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Ms Mary Meays Protect 0805-109 01 <br /> August 17, 1994 <br /> Page 3 <br /> Soil Vapor Extraction Based on the results of the site assessment and SVET, soil <br /> vapor extraction of gasoline hydrocarbons in vadose zone and capillary fringe soil appears <br /> feasible Implementation of this alternative will require installation of subgrade piping and <br /> installation and operation of a vapor extraction and abatement system This method will <br /> likely be less disruptive to business 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 (i e , groundwater pump and treat, and air spargtng) is not <br /> warranted at this time. However, based on both EMCON's experience and similar projects <br /> performed to San Joaquin County, soil vapor extraction will likely have a beneficial <br /> impact on groundwater by promoting biodegradation and volatilization at the groundwater <br /> surface. Data collected from groundwater sampling events conducted during operation of <br /> the soil vapqr, extraction and abatement system will provide information on the <br /> effectivenesse vapor extraction system has on groundwater cleanup <br /> r <br /> Please call if you have questions regarding this addendum or any aspect of the project <br /> Sincerely, <br /> EMCON Associates <br /> J"ae <br /> Claudio Avila a R nson <br /> Project Geologist R G 67 <br /> Attachments Table 1 Summary of Well Data <br /> Figure 1 Site Vicinity Map <br /> Figure 2 Generalized Site PIan <br /> Figure 3 Geologic Cross Section A-A' <br /> Figure 4 Geologic Cross Section B-B' <br /> Appendix A Copy of Vapor Extraction Test Report <br /> cc. Kyle Christie, ARCO Environmental Engineer <br /> Chuck Carmel, ARCO Environmental Engineer <br /> Elizabeth Thayer, Regional Water Quality Control Board, Northern Region <br /> SACIRI"805\08051090 tbm-94 maze 4 <br />