Background

The subsoil is polluted due to former surface treatment activities of metals. The soil is contaminated with nickel and CVOC’s from just beneath the concrete slab to 4m-bgl. The source zone in the unsaturated zone has been removed. The groundwater is contaminated with nickel and CVOC’s. No DNAPL seems to be present in the saturated zone, but also no natural attenuation of the CVOC’s seems happen. There are no risks for human health and no risks for on-site ecosystem.

Challenge

What is the current residual source strength and what is the further evolution of contaminated groundwater plume? What is the overall spreading risk for Nickel and for CVOC’s?

Our solution

We used mass fluxes to determine the source and plume strengths. A groundwater and contaminant transport model has been built by Antea and is further calibrated by the iFLUX mass flux results.

We installed 2 different control planes, one in the source and one in the plume zone. Every control plane consisted of 3 to 4 clusters of respectively 3 monitoring wells at 3 different depths. A total of 44 iFLUX cartridges have been exposed.

Video

Image Source and plume strength determination of nickel and CVOC’s Image 1
Image Source and plume strength determination of nickel and CVOC’s Image 2
Image Source and plume strength determination of nickel and CVOC’s Image 3
Image Source and plume strength determination of nickel and CVOC’s Image 4
Image Source and plume strength determination of nickel and CVOC’s Image 5
Image Source and plume strength determination of nickel and CVOC’s Image 6