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r <br /> 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 /> Maxirriune 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) 19 ,000 NA 392 64 Xylenes 21200 NA 32 .8 '12 .0 <br /> TPH ( Diesel ) <1 . 0 NA NA NA MTBE r11800 NA 0. 10 0 . 011 <br /> (Benzene 30 NA 8 . 1 0. 950 112 -I)CA 0. 141 NA 1 .640 0. 079 <br /> Toluene 10100 NA 21 3 . 3 EDB <0.0050 NA 0.350 <040005 <br /> Ethyibenzene 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 1 '1 /03/2005, benzene from SB-2&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 ST4 @ 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=I on 08/02/2000, benzene from Sia-34 @ 68 feet on 07/29/20 '10 , <br /> toluene from S-1 on 11 /23/1998, ethylbenzene from S-1 on 06/04/2012 , MTBE from 3-6 on 05/05/2004 and 06/0512007 , <br /> 1 , 2-DCA from SB4 @ 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 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 /> 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 j <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 enc Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Program Coordinator <br /> i <br /> Signature: / l - r Date: <br /> VI Central Valley Regional Water Quality Control Board RB Notification ! <br /> Date Submitted to RB : Response Date: <br /> RB Staff: Cori Condon Response, I <br /> Title: Senior Engineering Geologist <br /> VII , Additional Comments, Data , etc. <br /> A groundwater extraction pump test was performed at this site in March 20046 and approximately 1 . 9 pounds of TPH gas <br /> were removed during the test. <br /> 'this document: and the related CASE CLOSURE LET T ER ohall be retained by the Icad agency as part of the official site f1104 <br /> Page 2 <br /> I <br />