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Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> 7-Eleven Store No. 17334 <br /> 4501 North Pershing Avenue, Stockton, California <br /> III. 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 /> TPH (Gas) 4,300 NA 1,120 1.0 Xylenes 730 NA 26.9 0.044 <br /> TPH(Diesel) <1 NA <0.050 NA MTBE 8.1 NA 100 0.0086 <br /> Benzene 0.39 NA 10.4 0.022 1,2-DCA <0.0050 NA <0.005 NA <br /> Toluene 120 NA 33.4 0.037 EDB <0.0050 NA <0.005 NA <br /> Ethylbenzene 120 NA 4.58 0.023 Lead 66 NA NA NA <br /> Naphthalene <0.005 NA 0.045 NA <br /> Comments: The `Soil Before' concentrations for TPH (gas), toluene, ethylbenzene and xylenes are from sample TNK-3S <br /> @ 14 feet on 9/14/1998, TPH-(diesel)from MW-2 @ 20 feet on 9/24/1997, benzene from MW-1A @ 25 feet on 09/24/1997, <br /> MTBE from MW-1A @ 21 feet on 9/24/1997, 1,2-DCA, EDB and naphthalene from SPV-1 @ 30 feet on 04/04/2002, and <br /> lead from SP-41D on 09/14/1998. `Soil After' concentrations were not collected. The `Groundwater Before' concentrations <br /> for TPH (gas) are from MW-5A on 11/24/1999, TPH-(diesel)from MW-2 on 12/19/1997, benzene, toluene, ethylbenzene <br /> and total xylenes from MW-5A on 12/29/1998, MTBE from GP4 on 2/20/1997, and 1,2-DCA, EDB and naphthalene from <br /> SB-1 on 4/3/2002. `Groundwater After' concentrations for TPH (gas), benzene, toluene, ethylbenzene total xylenes, and <br /> MTBE are from MW-5A on 7/17/2013. 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: 9 Number retained: 0 monitoring wells and 0 <br /> dual-nested soil va or extraction/airsparge wells <br /> List enforcement actions taken: NOR on 06/14/1996 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: `� - Date: 08/05/2014 <br /> VI Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 02/28/2014 Response Date: 03/27/2014 <br /> RB Staff: James L.L. Barton Response: Concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Active remediation did not occur at this site; remediation occurred by natural attenuation. <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 />