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wool <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Shell-branded Service Station <br /> 620 West Charter Way, 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) 7,100 NA 2,100 8.1 Xylenes 500 NA 180 0.032 <br /> TPH (Diesel) <10 NA NA NA MTBE 0.023 NA 1.7 0.13 <br /> Benzene 110 NA 42 0.14 1,2-DCA <0.0050 NA 1.5 <0.0005 <br /> Toluene 350 NA 120 0.010 Oil and Grease 110 NA NA NA <br /> Ethylbenzene 100 NA 33 0.015 Lead 1.9 NA NA NA <br /> Comments: The `Soil Before' concentrations for TPH (gas), benzene, ethylbenzene, and total xylenes are from sample NE <br /> Corner Old Excay. @ 19.5 feet on 11/15/1989, toluene from MW-9 @ 20 feet on 03/19/1990, TPH (diesel)from waste oil <br /> tank removal @ 11 feet center on 6/24/1987, MTBE and 1,2-DCA from CPT-19 @ 50 feet on 08/05/2010, and oil and <br /> grease and lead from hoist 1 removal on 11/15/1989. `Soil After' concentrations were not collected. The `Groundwater <br /> Before' concentrations for TPH (gas), benzene, toluene, ethylbenzene, and total xylenes are from CPT-20 @ 50 feet on <br /> 08/06/2010, MTBE from MW-9 on 05/29/2003, and 1,2-DCA from CPT-23 @ 51 feet on 08/05/2010. `Groundwater After' <br /> concentrations for TPH (gas), benzene, toluene, ethylbenzene and total xylenes are from MW-9 on 10/16/2012, MTBE and <br /> 1,2-DCA from MWA 7-50 on 10/16/2012. 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: 20 monitoring wells <br /> List enforcement actions taken: NOR on 10/2/1989, 01/14/1991 and 01/27/2014 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Program Coordinator <br /> Signature: / Date: <br /> VI Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: James L.L. Barton Response: <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Remediation system for soil vapor extraction operated at this site between 1992 and 1996. <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 />