HR: 0830h
AN: H31B-0461    [PDF]
TI: 3D Inversion of Induced Polarization Data From Borehole Measurements to Map Subsurface Contaminations of Tetrachloroethylene and Trichloroethylene.
AU: * Briggs, V A
EM: vbriggs@mit.edu
AF: Earth Resources Laboratory M.I.T., 42 Carleton Street, Cambridge, MA 02139 United States
AU: Sogade, J
EM: sogade@erl.mit.edu
AF: Earth Resources Laboratory M.I.T., 42 Carleton Street, Cambridge, MA 02139 United States
AU: Minsley, B
EM: minsley@mit.edu
AF: Earth Resources Laboratory M.I.T., 42 Carleton Street, Cambridge, MA 02139 United States
AU: Lambert, M
EM: mbl@mit.edu
AF: Earth Resources Laboratory M.I.T., 42 Carleton Street, Cambridge, MA 02139 United States
AU: Coles, D
EM: dac@mit.edu
AF: Earth Resources Laboratory M.I.T., 42 Carleton Street, Cambridge, MA 02139 United States
AU: Repert, P
EM: reppert@erl.mit.edu
AF: Earth Resources Laboratory M.I.T., 42 Carleton Street, Cambridge, MA 02139 United States
AU: Morgan, F
EM: morgan@erl.mit.edu
AF: Earth Resources Laboratory M.I.T., 42 Carleton Street, Cambridge, MA 02139 United States
AU: Rossabi, J
EM: joseph.rossabi@srs.gov
AF: Westinghouse Savannah River Company, Savannah River Site Bldg 773-42A, Aiken, SC 29808 United States
AU: Riha, B
EM: brian.riha@srs.gov
AF: Westinghouse Savannah River Company, Savannah River Site Bldg 773-42A, Aiken, SC 29808 United States
AB: The purpose of this study is to image contaminant plumes of tetrachloroethylene (PCE) and Trichloroethylene (TCE) in a subsurface environment. PCE and TCE have been used in the metals fabrication industry since the start of the second word war and subsequently millions of tons of these chemicals have been released in to the environment. Once in the water supply these contaminants are difficult to remove and can be toxic at the part per billion level. Remediation at the source of many of these contaminated sites, in the form of vapour extraction, can effectively remove alot of the chemicals but without techniques to delineate the size and shape of the contaminated zone, or to monitor the effectiveness of the remediation effort, it is difficult to quantify the remediation success. Using complex resistivity methods it is possible to determine the spatial extent and concentration of these chemicals due to their effect on the pore space chemistry. Even at parts per billion the contaminantas can significantly alter the IP signature enabling detection. Data were collected from a site in South Carolina where these chemcals are known to have been released in large quantities from the 1950's through to the 1980's. Induced Polarization data were measured in a multi-borehole environment to ensure good data coverage. Data is inverted using a 3D finite difference bi-conjugate gradient method and correlated to ground truth boreholes within the region of interest.
DE: 1871 Surface water quality
DE: 3210 Modeling
DE: 5109 Magnetic and electrical properties
DE: 5194 Instruments and techniques
SC: Hydrology [H]
MN: 2003 Fall Meeting