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Analysis of the Need for Soil and Groundwater Management around the Former U.S. Military Base in Yongsan Using Environmental Impact Assessment Documents

  • Journal of Environmental Impact Assessment
  • Abbr : J EIA
  • 2026, 35(5), pp.389~400
  • Publisher : Korean Society Of Environmental Impact Assessment
  • Research Area : Engineering > Environmental Engineering
  • Received : September 1, 2026
  • Accepted : October 17, 2026
  • Published : October 31, 2026

Jeong, Seung woo ORD ID 1

1국립군산대학교

Accredited

ABSTRACT

This study investigated soil and groundwater contamination and potential human exposure around the Yongsan U.S. military garrison in Seoul, focusing on the returned United Nations Command (UNC) site. It examined the need to extend environmental management beyond the returned site to adjacent residential areas. Environmental impact assessment (EIA) documents and post-project environmental impact survey reports for the UNC Site Complex Development Project were reviewed alongside publicly available groundwater monitoring data from the Seoul Metropolitan Government and Yongsan-gu. The analysis covered soil contamination and remediation history, longterm groundwater contamination around Noksapyeong Station, contaminant transport modeling conducted as part of the EIA, and recent detections of trichloroethylene (TCE) in groundwater and soil. Additional total petroleum hydrocarbon (TPH) contamination was identified at the UNC site after previous remediation, and soil contamination was again reported during construction in 2023. Around Noksapyeong Station, benzene and TPH remained detectable through 2025 despite longterm groundwater extraction, suggesting the possible persistence of residual contamination sources. EIA modeling indicated that contaminant migration from the Noksapyeong Station area toward the project site could vary depending on the hydraulic conductivity of the cutoff wall. TCE was repeatedly detected in groundwater monitoring well GW-1 in 2024, while TCE and perchloroethylene (PCE) were also identified in soil during construction. These findings warrant further investigation into the sources and migration pathways of chlorinated solvents. Volatile contaminants may migrate from soil and groundwater through soil gas and enter buildings via vapor intrusion, potentially exposing occupants to contaminated indoor air. Therefore, integrated assessments of soil, groundwater, soil gas, sub-slab gas, and indoor air are warranted in potentially affected residential areas. These findings support a long-term soil and groundwater management framework that evaluates the Yongsan U.S. military garrison, the returned UNC site, and surrounding communities within a shared hydrogeological framework.

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