Abstract
Electrical resistivity tomography data were acquired in proximity to the coal combustion residual landfill in an effort to image and analyze seepage pathways through the shallow residual soil and underlying karsted limestone bedrock. The water table is at a depth of more than 45 m. The most prominent subsurface seepage pathways identified on the acquired electrical resistivity tomography data are located immediately adjacent to the toe of the landfill and are attributed to stormwater run-off. The moisture content of the limestone appears to decrease gradually with increasing distance from the toe of the landfill, suggesting there is also a horizontal component of moisture flow in the subsurface. Shallow limestone with higher moisture content generally underlies or is in close proximity to anthropogenic features such as drainage ditches and clay berms that are designed to channel run-off. At one location, electrical resistivity tomography data were acquired along essentially the same traverse at different times of the year, and the resistivity of shallow limestone overall was lower on the data acquired after heavy rains.
Highlights
Electrical resistivity tomography data were acquired in proximity to the coal combustion residual landfill in an effort to image and analyze seepage pathways through the shallow residual soil and underlying karsted limestone bedrock
These findings are consistent with and support the previous interpretations presented in this paper, that the most prominent seepage pathways are a result of stormwater run-off concentrating and seeping downward at the toe of the landfill and by anthropogenic features
Electrical resistivity tomography data were acquired in proximity to a Coal combustion residual (CCR) landfill located in southwest Missouri
Summary
As part of the minimum criteria, the successful containment of CCR landfills requires a properly designed and constructed run-on/run-off control system to prevent groundwater contamination (US EPA, 2015). A run-on control system is designed to prevent tributary accretion flowing onto the active portion of CCR landfill, normally by constructing drainage ditches and diverting berms to channel away incoming flow when natural drainage of run-on is not available. A Run-off control system is designed to drain and collect direct precipitation (e.g., rainfall, melting snow) that falls onto the CCR landfill. In places where run-off tends to accumulate, such as at the toe of the landfill and in drainage ditches, moisture can seep into the subsurface, especially where bedrock is pervasively fractured and overlain by weathered permeable soil (e.g., in karst terrain) (Figure 1). The results presented provide insight into a cost-effective investigation method for landfill seepage analysis
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