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jpflJ�l-'. <br /> Interim Corrective Action Plan—Tosco(76)Service Station No. 11195,Lathrop, California <br /> August 28,2002 <br /> OPTION#5—OZONE MICROSPARGING <br /> Ozone microsparging is a process where ozone in air is introduced into the groundwater through <br /> specially designed spargers to create small"microbubbles."As these microbubbles rise within <br /> the column of water, the dissolved VOCs are rapidly oxidized. Low total flow rates(2-6 cfm) <br /> are used. Any ozone not consumed in the direct reaction with hydrocarbons rapidly decomposes <br /> to oxygen. This has an added benefit of stimulating the natural biological degradation. <br /> COST: $60,000 to $100,000 <br /> TIME FRAME: Short term for impacts on and near the site, Ionger for offsite impacts. <br /> ADVANTAGES: 1) Relatively low equipment and operating costs. <br /> 2) Because of low flow rates, vapor extraction to capture off gassing is <br /> not required. <br /> 3) Natural biodegradation rates may be enhanced by introduction of <br /> oxygen. <br /> 4) GR tests at other sites indicates the ability of an ozone air mixture to <br /> degrade MtBE, which is the main constituent of concern. <br /> F> DISADVANTAGES: 1) Areas outside of the injection point radius of influence may take <br /> longer to treat. <br /> 2) Might be difficult to treat large areas without access to private <br /> property. <br /> CONCLUSION: Initial results of GR field tests at other service station sites indicate that this is <br /> a feasible remedial technique for treating MtBE and other petroleum <br /> compounds at this site. <br /> FEASIBILITY STUDY(Continued) <br /> 1. For all sites,each recommended alternative shall be designed to mitigate nuisance <br /> conditions and risk of fire or explosion: <br /> A site Health and Safety Plan (HSP) will be prepared for the recommended scope of <br /> work. The HSP will be strictly followed in order to ensure site and community safety. <br /> 2. For sites where unauthorized release affects or threatens water with current or <br /> potential beneficial uses designated in water quality control plans, the feasibility <br /> study shall also identify and evaluate at least two alternatives for restoring or <br /> protecting these beneficial uses: <br /> 140193.13 10 <br />