NYC 9/11 Public Portal Document
Hillmann Environmental Group, LLC
4.2 List of Abbreviations
Hillmann Hillmann Environmental Group, LLC
PEL Permissible exposure level. This is the enforceable standard.
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ACM Asbestos containing material
PCM Phase contrast microscopy
TEM Transmission electron microscopy
PLM Polarized light microscopy
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NAD Overloaded with particulate. No asbestos detected by qualitative scan
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Overload Overloaded with particulate. Chrysotile detected by qualitative scan
NATP Not able to prepare sample because of particulate interference
f7cc Fibrous dust per cubic centimeter of air
StructJsq. mm Structures per square millimeter of filter media
FAT Final Air Test (To test for acceptable air clearance results prior to re-occupancy)
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U Marriott World Financial Center/ Project Number YI-3508
Page 11
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NYC-WTC 000131166
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