ARM Geophysics Landfill Delineation

ARM conducted non-intrusive geophysical survey of a closed landfill in south-central Pennsylvania.  The closed landfill reportedly occupied approximately 8 acres of the parcel.  In order to determine the lateral and vertical extents of the closed landfill, ARM performed a geophysical survey that included two methods.  The electromagnetic conductivity (EM31) survey was utilized to delineate the lateral extent of the former landfill; and the electrical resistivity imaging (ERI) survey was used to delineate the vertical extent of the former landfill, and the relative position of the water table and degree of water saturation.

EM31 and ERI data were geo-referenced using a global positioning system (GPS) and the results of the surveys were placed on an aerial photograph.  Based on the geophysical data and subsequent soil borings, the lateral extent of the closed landfill was determined and placed on the aerial photograph.

 ARM Geophysics Landfill DelineationARM Geophysics Landfill Delineation

Based on the geophysical data, the lateral limits of the former landfill are approximately 900 feet by 350 feet, which indicates the footprint of the landfill occupies approximately 7.25 acres.  The thickness of the landfilled material ranges across the landfill; however the thickness of the landfilled material and/or low-resistivity groundwater beneath the landfilled material is generally approximately 60 feet in the center portion and tapers off to less than five feet at the edges of the landfill.

ARM Geophysics Landfill Delineation