Mass Flux Strategies 20 Years On—Getting the Sand Out of the Gears

Medical Analogue Framework for Natural Remedies and Passive Risk‐Mitigation Measures in Environmental Remediation

“…Lifecycle data collection, evaluation, and CSM refinement can offer a particularly high pay‐off when applied to characterization of the natural processes of: Mass flux/discharge including consideration of processes of matrix‐mediated contaminant retardation, including matrix diffusion and contaminant sorption (Horneman et al 2017; Horst et al 2021); Physical and chemical MNA processes that are potentially substantial but less well understood. For example: abiotic mineral‐mediated degradation of chlorinated volatile organic compounds (CVOCs; He et al 2015, Horst et al 2019) and chemical and physical attenuation mechanisms for new contaminant classes such as PFAS (Newell et al 2021a, 2021b); and Biological attenuation processes that are theoretically viable but for which the relevant microorganisms and pathways are unknown. …”

“…including matrix diffusion and contaminant sorption(Horneman et al 2017;Horst et al 2021); • Physical and chemical MNA processes that are potentially substantial but less well understood. For example: abiotic mineral-mediated degradation of chlorinated volatile organic compounds (CVOCs;He et al 2015, Horst et al 2019) and chemical and physical attenuation mechanisms for new contaminant classes such as PFAS(Newell et al 2021a(Newell et al , 2021b; and • Biological attenuation processes that are theoretically viable but for which the relevant microorganisms and pathways are unknown.…”

Assessing Contaminant Mass Discharge Uncertainty With Application of Hydraulic Conductivities Derived From Geoelectrical Cross‐Borehole Induced Polarization and Other Methods

“…CMD is defined as the mass per time of contaminant passing through a control plane, downstream of the contaminant source zone, perpendicular to the groundwater flow direction (Troldborg et al., 2010). A common approach when estimating CMD is to do discrete point measurements of contaminant concentration (C) and hydraulic conductivity (K) in the control plane (e.g., Horst et al., 2021). These point values can then be interpolated across the control plane either by a geostatistical approach (e.g., Cai et al., 2011; Rønde et al., 2017; Troldborg et al., 2010, 2012), by a nearest neighbor approach (e.g., Kao & Wang, 2001) or by manually assigning a certain area to each point value (Guilbeault et al., 2005).…”