Lead in dust results letter, Liberty Street, Mar 2003

NYC 9/11 Public Portal Document

3/19/2003 PASC - Certificate ofAnalysis Page 1 of 8

Method Blank 3rd 3rd Client ID: Blank Spike Floor-07 Floor-08 R03030259- -OIA -02A Lab No.: 009192 03 009192 03 % 009193 03 009194 03 Date Sampled: 05-Mar-2003 05-Mar-2003 Recovery 05-Mar-2003 05-Mar-2003 Component MDL Units

Total Tetrachlorodibenzofurans pg <1.2 1100 - <2.4 <1.4 Total Pentachlorodibenzofurans „

<1.5 5400 - <1.3 <1.7 Total Hexachlorodibenzofurans <1.5 11000 - <2.6 <1.5 Total Heptachlorodibenzofurans <2.8 5200 - <6.8 4.2 Octachlorodib8nzofuran <5.3 5400 - 14 6.2 Total Tetrachlorodibenzo-p-dioxins <1.5 940 - 2.2 <1.6 Total Pentachlorodibenzo-p-dioxins <1.4 2700 - <6.0 <1.4 Total Hexachlorodibenzo-p-dioxins <1.6 7700 - 4.6 <2.1 Total Heptachlorodibenzo-p-dioxins 12 2600 - 31 5.9 Octachlorodibenzo-p-dioxin 38 5300 - 130 41 Internal Recoveries 2,3,7,8-T4CDF-13C12 80 77 - 80 81 2,3,7,8-T4CDD-13C12 88 82 - 86 93 1,2,3,7,8-P5CDF-13C12 86 92 - 76 81 1,2,3,7,8-P5CDD-13C12 85 83 - 72 75 1,2,3,4,7,8-H6CDF-13C12 100 91 - 91 97 1,2,3,6,7,8-H6CDD-13C12 97 88 - 84 91 1,2,3,4,6,7,8-H7CDF-13C12 114 101 - 89 100 1,2,3,4,6,7,8-H7CDD-13C12 111 97 - 82 96 OCDD-13C12 96 87 - 73 84

• 2,3,7,8-C14-Dibenzofuran (DB5) Pg <1.2 1100 107 <3.5 <1.4 2,3,7,8-C14-Dibenzo-p-dioxin <1.5 940 111 <2.4 <1.6 1,2,3,7,8-C15-Dibenzofuran A <1.5 2800 107 <1.3 <1.7 2,3,4,7,8-C15-Dibenzofuran <1.5 2700 103 2.0 <1.7 1,2,3,7,8-C15-Dibenzo-p-dioxin <1.4 2700 102 <1.6 <1.4 l,2,3,4,7,8-C16-Dibenzofuran <1.4 2600 105 <2.4 <1.4 1,2,3,6,7,8-C16-Dibenzofuran <1.4 2500 111 <1.2 <1.3 2,3,4,6,7,8-C16-Dibenzofuran <1.6 2600 104 <1.4 <1.5 1,2,3,7,8,9-C16-Dibenzofuran <1.9 2800 104 <1.6 <1.8 1,2,3,4,7,8-C16-Dibenzo-p-dioxin <1.5 2600 107 <1.3 <2.0 1,2,3,6,7,8-CI6-Dibenzo-p-dioxin <1.7 2500 94 <1.5 <2.2 1,2,3,7,8,9-C16-Dibenzo-p-dioxin <1.6 2600 107 <1.4 <2.0 1,2,3,4,6,7,8-C17-Dibenzofuran <2.5 2600 102 <6.0 4.5 1,2,3,4,7,8,9-C17-Dibenzofuran <3.3 2600 101 <7.2 <2.8 1,2,3,4,6,7,8-C17-Dibenzo-p-dioxin 6.0 2600 103 14 5.9 1,2,3,4,6,7,8,9-C18-Dibenzofuran <5.3 5400 102 14 6.2 1,2,3,4,6,7,8,9-C18-Dibenzo-p-dioxin 38 5300 106 130 41

2,3,7.8-TCDF (DB225) Pg <5.4 - - <6.9 <2.8 Internal Recoveries 2,3,7,8-TCDF-13C12 69 - - 71 73

•

Client:Philip Analytical Services Inc Project:JLC Environmental

NYC-WTC 000132147