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Analytical results for silica dust samples, Dec 2001

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Laboratory analytical results document from ATC Associates showing silica concentrations in air samples collected in December 2001.

NYC-WTC_000175061–000175062
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NYC 9/11 Public Portal Document

uec dG 01 10:29a PSC Analytical Services E109219667 P-4

INDUSTRIAL HVGIENE ENVIRONMENTAL TESTING • EPA^IVIAP 101262-0 • ^’Y DOHAIEIAC 10903 •NJDEP7702D • AIHA ACCREDITATION NO. 10O43S • PA DEP 06.353 •CTDPH PH-0223 •NCDENR599

ANALYTICAL SERVICES Analytical Results for ATC Associates VVorkOrder: ROI120280 Client Reference: 19125-0246; Silica in Air

Analyte Concentration Limit of Test Date Analyzed Detection Method /Analyst (ug) : (mg/m’) ( (ppm) (ug) Cli ent ID: S!, ATC-1213-STY Lab ID; -01A Date Sampled: 12/13/01 Matrix: Filter Air Vol.(L): 867 Total Particulate Matter <100 <0.115 100 TOTAL PARTICULAT 12/20/2001 ADM Silica (Quartz Total) <5 <0.00577 5 AIRBORNE SILICA 12/20/2001 ADM

Client ID: S2, ATC-1213-STY LabTD: -02A Date Sampled: 12/13/01 Matrix; Filter Air Vol.(L); 867 Total Particulate Matter <100 <0.115 100 TOTAL PARTICULAT 12/20/2001 ADM Silica (Quartz Total) <10 <0.0115 10- AIRBORNE SILICA 12/20/2001 ADM

Client ID: S3, ATC-1213-STY Lab ID: -03 A Date Sampled: 12/13/01 Matrix: Filter Air Vol.(L); 876 Total Particulate Matter <100 <0.114 100 TOTAL PARTICULAT 12/20/2001 ADM Silica (Quartz Total) <5 <0.00571 5 AIRBORNE SILICA 12/20/2001 ADM

Client ID: S4, ATC-l2I3-STy Lab ID: -04A Date Sampled; )3./13/0) Matrix; Filter AirVol.(L): 877 Total Particulate Matter <100 <0.114 100 TOTAL PARTICULAT 12/20/2001 ADM Silica (Quartz Total) <5 <0.00570 5 AIRBORNE SILICA 12/20/2001 ADM

Client ID: S5, ATC-1213-STY Lab ID; -OSA Date Sampled: 12/13/01 Matrix; Filter Air VoI.(L): 876 Total Parbculate Matter <100 <0.114 100 TOTAL PARTICULAT 12/20/2001 ADM Silica (Quartz Total) <5 <0.00571 5 AIRBORNE SILICA 12/20/2001 ADM

Client ID: S6, ATC-1213-STY LabrD:-06A Date Sampled: 12/13/01 Matrix: Filter AirVoI.{L); 807 Total Particulate Matter <100 <0.115 100 TOTAL PARTICULAT 12/20/2001 ADM Silica (Quartz Total) <5 <0430577 5 AIRBORNE SILICA 12/20/2001 ADM

Client ID: S7, ATC-1213-STY Lab ID; -07A Date Sampled; 12/13/01 Matrix: Filter Air Vol.(L): 876 Total Particulate Matter <100 <0.114 100 TOTAL PARTICULAT 12/20/2001 ADM Silica (Quartz Total) <10 <0.0114 10 AIRBORNE SILICA 12/20/2001 ADM

Client ID; SB, ATC-1213-STY Lab ID: -OSA Date Sampled: 12/13/01 Matrix: Filter Air Vol.(L): 884 Total Particulate Matter <100 <0.113 100 TOTAL PARTICULAT 12/20/2001 ADM Silica (Quartz Total) <5 <0.00566 5 AIRBORNE SILICA 12/20/2001 ADM

Client ID: S9, ATC-1213-STY Lab ID: -09A Date Sampled: 12/13/0! Matrix: Filter Air Vol.(L>: 876 Total Particulate Matter <100 <0.114 100 TOTAL PARTICULAT 12/20/2001 ADM Silica (Quartz Total) <5 <0.00571 5 airborne SILICA 12/20/2001 ADM

Client ID; SI 0, ATC-1213-STY Lab ID: -1OA Date Sampled; 12/13/01 Matrix: Filter Air Vol.(L); 867 Total Particulate Matter <100 <0.115 100 TOTAL PARTICULAT 12/20/2001 ADM Silica (Quartz Total) <5 <0.00577 5 AIRBORNE SILICA 12/20/2001 ADM

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CONFIDENTIAL, CITY_21MC1OO_OO3429656

SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175061

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