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NYC-WTC_000226992

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NYC 9/11 Public Portal Document

Jan IB 02 03:ISp PSC Rnalytical Services B109213BG7 P-4

INDUSTRIAL HYGIENE ENVIRONMENTAL TESTING • EPAINVLAP101262-0 -NY DOHTJELAC 10903 < NJ DEP 77020 •AIHAACCREOITATIONNO. 100439 -PADEPO&aBa ■ CT OPH PH-0238 ■ NC DENR 599

ANALYTICAL SERVICES Analytical Results for ATC Associates WorkOrder: R02010054 Client Reference: 19125-0246; Silica in Air

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

Client ID: ATC-0104-STY-S11 Lab ID: -HA Date Sampled: 1/4/02 Matrix: Filter AirVol.(L):816 Total Particulate Matter <100 <0.123 100 N050D 01/09/2002 ADM Silica (Quartz Total) <5,00 <0.00613 5 AIRBORNE SILICA 01/09/2002 ADM

Client ID: ATC-0104-STY-S12 LablD; -12A Date Sampled: 1/4/02 Matrix: Filter AirVoI.{L): 816 Total Particulate Matter <100 <0.123 100 N0500 01/09/2002 ADM Silica (Quartz Total) <5.00 <0.00613 5 AIRBORNE SILICA 01/09/2002 ADM

Client ID: ATC-0104-STY-S 13, Blank LabID:-l3A Date Sampled: 1/4/02 Matrix: Filter Air Vol.(L): NA I Total Particulate Matter <100 100 N0500 01/09/2062 ADM Silica (Quartz Total) <5.00 5 AIRBORNE SILICA 01/09/2002 ADM ■ (a) Analysis indicates possible breakthrough; back section result is greater than % of the front section result.

Genera! Notes; <; Less than the indicated limit of detection (LOD). Infonnation not available or not applicable. Back sections were checked and showed no significant breakthrough.

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NYC-WTC_000226993Source: NYC Law Department, mirrored locally

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