Brown Environmental responded to an emergency call due to an overfilled fuel oil underground storage tank at the Morrisville Distribution Center. Site characterization activities indicated that soil concentrations exceeded the applicable statewide health standard surrounding the active underground storage tank systems. An in-situ bioremediation system was designed, permitted and applied onsite while the tank systems remained in use. Concentrations were reduced to below the applicable Statewide Health Standard and liability protection under the PA Land Recycling Program was secured by the responsible party.