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Title: Geophysical investigation of the Grassy Island Confined Disposal Area, Detroit, Michigan
Authors: United States. Army. Corps of Engineers. Detroit District.
Lewis, Richard D.
Keywords: Confined Dredged Material Disposal Facility
Geophysical surveys
Grassy Island Confined Disposal Area
Detroit, Michigan
Dredging spoil
Geomagnetic anomalities
Soil physics
Magnetic fields
Publisher: Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; GL-91-15.
Description: Technical Report
Abstract: Geophysical surveys were conducted on a portion of the Grassy Island Confined Disposal Facility, near Detroit, Michigan, in an effort to relocate approximately 20 buried paint canisters. These containers were disposed on Grassy Island Confined Disposal Facility over 20 years ago when the location was actively used as a disposal site for dredged materiaL Four separate geophysical field surveys were conducted using two different geophysical methods, magnetics, and electromagnetics. These four surveys were (a) magnetic total field, (b) vertical gradient of the total magnetic field, (c) electromagnetic vertical dipole, and (d) electromagnetic horizontal dipole. Three of the four geophysical surveys which were performed detected the presence of a concentration of ferrous material in the subsurface. Positive electrical conductivity and magnetic anomaly was found at a depth of approximately 70 ft near the indicated place believed to be the paint canisters' burial area. This locale is believed to represent the best area for further investigations to relocate the targeted canisters.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Technical Report

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