Use Of Geophysical Methods To Refine Geological Site Characterization At An Eastern Nebraska Landfill - A Case History

The goal of this project was geological site characterization of a closed landfill in eastern<br>Nebraska. Geologic characterization is essential to the interpretation of the spatial<br>distribution of aquifer characteristics. The desired final result of the geological<br>characterization was collection of sufficient data to locate monitoring wells for long-term<br>study of ground water quality.<br>A phased approach of geological characterization was conducted at the site. The first phase<br>consisted of a detailed review of the existing geologic data. Included in this review were<br>regional geologic references, data from geotechnical borings in and adjacent to the landfill<br>area, driller’s logs and water level data from nearby irrigation and water wells, and limited<br>surface exposures. This review resulted in the development of a preliminary five-layer<br>geologic model and identification of obvious data gaps.