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Analytical results for silica dust samples, Feb 2002

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Laboratory analytical results document from ATC Associates showing silica concentrations in air samples collected in early February 2002.

NYC-WTC_000175065–000175067
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NYC 9/11 Public Portal Document

Feb 05 02 11:53a PSC Analatical Sei-vices 6109219667 p. 3

INDUSTRIAL HYGIENE ENVIRONMENTAL TESTING •EPANVtAP 101262-0 •NY DOHAIELAC 10903 • NJ DEP 77020 • AIHAACCREDiTATION NO. 100438 • PA DEP 06-353 •CTDPHPH-[)238 ■ NC DENR 593

ANALYTICAL SERVICES Analjlical Results for ATC Associates WorkOrder; R02010328 Client Reference: 19125-0246, Silica

Analyte Concentration Limit of Test Date Analyzed Detection Method /Analyst (ug) (mg/m’) ; (ppm) (UR)

Client ID: S7 ATC-OI 17-STY. LablD: -07A Date Sampled: 1/17/02 Matrix: Filter AirVol.(L): 816 Total Particulate Matter <50.0 <0.0613 50 NO5O0 01/24/2002 ADM

Silica (Quartz Total) ’ 12.0 0.0147 10 AIRBOFtNE SILICA 01/24/2002 ADM

Client ID: S8 ATC-OI 17-STY Lab ID: -OSA Date Sampled; I/17/02 Matrix: Filter Air Vol.(L): 816 Tolal Particulate Matter <50.0 <0.0613 50 NO500 01/24/2002 ADM

Silica (Quartz Total) <10.0 <0.0123 10 AIRBORNE SILICA 01/24/2002 ADM

Client ID: S9 ATC-OI 17-STY LablD: -09A Date Sampled: 1/17/02 Matrix: Filter Air Vol.(L): 816 Total Particulate Matter <50.0 <0.0613 50 N0500 01/24/2002 ADM 1^0^ Silica (Quartz Total) <10.0 <0.0123 10 AIRBORNE SILICA 01/24/2002 ADM

Client ID; SIO ATC-OI 17-STY LablD: -lOA Date Sampled: 1/17/02 Matrix; Filter AirVol.(L): 816 Total Particulate Matter <50.0 <0.0613 50 ND500 01/24/2002 ADM '~IO^ Silica (Quartz Total) <10.0 <0.0123 10 AIRBORNE SILICA 01/24/2002 ADM

Client ID; Sil ATC-OI 17-STY LablD: -HA Date Sampled; 1/17/02 Matrix; Filter AirVol.(L): 816 Tolal Particulate Matter <50.0 <0.0613 50 N0500 01/24/2002 ADM

Silica (Quartz Total) <10.0 <0.0123 10 AIRBORNE SILICA 01/24/2002 ADM

Client ID; S12 ATC-OI 17-STY LablD: -12A Date Sampled: 1/17/02 Matrix: Filter Air Vol.(L): 810 Total Particulate Matter <50.0 <0.0613 50 NO500 01/24/2002 ADM

Silica (Quartz Total) ' <10.0 <0.0123 10 AIRBORNE SILICA 01/24/2002 ADM

Page 2 of 3

CONFIDENTIAL, CITY_21MC100_003429689 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175066

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NYC-WTC_000175066Source: NYC Law Department, mirrored locally

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