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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 Rnalytical Services S1032196S7 p-2

F’sc: INDUSTRIAL HYGIENE > EPAWLAP 101262-0 •AIHAACCREDITATiONNO. 100439 •NCDENR 599 ENVIRONMEMTAL TESTING •NY OOHINELAC 10903 • PA DEP 06-353 ■ NJ DEP 77020 • CT DPH PH-0238

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

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

Client ID: SI ATC-0117-STY Lab ID: -01A Date Sampled: 1/17/02 Matrix: Filter AirVol.(L): 816 Total Particulate Matter <50.0 <0.0613 50 N050O 01/24/2002 ADM

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

Client ID: S2 ATC-0117-STY Lab ID: -02A Date Sampled: 1/17/02 Matrix: Filter Air Vol.(L): S16

Total 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: S3 ATC-0II7-STY L,ab ID: -03.A Date Sampled: 1/17/02 Matrix: FiIter Air Vol.(L): 816

Total Part culate Matter <50.0 <0.0613 50 N0500 01/24/2002 ADM ^UV' IM I r-^ yPool Silica (Quartz Total) <10.0 <0.0123 10 AIRBORNE SILICA 01/24/2002 ADM

Client ID: S4 ATC-0117-STY LablD: -04A Date Sampled: 1/17/02 Matrix: Filter AirVol.(L):8l6 Total 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: S5 ATC-0117.STY LablD: .05A Date Sampled: 1/17/02 Matrix: Filter AirVol.(L): 816

Total 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: S6 ATC-0117-STY Lab ID: -06A Date Sampled: 1/17/02 Matrix: Filter Air Vol.(L): 8 16

Total Particulate Matter <50.0 <0.0613 50 N0500 01/24/2002 ADM

Silica (Quartz Total) 11.0 0.0135 10 AIRBORNE SILICA 01/24/2002 ADM

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CONFIDENTIAL, CITY_21MC100_003429688 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175065

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NYC-WTC_000175065Source: NYC Law Department, mirrored locally

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