Ralph Realty UST Remediation
CommTank was retained by the property owner to install a new gasoline UST and retrofit several existing USTs as part of a station rebuild/renovation project at 733 South Main Street. During excavation operations to install a new canopy that is adjacent to the area of new and retrofitted USTs on November 9, 2016, CommTank discovered an abandoned 1,000-gallon capacity single-walled steel gasoline UST. CommTank notified the local Fire Prevention Department to obtain a removal permit and the UST was removed from the ground. Using a portable photoionization detector (PID) CommTank personnel measured readings of total organic vapors (TOVs), calibrated to benzene between 0 and 1,200 parts per million by volume (ppmv). The reading of 1,200 ppmv was measured at pit bottom (designated as PB), a depth of 7 feet below grade beneath the UST.
On November 10, 2016, Mr. Kevin J. Kavanaugh, LSP, CHMM for ECMS called the MassDEP – Southeast Regional Office (SERO), Bureau of Waste Site Cleanup on behalf of the property owner, Ralph Realty Trust LLC, to report an MCP 72-hour release notification requirement for a release of petroleum from a 1,000-gallon capacity petroleum UST [soil headspace or TOVs reading greater than 100 ppmv utilizing a PID during a UST removal/closure]. The MassDEP issued RTN 4-26419 and orally approved an IRA to include the excavation, stockpiling and offsite disposal of up to 250 cubic yards of petroleum-impacted soil and to remove up top 2,500-gallons of impacted groundwater within the excavation into an on-site storage tank for proper offsite disposal, if necessary.
Darkened soil at the bottom of the underground storage tank excavation is evidence of a leak
ECMS recommended that soil excavation be conducted in the area of the two (2) 1,000-gallon abandoned and removed USTs. Excavation of soils was extensive but based on post excavation soil sampling, it appears that the UST excavation can meet the requirements of a Method 1 Risk Characterization with the average exposure point concentration (EPC) below its respective Method 1 Soil Standard under the MCP.