Monthly Archives: March 2012


Monitoring Water & Contaminant Fluxes in Surface, Subsurface & Hyporheic Systems

Contaminant mass flux is the measurement of the concentration and flow of contaminants from a source area, represented as mass per unit area per unit time. Contaminant flux measurements show how much, how fast, and where a contaminant is moving – more than you can get from traditional groundwater grab samples. Kirk started his presentation […]


The Effects of Heterogeneity & Delivery Methods on Remediation

To begin his presentation, Rick discussed the current trends in groundwater remediation. Over the past decade, in situ methods have greatly increased in popularity. Although the use of these approaches is growing, Rick pointed out some limitations. Geological heterogeneity is a limitation to determining hydrogeological aspects of a contaminated site, and how a reagent will […]


Treatment Performance Assessment Using Conventional Wells and Multilevel Transects

Ryan Wilson used the SABRE project to base his discussion on treatment performance assessment (PA). According to Ryan, PA is about asking questions: Is the treatment working? Why or why not? Is risk reduced? When can treatment stop? Are processes sustainable? Is sufficient mass reduced? What do trends indicate? How can we optimize treatment? How […]


Characterizing DNAPL Source Zones for Remedial Performance Assessment

Gary Wealthall gave a very informative talk on dense non-aqueous phase liquid (DNAPL) source zones. He provided an overview of the characteristics of a DNAPL zone, and tools and techniques that can be used to characterize a source zone. Because of their low solubility, high density and viscosity, DNAPLs tend to persist due to mass […]


The Capillary Fringe: Monitoring & Remediation this Neglected Zone

Jim Barker focused his discussion on how contaminants behave in the capillary fringe. The capillary fringe is the zone of soil immediately above the water table. Groundwater is pulled up from the water table by capillary action, filling the pores at the base of the zone. As a result, part of the capillary fringe can […]


Assessment of Groundwater Velocity Measurements with PVPs

Rick Devlin kicked-off the Symposium with a presentation that stressed the importance of groundwater velocity measurements, especially for contaminant hydrogeology. Through case study examples, Rick showed that measuring velocity is essential in determining the fate and transport of contaminants, which in turn, helps focus remediation efforts in the right direction. Traditional velocity estimates are based […]


Collaborating for Results

Listening to the speakers at the 2011 Symposium, it became clear that getting results requires a collaborative effort. During his presentation, Jim Barker highlighted this by introducing a combined initiative that is currently taking place in the province of Ontario. The Southern Ontario Water Consortium is a development platform for new water technologies that includes […]


Working to Quantify and Overcome Uncertainty

 The theme of this year’s Symposium was “Enhanced Monitoring and Remedial Methods for Contaminated Groundwater”. It became clear that enhancing monitoring and remedial approaches involves recognizing “uncertainty” as a factor in all contaminated site assessments. It was put forth that heterogeneity in the subsurface affects the level of uncertainty in any groundwater study – when […]