The effectiveness of natural attenuation to remediate BTEX contamination in unconfined sand/gravel aquifers: An investigation of two sites

The effectiveness of natural attenuation as a remedial approach for managing contaminated groundwater caused by two leaking underground storage tanks was evaluated. The primary indicators used to evaluate attenuation included plume characteristics and migration. Statistical analyses of the plumes of...

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Bibliographic Details
Published in:Journal of hydrology, New Zealand New Zealand, 2001-01, Vol.40 (2), p.205-217
Main Authors: Vidovich, M. M., McConchie, J. A., Schiess, S.
Format: Article
Language:English
Subjects:
Aquifers
Bioremediation
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Environmental remediation
ethyl benzene
Exact sciences and technology
Freshwater
Groundwater
Hydrocarbons
Hydrogeology
Hydrology. Hydrogeology
Oxygen
Petroleum
Plumes
Pollution, environment geology
Storage tanks
Underground storage
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Summary:The effectiveness of natural attenuation as a remedial approach for managing contaminated groundwater caused by two leaking underground storage tanks was evaluated. The primary indicators used to evaluate attenuation included plume characteristics and migration. Statistical analyses of the plumes of dissolved benzene, toluene, ethylbenzene and xylenes (BTEX), using a Mann-Kendall test, indicated decreasing contaminant concentrations. Natural attenuation rates were estimated and changes in groundwater chemistry as a result of intrinsic bioremediation of the fuel hydrocarbons were evaluated. Analysis of the data indicates that the dissolved hydrocarbons have been attenuating naturally at both sites, limiting the migration of the dissolved benzene, toluene, ethylbenzene and xylenes.
ISSN:0022-1708
2463-3933