NYC-WTC_000205512

NYC 9/11 Public Portal Document

Measurement Data Weekly Summary February 2 to February 8, 2002

start End Highest % # Less % Less Report Report # Samples #of Highest Shift Adj. of Shift Job than Half than Half Period Period Analyte Class Collected Analysis OEL % OEL OEL Adj. OEL Analyte Description #NQ's-' % NQ's OEL OEL Laborer Hand Jack Hammering 2/4/2002 2/8/2002 Silica 16 32 0.05 2200.00% 0.025 4583% Quartz WTC6 26 81% 28 88% Haul truck operator in Diesel Exhaust depression Tower 2/4/2002 2/8/2002 Diesel Fume 8 8 0.02 117.50% 0.02 118% Particulates #1 0 0% 5 63% Spotter in depression N. 2/4/2002 2/8/2002 Asbestos 17 17 0,1 43.00% 0.05 86% Asbestos Tower VI7 1 6% 17 100% Torch Cutter in Depression South 2/4/2002 2/8/2002 Acids 5 30 1 35.70% 1 1% Sulfuric Add Tower 1 26 83% 30 100% Torch in Depression @ 2 2/4/2002 2/8/2002 Ozone 6 6 0.08 20.69% 0.08 21% Ozone WTC 6 83% 6 100% Torch cutter in depression on 2/4/2002 2/8/2002 Metals 7 146 0.002 13.54% 0.001 1% Cadmium level B1 76 52% 140 97% Spotter by exit 2/4/2002 2/8/2002 Sulfides 10 10 2 1.25% 2 1% Sulfur Dioxde from Vesey St 9 90% 10 100% Spotter on Surface at Church 2/4/2002 2/8/2002 Mercury 7 7 0,025 0.96% 0.017 1% Mercury & Vesey 7 100% 7 100%

(400% Dose) Auto jackhammer 2/2/2002 2/8/2002 Noise 14 14 90 dBA 100 dBA n/a n/a Noise operator n/a n/a 10 71%

25 TWA 244% TWA Carbon Torch cutter at B1 2/2/2002 2/8/2002 Carbon Monoxide 16 16 200 Peak 153% Peak 17 359% Monoxide level of WTC 6 n/a n/a 13 76%

Notes:

* All Quantification levels for the sampling methods used were well below OELs. o

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NYC-WTC_000205512