Tabletop Drill
An emergency response exercise where the participants (emergency response groups, company personnel, etc.) meet in a room and discuss a particular emergency scenario.
TAME
Tertiary Amyl Methyl Ether (an organic compound used as a gasoline blending component)
TC
Toxicity Characteristics or Toxic Chemical
TCLo
Toxic Concentration Low (the lowest concentration of a material over a specific time period that will cause adverse affect(s) to health)
TCLP
Toxic Characteristics Leaching Procedure, a test used to determine whether a solid waste is also classified as a hazardous waste.
TDLo
Toxic Dose Low (the lowest dosage of a material that will cause adverse affect(s) to health)
TDG
Transportation of Dangerous Goods
TDS
Total Dissolved Solids
THC
Total Hydrocarbons
Title V
A Section of the CAA that requires major facilities to obtain an overarching air operating permit.
TLV
Threshold Limit Value (used by ACGIH and is the same as PEL which is used by OSHA)
TOC
Total Organic Compounds
TOXNET
Toxicology Data Network
Toxic Substance (TS)
A chemical or mixture that can cause illness, death, disease, or birth defects. The quantities and exposures necessary to cause these effects can vary widely. Many toxic substances are pollutants and contaminants in the environment.
TP
Toxic Pollutant
TPQ
Threshold Planning Quantity (from SARA listed materials)
TRI
Toxic Release Inventory. A database of annual toxic releases from certain manufacturers compiled from EPCRA Section 313 reports. Manufacturers must report annually to EPA, and the states, the amounts of almost 350 toxic chemicals and 22 chemical categories that they release directly to air, water, or land, inject underground, or transfer to off-site facilities. EPA compiles these reports and makes the information available to the public under the "Community Right-to-Know" portion of the law.
TSCA
Toxic Substance Control Act of 1976
TSDF
Treatment, Storage and Disposal Facility
TSI
Transportation Security Incident, a security incident resulting in significant loss of life, environmental damage, transportation system disruption or economic disruption in a particular area.
TSS
Total Suspended Solids
Turnaround
Time necessary to clean and make repairs on refinery equipment after a normal run. It is the elapsed time between shutting the process unit down and putting the unit onstream again. Sometimes referred to as a Shutdown.
TWA
Time Weighted Average