Soil Vapor Extraction and Chemical Oxidation to Remediate Chlorinated Solvents in Fractured Crystalline Bedrock: Pilot Study Results and Lessons Learned

Cho, H. Jean; Fiacco, R. Joseph; Daly, Matthew H.

doi:10.1002/rem.10022

Cited by 9 publications

(6 citation statements)

References 7 publications

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“…Instead of doing that, we propose a lagging model to simulate the flow in groundwater systems subject to the effect of noninterconnected pores. It has been known from field observations that the temporal drawdown distribution induced by pumping in a fractured aquifer may exhibit a flattening portion in the middle pumping period (e.g., Cho et al, ; Greene et al, ; Moench, ; Najurieta, ; Tiedeman & Hsieh, ). The phenomenon of having this near flat portion may be referred to as the delayed response.…”

Section: Introductionmentioning

confidence: 99%

A Lagging Model for Describing Drawdown Induced by a Constant‐Rate Pumping in a Leaky Confined Aquifer

Lin

Yeh

2017

Water Resources Research

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This study proposes a generalized Darcy's law with considering phase lags in both the water flux and drawdown gradient to develop a lagging flow model for describing drawdown induced by constant‐rate pumping (CRP) in a leaky confined aquifer. The present model has a mathematical formulation similar to the dual‐porosity model. The Laplace‐domain solution of the model with the effect of wellbore storage is derived by the Laplace transform method. The time‐domain solution for the case of neglecting the wellbore storage and well radius is developed by the use of Laplace transform and Weber transform. The results of sensitivity analysis based on the solution indicate that the drawdown is very sensitive to the change in each of the transmissivity and storativity. Also, a study for the lagging effect on the drawdown indicates that its influence is significant associated with the lag times. The present solution is also employed to analyze a data set taken from a CRP test conducted in a fractured aquifer in South Dakota, USA. The results show the prediction of this new solution with considering the phase lags has very good fit to the field data, especially at early pumping time. In addition, the phase lags seem to have a scale effect as indicated in the results. In other words, the lagging behavior is positively correlated with the observed distance in the Madison aquifer.

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Section: Introductionmentioning

confidence: 99%

A Lagging Model for Describing Drawdown Induced by a Constant‐Rate Pumping in a Leaky Confined Aquifer

Lin

Yeh

2017

Water Resources Research

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“…At that time, 21 m 3 of Fenton's Reagent solution was injected into the source area, resulting in a reduction of the average source area TCA concentration by 40% (Cho et al 2002b). We have observed this at the site following pilot-scale source abatement activities in 1999 and 2000.…”

Section: Discussionmentioning

confidence: 69%

“…We have observed this at the site following pilot-scale source abatement activities in 1999 and 2000. At that time, 21 m 3 of Fenton's Reagent solution was injected into the source area, resulting in a reduction of the average source area TCA concentration by 40% (Cho et al 2002b). As a consequence of source area concentration reductions, downgradient plume concentrations have been steadily dropping over time (Figure 8).…”

Section: Discussionmentioning

confidence: 99%

Characterization of Crystalline Bedrock Contaminated by Dense Nonaqueous Liquid

Cho¹,

Fiacco²,

Daly³

2008

Groundwater Monitoring Rem

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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.”

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“…PAH compounds are hydrocarbons, with their ultimate oxidation products being water and carbon dioxide. Hydrogen peroxide has been used for removing PAHs and other hydrocarbon-based compounds in the treatment of contaminated land and groundwater (e.g., Chapelle, 1999;Cho, Fiacco, & Daly, 2002), and consequently it was believed that it would be effective in this situation.…”

Section: First Treatmentmentioning

confidence: 99%

Lessons Learned About the Nature of Groundwater Contamination by PAHs: A Case History–Based Discussion

Brassington

2013

Remediation Journal

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Observations taken during the investigation and remediation of a water supply borehole contaminated by polycyclic aromatic hydrocarbons (PAHs) are used to discuss how existing methods can define such contamination. In this example, the PAH originated from carbon black used in a manufacturing process. The extent of the contamination was investigated and the flow path for the pollutants to enter the borehole identified. Two attempts were made to destroy the contaminants using hydrogen peroxide following different procedures. The observations made during the investigations, treatment, and sampling results are reviewed to determine possible explanations for the observed behavior and to assess the effectiveness of the treatment methods with the benefits of hindsight. O

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Soil Vapor Extraction and Chemical Oxidation to Remediate Chlorinated Solvents in Fractured Crystalline Bedrock: Pilot Study Results and Lessons Learned

Abstract: A pilot study was completed at a fractured crystalline bedrock site using a combination of soil vapor extraction (SVE)

Cited by 9 publications

References 7 publications

A Lagging Model for Describing Drawdown Induced by a Constant‐Rate Pumping in a Leaky Confined Aquifer

A Lagging Model for Describing Drawdown Induced by a Constant‐Rate Pumping in a Leaky Confined Aquifer

Characterization of Crystalline Bedrock Contaminated by Dense Nonaqueous Liquid

Lessons Learned About the Nature of Groundwater Contamination by PAHs: A Case History–Based Discussion

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