Uni-Environmental Corp. jointed with J&L Environmental Technology Ltd. and National Kaohsiung Institute of Marine Technology (“The team”) had completed the “Potential Contamination Sources Investigation Plan for 10-years-old Gas Station and Large Tank Sites, Sub-plan D”, which was contracted by Taiwan EPA. The work scopes of the Sub-plan D were conducted in three consecutive phases. In Phase I site investigation, soil gas samples were collected from tanks areas and sent to lab for analysis of volatile organic compounds (VOC). Based on soil gas testing results, 29 sites were selected for Phase II soil and groundwater investigation. During Phase II work, the team had collected 400 soil samples and 400 groundwater samples, respectively, from concerned areas in the 29 selected sites. Soil and groundwater samples were then analyzed for parameters regulated by Taiwan EPA. Comparison results of testing data revealed that the groundwater beneath eleven tank sites could have been contaminated. The team was then assigned by Taiwan EPA to conduct the Phase III identification task for those potential contaminated sites, which includes 8 gas stations and 9 large tank sites. According to test results, concentrations of soil and/or groundwater samples from seven sites were exceeding the “Controlling Standards” regulated by Taiwan EPA. Based on the contamination evaluation results, the team suggested Taiwan EPA requesting the seven confirmed contaminated sites to conduct further detail investigation and remediation tasks to control contamination situation immediately. For those sites with groundwater testing results have not yet exceeded “Controlling Standards”, further monitoring program was also recommended.

Soil, Groundwater, Soil gas, Site investigation