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 FAQs

IN-SITU VACUUM EXTRACTION PROJECTS:
6. SOIL AND GROUNDWATER REMEDIATION GASOLINE STATION AND CONVENIENCE STORE

Munro Petroleum & Terminal Corporation Biloxi, Mississippi

A gasoline leak from aging USTs had impacted soil and groundwater at he Central Beach gasoline station and convenience store site in Biloxi, Mississippi. Although the Mississippi Department of Environmental Quality had allocated funds for one year of TPVE operations, the remediation of the site was completed in just four months.

An environmental assessment at this very active convenience store determined the concentration and location of contaminants in both the soil and groundwater . While most of contamination was limited to the immediate vicinity of the dispenser islands, some gasoline had migrated underneath the adjacent state highway. Since heavy highway traffic prohibited soil cleanup by excavation, the use of TPVE was recommended to cleanup both soil and groundwater.

The TPVE system was installed and started up in early August, 1993. The system extracted in excess of 7,000 gallons of groundwater per day. Mathematical modeling techniques showed that the zone of influence of the TPVE extended across the adjacent state highway. Approximately 2,500 pounds of hydrocarbons were removed from the site in four months.

The cleanup progressed much faster than anticipated. The rate of extraction of hydrocarbons dropped off significantly by early December of 1993 and the analysis of groundwater samples collected then showed that the state mandated ground water cleanup objectives had been surpassed by a factor of more than ten. MDEQ therefore required no further remediation. The project, initially budgeted at about $138,000 was completed for a total cost of less than $71,000 with no interruption of station operations.