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i <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Former S#efano'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 /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPN (Gas) 4,400 NA 210 70 Xylenes 1,000 NA 37 9.6 <br /> TPH (Diesel) NA NA NA NA MTBE <0.005 NA 0.12 X0.001 <br /> Benzene 4.5 NA 19 0.27 1,2-DCA 1.<0.005 NA 0.5 0.0057 <br /> 11 Toluene 170 NA 64 1.8 EDB 0.22 NA 0.019 X0.0005 <br /> Eth (benzene 197 NA 6.3 12.7 Lead 138 1 NA NA I NA <br /> Comments: The 'Soil Before' concentrations for TPH (gas), 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 131 @ 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 from MW-2 on 11101101, <br /> benzene and MTBE from MW-2 on 12123103, toluene from MW-2 on 01111199, ethylbenzene from MW-2 on 10115107, <br /> xylenes from MW-2 on 07101108, and EDB from MW-2 on 02107105. The `Groundwater After' concentrations for TPH <br /> (gas), benzene, toluene, ethylbenzene, xylenes and 1,2-DCA are from MW-2 on 8125111, and MTBE and EDB are from <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 /> MonitoringNapor wells decommissioned: No Number Decommissioned: 0 Number retained: 9 MWs, 5 soil vapor <br /> extraction wells, and 4 ozonesparge wells <br /> List enforcement actions taken: NOR on 08/12/94 and 07/30/96 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, RENS Title: Acting Program Coordinator <br /> Signature: y7 J Date: <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: Associate Engineering Geologist <br /> VII. 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 i <br /> k <br />