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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 - e 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) 7,700 NA 340 0.270 Xylenes 910 NA 13 0.055 <br /> TPH (Diesel) 5.2 NA NA NA MTBE <0.005 NA 0. 19 <0.0005 <br /> Benzene 13 NA 3.2J 0.021 1 ,2-DCA 0.0053 NA 0.66 0.012 <br /> 'toluene 460 NA 4.4J 0.0069 EDB <0.005 NA <0.010 NA <br /> Ethylbenzene 170 NA 2.3,1 0.079 Lead 28 NA NA NA <br /> Comments: The 'Soil Before' concentrations for TPH (gas), toluene, ethylbenzene, and total xylenes are from sample AS-3 <br /> (B-27) @ 36 feet on 08/10/95, TPH (diesel) from MW-15 at 36. 5 feet on 08/16/07, benzene from B1 @ 45 feet on 05/24/91 , <br /> MTBE and EDB from DI-3-4 @ 5 feet on 11 /29105, 1 ,2-DCA from MW13 @ 50 feet on 07/06/06 and lead from T2A @ 16 <br /> feet on 08/20/93. 'Soil After' concentrations were not collected. The 'Groundwater Before' concentrations for TPH (gas) <br /> and xylenes are from VW-1 on 05/20/97, benzene from VW-10 on 12/10/03, toluene and ethylbenzene from VW-10 on <br /> 12/21/04, MTBE from MW-2 on 09/02/99, and 1 ,2-DCA and EDB from VW-5 on 03/06/03. 'Groundwater After' <br /> concentrations for TPH (gas), benzene and MTBE are from VW-10 on 09/05/12 , toluene, ethylbenzene, and xylenes from <br /> VW-10 on 03/02/11 , and 1 ,2-DCA from VW-5 on 09/05/12 . 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: Yes Number Decommissioned : 3 MWs and 1 VW Number retained : 20 MWs <br /> 11 VWs, 3 nested AS and 3 AS wells <br /> List enforcement actions taken : NOR on 08/13/91 , 05/07/99 and 09/07/07 <br /> List enforcement actions rescinded: None <br /> V. Local Aqency Representative Data <br /> Name: Adrienne Ellsaesser, REHS Title: Program Coordinator <br /> Snature: � (96r�. Date: � ZG/i3 <br /> VI Central Valle 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 systems for soil vapor extraction and air sparging operated intermittently at this site between November 1994 <br /> and November 1997; air sparging restarted in January 1998 and continued until the fourth quarter 2009. <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 />