NYC-WTC_000220266

NYC 9/11 Public Portal Document

ATC/^JiS, Measurement Data

Weekly Summary January 25 bo 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 OEU % OEL DEL’ 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 cutler 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 0.1 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 @1WTC 7 100% 7 100% Torch Cutler in Depression SE of 1/25/2002 2/1/2002 Acids 7 42 1 4% 1 1% Sulfuric Acid Tower2 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 Toiwer2 8 100% 8 100% Hydrogen Grave/Bovis Trailer 1/25/2002 2/1/2002 Sulfides 10 10 10 1% 10 1% Sulfide 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 Peak692% Peak 17 50% Monoxide Wall N/A N/A 363% Hand Jack Hammer 1/17/2002 2/1/2002 Noise 33** N/A 90dBA (99 dBA) N/A N/A Noise 2WTC N/A N/A o H Notes;

• All Quantification levels for the sampling methods used were well below OELs. S o * The asbestos sample that was atwve 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. I ** Carbon Monoxide and noise data covers the period from 1/17 to 2/1.

1. OEL=Occupational Exposure Limit - the lower of OSHA's PEL or the ACGIH TLV. 2. Shift Adj. OEL=OEL lowere, when appropriate, to reflect 12 hr. x7 day work weeks. 3. NQ="not quantifiable*. Sufficient quantity not present to report a value.

NYC-WTC_000220266