical Sensitivity which is calculated from the loweyl reproducible eoncamarion of silica dctcciable by the instrument. AIIIA AccrcdilerJ - Laboratory IO bl 00192

CONFIDENTIAL, CITY_2IMCl00_003433959 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176067