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Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Fremont Shell Station <br /> 2494 East Fremont Street, Stockton, CA <br /> III. Release and Site Characterization Information continued <br /> 7rBenzene30 <br /> nted Contaminant Concentrations --Before and After Cleanup <br /> Soil (ppm) Water (ppm) Contaminant Soil (ppm) F32.8 <br /> (ppm) <br /> Before After Before After Before After After <br /> 19,000 NA 392 64 Xylenes 2,200 NA 12.0 <br /> <1.0 NA NA NA MTBE 1,800 NA 0.10 0.011 <br /> NA 8.1 0.950 1,2-DCA 0.141 NA 1.640 0.079 <br /> Toluene 1,100 NA 21 3.3 EDB <0.0050 NA 0.350 <0.0005 <br /> Ethylbenzene 460 NA 8.3 1.7 Lead 19 NA NA NA <br /> Comments: The 'Soil Before' concentrations for TPH (Gas), toluene, ethylbenzene and xylenes are from sample SB-26- <br /> 40.5' @ 40.5 feet on 11/03/2005, benzene from SB-26-60.5' @ 60.5 feet on 11/03/2005, TPH (Diesel)from TP-7-10 @ 9 to <br /> 10 feet on 04/21/2005, MTBE from SE-8 @ 19.0 feet on 04/25/1996, 1,2-DCA and EDB from SB-4 @ 70 feet on 12/13/1999, <br /> and lead from ST-4 @ 5 feet on 04/25/1996. 'Soil After' concentrations were not collected. The 'Groundwater Before' <br /> concentrations for TPH (gas)and xylenes are from S-1 on 08/02/2000, benzene from SB-34 @ 68 feet on 07/29/2010, <br /> toluene from S-1 on 11/23/1998, ethylbenzene from S-1 on 06/04/2012, MTBE from S-6 on 05/05/2004 and 06/05/2007, <br /> 1,2-DCA from SB-4 @ 72 feet 12/13/1999, and EDB from S-1 on 10/28/2002. 'Groundwater After' concentrations for TPH <br /> (gas), benzene, toluene, ethylbenzene, xylenes and 1,2-DCA are from S-1 on 06/18/2013, MTBE and EDB are from S-6 on <br /> 06/18/2013. 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: No Number Decommissioned: 0 Number retained: 10 <br /> List enforcement actions taken: NOR on 04/29/1996, 11/29/2005 and 8/07/2012 <br /> List enforcement actions rescinded: None <br /> V. Local A ency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Program Coordinator <br /> Signature: ' Date: <br /> VI Central Valley Re ional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: Cori Condon Response: <br /> Title: Senior Enclineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> A groundwater extraction pump test was performed at this site in March 2004 and approximately 1.9 pounds of TPH gas <br /> were removed during the test. <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 />