Anaerobic Degradation of Petroleum Hydrocarbons (PHC) through Biostimulation Induced Biofilm Development
Background: Two underground storage tanks (UST), one containing heating oil, one gasoline, with incidental product releases, were removed in 1980s. Excavated soils and surface concrete returned into tank grave. Undocumented fill used to complete backfill operations with recorded pH ≤10 SU.
Hydrogeology: Geology consists of brown sandy-silt soils with varying gravel 1-5 feet (5ft) below ground surface (bgs); underlain by medium dense to very dense sandy-silts and trace gravel, extending from 5-50ft bgs. This unit supports discontinuous perched groundwater 14ft bgs within native soils and unconsolidated soil/concrete backfill. Source PHC contaminants proximate to former USTs at 4-17ft bgs, with impacts extending into native soil 16-27-ft bgs.