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Background

This site formerly dispensed gasoline and had three 6,000 gallon USTs in use at the facility. During an annual storage tank site inspection in 2007, the report noted that the middle tank (UST-2) failed a tightness test and exhibited product loss. A further report determined that 1,000 gallons of fuel was discharged from this tank which was then taken out of service. Further assessments determined that free product was present in the water table.

Following this conclusion, soils were excavated during tank removal and a bioremediation system was installed and operated from 2012 to 2015. During the 1st quarter of 2015, this system was removed and groundwater monitoring began in preparation for a remedial action plan (RAP) modification. The RAP modification called for an injection of hydrogen peroxide and nutrients into existing wells using direct push drilling technology injections which took place from February 29, 2016 through March 4, 2016. Post Application Remedial Monitoring (PARM) sampling has been conducted quarterly since then. As of quarter 6 in October 2017, the groundwater concentrations remained above cleanup target levels. MW-8 was particularly concerning because it is offsite and downgradient with some of the highest contaminant levels. Following this remediation attempt, AET partnered with REGENESIS to treat the ongoing contamination.