NYC 9/11 Public Portal Document
a ^Liberty
Mutual.
Industrial Hygiene Air Sample Results
Summary for Weeks of 11/25 and 12/2
Highest Analyte - The analyte found in the highest concentration with respect to its occupational
exposure limit.
Highest Result - Hie concentration ofthe highest analyte.
OSHA PEL - This is the Permissible Exposure Limit (PEL) fir the highest analyte. PELs are established
by an OSHA rule-making process and are file legal occupational exposure standards.
ACGHITLV - This is the Threshold Limit Value (TLV) fir the highest analyte. TLVs are voluntary
guidelines fir occupatimial exposure which are established by the American Conference of Governmental
Industrial Hygienists, a private professional organization.
Highest Result / % of OEL - This is the percentage of the occupational exposure limit (OEL) that the
highest result represents. This is the value in the “Highest Result” column divided by the Iowa* of either
the PEL or TLV and converted to a percentage.
#of NQs - This is the number of analyses that reported that concentration as “not quantifiable” (NQ).
% of NQ - This is the percent of the total analyses which were reported as “not quantifiable”.
If you have any questions concerning this information <r would like further details about these results, feel
free to contact the Liberty Mutual Industrial Hygienist on duty @ 917-566-2576.
Mike Ramsey, CSP, CIH
Senior Industrial Hygioiist
Liberty Mutual Insurance Group
12/20/01
NYC-WTC_000149768
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