This project entitled “Preliminary Assessment, Site Inspection, and Remedial Planning for Soil and Groundwater Pollution along the Erren River Basin” conducts relevant tasks of the site assessment phase. The potentially contaminated areas were delineated based on the environmental information of the Erren River Basin. Subsequently, a preliminary assessment and a site inspection were carried out so that the situation of the soil and groundwater pollution along the Erren River Basin would be thoroughly understood. Remedial planning with an additional processing strategy based on the actual experiences of home and abroad was proposed. According to the background analysis of collected data regarding the 62.5 kilometer length of the Erren River, the upstream portion of the Erren River from the conjunction of the Kang-Wei-Kuo Creek and the Erren main channel belongs to a low-pollution animal husbandry area. After being verified by this project, there was no polluted site found. Evidence has shown that this region has a low risk of soil or groundwater contamination. Therefore, the principal investigation zone of this project focused on the downstream segment of the confluence of the Kang-Wei-Kuo Creek with the Erren main channel and both tributaries of the San-Yeh Creek with the Kang-Wei-Kuo Creek which are located at highly concentrated polluted industries and potentially high pollution areas. Based on the investigation, contaminated soil of the Erren River Basin is located on the confluence of both the Kang-Wei-Kuo Creek and the San-Yeh Creek with the Erren main channel, including the three areas which are the southern district of Tainan City, Rende Township of Tainan County, and Jiading Township of Kaohsiung County. Groundwater pollution is located on the north bank of the Erren mainstream between the Kang-Wei-Kuo Creek with the San-Yeh Creek, including the southern areas of Rende Township of Tainan County. The illegal dumping of hazardous industrial waste sites are mainly located on the north shore from the confluence of the Kang-Wei-Kuo Creek with the Erren main channel to the estuary, including the southern district of Tainan City and the southern areas of Rende Township of Tainan County. Results from field soil sampling surveys of 41 investigation sites containing a total of 75 plots found that (1) 28 of the soil samples, out of 83 soil samples that were carried out and examined, were over the pollution standards; (2) two out of 15 samplings were found with groundwater pollution; and (3) eight sites had hazardous industrial waste out of 18 examined sites. Among the 41 investigated sites, eleven soil contaminated sites and two groundwater polluted sites by heavy metal and twenty-two dumping sites (seven of them are hazardous industrial waste sites) were found. Site sampling surveys and laboratory experiments from the 41 investigation sites (total of 75 plots) found that 29 plots of land involved illegal dumping (ten of them with hazardous wastes), 14 with contaminated soil, and two with polluted groundwater. A detail inspection was carried out for the three highly potentially contaminated sites and a subsequent plan for removing soil pollutants was proposed. The estimated total budget is about NT$69,803,460.

"Soil""Groundwater"