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Geological Audit Services, Inc. 22911 Savi Ranch Parkway•Yorba Linda, CA 92fi87 • (714) 283-0130 FAX (714) 283-0258 ^wv= I. INTRODUCTION Geological Audit Services, Inc. (GeoAudit) is retained by Estate of ' Angelo Rollerx to mitigate gasoline contaminated soil at Genova Bakery, 749 N. Sierra Nevada, Stockton, California. ' Z. I. PHILOSOPHY AND BACKGROUND OF THE CHOSEN TREATMENT METHOD Without a doubt, our most valuable resources are those that sustain life. The quality of the water we drank and of the air we breathe is critical to us all. We need to employ effective methods to Mitigate contaminated sites without transferring the contaminants ' from one medium to another, while keeping costs to the responsible parties affordable. Several mitigation methods for this site were considered; ranging from soil removal followed by aeration/treatment to in-situ treatments. The impact of an excavation method on the operation and on the integrity of the bakery could be severe. Accordingly, we believe that an in-situ treatment is the most effective method of mitigation. ' Due to the strict air pollution regulations in Southern California, which were passed by the South Coast Air Quality Management District (SCAQMD) in 1987, GeoAudit has successfully designed and completed several soil treatment projects using vacuum extraction, both on the surface and in-situ. Our vacuum extraction unit uses an internal combustion engine to destruct hydrocarbon contaminants. The engine power is used to drive the vacuum blower. Given ' sufficient vapor saturation and composition, the engine operation can be sustained by the recovered vapor. To maximize the destruction ratio, a provision to co-fire the engine with natural ' gas is provided. By destructing the contaminants rather than transferring them into another medium, there is no need to deal with spent filters, e.g. activated carbon, at the end of the mitigation period. Based upon the mostly sandy soil type and the volatile nature of the hydrocarbon contaminants, an in-situ vacuum extraction appears ' to be the preferred method of mitigation. Although we do not anticipate to encounter a free-floating product layer at this site, the proposed vacuum extraction system has proven itself to remediate a minor layer of volatile free-floating product as well. A destruction rate of greater than 90% of hydrocarbon is expected throughout the entire cleanup duration. This destruction rate of hydrocarbons is better than that of an average and well-tuned car engine, representing a negligible health risk factor. Environmental Services •Hydrogeology •Geotechnrcal Services