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411( <br /> Geological Audit Services, Inc. <br /> X05 22911 5avi Ranch Parkway Yorba Linda, CA 92687 (714) 283-0130• FAX (714) 283-0258 <br /> ' PROPOSED CLEANUP METHOD AT GENOVA BAKERY <br /> 749 N. SIERRA NEVADA, STOCKTON <br /> tEXECUTIVE SUMMARY <br /> ' The quality of the water we drink and of the air we breathe is <br /> critical to us all. Without any doubt, our resources need to be <br /> protected and existing contaminated sites have to be cleaned up. <br /> ' However, we need to employ effective cleanup methods that 1) do not <br /> merely transfer the contaminants from one place to another, 2) keep <br /> costs to the responsible parties affordable and 3) are <br /> ' environmentally safe. <br /> Upon removal of an underground gasoline tank at Genova Bakery, soil <br /> ' contamination was discovered. Geological Audit Services, Inc. is <br /> retained to mitigate the problem. After careful consideration, we <br /> believe that an in-place vapor extraction program is the most <br /> effective method of cleanup for this site, both in cost and in <br /> ' operation. <br /> The process we propose is quite straightforward. Piping is inserted <br /> into the impacted soil and an engine driven blower draws fresh air <br /> through the gasoline contaminated soil into manifolded recovery <br /> wells. Gasoline--laden vapor from the extraction manifold is drawn <br /> through a filter into to the carburetion system of an internal <br /> combustion engine. The engine burns the gasoline vapor the same way <br /> an automobile engine does. Regulated by a fuel control computer, <br /> natural gas is added as necessary to maintain the proper air/fuel <br /> ratio for maximum combustion. The exhaust from the combustion <br /> process is passed through a three-way catalytic converter for <br /> further oxidation. <br />' A constant destruction rate of greater than 90% of the gasoline is <br /> maintained throughout the entire cleanup duration. This destruction <br /> rate is better than that of an average and well--tuned car engine, <br />' representing a negligible health risk factor, if any. <br /> The treatment unit is planned to be installed in a well-insulated <br />' operation area with the exhaust stack extended to 20 feet high. <br /> Although the plan calls for a 24-hour operation, the noise level <br /> should not be obtrusive and will not pose a nuisance. This cleanup <br />' project is calculated to be completed within 6 to 18 months. <br /> Environmental Services • Hydrogeology•Geotechnical Services <br />