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• i• �� Lf <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> 7-Eleven Store No. 19976 <br /> 1399 North Main Street, Manteca, 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 (pprn) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 17,000 NA 290 <0.050 Xylenes 280 NA 28 <0.0005 <br /> TPH (Diesel) NA NA NA NA MTBE 27 NA 11 0.001 <br /> Benzene 15 NA 6.99 <br /> <0.0005 1,2-DCA NA NA <0.0005 NA <br /> Toluene 110 NA 11 <0.0005 EDB NA NA <0.0005 NA <br /> Ethylbenzene 156 1 NA 15.5 1<0.0005 Lead 17 NA <0.01 NA <br /> Comments: The `Soil Before' concentrations for TPH (gas) are from MW-i @ 45 feet on 09/04/1998, benzene, toluene, <br /> ethylbenzene, total xylenes and MTBE are from sample GP-3 @ 35 feet on 04/29/1998, and lead from T2-S-15 @ 15 feet <br /> on 09/19/1996. `Soil After' concentrations were not collected. The `Groundwater Before' concentrations for TPH (gas), <br /> toluene, ethylbenzene, and total xylenes are from GP-3-W @—45 feet on 04/29/1998, benzene from MW-2 on 01/24/2000, <br /> 1,2-DCA and EDB from MW-1 on 12/10/2004, MTBE from MW-2 on 04/04/2002, and lead from MVV-1 Pre on 03/29/2007. <br /> `Groundwater After' concentrations for TPFI (gas), benzene, toluene, ethylbenzene total xylenes and MTBE are from MW-2 <br /> on 01/22/2013. 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: 20 Number retained: 0 <br /> List enforcement actions taken: NOR on 02/17/1998, 04/15/2014 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, RENS Title: Director <br /> Signature: Date: 9/30/2014 <br /> VI Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 4/17/2014 Response Date: 4/30/2014 <br /> RB Staff: James L.L. Barton Response: Concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Remediation by interim vapor e:araction and oxygen injection took place bet,,-veen March 2003 and September 2012. <br /> This document aril Ehe related CASE CLOSURI= t_E"I'TEFt shall be r�taineci by lt�e lead agency as Bart or tl�c �f:"icia�site rile. <br /> Page 2 <br />