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In- itu Bioremediat on In-situ bioremediation is a method which utilizes bacteria to metabolize organic contaminants (usually fuel hydrocarbons) in soil and/or groundwater. The aerobic processes which would be employed produce the non-toxic end products of carbon dioxide, minerals, and water. Upon receiving a permit from appropriate regulatory agencies, water containing high levels of dissolved oxygen, nutrients, and populations of non-pathogenic, hydrocarbon utilizing bacteria would be introduced into the area of contamination through injection wells. This would create conditions which would permit the bacteria to detoxify the soils through mineralization (thorough aerobic biodegradation) which would transform the hydrocarbons comprising gasoline into non-toxic end products. The rate at which the "conditioned" water is introduced would be carefully regulated and monitored so as to preclude introducing contaminants into groundwater not yet impacted. Should groundwater itself require treatment, the biological treatment unit may be used to anchor a groundwater injection- extraction and surface treatment system. A portion of the water thus treated would be discharged to sewer and the balance would serve as the "conditioned" water to treat soils in-situ. Groundwater would be pumped from extraction wells to an above ground storage tank. The plumbing would be placed underground to accommodate traffic in the area. The treatment system, that ' is the holding tanks, reactor, and primary plumbing will be contained within a fenced area that is bermed and lined with a hydrocarbon resistant material to prevent the uncontrolled release of hydrocarbon contaminated fluids in the unli)Rely event S of a system failure. - 'S Costs for biological detoxification of in-situ soils are also estimated at approximately $50, 000.00. Remedial Excavation A variety of excavator types are capable of reaching the depths appropriate to this project. . .likely without the need for shoring. Contaminant plumes encountered in the subsurface would be tracked using field instrumentation and removed. At such time as all significantly contaminated soils had been excavated and/or excavation could no longer continue due to the presence of underground utilities, a building, roadway, or other significant impediment, boundary samples would be acquired for certified analysis and the excavation backfilled, compacted, and repaved. Contaminated soils would then be removed for II.