A study on the characteristics of groundwater contamination of the Nanji landfill and its surrounding hydrogeologic system

Abstract

The Nanji landfill causes a serious adverse affect to nearby groundwater and surface water systems due to that it has been constructed on the very permeable and valnerable sand and gravel deposit without installing any pollution control systems such as top cap, bottom liner, and leachate collection system.

A comprehensive rededial investigation including exploratory boring, plume detection, and site‐characterization was performed to provide the basic data for the design of the remeadial measures. As a part of the investigation, this study was conducted using 10 numbers of existing monitoring wells and a bundle type well to determine the contaminant indicators for the plume detection and to define the vertical and horizontal variations of specific contaminants via distances from the landfill.

The results clearly show that EC and temperature were a good pollution indicators and the vertical variation of specific contaminants measured in the fully screened well were 20 to 90% more than those measured at same depth in bundle type well located just 2m apart.

This paper present a cost‐effective monitoring and sampling method to define the contaminant plume and provide a basic data for remedial actions.

Key words:

• basal leachate
• condensed leachate floating layer
• BTMW