Hydrogeological investigation of a groundwater contamination site in southern Taiwan |
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Authors: | C W Liu L H Cheng |
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Institution: | (1) Department of Agricultural Engineering, National Taiwan University, Taipei, Taiwan 10617, R.O.C., TW |
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Abstract: | Groundwater samples taken from wells adjacent to a food machinery manufacturing plant in southern Taiwan indicate that there
is a serious phenolic contamination. To understand the hydrogeological properties, and to prepare for remedial action, a series
of hydrogeological investigations were conducted. Investigative work included collecting background information, analyzing
existing data, measuring the groundwater, and conducting a slug test, pumping and recovery test, aerial photography analysis
and electrical resistivity survey. Results from these investigations show that the local groundwater aquifer may be classified
as an unconfined or confined formation, depending on the thickness of the interbedded clay layer. The direction of local groundwater
flow is from southwest to northeast, with high transmissivity. The contaminant moves much more slowly than the average groundwater
velocity, and it is limited to an area centered around the plant. The local geology of the contaminated area exhibits significant
heterogeneity; it is not likely to have been formed by natural sedimentation. Data from the field aerial photography analysis
and electrical resistivity survey also suggest that this shallow formation may result from artificial back-filling.
Received: 1 September 1994 · Accepted: 28 December 1995 |
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Keywords: | Hydrogeology Slug test Pumping test Aerial photography Electric resistivity |
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