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Clayey tills contaminated with chlorinated solvents are a threat to groundwater and are difficult to remediate. Full scale Enhanced Reductive Dechlorination (ERD) and In-Situ Chemical Oxidation (ISCO) are promising remediation technologies for such sites, but the delivery of reactants is challenging due to mass transfer limitations in such low-permeability media. A numerical model is used to investigate the influence of three controlling parameters (injection intervals, thickness of active zones and reaction kinetics) on the expected mass removal in order to assess timeframes for remediation.