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Abstract
A modeling investigation examined the effect of nearby buffer zone (property) boundaries on passive groundwater monitoring networks at a hypothetical landfill. Network designs considered the unknown location of a small point source in the landfill's liner, contaminant concentrations simulated in groundwater, and the need to detect a contaminant before its concentration at a buffer zone boundary reached a certain threshold. Several buffer zone boundaries were considered, ranging from 6 m to 51 m downgradient of the landfill's downgradient corner. Monitoring wells in each network were located 5 m downgradient of the landfill's downgradient boundaries. Both the minimum number of wells, and the rate of increase in number of wells, increased with proximity of the landfill's downgradient corner to the buffer zone boundary. Based on out-comes of this study, landfill designers should consider a possible need for many closely-spaced detection wells for small potential point sources and close buffer zone boundaries.
Published Version
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