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. ReVIEDIATTON SERVICE INT'L S A V E SYSTFM REMEDIATION OF GASOLINE CONTAMINATED SOIL AND GROUND WATER IN SITU VACUUM EXTRACTION SPRAY AERATION IN HEATED VACUUM TANK COMPRESSIVE THERMAL OXIDATION CATALYTIC INCINERATION 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 the gasoline evaporates; 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 j 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 remains constant. 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 less than the cost of conventional systems using air strippers with carbon absorption or catalytic thermal oxidation. INTRODUCTION • Gasoline contamination in soil and ground water has become a mayor environmental concern over the last few years as more and more 1