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Thrifty Oil Co. Station #172 Page3 draw water into a 150 gallon polyvinyl tank which then transfers the water through two (2) one thousand pound canisters with activated carbon During this reporting period, the groundwater extraction system treated and discharged approximately 14,182 gallons as of June 27, 2002 for a total of 93,114 gallons The groundwater I remediation system influent, intermediate,and effluent streams were sampled on April 18, 2002 for TPH-g by EPA method 8015, BTEX/MTBE by EPA method 8021B Also collected from the outlet stream was also sampled for trace metals and pH by EPA method 6010B and EPA method 24 1, respectively Field status reports are presented in Appendix C, and laboratory analytical results for the groundwater samples are included in Appendix E Historical groundwater system operations are reported in Table 4 The groundwater extraction system was non-operation from April 29 through May 3, 2002 because Ithe technician was on vacation Summary and Recommendations IThe soil vapor extraction was started on April 26, 2001, and groundwater extraction was started on April 26, 2001 A total of 30,401 pounds of hydrocarbons have been destroyed by the vapor . extraction system, and 93,114 gallons of groundwater have been treated by the groundwater system I The groundwater extraction system operated through the quarter except from April 29 through May 3, 2002 because the technician was on vacation rThrifty will continue quarterly groundwater monitoring, gauging, purging and sampling of all groundwater monitoring wells, and operation of the remediation system All interpretations expressed in this report are based solely upon review of data collected by EMC and analysis by Associate Laboratories Written by Reviewed by Efl GE IWJAMES It G Na 6701 2 6a;yLndC Friedrichsen, REA II im Zenor PrManager, MBA Registered Geologist 9 CALw Senior Environmental Hydrogeologist I