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Soil Va or Extraction Test Results <br /> ARCO Facility 2186 <br /> Stockton, California <br /> Page 5 <br /> TPHG concentration in extracted soil vapors and the average air flow rates identified <br /> during the SVE tests <br /> CONCLUSIONS <br /> Based on the SVE tests we conclude the following <br /> • Influent soil vapor concentration and mass extraction rates are low (1-4 <br /> pounds per day) <br /> • Although high vacuums (50-100 "WC) were applied to extraction wells, <br /> resultant flow rates (approximately 10 cfm) observed during the tests were <br /> low <br /> • ROI estimates based on induced vacuum observations in monitoring wells <br /> vaned only from 30 to 40 feet <br /> Petroleum hydrocarbons were detected in the soil vapors extracted from shallow vapor <br /> extraction wells during the tests SVE is a viable remedial alternative and can potentially <br /> be used to mitigate petroleum hydrocarbon impact in the shallow subsurface Initial <br /> removal rates (and influent soil vapor concentrations) typically decrease rapidly with <br /> time, depending on site-specific conditions <br /> The low flow and mass extraction rates indicate that other remedial alternatives can also <br /> be used to mitigate the petroleum hydrocarbon impact in the shallow subsurface <br /> If you have any questions or concerns, please contact Jay Johnson at (530) 676-6000 <br /> Sincerely, <br /> ;DE,LYANVI ONMENTAL CONSULTANTS, INCowwt a J o gager <br /> Project Engineer ro ect <br /> cc Paul Supple, Atlanta Richfield Company <br /> Lisa Middleton, SJVUAPCD <br /> Attachments Table 1 Summary of SVE Wells Used During the Tests <br /> Table 2 SVE Test Monitoring Data <br /> Table 3 SVE Test Monitoring Data for Well VW-2S <br /> Table 4 SVE Test Monitoring Data for Well VW-3S <br />