In October 2003, a fuel-delivery truck was involved in a crash with a dump truck.The incident occurred on US Highway 98 near the city of Newport, Florida.The crash resulted in the release of over 8500 gallons of unleaded gasoline and up to 300 gallons of diesel fuel.The emergency response contractor responded immediately to the spill and removed just over 660 tons of petroleum-impacted soil.Additional assessment, conducted by another consultant in 2005, revealed that residual contamination remained in the soil and groundwater.In 2006, Fortis was designated as the petroleum cleanup contractor for this site.
In April 2006, Fortis personnel supervised the installation of seven (7) shallow, single-cased monitoring wells and one (1) deep, double-cased monitoring well.Due to the shallow water table (less than 2 feet) and the presence of an adjacent wetland, the monitor wells were designed to be viable and accessible even in the presence of standing water.Most of the monitor wells were installed using hollow stem auger techniques; however three wells located within the wetland area were installed using a hand auger and jetting with potable water.This approach prevented unnecessary damage to the wetland area.
During the well installation, a field scientist logged the description of soils at two (2) foot intervals.Soil samples were also screened for organic compounds using an organic vapor analyzer per FDEP guidance.A full round of water table elevations were collected, and then each well was purged and sampled.The groundwater samples were analyzed using EPA Methods 8021B (BTEX and MTBE), 8270C (PAHs), and FL-PRO (TRPHs).Results indicated that petroleum constituents remained present in the surficial aquifer at concentrations above cleanup target levels.The levels were slightly above natural attenuation default concentrations and Fortis recommended monitoring for a six month period (two additional sampling events).
