In Situ Bioremediation at South Beach Marina Hilton Head South Carolina

A full-scale cleanup was performed using in situ bioremediation to treat MTBE, BTEX, and naphthalene in groundwater at a service station with leaking underground fuel storage tanks. At this site, groundwater is 1.32-2.11 m (4.32-6.92 ft) below the ground surface, with an average hydraulic gradient of 0.078 m /m (0.078 ft /ft) and with a calculated velocity of 1.96m/yr (6.42 ft /yr). No confining units were identified at the site.

The in situ bioremediation application at this site included injection of a liquid microbial solution into the subsurface through monitoring and injection wells. This solution includes microbes (Pseudomonas, Bacillus, and Corynebacterium), oxygen, emulsifier, surfactant, and nutrients. Five injections were conducted. Over 11.3 m3 (3000 gallons) was injected from February 1999 to September 2000 into approximately 40 wells and 15 Geoprobe injection points. As of September 2000, MTBE levels decreased by 96% (3310-146 ^g/ L), while benzene decreased by 83% (2571435 |^g/ L), toluene by 66% (24,330-8300 ^g/ L), and naphthalene by 84% (5377-853 ^g/ L); xylene levels increased and were above preoperational level as of September 2000. The system will continue to be operated until all target levels have been met. The total cost for the cleanup of this site is USD63,500.34

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