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Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> III. Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> (Ppm) Water (ppm) 7Ethylbenzene <br /> Soil (ppm) Water <br /> q)o <br /> Contaminant Soil rn) Before After Before Before After Before After TPH(Gas) 1,700 NA 18 <0.050 28 NA 0.016170 NA 0.079 <br /> TPH(Diesel) NA NA NA NA 0.12 NA 24 0.0038Benzene 11 NA 0.034 <0.0005 <br /> Toluene 80 NA 0.037 <0.0005 <br /> Comments: Soil Before concentrations are from soil collected on 08/09/90 in the trench beneath a dispenser where the leak <br /> occurred, except the MTBE result is from soil boring ATC-6 collected on 03/01/99 at 18 feet bsg; Active remediation did not <br /> take place and 'Soil After' results do not exist. Water Before results for TPH (Gas) are from MW-2 collected on 06/07/99; <br /> benzene results are from MW-1 collected on 09/14/90; toluene results are from MW-1 collected on 08/24/90; ethylbenzene <br /> and total xylenes results are from MW-2 collected 03/16/95; and MTBE results are from MW-2 collected on 12/03/98. Water <br /> After results are from MW-2 collected on 09/02/10. NA—not analyzed <br /> IV. Closure <br /> Does completed corrective action protect existing beuses 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: Yes Number Decommissioned: 12 Number retained: 0 <br /> List enforcement actions taken: NOR; 08/30/90 and 08/05/08 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date: 10/19/2012 <br /> cyvh..c1. <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 01/19/2012 Response Date: 02/14/2012 <br /> RB Staff: James L.L. Barton, PG Response: Concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> Soil Gas Survey conducted:i- July 1992. Vapor intrusion was addressed in the Site Conceptual Model dated November <br /> 2006. <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 />