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Environmental Health - Toxic Substances

Toxics Program Remediation Activities

Borehole-Geophysical Monitoring of a Blast-Fracture Extraction Trench

Type

Performance Monitoring, Site Characterization

Location Loring Air Force Base, Maine
Partners
Technology Blast-fracture collection trench (enhanced contaminant recovery)
Contaminants Chlorinated Solvents
Description
View of test wells during blasting of the recovery trench at Loring Air Force Base, Maine. Water was ejected from wells as much as 12 to 15 meters into the air
View of test wells during blasting of the recovery trench at Loring Air Force Base, Maine. Water was ejected from wells as much as 12 to 15 meters into the air

U.S. Geological Survey scientists used borehole- and surface-geophysical methods to characterize the hydrogeology and the effects of blast fracturing an in-situ recovery trench in a contaminated fractured-bedrock aquifer located at the former fire-training area of Loring Air Force Base in Aroostook County, Maine. Borehole-geophysical methods, used in six wells at the site, included video, acoustic televiewer, heat-pulse flowmeter under nonpumping and low-rate pumping conditions, natural gamma, electromagnetic induction, fluid temperature and conductivity, caliper, deviation, and borehole radar. Borehole radar was used in a single-hole reflection configuration with directional and non-directional 60-MHz (megahertz) antennas and in a cross-hole tomography configuration with 22-MHz antennas. One surface-geophysical method, azimuthal square-array direct-current resistivity, also was used. The results of the geophysical montitoring provided a conceptual understanding of the hydrology and geology of the site and documented the effects of blast-fracturing the recovery trench.

More Information
Contact John Lane, USGS, Branch of Geophysics, Storrs, Connecticut, jwlane@usgs.gov
Publications
Links

Geophysical Methods Research

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Page Last Modified: Tuesday, 04-Aug-2015 15:47:23 EDT