SITE INFORMATION AND CORRESPONDENCE

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Case Closure Summary Page 2 Le'aking Underground Fuel Storage Tank P,11gram III. Release and Site Characterization Information (continued) Maximum Documented Contaminant Concentrations -- Before and After Cleanup Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) Before After Before After Before After Before After TPH (Gas) 22 180 <0.05 Xyle ne <0.005 <0.e006 <0.0005 TPH (Diesel) NA NA NA Eth [benzene 0.11 <0.0005 <0.0005 Benzene <0.005 <0.0005 <0.0005 Oil &Grease NA NA NA Toluene <0.005 <0.0005 <0.0005 Hea ry Metals NA NA NA MTE E 121 1 1180 <0.001 Comments: Soil before concentrations are from soil boring B6-55' in the source area. No soil confirmation samples were collected after soil vapor extraction remediation or ground water pump and treat. Groundwater before and after concentrations are from on- site well MW-2, which was the most impacted well. IV. Closure Does completed corrective action protect existing beneficial uses pe the Regional Board Basin Plan?Yes Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes Does corrective action protect public health for current land use? Ye Site management requirements: None Should corrective action be reviewed if land use changes? Yes Monitoring/Remediation Wells Decommissioned? Yes Number Decommissioned: 14 Number retained: 0 List enforcement actions taken: NOR sent to RP List enforcement actions rescinded: None V. Local Agency Representative Data Name: Donna Heran, RENS Title: Director Signature: Date: 3- T- VI. Central Valley Regional Water Quality Control Board Notification Date Submitted to RB: 09/27/2011 Response Date: 10/21/2011 RB Staff: J. Barton Response: NFAR Concurrence Title: En ineerin Geologist VII. Additional Comments, Data, etc. This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file.