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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)After Contaminant Soil (ppm) Water (ppm) <br /> Before After Before Before After Before After <br /> TPH (Gas) 710 <1.0 77 2 0.12 Ethylbenene 0.58 <0.005 2.9 <0.0005 <br /> TPH (Diesel) 2,900' 1.24702 <0.0505 i Xylene 1.12 <0.0054 172 <0.00065 <br /> Benzene 0.32' <0.0054 7.892 <0.00055 MTBE 1.22 0.174 3.62 0.135 <br /> Toluene 1.3' <0.0054 6.02 <0.00055 -ETRE 0.152 <0.0054 0.182 <0.0015 <br /> TBA 0.213 0.0784 0.0423 <0.0105 <br /> Comments: <br /> NA: Not analyzed <br /> ' `Before' concentration from pipe line removal <br /> 2`Before' concentration from tank removal <br /> 3'Before' concentration from soil boring P-5 <br /> 4 After' concentration from monitoring well installations <br /> 5'After' concentration from June 2005 groundwater sampling event <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: 0 Number retained: 9 <br /> List enforcement actions taken: NOR 12/30/99 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervisor REHS <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality ontrol Board (RB) Notification ll <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 <br /> site file. <br /> s <br />