NYC-WTC_000196306

NYC 9/11 Public Portal Document

NYC Emergency Response Silica- Air Sampling Results at Fixed Locations Sampling Date and Time: 10/04/01 0900 to 1600

Sampling Sampling Sample Quartz Cristobalite Tridymite Date Sample No. Location Volume Matrix mg/m mg/m^ mg/m^ Liters 10/4/2001 05027 A 1000 Air <0.01 <0.01 <0.01 10/4/2001 05028 B 1000 Air <0.01 <0.01 <0.01 10/4/2001 05030 C1 1000 Air <0.01 <0.01 <0.01 10/4/2001 05031 D 1000 Air <0.01 <0.01 <0.01 10/4/2001 05034 E 1080 Air <0.009 <0.009 <0.009 10/4/2001 05032 p 1000 Air <0.01 <0.01 <0.01 10/4/2001 05033 s 1000 Air <0.01 <0.01 <0.01 10/4/2001 05025 TAGA 1000 /Mr <0.01 <0.01 <0.01 10/4/2001 05026 TAGA 1120 Air <0.009 <0.009 <0.009 10/4/2001 05029 Loc 3 SW WTC 5 1000 Air <0.01 <0.01 <0.01 coc# 04083

Sampling Locations: NS: Not sampled A; NE corner of West Broadway & Barclay B: SE comer of Church & Dey St. C: Trinity (a.k.a. Church) & Liberty Cl: SW corner of Broadway & Liberty St. D; East end of Albany St. at Greenwich St. E: Western end of Liberty St. at South End Ave F: Northern median strip of Vesey & West St ERT 10/18/01 9.50 AM G: Church and Duane St. H: South side of Chase Manhattan Plaza at Pine St. I: SE comer of Wall St. & Broadway J: NE corner of Warren & West St. K: West St. & Albany in median strip L: On walkway toward North Park rec area (north side of Stuyvesant High), access to TAGA bus area M; Western end of Harrison St. at West St. (on tree next to bulkhead) N: South side of Pier 25 (next to volleyball court) Q P: NE comer of South End Ave. & Albany Q; Barclay & West St. (center island) in proximity to USCG command post H K R: TAGA Bus Location I S: Rector & South End I—i S o o NIOSH 7500; Silica crystalline by XRD o I o o o co co FL-10-04-01 silica (JI

NYC-WTC_000196306