EPA Proposes Short-term Limit on TCE Exposures
The U.S. EPA has made a remarkable decision recently to protect the health of people exposed to trichloroethylene (TCE) in indoor air, primarily as a result of vapor intrusion of TCE vapors from groundwater. The Region 9 EPA has proposed a Remedial Action Level (RAL) for acute (short term) exposure to TCE of 15 micrograms per cubic meter (ug/m3) or 2.8 parts per billion by volume (ppbv). RALs are developed to protect residents exposed to chemicals in indoor air. The regional EPA staff is awaiting approval from EPA headquarters. This