NYC-WTC_000208751

NYC 9/11 Public Portal Document

ATC/J^S Measurement Data Weekly Summary February 22 to March 1, 2002

Start End Shift Highest % of % Less Analyte # Samples #of Highest % # Less than Report Report OEL Adj. Shift Adj. Analyte Job Description #NQ's % NQ's than Half Class Collected Analyses OEL Half OEL Period Period OEL OEL OEL spotter in 0.01 0.006 2/22/2002 3/1/2002 Metals 4 84 8% 16% Cadmium depression by south 46 55% 84 100% mg/m3 mg/m3 tower Pl 0.02 0.02 Diesel Exhaust Torch In depression [■ 2/22/2002 3/1/2002 Diesel Fume 7 7 50% 50% 1 14% 6 86% mg/m3 mg/m3 Particulates @5 WTC 0.06 0.024 flagger @ VI/TC 6 2/22/2002 3/1/2002 Silica 25 50 40% 83% Quartz 47 94% 47 94% mg/m3 mg/m3 LvI B1-B2-B3-B4 big crane operator in 2/22/2002 3/1/2002 Asbestos* 12 12 0.1 f/cc 27% 0.05 f/cc 54% Asbestos 0 0% 11 92% depression WTC #2

1 1 torch In depression 2/22/2002 3/1/2002 Acids 6 36 6% 6% Sulfuric Acid 31 86% 36 100% mg/m3 mg/m3 @5 WTC

Area-vesey @ ramp 2 2 2/22/2002 3/1/2002 Sulfides 14 14 1% 1% Sulfur Dioxide by 5 WTC NE 13 93% 14 100% ppm ppm corner 0.08 0.08 2/22/2002 3/1/2002 Ozone 5 5 0% 0% Ozone N/A 5 100% S 100% ppm ppm 0.025 0.017 2/22/2002 3/1/2002 Mercury 6 6 0% 0% Mercury N/A 6 100% 6 100% mg/m3 mg/m3 Carbon 25 17 Carbon Driller WTC 6 Level 2/23/2002 3/1/2002 34 34 20% 29% N/A N/A 34 100% Monoxide ppm ppm Monoxide B2 98 dBA Jack Hammer 2/23/2002 3/1/2002 Noise 32 32 90 dBA 88 dBA 101 dBA 459% Noise N/A N/A 14 44% 307% Operator WTC 6

* Excludes asbestos samples collected in abatement areas. Note: All quantification limits for the sampling methods used are well below the OELs.

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NYC-WTC_000208751