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i <br /> 2. Soil Vapor Extraction <br /> Based on the results of the site assessment and SVET, soil vapor extraction of gasoline <br /> hydrocarbons in vadose zone and capillary fringe soil appears feasible Implementation of this <br /> alternative will require installation of subgrade piping and installation and operation of a vapor <br /> extraction and abatement system This method will likely be less disruptive to business <br /> operations and is more cost effective than excavation <br /> Groundwater Remediation <br /> Based on analytical data collected from groundwater to date, EMCON believes active <br /> groundwater remediation is not warranted at this time However, based on both EMCON's <br /> experience and similar projects performed in San Joaquin County, soil vapor extraction will likely <br /> have a beneficial impact on groundwater by promoting biodegradation and volatilization at the <br /> groundwater surface Data collected from groundwater sampling events conducted during <br /> operation of the soil vapor extraction and abatement system will provide information on the <br /> effectiveness the vapor extraction system has on groundwater cleanup <br /> Please call if you have questions regarding this addendum or any aspect of the protect <br /> Sincerely, <br /> EMCON Associates <br /> Claudio Avila J R hnson <br /> Project Geologist R G 867 <br /> Attachments Figure 1, Site Vicinity Map <br /> Figure 2, Generalized Site Plan <br /> Figure 3, Geologic cross section A-A' <br /> Figure 4, Geologic cross section B-B' <br /> Table 1, Summary of Well Data <br /> Appendix A Copy of Vapor Extraction Test Report <br /> I <br />