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Quik Stop No 121 Closure Report CCI Project No 12118 Page 11 temperature to climb to approximately 900 degrees F The treated soil vapors would be discharged to the atmosphere through a 10-foot high stack As previously mentioned, Quik Stop had been conducting monthly dual phase vapor extractions at the subject site using a Mobil Treatment System (MTS) Due to the granular nature of the subsurface soil at the site, dual phase vapor extraction had a positive impact on the groundwater compounds at the site By the end of the 91h MTS event, the amount of equivalent product being removed had dropped significantly due to the positive impact the MTS events were having on the site Based on the costs associated with installing a permanent system and the reduction in contamination that had already been achieved by the MTS events, it was CCI's opinion that it was not economically prudent to pursue the installation of a permanent Dual- Phase System (System) at the site Review of Ozone Injection Technology The third option involves treatment of the groundwater contamination in-situ using an ozone injection technology Ozone is a highly reactive chemical that is very effective in destroying a wide variety of organic compounds, including MTBE In general,this technique uses several sparge points (wells), which are constructed of porous plastic, and are connected to an ozone generator Ozone is introduced into the aquifer in the form of micro-fine air bubbles under low pressure in order to degrade the volatile compounds This remediation technique appeared to be appropriate for the subject site since no groundwater needs to be extracted for above-ground treatment, and the subsurface soils are favorable and the groundwater gradient is virtually flat The system is connected to several Spargepomts@(Spargepoint) placed at selected locations throughout the site Each Spargepoint measures 2 inches in diameter and 18 inches in length, and is connected to the surface by a 314-inch diameter, schedule 40, threaded, PVC riser pipe A well head assembly is then attached to the top of the riser pipe, and a surface vault box covers each Spargepoint The Spargepoints are then connected by double-contained tubing, which are placed in shallow trenches The tubing leads back to the master control unit, which runs on a current of 110 V and has an ozone generator, which is designed to generate very small (approximately 50 micrometers in diameter) bubbles of ozone The master control unit injects 3 to 5 cubic feet per minute (CFM) of ozone for 8 to 12 minutes at each individual Spargepoint at controlled rotating intervals The ozone micro bubbles are forced into the surrounding water- bearing formation under very low pressure The micro-fine bubbles produced at the master control panel are released to the groundwater at each Spargepoint The encapsulated ozone reacts with dissolved contaminants, producing harmless by-products