This case study reviews a retail petroleum station with a petroleum hydrocarbon plume in groundwater originating from the UST pit and extending offsite across a roadway and onto another commercial property. After evaluating a range of remedial options, the environmental consultant CGRS specified PetroFix as the most economically feasible option to quickly remediate the benzene plume and achieve site closure. Prior to the PetroFix treatment, CGRS performed numerous remediation activities between 2003 and 2019, including, excavation, air sparge system pilot testing, soil vapor extraction, in-well oxygen diffusion systems, pilot and/or full scale injections of carbonbased and chemical oxidizing mixtures. The combination of these remediation activities substantially reduced much of the soil and groundwater contaminant mass over time. However, the overall magnitude and extent of the benzene plume persisted above the site closure objectives, prompting further remediation. CGRS worked directly with REGENESIS to design the in situ remediation.

gas station

Case study highlights:

  • PetroFix is chosen as the final remediation solution to achieve site closure
  • Low injection pressures maintained throughout the application
  • With 99% benzene plume reduction maintained, the site is positioned to achieve closure status