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The Bryant Grocery and Saw Co. site in the Florida Panhandle was the subject of excavation activities to remediate significant BTEX and TPH contamination as a result of historical releases from gasoline underground storage tanks (USTs). Excavation activities were planned for an area of approximately 1,600-square-feet to a depth of 14 feet below ground surface.
During backfill activities, ORC Advanced Pellets were added to provide a long-term source of oxygen to promote aerobic biodegradation of residual, dissolved-phase petroleum constituents remaining in the excavation area. A total of 520 pounds of ORC Advanced Pellets were applied to the saturated zone of the excavation. Both MW-7R and MW-14R have seen BTEX, TRPH, and MTBE reduced to stringent groundwater quality standards for Florida (Groundwater Contaminant Target Levels, or GCTLs). In MW-5R, Total Residual Petroleum Hydrocarbons (TRPH), MTBE, benzene, and ethylbenzene have been reduced to below GCTLs. Toluene and xylenes concentrations remain slightly above GCTLs but have declined by more than 99% related to both constituents.
Advanced Formula Oxygen Release Compound (ORC Advanced®) is a proprietary formulation of food-grade, calcium oxy-hydroxide that produces a controlled-release of molecular oxygen for periods of up to 12 months upon hydration.