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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 on December 7, 2001.

NYC-WTC_000175063–000175064
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NYC 9/11 Public Portal Document

Dec 19 01 0S;3Ga PSC flnalatical Services Bia9219667 P- *

INDUSTRIAL HYGIENE ENVIRONMENTAL TESTING •EPANVLAP101262-D • NT DDHiNELAC 10903 • NJ DEP 77020 • AIHAACCREDITATION NO. 1(10439 • PA DEP OB-353 •CT DPH BH-0238 •NCDENR699

ANAI YTICAT, SERVICES Analytical Results for ATC Associates WorkOrder; ROl120151 Client Reference: 19125-0246; Silica (12/7/01)

Analyte Concentration Limit of Test Date Analyzed Detection Metliod /Analyst (ug) ; (mg/m’) ; (ppm) (“g)

Client ID: Cl - ATC-1207-STY LablD: -OlA Date Sampled: 12/7/01 Matrix: Filter AirVoI.(L): 816 Total Particulate Matter <100 <0.123 100 TOTAL PARTICULAT 12/14/2001 ADM Silica (Quartz Total) <5 <0.00613 5 AIRBORNE SILICA 12/14/2001 ADM

Client ID; C2 - ATC-1207.STY Lab ID: -02A Date Sampled: 12/7/01 Matrix; Filter AirVol.(L); S25 Total Particulate Matter <100 <0.121 100 TOTAL PARTICULAT 12/14/2001 ADM Silica (Quartz Total) <5 <0.00606 5 AIRBORNE SILICA 12/14/2001 ADM

Client ID; C3 - ATC-1207-STY Lab ID: -03A Date Sampled: 12/7/01 Matrix: Filter Air Vol.(L): 823 Total Particulate Matter 103 0.12S 100 TOTAL PARTICULAT 12/14/2001 ADM Silica (Quartz Total) <5 <0.00608 5 AIRBORNE SILICA 12/14/2001 ADM

Client ID: C4 - ATC-I207-STY LabID;-04A Date Sampled: 12/7/01 Matrix; Filter Air Vol.(L): 825

Total Particulate Matter <100 <0.121 100 TOTAL PARTICULAT 12/14/2001 ADM Silica (Quartz Total) <5 <0.00605 5 AIRBORNE SILICA 12/14/2001 ADM

Client ID: C5 - ATC-AY-STY Lab ID: -05A Date Sampled: 12/7/01 Matrix: Filter AirVoI.(L); 816 Total Particulate Matter <100 <0.123 100 TOTAL PARTICULAT 12/14/2001 ADM Silica (Quartz Total) <5 <0.00613 5 AIRBORNE SILICA 12/14/2001 ADM

Client ID: C6 - ATC-1207-STY LabID:-06A Date Sampled: 11'7/01 Matrix; Filter AirVol.(L): 816

Total Particulate Matter <100 <0.123 100 TOTAL PARTICULAT 12/14/2001 ADM Silica (Quartz Total) <5 <0.00613 5 AIRBORNE SILICA 12/14/2001 ADM

Client ID: C7 - ATC-I207-STY Lab ID: -07A Date Sampled: 12/7/01 Matrix: Filter AirVol.(L): 821 Total Particulate Mailer <100 <0.122 100 TOTAL PARTICULAT 12/14/2001 ADM Silica (Quartz Total) <5 <0.00609 5 AIRBORNE SILICA 12/14/2001 ADM

Client ID: C8 - ATC-1207-STY LablD:-08A Date Sampled: 12/7/01 Matrix: Filter AirVol.(L): 819

Total Particulate Matter <100 <0.122 100 TOTAL PARTICULAT 12/14/2001 ADM Silica (Quartz Total) <5 <0.00611 5 AIRBORNE SILICA 12/14/2001 ADM

ClientlD: C9 - ATC-1207-STY Lab ID; -09A Date Sampled: 12/7/01 Matrix: Filter AirVBl.(L): 831 Total Particulate Matter <100 <0.120 100 TOTAL PARTICULAT 12/14/2001 ADM Silica (Quartz Total) <10 <0.0120 10 AIRBORNE SILICA 12/14/2001 ADM

Client ID: CIO - A rC-!207-STY LabID:-10A Date Sampled: I2/7/0I Matrix: Filter Air Vol.(L): 826

Total Particulate Matter <100 <0.121 100 TOTAL PARTICULAT 12/14/2001 ADM Silica (Quartz Total) <5 <0.00605 5 AIRBORNE SILICA 12/14/2001 ADM

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CONFIDENTIAL, CITY_21MC100_003429673 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

NYC-WTC_000175063

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NYC-WTC_000175063Source: NYC Law Department, mirrored locally

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