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Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Thrifty Oil Company #171, 1250 N. Wilson Way, Stockton. <br /> 1I1 Release and Site Characterization Information (continued) February 22,2011 <br /> FT7- <br /> XIMum Documented Contaminant Concentrations - Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 5300 110. 61.7 Ethylbenzene 91. 0.640 0.135 <br /> TPH (Diesel) NA NA NA NA Xylene 440. 16. 1.03 <br /> Benzene 3.0 11. 0.023 MTBE NA +NA 0.092 <br /> Toluene 14. 17. 0.916 1,2-DCA NA +NA I<.001 <br /> Comments: NA= not analyzed. Soil data "before" from TB-7 borehole sampling, June 1995. * Soil <br /> "after": No soil data available since no confirmation soil samples collected near same areas. Water <br /> "before" from TB-7, June 1995. Water "after" from TB-7, June 2010. +First MtBE groundwater analyses <br /> conducted in monitoring well TB-7 on August 28, 1996 where MtBE reported at 1,500 ug/1 by EPA 8020. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per Regional Board Basin Plan? Yes <br /> Does completed corrective action protect potential beneficial uses per Regional Board Basin Plan? Yes <br /> Does corrective action protect public health for current land use? Yes <br /> Site management requirements: none <br /> Should corrective action be reviewed if land use changes? Yes <br /> Have the MonitoringNapor wells been decommissioned? Yes. Number Decommissioned: 25 <br /> Number retained: 0 <br /> List enforcement actions taken: NOR, September 8, 1989 <br /> List enforcement actions rescinded: nla <br /> V. Local_Agency Representative Data <br /> Name: Donna Heran, RENS Title: Director, Environmental Health Department <br /> Signature: � � ___._ . Date: 2- _ S-2 012- <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: November 17, 2011 Response Date: December 2, 2011 <br /> RB Staff: James L.L. Barton, Title: Engineering Geologist Response: Concurrence to NFA. <br /> VII. Additional Comments, Data, etc. <br /> Fmediation: 1) Impacted soil removed in 1994 UST removal but returned to UST pit immediately. <br /> SVE from 1999 to 2010 ion & off]. 3) GWE 2009 only. All wells properly removed, January 18, 2012 1 <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part <br /> of the official site file. <br /> Page 2 of 2 <br /> MY <br />