Multiple Methods for Determining Stability of Attenuating MTBE Groundwater Plume

Gibbs, James T.; Williamson, Travis K. J.; Naber, Steven; Macchiarella, Thomas L.

doi:10.1061/(asce)0733-9372(2002)128:9(891)

Cited by 4 publications

(1 citation statement)

References 7 publications

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“…However, individual well trend results can often provide contradictory, fragmented, or inconclusive results on their own. With advances in computing power and the increasing size of datasets, plumewide trend estimates of center of mass, total dissolved mass, plume area, and mass distribution in a plume have been put forward as useful tools in determination of plume stability (Brauner et al, 2008;Gibbs et al, 2002;Ricker, 2008).…”

Section: Common Approaches To Evaluating Plume Stabilitymentioning

confidence: 99%

A comprehensive approach to plume stability

Vanderford

2010

Remediation Journal

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This article defines and presents a systematic approach to groundwater plume-stability assessment.Qualitative and quantitative methods that have been used to assess plume stability at National Priority List sites undergoing optimization are reviewed. Example case studies are included to illustrate the advantages of combining multiple analysis methods. Relevant statistical methods include identifying normal data distributions, detection frequencies, coefficients of variation, individual well trends, and rates of change at individual monitoring locations. Trend estimates for total plume mass and center of mass provide a broader picture of plumewide processes. Deterministic methods, such as quantitative mass-balance approaches, may be useful for larger plumes. Qualitative assessments include evaluations of the conceptual site model, source strength, attenuation mechanisms, and hydrogeology. Because groundwater plumes are always dynamic, the determination of plume stability has to include qualitative steps relating the rate and magnitude of change to the goals and objectives of the program and the time frame over which critical management decisions are to be made. The assessment of plume stability is, therefore, presented as a process that should involve both qualitative and quantitative steps for determining the acceptability of variability in groundwater contaminant concentrations. O

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Section: Common Approaches To Evaluating Plume Stabilitymentioning

confidence: 99%

A comprehensive approach to plume stability

Vanderford

2010

Remediation Journal

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Effect of Hydraulic Conductivity Contrast on Non-Pumped Wells in Backfilled Trenches for Aquifer Remediation

Hudak

2016

Water Air Soil Pollut

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Definition, Objectives, and Evaluation of Natural Attenuation

Rittmann¹

2004

Biodegradation

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Natural attenuation offers large benefits to owners and managers of contaminated sites, but often raises strong objections from those who live and work near a site and are asked to assume most of the long-term risks. Part of the controversy comes about because published definitions of natural attenuation do not identify a realistic end-point objective, and they also are ambiguous about the naturally occurring processes that can achieve the objective. According to guidance from the U.S. National Research Council (NRC 2000), destruction and strong immobilization are the naturally occurring processes that achieve a realistic objective: containing the contaminant relatively nears its source, thereby minimizing exposure risks. The strategy for obtaining solid evidence that the objective is being achieved requires measurements that establish a cause-and-effect relationship between contaminant loss and a destruction or strong-immobilization reaction. The cause-and-effect relationship is best documented with reaction footprints, which typically are concentration changes in reactants or products of the destruction or immobilization reaction. MTBE presents a contemporary example in which footprint evidence for biodegradation is especially crucial, since aerobic biodegradation of MTBE requires special conditions not present at all sites: a high availability of dissolved oxygen and bacteria expressing particular oxygenase enzymes.

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Multiple Methods for Determining Stability of Attenuating MTBE Groundwater Plume

Cited by 4 publications

References 7 publications

A comprehensive approach to plume stability

A comprehensive approach to plume stability

Effect of Hydraulic Conductivity Contrast on Non-Pumped Wells in Backfilled Trenches for Aquifer Remediation

Definition, Objectives, and Evaluation of Natural Attenuation

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