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• RECEIVED <br /> Case Closure Summary FEB 2 6 2014 <br /> Leaking Underground Fuel Storage Tank PrograrENVIRONMENTAL <br /> Thrifty Oil Company #171, 1250 N. Wilson Way, Stockton. HEALTH DEPARTMENT <br /> III Release and Site Characterization Information continued Februa 22,2011 <br /> Maximum Documented Contaminant Concentrations - Before and After Cleanup <br /> { <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 <.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 u /I by EPA 8020. <br /> IV. Closure <br /> ff <br /> ompleted corrective action protect existing beneficial uses per Regional Board Basin Plan? Yes <br /> mpleted corrective action protect potential beneficial uses per Regional Board Basin Plan? Yes <br /> rrective action protect public health for current land use? Yes <br /> nagement requirements: none <br /> corrective action be reviewed if land use changes? Yes <br /> e MonitoringNapor wells been decommissioned? Yes. Number Decommissioned: 25 <br /> retained: 0 <br /> rcement actions taken: NOR, September 8, 1989rcement actions rescinded: n/a <br /> V. Local Agency Representative Data <br /> [Name:, Donna Heran, RENS Title: Director, Environmental Health Department <br /> gnature: Date: �_ S_Z 012- <br /> VI. Central Valley Regional Water Quality-Control Board RB Notification <br /> Date Submitted to RB: Novemger 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 /> Remediation: 1) Impacted soil removed in 1994 UST removal but returned to UST pit immediately. <br /> 2) SVE from 1999 to 2010 on & o . 3 GWE, 2009 only. All wells properly removed, January 18, 2012 <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 /> Mi/ <br />