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Case Closure Summary <br /> Leaking Underground f=uel Storage TankProgram i <br /> Parkinson's I-5 ARCO Service Station i <br /> 3250 West Hammer Lane, Stockton, California 95209 <br /> III. Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup i <br /> [Benzene <br /> ontaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> PH(Gas) 83,700 NA 25.7 <0.050 Xylenes 398 NA 1.6 <0.0005 <br /> PH(Diesel) NA NA NA NA MTBE 179 NA 47 0.0011 <br /> 8.47 NA 1.94 0.0037 1,2-DCA <0.1 NA 0.015 <0.0005 <br /> oluene 142 NA 0.503 <0.0005 EDB <0.1 NA <0.0005 <0.0005 <br /> th (benzene 64 NA 1.45 <0.0005 Lead 7.3 NA NA 0.0043 <br /> Comments: The`Soil Before' concentrations for TPH (gas)are from sample GP-1 @ 24 feet on 08/16/00, benzene, 1,2 <br /> E: <br /> and EDB from D-1@ 10'C @ 10 feet on 01/26/00, toluene, ethylbenzene and xylenes from Trench Stockpile 1 (TSP-1) <br /> l on 01/07/00, MTBE from D-4 @ 3 feet on 01/07/00, and lead from SB Deep @ 15 feet on 05/22/02. `Soil After' <br /> } concentrations were not collected. The`Groundwater Before' concentrations for TPH (gas), toluene and ethylbenzene are <br /> j from MWA on 09/21/00, benzene and MTBE from GP-2 on 08/16/00, xylenes from MWA on 04/23/01, and 1,2-DCA and <br /> ` EDB from MW-1 on 10/21/04. The`Groundwater After' concentrations for TPH (gas), benzene, toluene, ethylbenzene, <br /> xylenes are from MWA on 04/09/12, MTBE from MW-2 on 04/09/12, 1,2-DCA and EDB are from MWA on 01/16/06, and <br /> lead from MWA on 08/29/11. NA—not anal zed <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 /> u Does corrective action protect public health for current land use? Yes <br /> I Site management requirements: None <br /> Should corrective action be reviewed if land use changes? Yes <br /> i Monitoring/Vapor wells decommissioned: Yes Number Decommissioned: 7 monitoring and 8 inj.wells Number retained: 0 <br /> List enforcement actions taken: NOR on 01/19/00 <br /> i <br /> t List enforcement actions rescinded: None <br /> i <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: r Date: December 20, 2013 <br /> VI Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: May 9, 2013 Response Date: May 23, 2013 <br /> RB Staff: James L.L. Barton Response: Concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Pilot-scale ozone/hydrogen peroxide injection test was performed between June 9, 2011 and August 22, 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 />