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i rti <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Thrifty Oil Company#171, 1250 N. Wilson Way, Stockton. <br /> 111 Release and Site Characterization Information continued November, 2011 <br /> Maximum Documented Contaminant Concentrations - Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) Afte <br /> Before After Before After Before After Before <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 ug/l by 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 Monitoring/Vapor wells been decommissioned? Not all. Number Decommissioned: 3 <br /> Number retained: 22 casings in 20 boreholes. TB-9, TB-11, & TB-12 = triple casings- in a single hole <br /> List enforcement actions taken: NOR, September 8, 1989 <br /> List enforcement actions rescinded: nla <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Acting LOP Program Coordinator <br /> Signature, ,� � �� Date: 11111-7111 <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: ]-Response Date: <br /> RB Staff: James L.L. Barton Response: <br /> Title: Engineering Geologist <br /> V11. Additional Comments, Data, etc. <br /> Remediation: 1) Impacted soil removed in 1994 UST removal but returned to UST pit immediately. 2) <br /> SVE from 1999 to 2010 [on & oft]. 3) GWE, 2009 only. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of <br /> the official site file. <br /> Mir <br />