Evaluation of remedial alternatives for a petroleum contaminated unconfined aquifer with fluctuating groundwater level |
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Authors: | J?Y?Lee C?H?Lee Email author" target="_blank">K?K?LeeEmail author |
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Institution: | (1) GeoGreen21 Co. Ltd., Main Building 519, Research Park, Seoul National University, 151-818 Seoul , Korea;(2) Oikos Co Ltd., Main Building 219, Research Park, Seoul National University, 151–818 Seoul , Korea;(3) School of Earth and Environmental Sciences, Seoul National University, 151-742 Seoul , Korea |
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Abstract: | This study evaluated remedial alternatives for a petroleum-contaminated site where an unconfined aquifer composed of a sandy layer of about 3–3.5 m thickness is covered by alluvial deposits and reclaimed soil of about 1.5 m thickness. Precambrian gneiss, of low permeability, lies below the sandy layer. The shallow water table is about 3 m below the surface, but shows high fluctuations of up to 1.5 m in response to precipitation events. The unsaturated soil near the water table and the groundwater are highly contaminated with petroleum hydrocarbons, especially toluene, which have apparently leaked from storage tanks. Selection of the remedial alternatives required consideration of the relevant laws on soil and groundwater conservation in Korea, the results of risk analysis and the hydrogeological conditions. The contaminated area has been divided into zones in which different remediation goals are set based on risk analysis and the degree of natural attenuation. It is estimated that the clean-up goal can be achieved in two years by the combined use of a trench drain and well point pumping to collect the contaminated groundwater for treatment, and a dual air injection system for the contaminated soil. |
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Keywords: | Remedial alternatives Petroleum Bioventing Air sparging Pump-and-treat Korea |
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