Language: English
Presenters: Richard Gill (Concawe), Markus Hjort (Concawe) and Gareth Leonard (REGENESIS)
In this webinar, our guest speakers Richard Gill, Chair of the Soil and Groundwater taskforce at Concawe and Markus Hjort, Science Associate for Water, Soil and Waste for Concawe, introduce the Concawe LNAPL Toolbox.
Understanding the behaviour of Light Non-Aqueous Phase Liquid (LNAPL) in the subsurface is complex and Concawe have compiled a unique collection of useful tools, calculators, data, and resources to help scientists and engineers better understand how to manage LNAPL at their sites. The web-based toolbox uses a three-tiered approach that provides access to over 20 different LNAPL tools (key infographics, nomographs, calculators, mobility models, videos, checklists, and other formats) with different levels of complexity and time requirements. These tools allow better understand of key questions such as:
1. How much LNAPL is present?
2. How far will the LNAPL migrate?
3. How long will the LNAPL persist?
4. How will LNAPL risk change over time?
5. Will LNAPL recovery be effective?
6. How can one estimate Natural Source Zone Depletion (NSZD)?
The LNAPL Toolbox therefore allows better understanding of the LNAPL onsite and informs the required response.
Gareth Leonard, Managing Director of REGENESIS in Europe, then briefly discusses sites on which LNAPL may be managed by NSZD or active recovery and the residual dissolved phase contamination is driving a downgradient risk. Here a PetroFix permeable reactive barrier can be used to sorb and biologically degrade the migrating plume. The mechanism of treatment is discussed, and case studies used to exemplify the remedial approach.
