NYC-WTC_000197396

NYC 9/11 Public Portal Document nay e:u Uet J. i : i *ta B10-921-9BB7 p. 4

F’SCZ INDUSTRIAL HYGIENE ■ ePANVLAP 101262-0 ■AIHA ACCREDITATION NO. 100433 ■NC0ENR53S ENVIRONMENTAL TESTING • NY DOHINELAC 10S03 • PA D£P 06-353 ‘Tj2EPP\C2C •CT DPH PH-0238

ANALYTICAL SERVICES Analytical Results for ATC Associates WorkOrder: RO20505O0 Client Reference; 19125-0291

Analyte Concentration Limit of Test Date Analyzed Detection Method /.Analyst (Ug) • (mg/m’) ; (ppm) (ug)

Client ID: ATC-0511-M833-S1 LaljJD: -0!A Date Sampled; 5/11/02 Matrix: Filter AirVol.(L)! 1020 Total ParJcuiate Matter <50.0 <0,0490 SO NOSOO 05/15/2002 ADM

Silica (Quartz Total) <5.00 <0.00490 5 AIRBORNE SILICA 05/15/2002 ADM

Client ID: ATC-0511-M833-S2 Lai) ID: -02A Date Sampled! S/11/02 Matrix: Filter Air Vol.(L): 1020 Total Particulate Matter <50.0 <0.0490 50 N0500 05/15/2002 ADM

Silica (Quartz Tola!) <5.00 <0.00490 5 AIRBORNE SILICA 05/15/2002 ADM

Client ID: ATC-05I I-M833.S3 Lab ID: -03A Date SampSttl: 5/11/02 .Matra: Filter AirV<»l.{L): 1020 Total ParticLilate Matter <50.0 <0.0490 50 N050C 05/15/2002 ADM

Silica (Quartz Total) <3.00 <0.00490 5 AIRBORNE SILICA 05/15/2002 ADM

Client ID; A'fC-051 i-M8j3-S4 Lab ID: -04A n.ite Sampled: S/l 1/02 Matrix; Filler AirVol,(L): NA 1 Ola! Particulate Matter <50.0 SO N0500 05/15/2002 ADM

Silica (Quartz Total) <5.00 5 AIRBORNE SILICA 05/15/2002 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 (LOD). Information not available or not applicable. Back sections were checked and showed no significant breakthrough.

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NYC-WTC_000197396