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NYC-WTC_000224761

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NYC 9/11 Public Portal Document

11 da -bcj uc uo: 13p P- =

INDUSTRIAL HYGIENE ENVIRONMENTAL TESTING FSC ■EPA/NVIAP101262-0 • MY DCHAELAC 10903 •NJDEPPA020 •AIHA ACCREDITATION NO. 100439 ■ PA DEP 06-353 • CT DPHPiW)2M •NCDENR599 Analytical Results for ATC Associates WorkOrder: R02050822 Client Reference: 19125-0289, Silica

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

Client ID; ATC-U52U-1 50M-.S1 Lab ID: -01A Dale Sampled; 5/20/02 Matrij: Filter Air Vol.(L): 1020

Total Particulate Matter <50.0 <0.0490 50 N0500 05/28/2002 ADM

Silica (Quartz Total) <5.00 <0.00490 5 AIRBORNE SILICA 05/28/2002 ADM

Client ID: ATC-052D-15OM-S2 Lab ID: -02A Date Sampled; 3/20/02 Matri.K; Filter AirVoI.(L): 1020

Total Particulate Matter <50.0 <0.0490 50 N0500 05/28/2002 ADM

Silica (Quartz Total) <5.00 <0.00490 5 AIRBORNE SILICA 05/28/2002 ADM

Client ID; ATC-0320-150M-S3 Lab ID: -OTA Date Sampled: 5/20/02 Matrix: Filter AirVul.(L); 1020

Total Particulate Matter <50.0 <0.0490 50 N0500 05/28/2002 ADM

Silica (Quartz Total) <5.00 <0.00490 5 AIRBORNE SILICA 05/28/2002 ADM

Client ID: ATC-0520-130M-S4 Lab ID: -04A Date Sampled; 5/20/02 Matrix; Filler AirVoML): 1020

Total Particulate Matter <50.0 <0.0490 50 N05O0 05/28/2002 ADM

Silica (Quartz Total) <25.0 <0.0245 25 AIRBORNE SILICA 05/28/2002 ADM

Client ID; ATC-0520-150M-S5 Lab ID: -OSA Date Sampled: 5/20/02 Matrix; Filter AirVol.(L); NA

Total Particulate Matter <50.0 50 N050O 05/28/2002 ADM

Silica (Quartz Total) <5.00 5 AIRBORNE SILICA 05/28/2002 ADM

(a) Analysis indicates possible breakthrough; back section result is greater than 0% of the front section result.

General Notes; <: Less than the indicated limit of detection (LOO). —: Information not available or not applicable. Back sections were checked and showed no significant breakthrough.

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NYC-WTC_000224761

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NYC-WTC_000224761Source: NYC Law Department, mirrored locally

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