Silica analysis report, Residential Sampling Project, Dec 2001

NYC 9/11 Public Portal Document

107 ffaddon Avenue 4EWISL► EMSL Analytical, Ina- JVestmDnt, NJ. 08108 (856) 858-4800 12/7/01 Attention: Sven Boddenheck L.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) Nuisance Dust Airborne Particulate Sample Sample Analyte Annlyte % Annlj’fical Weight Cone. Weight Cone. .Analyse Sensitivity Sample ED Identificatioa Analyte ID Volume (>"?) (mg/rn’l ('nu) (mg/III’) (rng/m’)

Quartz 1151 0.030 0,02S1 <0.004 <AS N/A 0.0035 (RIF-C-U Cristobalite <0,012 <AS 0.0104 Tridymite N/A N/A N/A Calcite <0.004 <AS 0.0035 Portland/ Lime <0 020 <AS 0.0174 Gypsum <0.004 <AS 0.0035 ■ Mica <0.011 <AS 0.0006 Halite <0.006 4AS 0.0052 Fibrous Gass NO <AS 0.6666

[R1RF-R1-14 Quartz 72S 0.1ZS 0.1 ?14 <a.ODrl <AS M/A 0.0055 Crietoballte <0.012 <AS 0.0165 Tridymite N/A N/A N/A COiCilB <0.004 <AS 0.0055 Portland/ Lime <0.020 <AS 0.0274 Gypsum <0.004 <AS 0.0055 Mica <0.011 <AS 0.0151 Halite <0.006 <AS 0.0062 Fibrous Glass NO <AS 1.3715

[R)TF-R1-14 Qosrte 1179 0.453 0,3342 <0.004 <AS N/A 0.0034 Cfistobalile <0.012 <AS 0.0102 Tridymite N/A N/A N/A Calcite <0.004 <AS 0.0034 Portland/ Lime <0.020 <AS 0.0170 Gypsum <0.004 <A3 0,0034. Mica <0.011 <AS 0.0093 Halite <0.006 <AS 0.0051 Fibrous Glass ND <AS 0.8482 Fibrous Slats RBStilb are In Stxrs per cubit M

John Newton 7 December, 2001 Analyst Date of Analysis DlscUimer; The laboratory can only veri^' the concentrations of analytes on the filler and not the final conoenfratio/ts due to data obtained by iion-laboraiory personnel. Ip the absence of a hulk dust sample, the specific form of ciysiaUinc silica can net be detemined. Hence, alpha-quartz, the most prevalent form of otysbillinc silica, wilt be as.™med. = l,eS6 than the stated value The lowest reportable value is equivaleet to the Analytical Sensitivity uhieh is calculated from the lowest reproducible concentration of silica detectable by the instniment. AIH/L Accredited - Luboratoty ID #100192

CONFIDENTIAL, CITY_21MC100_003434062 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000176083