Silica analysis report, Residential Sampling Project, Dec 2001

NYC 9/11 Public Portal Document

107 Haddon Avenue 4 ^EMSL Analytical, Inc,- Westmont, NJ. O8IOS (856) 858-4800 12/4/0] Attention: LT.S.SPA HQ Financial Semces Division 1200 Pennsylvania Avenue NW .Maildrop 2734R Wiishington, DC. 20460

Project: Residential Sampling R«f. Number; 360100623

Silica Analysis Performed by Method NIOSH 7500 Crystalline Particle Analysis Performed by X-Ray DiffractionJXRp)_________ Nuisance jDust Airborne Pariiculaie Sample Sample AnaJyu .Anolyte % .Anablical Weight Cone. Weight Cone. Analyte ScnsillviO' Sample ID Identification Analyte ID Volume (mg) (ing/m*) (mg) (mg/m’) (LI

[RJRF-R2-4 Qua/12 7S7 0.039 0.0515 <0.004 <AS N/A 0.0053 cristobalite <0.012 <AS 0.0159 Tridymite N/A N/A N/A Calcite <0 004 <AS 0.0053 Portland/ Uma <0.020 <AS 0.0264 Gypsum <0.004 <AS 0.OO5S Mica <0.011 <AS 0.0145 Halite <0.008 <AS 0.0079 Fibrous Glass 2.000 2.6421 1.3311

[Rrrr-R^-a Quart 1201 A A <0.004 <AS N/A 0.0033 Crislooalilfi <0.012 <AS 0.0100 Tridymite N/A N/A NIA Caltile <0.004 <AS 0.0032 Pomand/ Lime <0.020 <A3 0,0167 Gypsum <0,004 </AS 0.0033 Mica <0.011 <AS 0.0092 Halite <0.006 <AS 0.0050 Fibrous Glass ND <AS o.BSsa

(R]IF-R2-» Quartz 1221 0.016 0.0131 <0.004 <AS N/A 0.0023 Cristobalite <0.012 <AS 0.0098 Tridymite N/A N/A N/A Calcite <0.004 <AS 0.0033 Portland/ Lime <0.020 <AS 0.0164 Gypsum 0.004 0,0033 0.0033 Mica <0.011 <AS 0.0090 Halite O.OOS 0,0049 0.0043 Fibrous Glass 1.000 0.81S3 C.8IS3 G/ass ficsifiiQ era in fiben per cubic w

Joh/t Newton 4 December, 200] Analyst Date of Ana lysis Disclaimer; The laboratory can only verily the concentrations ofanalytes on the filter and not the Cral coneeiurationa due to data obtained by non-labotamiy personnel. In the absence ofa bulk dust sample, die speeJ^c form of erysiallinf silica can not be determined. Hence; aJpha-quirtx the most prevalent form o.f crystalline silioi.. will be assumed. “<’' = Lew: than The stated value The lowest reportable value is cqurralept to the Analyhcal Sensitivity which is calculated from the loiveui reptoducibh- conccncaiion of silica detectable by the instamient. AIHA Accredited - Laboratory ID //190192

CONFIDENTIAL, CITY_2IMCI00_003433961 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT, 2008

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