| 英文摘要 |
The goal of this project is to investigate the gas stations which could have the problems of potential pollution in the underground environment.The plan is divided into three sub-plans.In Sub-plan A, there are 135 gas stations to be examined in four areas.There are four phases in the project.The result of the investigative work is summarized as the following:
1.Phase Ⅰ:Basic data collection and oil gas survey
Basic data includes “Gas station set-up data”, “UST(underground storage tank) basic data”, “piping basic data”, “reparation data”, “monitoring equipment data”, “SVE(soil vapor extraction) equipment data”, “environment data” and so on.In Phase I Investigation,we inspected 135 gas stations and 1,601 soil vapor monitoring wells with LEL detector, PID and checked the capabilities of those wells. According to the results of oil gas survey, 30 gas stations were screened to the next step (Phase II).
2.Phase Ⅱ:Oil gas and Soil gas investigation
There are 30 gas stations to enter Phase Ⅱ investigation.In Phase II Investigation, the work includes the analysis of oil gas and soil gas and the sampling of soil gas and oil gas.Base on the analyzing values of benzene, toluene, ethylbenzene, xylene and total petroleum hydrocarbons (TPH), there were 17 gas stations to be sieved out and soil and groundwater to be investigated (Phase III).
3.Phase Ⅲ:Soil and Groundwater investigation
A total of 71 soil and groundwater samples was collected and analyzed in Phase Ⅲ, following EPA methods NIEA S102.60B and NIEA W103.52B.According to the analyzing results, 6 gas stations have the soil and/or groundwater contained VOCs with concentration more than regulate levels promulgated be EPA.
4.Phase Ⅳ: identify the pollution situation
In order to confirm the pollution situation,Taiwan EPA assigned 6 gas stations to conduct the identification task.In accordance with the identification results，2 gas stations exceeded the “Groundwater Pollution Control Standards”.Taiwan EPA have to do the follow-up control according to the “Groundwater
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