Silica analysis report, Residential Sampling Project, Dec 2001

NYC 9/11 Public Portal Document

i07Haddon Avenue 4 ► EMSL Analytical, Inc.- Westmont, NJ. 08108 (856) 858-4800 12/20/01 Attention: U.S. EfA UQ Financial Services Division 1200 Pennsylvania Avenue NW Maildrop 2734R WashiDgtoo, DC. 20460

Project: Residential Ref. Number: 360100718

Silica Analysis Performed by Method NIOSH 7500 Crystalline Particle Analysis Performed by X-Ray Difffraction^ Nuisance Dust Airborne Paniculate Sample Sample Analyte Analyte % Analytical Weight Cone. Vl’cigbl Cone. Analyte Sensitiviiy Sample ID Identification Analyte ID Volume (ong) (mg/ra’l (Btgt (mg/ra’) (L)

IP]IF-D.2a Revised Sample Quartz 1457 0.237 0,1627 0.004 <AS NZA 0.0027 Data (20 Dec, 01) Cristebalite <0.012 CAS 0.0082 Tridymite N/A N/A N/A Calcite 0.004 <AS 0.0027 Portland/ Lime 0.020 <AS O.D137 Gypsum <0.004 <AS 0,0027 Mica <0.011 <AS 0.0076 Halite <0.006 <AS 0.0041 Fibrous Glass ND cAS 0,S3S5

[R]PF-C-28 Quartz 898 A NM <0.004 <AS N/A 0.0045 Cristobalite <0.012 <AS 0.0134 Tridymite NZA N/A N/A . Calcite <0,004 </i«S 0.0045 Portland/ Lime <0.020 <A3 0,0223 Gypsum 0.004 0.0047 0.0045 Mica <0,011 <AS 00122 Halite <0.008 <AS 0,0067 Fibmus Glass ND <AS 1.1134

tRinF2-C-28 Quartz 1396 0.060 0.0430 <Q.DM <AS N/A 0.0029 Cristebalite <0,012 <AS o.oose Tridymite N/A N/A N/A Calcite <0.004 <AS 0.0029 Portland/ Lime <0.020 <AS 0.0143 Gypsum <0.004 <AS C.0029 Mica <0.011 <AS 0.0079 Halite <0.006 <AS 0.0043 Fibnus Glass /VO <AS 0.7165 Fihnus Glsise Resuftf sre in ^rcuois M

Analyst Date of Analj-sis DissiiivKi- The laboratory can cnlj' verify the concemrations ofanalytes on the filler and not the final concentrations due to data ohtnined by non-Uborafory personnel. In the absence of a bulk do.ct sample, the specific form of crystalline silica can not be detennined. Hence, alphaijuarta, tliemoit prevalent fonn of crystalline silica, will be assumed. = Less than ’lie slated value The lowest reportable value is equivalent to the Analytical Sensitivity which is calculated from the lowest reproducible contenoatitin of silica detectable by Jie iastrumaiL AIHA Accredited - Laboratory ID # 100192

CONFIDENTIAL, CITY_2IMCl00_003423338

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176099