Field Trial of Microbially Induced Desaturation in Low Plasticity Silt

Field trials of microbially induced desaturation (MID) were conducted at two sites in Portland, Oregon. Monitoring for the two field trials was performed to evaluate the MID treatment performance and the associated subsurface desaturation. Monitoring data included seismic wave velocities measured with crosshole and downhole techniques, embedded in situ sensors, water chemistry measurements, and recovery and testing of samples for changes in soil properties. Results indicate liquefiable soil at both sites was successfully desaturated and that the desaturation persisted for at least two years post-treatment.