Past Projects

The Walgreens property was a former retail gasoline station, which historically had leaking underground storage tanks (USTs).  Through the Florida Department of Environmental Protection (FDEP) Petroleum Preapproval Program (now known as the Petroleum Restoration Program), the staff of Terwilliger Engineering completed site assessment, pilot testing and designed an Air Sparge (AS) with Soil Vapor Extraction (SVE) system to implement continuous treatment of the subsurface soil and groundwater.  Following one (1) year of continuous treatment, the soil and groundwater were determined to be contamination-free.

The property was historically a retail gasoline station with leaking USTs, and cleanup efforts through the FDEP Petroleum Program were progressing slowly due to the deep subsurface contamination, and the continued operation of the business.  Upon closure of the business, the staff of Terwilliger Engineering was able to design a strategy to include demolition of the building and canopy, excavation of the contaminated soil to a depth of 32 feet, which included dewatering, NPDES permitting, sheet-piling, trench boxes and confirmation sampling.  Completion of the project included removal of more than 600 tons of soil and contamination-free soil and groundwater.