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REMEDIATION SERVICE Nn S AV E. SYSTEM RES EDIATION OF GASOLUgE CONTAMINATED SOIL AND GROUND WATER: IN SITU VACUUM E.XTKACMON SPRAY AERATION IN HEATED VACUUM TANK COMPRESSIVE THERM-AL OXIDATION CATALYTIC LNC19ERAT70N ABSTRACT The use of a heated vacuum chamber for spray aeration enhances the rate of evaporation of gasoline from contaminated ground water. The gasoline vapors are thermally oxidized by feeding them to an internal combustion engine where they are burned as part of the combustion process and exhausted through a catalytic converter. A vacuum increases the rate at which theasoline evaporates; S heat has the same effect. Two steps are required to remediate the gasoline contaminated water; the gasoline must be separated from the ground water and the resulting hydrocarbon vapors in the air stream must also be treated before release to the atmosphere. Thermal oxidation, exhausting through a catalytic converter, accomplishes both objectives It is possible to burn the vapors by feeding them to an internal combustion engine, where they are consumed as part of the combustion process of the engine. The exhaust emission levels of the engine remain unchanged as the air to fuel ratio retrains constant. 1 Thus, this process steps petroleum hydrocarbons from ground water, thereby simply and efficiently treating the water in the spray aeration unit RSI has developed a complete remediation system using spray aeration, vacuum extraction and compressive thermal oxidation in conjunction with a catalytic converter. The engine is the only power source, all peripheral components are powered by the engine. The cost of this system is considerably cess than the cost of conventional systems using air strippers with carbon absorption or catalytic thermal oxidation NMODUCTION Gasoline contamination in soil and ground water has become a major environmental concern over the last few years as more and more