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Airborne silica analysis order form, EMSL Analytical Inc., Apr 2003

Machine-extracted title · confidence 90%

Laboratory order form for analyzing airborne crystalline silica samples collected from 114 Liberty Street.

NYC-WTC_000100712–000100721

Folder label: “114 LIBERTY STREET 1001041, 52/7502

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NYC 9/11 Public Portal Document

4/15/03 PASC - Certificate ofAnalysis Page 6 of 9

8th 9th 9th 9th Client ID: Floor-03 Floor-01 Floor-02 Floor-03 Lab No.: 013674 03 013675 03 013676 03 013677 03 Date Sampled: 29-Mar-2003 29-Mar-2003 29-Mar-2003 29-Mar-2003 Component MDL Units

Total Tetrachlorodibenzofurans pg <2.9 9.6 5.1 3.3 Total Pentachlorodibenzofurans <3.6 <7.5 <3.9 13 Total Hexachlorodibenzofurans <1.4 <3.8 2.5 8.3 Total Heptachlorodibenzofurans <1.5 4.6 <5.4 <3.5 Octachlorodibenzofuran <1.9 950 5.1 4.1 Total TetrachIorodibenzo-p-dioxins <2.5 37 7.3 26 Total Pentachlorodibenzo-p-dioxins <3.6 <14 <6.0 12 Total Hexachlorodibenzo-p-dioxins <4.9 3.3 16 18 Total Heptachlorodibenzo-p-dioxins <2.6 20 5.8 <4.5 Octachlorodibenzo-p-dioxin 7.0 61 27 13 Internal Recoveries % 2,3,7,8-T4CDF-13C12 76 77 73 83 2,3,7,8-T4CDD-13C12 77 81 80 92 1,2,3,7,8-P5CDF-13C12 79 73 79 87 1,2,3,7,8-P5CDD-13C12 84 80 87 94 1,2,3,4,7,8-H6CDF-13C12 91 76 87 103 1,2,3,6,7,8-H6CDD-13C12 87 80 85 101 1,2,3,4,6,7,8-H7CDF-13C12 90 , 70 85 102 1,2,3,4,6,7,8-H7CDD-13C12 90 67 86 105 OCDD-13C12 76 51 71 88

2,3,7,8-C14-Dibenzofuran (DB5) pg <2.9 <9.5 5.1 <3.8 2,3,7,8-C14-Dibenzo-p-dioxin <2.5 <4.4 <4.2 <1.7 l ,2,3,7,8-C15-Dibenzofuran <3.6 <7.5 <3.9 <1.4 2,3,4,7,8-C15-Dibenzofuran <3.7 <7.6 <4.0 2.5 1,2,3,7,8-C15-Dibenzo-p-dioxin <3.6 <5.4 <5.7 <1.5 1,2,3,4,7,8-CI6-Dibenzofuran <1.3 <2.3 2.5 2.0 1,2,3,6,7,8-C16-Dibenzofuran <1.2 <2.3 <1.3 1.7 2,3,4,6,7,8-CI6-Dibenzofuran <1.5 <2.7 <1.5 1.8 1,2,3,7,8,9-C16-Dibenzofuran <1.6 <2.9 <1.6 <1.5 1,2,3,4,7,8-CI6-Dibenzo-p-dioxin <2.2 <2.4 <2.3 <1.4 1,2,3,6,7,8-CI6-Dibenzo-p-dioxin <2.2 <2.4 <2.3 1.6 1,2,3,7,8,9-CI6-Dibenzo-p-dioxin <2.1 <2.3 <2.2 <1.6 1,2,3,4,6,7,8-C17-Dibenzofuran <1.4 <52 <4.7 <3.2 1,2,3,4,7,8,9-C17-Dibenzofuran <1.8 <4.1 <1.5 <2.5 1,2,3,4,6,7,8-C17-Dibenzo-p-dioxin <2.6 11 <6.0 <4.5 1,2,3,4,6,7,8,9-C18-Dibenzofuran <1.9 950 10 4.1 1,2,3,4,6,7,8,9-C18-Dibenzo-p-dioxin 7.0 61 27 13

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

Preliminary Report Client:Philip Analytical Services Inc Project:JLC Environmental

NYC-WTC 000100717

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NYC-WTC_000100717Source: NYC Law Department, mirrored locally

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