Integration of HAZID and Thermal Modeling Processes into Thermal Remediation Design at an Active Automotive Plant in Japan

摘要

Background/Objectives. The site is an automotive parts manufacturing facility approximately 20 kilometers northeast of Nagoya, Japan, and has been in operation since 1967. Certain plant operations used chlorinated solvents in the parts manufacturing process. Approximately 20 tons (14,000 liters) of trichloroethylene (TCE) was used annually for at least 10 years (1985-1995). Subsurface investigations identified significant impacts, including likely DNAPL accumulations, to soil and groundwater. The site cleanup drivers include: (1) TCE source zone cleanup in Aquifers 1 and 2 to the maximum extent practicable within the 5 mg/L groundwater concentration contour; (2) implement cleanup within a short time period (1 to 2 years); (3) minimize disruption to current facility operations; and (4) mitigate potential hazards associated with implementation of steam enhanced remediation (SER) aided by a robust Hazard Identification (HAZID) and thermal modeling process. The surrounding land use consists of mixed industrial, commercial, agricultural, and residential. Site lithology consists of an upper imported fill zone from 0 to 3 meters below ground surface (m bgs) overlying a thin clay unit (Clay 1) from approximately 3 to 4 m bgs. A sandy gravel zone (Aquifer 1) extends from approximately 4 to 25 m bgs with a thin clay aquitard (Clay 2) at 15 m bgs. A clayey gravel zone (Aquifer 2) is present from 25 to 45 m bgs and clayey sand (Aquifer 3) from 45 to 100 m bgs.