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Case Closure Summary <br /> �eaking Underground Fuel Storage Tank Program <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) 10,200 NA 180 0.69 Xylenes 1,020 NA 13 0.0014 <br /> TPH (Diesel) NA NA NA NA MTBE NA NA 0.48 <0.0005 <br /> Benzene 0.54 NA 0.83 <0.0005 1,2-DCA NA NA <0.002 <0.0005 <br /> Toluene 220 NA 8.7 <0.0005 EDB <0.01 NA <0.002 <0.0005 <br /> Ethylbenzene 180 NA 2.4 0.0067 Lead 11 NA NA NA <br /> Comments: The 'soil before' concentrations are taken from sample 2E @ 14.5 ft. on 03/26/91 for TPH-g, toluene, <br /> ethylbenzene, total xylenes, EDB, and lead; and TH-1 @ 15.5-16 ft. on 07/28/93 for benzene. Active remediation did not <br /> occur and 'Soil after' concentrations were not collected. The 'groundwater before' concentrations are taken from MW-3 on <br /> 03/28/94 for TPH-g and ethylbenzene, MW-3 on 08/25/93 for benzene, MW-3 on 08/16/95 for toluene, MW-3 on 09/15/94 <br /> for total xylenes, MW-3 on 04/24/02 for MTBE (incorrect result in the table), and MW-3 on 07/10/03 for 1,2-DCA and EDB. <br /> The 'groundwater after' concentrations are taken from MW-2 on 04/01/10 for TPH-g, benzene toluene, ethylbenzene and <br /> total xylenes (concentrations are reversed for ethylbenzene and total xylenes in the table), and MW-2 on 01/08/09 for MTBE, <br /> 1,2-DCA and EDB. 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: 6 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Acting Program Coordinator <br /> Signature: Date: 4 �L ! <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: Associate Engineering Geologist <br /> VII. Additional Comments, Data, etc. <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 />