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NYC-WTC_000223621

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NYC 9/11 Public Portal Document biu-aiii -abbv P-* n(Jr etc uc X u: uca

f=>sc: INDUSTRIAL HYGIENE •EPA/hVLAPl012S2-0 • AIHA ACCREDITATION NO. 100433 ■NCDENR598 ENVIRONMENTAL TESTING • NY OOHNELAC10303 ‘PA DEP 06-353 ■NJOEPPAOZO • CT DPH PH-0258

ANAI.YTTCAI. SERVICES Analytical Results for ATC Associates WorkOrder: R02040369 Client Reference: 19125-0289, Silica

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

Client JU: ATC-0408-150M-S1 Lab (D; -01A Date Sampled: 4/8/02 Matrix: Filter AirVoL(L); 1020 Total Particulate Matter <50.0 <0^0490 = 50 N0500 04/15/2002 ADM

Crystalline SHiea <10.0 <0.00980 10 Crystalline Silica 04/19/2002 ADM

Client ID: ATC-0408-150M-S2 Lab ID: -02A Date Sampled; 4/8/02 Matrix: Filter AirVol.(L); 1020 Total Particulate Matter 80.0 0.0784 50 N0500 04/15/2002 ADM

Crystalline Silica <10.0 <0.00980 10 Crystalline Silica 04/19/2002 ADM

Client ID; ATC-040S-150M-S3 Lab ID: -03A Date Sampled: 4/8/02 Matrix; Filter AirVol.(L); 1020 Total Particulate Matter <50.0 <0.0490 - 50 N050O 04/15/2002 ADM

Crystalline Silica <10.0 <0.00980 10 Crystalline Silica 04/19/2002 ADM

Client ID: ATC-0408-150M-S4 Lab ID: -04A Date Sampled: 4/8/02 Matrix: Filter Air Vol.(L): 1020 Total Particulate Matter <50.0 <0.0490 50 N0500 04/15/2002 ADM

Crystalline Silica <10.0 <0.00980 10 Crystalline Silica Q4/19/2Q02 ADM

Client ID: ATC-0408-I50M.S5 Lab ID: -05A Date Sampled: 4/8/Q2 Matrix: Filter AirVol.(L):NA Total Particulate Matter <50.0 50 N0500 04/15/2002 ADM

Crystalline Silica <10.0 10 Crystalline Silica 04/19/2002 ADM

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

General Noie-i: <: 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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CITY_21MC100_002919456

NYC-WTC_000223621

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NYC-WTC_000223621Source: NYC Law Department, mirrored locally

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