Groundwater Remediation: The Next 30 Years

Hadley, Paul W.; Newell, Charles J.

doi:10.1111/j.1745-6584.2012.00942.x

Cited by 45 publications

(41 citation statements)

References 16 publications

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“…For almost four decades, exhaustive amounts of research, site characterization, and remediation have been aimed at addressing chlorinated solvents in groundwater. While site characterization efforts for solvents were historically focused largely on groundwater transport, biodegradation, and VI, more recent efforts have been directed to the process of matrix diffusion and mass flux as the pertinent characteristics of groundwater contamination (Hadley & Newell, 2012;ITRC, 2010ITRC, , 2011Newell et al, 2011). With the vast knowledge base developed from these exhaustive research activities focused on chlorinated solvents, it should be possible to examine and perhaps categorize solvent sites in much the same way as the LLNL Report and, subsequently, the Policy.…”

Section: Results Of Research Not Incorporated Into Realistic Expectatmentioning

confidence: 99%

California's Low‐Threat LUFT Site Closure Policy: Looking Forward

Hadley

Arulanantham

Gandhi

2015

Remediation Journal

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California's regulatory agencies have historically been at the forefront of national efforts to address environmental concerns. In 2012, California's agency for addressing leaking underground fuel tanks (LUFTs) adopted a policy that identifies low‐threat conditions warranting closure of an LUFT case. That development clearly fulfills the role of risk management in the risk assessment–risk management paradigm inherent in environmental remediation. It also encourages identification of additional categories of sites and other circumstances that are “low threat” to develop similar guidance on closure to apply to those sites. ©2015 Wiley Periodicals, Inc.

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Section: Results Of Research Not Incorporated Into Realistic Expectatmentioning

confidence: 99%

California's Low‐Threat LUFT Site Closure Policy: Looking Forward

Hadley

Arulanantham

Gandhi

2015

Remediation Journal

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“…On the one hand, those numerous blobs have a wide spatial distribution and increase the LNAPL-water effective interfacial area, thereby expand the LNAPL plume contaminated; on the other hand, those entrapped blobs are difficulty to mobilize, and pumpand-treat remediation is not an effective cleanup method (Hadley & Newell, 2012;Essaid et al, 2015).…”

Section: The Disadvantage and Remediationmentioning

confidence: 99%

The behaviors of LNAPL migration and entrapment in a rough-walled vertical fracture

Xie

et al. 2017

Geosci J

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The migration of light non-aqueous phase liquids (LNAPLs) and their entrapment in unsaturated vertical fractures exhibit complex behaviors, such as upward LNAPL migration that follows water level rise. In this study, behavior of LNAPL migration and entrapment in a vertical rough-walled fracture was investigated with optical measurement. A series of experiments were preformed, including fracture drainage, LNAPL infiltration and accumulation in an unsaturated fracture, and upward LNAPL migration with water level rise. Experimental results indicate that the fracture aperture significantly influences the LNAPL migration path and entrapped blobs distribution. The LNAPL-filled aperture follows a normal distribution, with the mean aperture ranging 0.253 mm to 0.287 mm, and the standard deviation around 0.13 mm. The characteristics of the entrapment blob morphology indicate that 80% of the individual blob areas are smaller than 20 mm 2 . The irregular structures of discrete blobs increase the 'LNAPL-water' interface, which will exacerbate contamination.

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“…The characteristics of a residential well supplying water determine the minimum mass flux of a contaminant that could result in exceedance of the drinking water criterion. Conservative estimates of mass flux and well yield are appropriate to assure delivery of satisfactory quality groundwater (Hadley & Newell, ).…”

Section: Residential Water Supply From Groundwatermentioning

confidence: 99%

Yardsticks to Integrate Risk Assessment, Risk Management, and Groundwater Remediation

Hadley

Arulanantham

Gandhi

2015

Remediation Journal

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Remediation of contaminated sites has focused largely on restoration of groundwater aquifers. Often the stated remedial goal is to achieve conditions allowing unrestricted use and unrestricted exposure. Such total groundwater cleanup has occurred at some sites, but is the exception rather than the rule. At the same time, significant effort occurs to perform risk assessments for potential exposure to contaminants in groundwater at sites, both before and after remediation. The logical synergy between risk assessment and remediation is for risk management to seek opportunities for optimal use of groundwater based upon realistic expectations of cleanup technologies and the relevant acceptable residual (postremediation) levels of contaminants. This article explores an approach to improve this synergistic relationship between risk assessment, risk management, and remediation for groundwater cleanups. ©2015 Wiley Periodicals, Inc.

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Groundwater Remediation: The Next 30 Years

Cited by 45 publications

References 16 publications

California's Low‐Threat LUFT Site Closure Policy: Looking Forward

California's Low‐Threat LUFT Site Closure Policy: Looking Forward

The behaviors of LNAPL migration and entrapment in a rough-walled vertical fracture

Yardsticks to Integrate Risk Assessment, Risk Management, and Groundwater Remediation

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