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ll <br /> Fourth Quarter 2004 <br /> Thrifty 4172 <br /> January 19, 2004 <br /> Page 4 <br /> Summary and Recommendations <br /> The soil vapor and groundwater extraction systems were started on April 26, 2001 A total of <br /> 92,537 pounds of hydrocarbons have been destroyed by the vapor extraction system, and 329,944 <br /> gallons of groundwater have been treated by the groundwater system The VEU system was <br /> down during the current quarter due to mechanical problems with a blower Due to declining <br /> dissolved hydrocarbon concentrations in other onsite wells, Thrifty focused groundwater cleanup <br /> efforts only on well MW-11 during the reporting period <br /> Closing Comments <br /> Thrifty will continue quarterly groundwater monitoring, gauging, purging, and sampling of the <br /> groundwater monitoring wells, and operation of the remediation system <br /> All interpretations expressed in this report are based solely upon review of data collected by <br /> • EMC and laboratory analyses by Associated Laboratories <br /> Respectfully submitted, - <br /> a <br /> Michael H Bowery, G 5027 Chris Panaitescu <br /> Project Manager'CAGeneral Manager <br /> Environmental Affairs <br /> cc - Ms Michelle Wilson <br /> Circle K Stores, Inc <br /> 495 East Rincon, Ste 150 <br /> Corona, CA 92879 <br /> - Ms Liz Sewell <br /> Tosco Marketing Company <br /> 76 Broadway <br /> Sacramento, CA 95818 <br /> - File <br /> • <br />