The research presented in this report is the second project of ongoing research on this subject at the University of Texas and is focused on in-situ remediation of dense chlorinated contaminants in the subsurface. The purpose of the first project was to find the most effective oxidation/reduction (redox) catalyst combination to dehalogenate TCE to less hazardous products. The focus of this second project is to test the selected redox catalyst, tetrasulfonated Co(II) phthalocyanine, and the reductant (Ti(III) citrate) in TCE-contaminated sand-packed columns. Laboratory evaluation of Ti(III) citrate and CoPTS included both column and batch experiments. There were three series of initial column experiments to establish operational conditions, four series of batch experiments to set chemical conditions and the final column experiment that observed successful reductive dehalogenation of DNAPL in a TCE-contaminated sand-packed column within 10-17 PV of remedial solution injected.