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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 Sire Characterization Information continued <br /> Maximum Docuriented 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) 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 <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 56 NA 5.5 <0.0005 Lead 17 NA <0.01 NA <br /> Comments: The 'Soil Before' concentrations for TPH (gas) are from MW-1 @ 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. '3oil 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 ED 3 from MWA on 12/10/2004, MTBE from MW-2 on 04/04/2002, and lead from MWA Pre on 03/29/2007. <br /> 'Groundwater After' concentrations for TPH (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 managemer-t requirements: None <br /> Should corrective action be reviewed if land use changes? Yes <br /> Monitoring/Vapo-wells decommissioned: No Number Decommissioned: 0 Number retained: 20 <br /> List enforcemem actions taken: NOR on 02/17/1998, 04/15/2014 <br /> List enforcemen-:actions rescinded: None <br /> V. Local A enc Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Program Coordinator <br /> Signature: Date: � <br /> VI Central Yglley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: JameE L.L. Barton Response.- <br /> Title: <br /> esponse:Title: Engineerirg Geologist <br /> VII. Additional Comments, Data, etc. <br /> 11 Remediation by interim vapor extraction and oxygen injection took place between March 2003 and September 2012. <br /> This document a id the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br /> pan,9 <br />