| Summary: | 碩士 === 國立交通大學 === 土木工程學系 === 99 === The potential of leakage of USTs of gasoline station increases with their service life. In order to avoid serious pollution, monitoring measures are employed to provide early warning. Among the monitoring methods, soil gas and groundwater monitoring detect the leaked product directly. The pathway of leaked gasoline flows and diffuses and thus, in turn the effectiveness of soil gas and groundwater monitoring, may be affected by the existence of USTs of gasoline station. In this study, numerical simulation with the software TMVOC was performed in order to assess the effectiveness of soil gas and groundwater monitoring. The results show that both soil gas and groundwater monitoring are more effective if the site has a shallow groundwater table and the soil has higher hydraulic conductivity and lower porosity. The effectiveness of soil gas monitoring is better than groundwater monitoring in general, when soil gas and groundwater monitor well are far away leakage then the groundwater monitoring is better than soil gas.
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