Abstract
The subsurface was contaminated by about 3,000l, of kerosine that percolated into the ground from a corroded subsurface pipeline in M City. Along with remediation of the contaminated groundwater mainly by pump-and-treat, investigations of lithology, groundwater flow systems, and groundwater chemistry were performed. A series of pumping tests was conducted throughout a two-year remediation period and the drawdown data were analyzed using a graphical method based on Neuman's analytical solution for pumping tests in unconfined aquifers. The analysis revealed that hydraulic conductivities and storage-related parameters were highly affected by the leakage of the kerosine, in particular during the first year after the leakage occurred. The objective of this paper is to show temporal changes in these hydrogeologic properties due to clogging of aquifer pores, which are deduced to be caused by the entrapment of liquid kerosine in pore spaces, the growth of bacterial cells, and the precipitation of inorganic solids.
