NYC-WTC_000220164

NYC 9/11 Public Portal Document

Liberty Mutual / ATC Sample Measurement Data Weekly Summary

Sian Report End Report Analyte #Sam #Anaty High% High % Job Period Period Class pies sis TLV TLV PEL PEL Analyte Description #NQ's % NQ's Comment Hummering 12/29/2001 1/4/2002 concrete on 7:00:00 AM 7:00:00 PM Silica 8 18 O.OS 680% 0,61578 388% Quartz cable pit ib 89% Depression 12/29/2001 1/4/2002 on ramp & 7:00:00 AM 7:00:00 PM Ozone 4 5 0.08 21% 0.1 17% Ozone road by Tower 5 100% Grappler 12/29/2001 1/4/2002 Operator 2 7:00:00 AM 7:00:00 PM Aldehydes 4 16 0.3 9% 0.75 4% Formaldehyde WTC 6 38% Depr-E 12/29/2001 1/4/2002 Section of Twr 7:00:00 AM 7:00:00 PM Acids 3 18 1 6% 1 6% Sulfuric Acid 2 by trucks 14 78% Spotter In 12/29/2001 1/4/2002 depression - 7:00:00 AM 7:00:00 PM Metals 4 68 2 8% 5 3% Calcium In Tower #1 37 54% in Depression 12/29/2001 1/4/2002 South of 7:00:00 AM 7:00:00 PM Total PAH 2 28 0.2 5% 0.2 5% Tower#2 5 18% Comer of 12/29/2001 1/4/2002 Ground 0; W 7:00:00 AM 7:00:00 PM Special 21 28 2 2% 5 1% Sulfur Dioxide St by 28 100% Labor on 12/29/2001 1/4/2002 Hydrogen Gate Ent. SW 7:00:00 AM 7:00:00 PM Sulfides 6 11 10 1% 20 1% Comer Sewer 9 82% Cutter in 12/29/2001 1/4/2002 Depression 7:00:00 AM 7:00:00 PM Aromatics 1 4 0,5 0% 1 0% Benzene South Tower 4 100%

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NYC-WTC_000220164