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, a <br /> Thrifty Oil Co. Station #172 <br /> Page3 <br /> Groundwater Treatment System <br /> The groundwater treatment system was started in conjunction with the vapor treatment system on <br /> April 26, 2001, and the flow meter started at zero Presently, the remediation system is connected <br /> to groundwater wells MW-10 and MW-11 Two down-well pneumatic pumps (one in each well), <br /> draw water into a 150 gallon polyvinyl tank which then transfers the water through two (2) one <br /> thousand pound canisters with activated carbon <br /> During this reporting period, the groundwater extraction system treated and discharged <br /> approximately 18,315 gallons as of December 27, 2001, for a total of 77,071 gallons The <br /> groundwater remediation system influent, intermediate, and effluent streams were sampled on <br /> October 18,November 14, and December 19, 2001 for TPH-g by EPA method 8015, BTEX/MTBE <br /> by EPA method 8021B EPA method 8260B was used to confirm MTBE concentrations for the <br /> samples collected on November 14 and December 19, 2001 Groundwater samples were collected <br /> from the inlet ports of the system from wells MW-10 and MW-11 on November 28, 2001 Field <br /> status reports are presented in Appendix C, and laboratory analytical results for the groundwater <br /> samples are included in Appendix E Historical groundwater system operations are reported in <br /> Table 4 <br /> • Summary and Recommendations <br /> The soil vapor extraction was started on April 12, 2001, and groundwater extraction was started on <br /> April 26, 2001 A total of 28,340 pounds of hydrocarbons have been destroyed by the vapor <br /> extraction system, and 77,071 gallons of groundwater has been treated by the groundwater system <br /> Thrifty will continue quarterly groundwater monitoring, gauging, purging and sampling of all <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 EMC, <br /> and analysis by Associate Laboratories <br /> Written by Reviewed by <br /> r <br /> 0 , <br /> R <br /> L/L <br /> and C Friedrichsen, REA II Ross A Williams <br /> Project Manager, MBA Registered Geologist#63 �cF=p,�� cFCZ <br /> 0 <br /> Senior Environmental Hydrogeologist v <br /> • � ROSS A � <br /> * WILLIAMS <br /> N No 5327 `Q <br /> 9�CF <br />