Use of electromagnetic induction methods to monitor remediation at the University of Connecticut landfill: 2004–2011

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Abstract

Time‐lapse geophysical surveys using frequency‐domain electromagnetics (FDEM) can indirectly measure time‐varying hydrologic parameters such as fluid saturation or solute concentration. Monitoring of these processes provides insight into aquifer properties and the effectiveness of constructed controls (such as leachate interceptor trenches), as well as aquifer responses to natural or induced stresses. At the University of Connecticut landfill, noninvasive, electromagnetic induction (EMI) methods were used to monitor changes in subsurface electrical conductivity that were related to the landfill‐closure activities. After the landfill was closed, EMI methods were used to monitor changes in water saturation and water quality. As part of a long‐term monitoring plan to observe changes associated with closure, redevelopment, and remediation of the former landfill, EMI data were collected to supplement information from groundwater samples collected in wells to the south and north of the landfill. In comparison to single‐point measurements that could have been collected by conventional installation of additional monitoring wells, the EMI methods provided increased spatial coverage, and were less invasive and therefore less destructive to the wetland north of the landfill. To monitor effects of closure activities on the subsurface conductivity, EMI measurements were collected from 2004 to 2011 along discrete transects north and south of the landfill prior to, during, and after the landfill closure. In general, the results indicated an overall decline in subsurface electrical conductivity with time and with distance from the former landfill. This decline in electrical conductivity indicated that the closure and remediation efforts reduced the amount of leachate that originated from the landfill and that entered the drainages to the north and south of the landfill.

Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Use of electromagnetic induction methods to monitor remediation at the University of Connecticut landfill: 2004–2011
DOI 10.4133/1.4721692
Year Published 2012
Language English
Publisher Society of Exploration Geophysicists
Contributing office(s) Toxic Substances Hydrology Program, OGW Branch of Geophysics
Description 21 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Symposium on the Application of Geophysics to Engineering and Environmental Problems 2012
First page 36
Last page 56