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Case Closure Summary Page 2 <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 /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH(Gas) <1.0 <1.0 2.2 0.38 Ethylbenene 0.0052 <0.005 <0.0005 <0.0005 <br /> TPH(Diesel) NA NA NA NA Xylene 0.056 <0.005 <0.0005 <0.0005 <br /> Benzene <0.005 <0.005 0.0011 <0.0005 MTBE 0.094 <0.005 <0.0005 <0.0005 <br /> Toluene <0.005 <0.005 <0.0005 <0.0005 Lead 5.9 NA NA NA <br /> Comments: The soil before concentrations for gas and BTEX are taken from sample T-1-S-14; the soil before concentration <br /> for MTBE is taken from sample T-1-S-16; the soil before concentration for lead is taken from sample T-2-S-14. The soil <br /> after concentrations are from sample S-65-SBI. The groundwater before and groundwater after concentrations are from <br /> MW-1 collected on December 9, 2006, and December 28, 2009, respectively. NA—notanalyKed <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: 1 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date: 12/07/10 <br /> 1,) ��� 16 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 07/29/10 Response Date: 09/09/10 <br /> RB Staff: James L.L. Barton, PG Response: Concurrence <br /> Title: Associate Engkneerin2 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 <br /> site file. <br />