We aim to establish the synthesis of three techniques for field monitoring of the contaminants: geoelectrical imaging by Direct Current resistivity and Induced Polarisation (DCIP), Physical and BioGeochemical Characterisation (PBGC) and Compound-Specific isotope analysis (CSIA).
Non-invasive DCIP monitors the electrical properties of soil, groundwater and contaminants to produce a spatial picture of the contaminant plume and is degradation. PBGC and CSIA provides the degradation status and ongoing degradation mechanism, and also serves to calibrate the DCIP interpretation.
We will apply our concept to three PCE-contaminated sites through coupled field and laboratory studies – Kv Färgaren, Kristianstad; Hagfors and Alingsås.
Tetra- and trichloroethenes (PCE and TCE) are frequent groundwater contaminants at >18000 risk-classified contaminated sites in Sweden. The scale of this problem calls for improved site assessment and monitoring to efficiently prioritize remediation efforts. Identification and quantification of in situ degradation is of particular interest to avoid more microecologically damaging and costly remediation methods such as excavation and physical treatments. Conventional techniques are insufficient, contaminant spatial distribution may not be adequately mapped, mass balances are seldom closed, identification of key processes is elusive.