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1 <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Thrifty Oil Company #171, 1250 N. Wilson Way, Stockton. <br /> III Release and Site Characterization Information continued February22,2011 <br /> Maximum 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. 0.64011.03 <br /> TPH (Diesel) NA NA NA NA Xylene 440. 16.Benzene 3.0 11. 0.023 MTBE NA +NAToluene 14. 17. 0.916 1,2-DCA NA +NA <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 /> 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 Pian? 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 Monitoring/Vapor 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 List enforcement actions rescinded: n/a <br /> V. Local Agency Representative Data <br /> r <br /> me. Donna Heran, REHS Title: Director, Environmental Health Department <br /> nature: �. Date: 2-- 5- /2- <br /> VI. <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 /> Remediation: 1) Impacted soil removed in 1994 UST removal but returned to UST pit immediately. <br /> 2 SVE from 1999 to 2010 [on & off]. 3) GWE, 2009 only. All wells property 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 /> Mil <br /> t <br />