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Characterization of Crystalline Bedrock Contaminated by Dense Nonaqueous Liquid
Author(s) -
Cho H. Jean,
Fiacco R. Joseph,
Daly Matthew
Publication year - 2008
Publication title -
groundwater monitoring and remediation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 47
eISSN - 1745-6592
pISSN - 1069-3629
DOI - 10.1111/j.1745-6592.2008.00191.x
Subject(s) - bedrock , borehole , hydrogeology , plume , geology , environmental remediation , groundwater , contamination , characterization (materials science) , hydrology (agriculture) , petroleum engineering , soil science , geomorphology , geotechnical engineering , ecology , physics , materials science , biology , nanotechnology , thermodynamics
A systematic hydrogeologic site characterization has been completed in a fractured rock flow system, with the objective of identifying contaminant migration and fate pathways from a historical release of 1,1,1‐trichloroethane (TCA). The study integrated hydrogeologic analysis techniques such as borehole geophysical logging, pumping test analysis, and hydrochemical facies analysis to study the impact of a dense nonaqueous phase liquid (DNAPL) in a sparsely fractured crystalline bedrock. The assessment methodology can be divided into two parts: (1) characterization of the source area, where DNAPL is acting as a residual source of TCA, and (2) characterization of the downgradient plume. Reduction in DNAPL mass in the source area has resulted in significant and sustained reductions in downgradient concentrations, suggesting that remediation of fractured crystalline bedrock contaminated with DNAPL is possible and not “technically infeasible.”