抄録
On November 7, 1996, an accidental explosion of an oil storage site occurred in Thaptong village area of Pluank Daeng District, Rayong Province in the Eastern part of Thailand. More than 200, 000 liters of oil were released into an unconfined aquifer. Site characterization and natural attenuation were assessed after 4 years of spillage which purpose to develop the strategic guideline for soil and ground water in situ bioremediation treatment. The contaminated plume was located as far as 44 meters away from the accidental site. Hydrocarbons in range of C9-11 were found to contaminate in groundwater and C11-20 were trapped in the soil. No carcinogens were found in the plume at the point of exposure (POE). The main compounds of the stored fuel (BTEX) were also not found in the local ground water. EPA Hydrocarbon Spill Screening Model (HSSM) was used for site assessment and indicated that after 6 days of spillage the drainage flowed down to groundwater level. The lens forming was started after 6 days of spillage which rapidly spreading during 4 years through 23 m in distance. These simulated results are in line with DMR data and villager's interviewing data. By using and risk-based corrective action (RBCA) approach, one can be concluded that the NAPL plume is confined to the place of accident and it needs treatment during 1-3 years of spillage. After that the natural attenuation can manage by itself for treatment.
