NYC-WTC_000208230

NYC 9/11 Public Portal Document bep iiu Uid lU;51a P.'iC B10-321-3GG7 P-4

INDUSTRIAL HYGIENE ENVIRONMENTAL TESTING PSC AMAILYTTIGAL BEiRVOCEB • EPA/NVLAP101262-0 ’NY DOhVNELAC 10903 •NJ DEP PAI)2D • Aim ACCREDITATION NO. 100439 • PA OEP 06-353 ■CT DPH PH.023e •NCDENR 5S9 Analytical Results for ATC Associates WorkOrder: R0209O453 Client Reference: P.S. 124M

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

Client ID: ATC-0912-I24M-S1 Lab ID: -OlA Date Sampled: 9/12/02 Matrix; Air VoL(L): 1020

Respirable Particulate Matter <50.0 <0.0490 50 N060O 09/19/2002 ADM

Silica (Quartz Total) <5.00 <0.00490 5 AIRBORNE SILICA 09/19/2002 ADM

Client ID: ATC-0912-124M-S2 Lab ID: -02.A Date Sampled: 9/12'02 Matrix; Air Vol.(L): 1020

Respirable Particulate Matter <50.0 <0.0490 50 N0600 09/19/2002 ADM

Silica (Quartz Total) <5.00 <0.00490 5 AIRBORNE SILICA 09/19/2002 ADM

Client ID: ATC-0912-124M-S3 Lab ID; -03A Date Sampled: 9/12/02 Matrix: AirVol.(L): 1020

Respirable Particulate Matter <50.0 <0.0490 50 NO600 09/19/2002 ADM

Silica (Quartz Total) <5.00 <0.00490 5 AIRBORNE SILICA 09/19/2002 ADM

Client ID: ATC-0912-124M-S4 LabID:-04A Date Sampled: 9/12/02 Matrix; Air Vol.(L): NA

Respirable Particulate Matter <50.0 50 N060O 09/19/2002 ADM

Silica (Quartz Total) <5.00 5 AIRBORNE SILICA 09/19/2002 ADM

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

General Notes. <; Less than the indicated limit of detccti an (LOD), Information not available or not applicable. Back sections were checked and showed no significant breakthrough.

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NYC-WTC_000208230