Brownfield site investigation using geophysics

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Authors:Holt, Jennifer Jane
Source:62p. Institution: Ohio State University, Columbus, OH, United States
Publication Date:1997
Note:In English. 6 refs. Master's thesis
Summary:Brownfields are areas in cities that have been determined to have environmental problems due to industry that once operated in those areas. There is a high probability that the area is contaminated in some way. At present, most of these areas are open tracts of land and they can not be used or cleaned up until the extent of contamination has been determined. It has been suggested that geophysics be used to conduct non-invasive site characterization to determine the extent of the contamination. Since geophysics is non-invasive it will not spread any contamination while characterizing the site. Brownfield Sites are usually located in urban areas so they have additional special problems associated with them, including overhead power lines, rebar in concrete, electrical lines in buildings, and electrical current in rail lines that often interfere with electromagnetic and magnetic measurements. All of these aspects must be taken into account in designing an effective geophysical field survey in an urban environment. A Brownfield Site in East Chicago was used to demonstrate the effectiveness of utilizing geophysics on these sites and to develop strategies for applying geophysics to site evaluation. This site contained all of the problems listed above. Part of the area was an open field and the other part had concrete pads that were part of buildings that had been taken down. To minimize the effects of cultural noise, ground penetrating radar (GPR) measurements were made along orthogonal grid lines and multi-frequency electromagnetic (EM) measurements were also made. Vertical and horizontal gradient magnetometer measurements complimented the EM and GPR measurements. Comparisons of magnetometer measurements and EM measurements proved to make it easier to evaluate the GPR measurements at the site. This is the most extensive study to date of a comparison of geophysical methods in an urban setting. The comparison of methods indicate the following: (1) there needs to be very close (one foot or less) line and station spacing, (2) instruments should be run in orthogonal directions, and (3) multiple methods should be used to get the best characterization of the sites. The Chicago site provides insight into designing other Brownfield investigations.
Subjects:Brownfields; Case studies; Definition; Electromagnetic methods; Environmental analysis; Geophysical methods; Geophysical surveys; Ground-penetrating radar; Industry; Magnetometers; Pollution; Radar methods; Surveys; Urban environment; Indiana; Lake County Indiana; United States; East Chicago Indiana
Coordinates:N411000 N414500 W0871400 W0873200
Record ID:1999011929
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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