NYC-WTC_000220192

NYC 9/11 Public Portal Document

ATC/ Measurement Data Weekly Summary January 25 to February 1, 2002

#Less Start End # Shift Highest than % Less Report Report Analyte Samples #of Highest Adj % of Shift Job Half than Half Period Period Class Collected Analysis OEL’ % OEL OEL’ Adj OEL Analyte Description #NQ's’ % NQ's OEL OEL Torch Cutter in Diesel Exhaust Depression Tower 1/25/2002 2/1/2002 Diesel Fume 6 6 0 02 215% 0 02 215% Particulates #2 0 0% 0 0% Torch cutter in depression on spot 1/25/2002 2/1/2002 Metals 10 203 0 05 116% 0 024 214% Lead of tower #2 122 60% 198 98% Spotter on surface 1/25/2002 2/1/2002 Asbestos 12 12 01 99% 0 05 198% Asbestos at4WTC 3 25% 11 92% Labor in Pit Liberty 1/25/2002 2/1/2002 Silica 7 14 0 05 50% 0 025 104% Quartz & Washington St 13 93% 13 93% Torch in depression 1/25/2002 2/1/2002 Ozone 7 7 0 08 20% 0 08 20% Ozone @ 1 WTC 7 100% 7 100% Torch Cutter in Depression SE of 1/25/2002 2/1/2002 Acids 7 42 1 4% 1 1% Sulfuric Acid Tower 2 38 90% 42 100% Torch Cutter in Depression SE of 1/25/2002 2/1/2002 Mercury 8 8 0 025 1% 0 017 1% Mercury Tower 2 3 100% 8 100% Hydrogen Grave/Bovis Trailer 1/25/2002 2/1/2002 Sulfides 10 10 10 1% 10 1% Sutfide SW Comer 10 100% 10 100% 25 TWA Carbon 200 50% TWA Carbon Core Drilling Slurry 1/17/2002 2/1/2002 Monoxide 38 * N/A Peak 692% Peak 17 50% Monoxide Wall N/A N/A 363% Hand Jack Hammer 1/17/2002 2/1/2002 Noise XX N/A 90dBA (99 dBA) N/A N/A Noise 2 WTC N/A N/A

o Notes H K * All Quantification levels for the sampling methods used were well below OELs I to ’ The asbestos sample that was above the shift adjusted OEL has been sent out to confirm that the fibers present were in fact asbestos That result is pending * The individual with the potential asbestos exposure above the shift adjusted OEL was not wearing a respirator o ** Carbon Monoxide and noise data covers the period from 1/17 to 2/1 o I o o 1 OEL=Occupational Exposure Limit the lower of OSHA's PEL or the ACGIH TLV to co 2 Shift Ad) OEL=OEL lowere when appropriate to reflect 12 hr x 7 day work weeks co co 3 NQ= not quantifiable" Sufficient quantity not present to report a value co

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NYC-WTC_000220192