Request for firebrick sealing letter, October 2002

NYC 9/11 Public Portal Document

3/11/2003, PASC- Certificate ofAnalysis Page 3 of 5

R02090951 R02090951 R02090951 R02090951 R02090951 Client ID: 08A 09A lOA llA 12A Lab No.: 060274 02 060275 02 060276 02 060277 02 060278 02 Date Sampled: I2-Sep-2002 12-Sep-2002 12-Sep-2002 12-Sep-2002 12-Sep-2002 Apartment No. & Location 2S-H 2S-F 4N-W 4N-H 4N-F Component Units Unvalidated Unvalidated Unvalidated Unvalidated Total Tetrachlorodibenzofiirans pg <1.7 Pending Pending Pending Pending Total Pentachlorodibenzofurans <1.7 Pending Pending Pending Pending Total Hexachlorodibenzofurans 1.8 Pending Pending Pending Pending Total Heptachlorodibenzofiirans <3.8 Pending Pending Pending Pending Octachlorodibenzofuran <2.5 Pending Pending Pending Pending Total Tetrachlorodibenzo-p-dioxins tt <2.0 Pending Pending Pending Pending Total Pentachlorodibenzo-p-dioxins tt <2.6 Pending Pending Pending Pending Total Hexachlorodibenzo-p-dioxins tt 1.9 Pending Pending Pending Pending Total Heptachlorodibenzo-p-dioxins tt 4.2 Pending Pending Pending Pending Octachlorodibenzo-p-dioxin 12 Pending Pending Pending Pending Internal Recoveries % 2,3,7,8-T4CDF-13CI2 71 Pending Pending Pending Pending 2,3,7,8-T4CDD-13C12 83 Pending Pending Pending Pending 1,2,3,7,8-P5CDF-13C12 70 Pending Pending Pending Pending 1,2,3,7,8-P5CDD-13C12 79 Pending Pending Pending Pending 1,2,3,4,7,8-H6CDF-13C12 90 Pending Pending Pending Pending 1,2,3,6,7,8-H6CDD-13C12 94 Pending Pending Pending Pending 1,2,3,4,6,7,8-H7CDF-13CI2 92 Pending Pending Pending Pending 1,2,3,4,6,7,8-H7CDD-13C12 97 Pending Pending Pending Pending OCDD-13C12 114 Pending Pending Pending Pending

2,3,7,8-C14-Dibenzofuran (DBS) pg <1.7 Pending Pending Pending Pending 2,3,7,8-C14-Dibenzo-p-dioxin tt <2.0 Pending Pending Pending Pending 1,2,3,7,8-C15-Dibenzofuran tt <1.6 Pending Pending Pending Pending 2,3,4,7,8-C15-Dibenzofuran <1.8 Pending Pending Pending Pending 1,2,3,7,8-C15-Dibenzo-p-dloxin <2.6 Pending Pending Pending Pending 1,2,3,4,7,8-C16-Dibenzofuran 1.6 Pending Pending Pending Pending 1,2,3,6,7,8-C16-Dlbenzofuran <0.86 Pending Pending Pending Pending 2,3,4,6,7,8-C16-Dlbenzofuran <1.0 Pending Pending Pending Pending n Pending Pending Pending 1,2,3,7,8,9-C16-Dibenzofuran <1.2 Pending 1,2,3,4,7,8-C16-Dibenzo-p-dloxin <1.4 Pending Pending Pending Pending 1,2,3,6,7,8-C16-Dibenzo-p-dioxin tt <1.4 Pending Pending Pending Folding 1,2,3,7,8,9-C16-Dibenzo-p-dioxin <1.3 Pending Pending Pending Pending 1,2,3,4,6,7,8-C17-Dibenzofuran It <3.3 Pending Pending Pending Pending 1,2,3,4,7,8,9-C17-Dibenzofuran <4.6 Pending Pending Pending Pending 1,2,3,4,6,7,8-C17-Dibenzo-p-dioxin 4.2 Pending Pending Pending Pending 1,2,3,4,6,7,8,9-C18-Dibenzofuran <2.5 Pending Pending Pending Pending l,2,3,4,6,7,8,9-C18-Dibenzo-p-dioxin 12 Pending Pending Pending Pending

2,3,7,8-TCDF (DB225) pg Pending Pending Pending Pending Pending Internal Recoveries % 2,3,7,8-TCDF-13C12 Pending Pending Pending Pending Pending

ClientPhilip Analytical Services Inc Project:Misc.

NYC-WTC_000163565