This project, an extension of the plans of previous years, focuses particularly on 400 gas stations that aged ten years or over, situated in the central and northern parts of Taiwan. The gas stations being sampled will be investigated under three sub-plans in regional groupings. The investigative method is of three phases: (1) First phase focus on the basic information collection and check of the gas station, equipment check and Soil Vapor Monitoring Well test. (2) Second phase, sampling and analysis of gases emitted from Soil Vapor Monitoring Well and the soil (3) Third phase, sampling and analysis of soil and underground water The works in each phase outlined above takes into consideration the special nature of gas stations and corresponding regulatory clauses stated within the Soil and Underground Water Pollution Remediation Act and hopes to identify gas stations which do pollute soil and underground waters. Once sources of pollution have been identified, the fourth phase of this project provides recommended immediate action and long-term corrective remediation to effectively control any further pollution, thus achieving the ethos of the Soil and Underground Water Pollution Remediation Act. This project commenced September 2003 and targeted 135 gas stations within Taoyuan-Shinchu-Miaoli regions. The first phase of basic information collection, equipment checking and Soil Vapor Monitoring Well checking has been completed. From these results, 38 gas stations were selected for phase two – sampling and analysis of gases emitted from Soil Vapor Monitoring Well and the soil. Seventeen gas stations showed non-compliance results from sample analysis and were suspected of leakage. The non-compliant gas stations were tested in concordance with phase three and final results indicate the necessity to set up monitoring wells in 11 gas stations for further confirmation of degree of pollution.

Gas Station, Soil, Groundwater, Soil Vapor Monitoring Well