Integrated geophysical characterization of the Winthrop Landfill Southern Flow Path, Winthrop, Maine

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Abstract

The U.S. Geological Survey (USGS), in cooperation with United Technologies Corporation, used an integrated suite of borehole, surface, and water-borne geophysical methods near the site of the former Winthrop Landfill, Winthrop, Maine, to investigate the hydrogeology controlling the transport of leachate from the landfill to nearby Annabessacook Lake. During the fall of 2000 and summer of 2001, the USGS conducted borehole electromagnetic (EM) induction and gamma logging, and inductive terrain-conductivity, two-dimensional (2D) resistivity, continuous seismic reflection, and magnetic surveys.

The objectives of this integrated geophysical study were to provide constraints on the location and extent of the southern flow path(s) of contamination from the landfill to the lake; identify shoreline seep geophysical signatures; identify potentially hidden seeps in the lake; and determine depth to bedrock below Annabessacook Lake in the study area.

Interpretation of surface 2D resistivity, magnetic, and inductive terrain-conductivity data and borehole EM logs delineates an electrically conductive anomaly consistent with a leachate plume moving from the current landfill boundary southward through the overburden to the shores of Annabessacook Lake. Surface and borehole geophysical data collected south and southeast of the landfill indicate the presence of discrete, shallow conductive anomalies at the southeastern edge of the landfill and near the lakeshore. The conductive anomalies appear at increasing depths closer to the lake. Magnetic anomalies offshore confirm the presence of iron-rich landfill leachate discharging into the lake south of the landfill. High-resolution swept-frequency seismic data used to map sediment and grain size distribution in the lake sub-bottom along the shoreline identified sediment-infilled bedrock lows that may act as conduits for contaminant migration.

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Additional publication details

Publication type Conference Paper
Publication Subtype Conference Paper
Title Integrated geophysical characterization of the Winthrop Landfill Southern Flow Path, Winthrop, Maine
Language English
Publisher Environmental and Engineering Geophysical Society
Contributing office(s) Office of Ground Water, WMA - Earth System Processes Division
Description 22 p.
Larger Work Type Book
Larger Work Subtype Conference publication
Larger Work Title Proceedings: Symposium on the application of geophysics to engineering and environmental problems
Conference Title Symposium on the application of geophysics to engineering and environmental problems
Conference Location Las Vegas, NV
Conference Date February 10-14, 2002
Country United States
State Maine
City Winthrop
Other Geospatial Winthrop Landfill
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