BOS 200® Used to Treat LNAPL Seeps in Complex Karst Geology скачать в хорошем качестве

BOS 200® Used to Treat LNAPL Seeps in Complex Karst Geology

The Tennessee Department of Environment and Conservation’s (TDEC) Division of Underground Storage Tanks and the City of Gallatin launched a rapid clean-up to address petroleum contamination seeping into Town Creek Greenway and nearby residential areas. Their goal was to stop impacted groundwater from entering the creek and identify contamination sources. The project team performed a data gap analysis involving historical research, site inspections, and testing of underground storage tanks and pipes at five gas stations upgradient of the seeps. By using these findings and implementing a remedial design characterization (RDC), the project team was able to map contaminant pathways in the area’s karst geology. The RDC included dye tracing, surface geophysics, rock coring, well installations, and targeted soil and groundwater sampling. Interim remediation involved injecting BOS 200® into both bedrock and epikarst features to intercept migrating groundwater and address secondary sources. Cleanup goals were met in all three principal areas (creek seeps, triangle field seeps, and residential property seeps). Petroleum discharges and odors have been eliminated and groundwater BTEX levels are now below Federal MCLs in all target areas. A TDEC Storymap highlights project progress. With only final abandonment and restoration remaining, the project is set for a No Further Action (NFA) designation.