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f���i:ar�•'a ��ai ra*� <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Former Stefano's Gas Station <br /> 1419 East Charter Way, Stockton <br /> Ill. Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> m Contaminant' Soil (ppm) Water (ppm) <br /> Contaminant Soil (ppm) Water (ppm) Before After Before After <br /> Before After Before After 1 000 NA 37 9.6 <br /> TPN (Gas) 4,400 NA 210 70 Xylenes <br /> NA NA NA MTBE X0.005 .� NA 0.12 - X0.001 <br /> TPW(Diesel) NA 1,2 DCA _ <0.005.. NA 0.5 0.0457 <br /> Benzene 4.5 NA 19 0-27, <0.0005 <br /> Toluene 170 NA 64 1.8 EDB <br /> 0:22� NA 0.019 <br /> Ethylbenzene 97 NA 6.3 2.7. <br /> Lead. 38 NA NA NA <br /> as <br /> Comments: ,The Soil Before concentrations for TPN (g ), toluene, xylenes and EDB are from sample T2-C-12' @ 12 <br /> feet on 10127192, benzene from MW2-50 @ 50 feet on 01105199, ethylbenzene from B1@ 30 feet on 08117194, MTBE and <br /> 1,2-DCA from CPT1-65 @ 65 feet on 04125100, and lead from T1-S-12' @ 12 feet on 10127192. `Soil After' concentrations <br /> were not collected. The 'Groundwater Before' concentrations for TPH (gas) and 1,2-DCA are fom'MW-2 an 11101101, <br /> 2 on 01111199, ethylbenzene from MW-2 on 10115107, <br /> benzene and MTBE from MW-2 on 12123103, toluene from MW- <br /> xylenes from MW-2 on 07101/benzenEDB lenes and 1,2-DCA are from MW 2 on 8125111, an 02/07/05. The 'Groundwater ntdrMTBE and EDB acr TPH <br /> re from <br /> (gas), benzene, toluene, ethylbenze y _ _ <br /> MW-2 on 09118109. NA—not analyzed <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> -Does completed corrective action protect potential beneficial uses per the 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 /> Monitoring/Vapor wells decommissioned: Yes Number Decommissioned: 18 Number retained: 0 <br /> List enforcement actions taken: NOR on 08/12/94 and 07/30/96 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Re resentative Data <br /> Name: Donna eran, irector <br /> Signature: Date: April 24, 2013 <br /> -VI Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: October 8, 2012 Response Date: October 24, 2012 <br /> t RB Staff: James L.L. Barton Response: Concurrence <br /> Title: Engineering Geologist <br /> V11. Additional Comments, Data, etc. <br /> Interim SVE remediation was conducted between November 2004 and June 2005. Ozone injection was intermittently <br /> performed between December 2004 and September 2011. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br /> Page 2 <br />