SITE INFORMATION AND CORRESPONDENCE

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t Case Closure Surnmary Page 'Ceaking Underground Fuel Storage Tank Peogram III. Release and Site Characterization Information continue ) 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 Xylene <0.005 <0.0006 <0.0005 TPH (Diesel) NA NA NA Et ylbenzene 0.11 <0.0005 X0.0005 Benzene <0.005 <0.0005 <0.0005 Oil & Grease NA NA NA Toluene <0.005 <0.0005 <0.0005 Heavy Metals NA NA NA M BE 21 180 <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 per 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? Yes Site management requirements: None Should corrective action be reviewed if land use changes? Yes Monitoring/Remediation Wells Decommissioned? No Number Decommissioned:0 Number retained: 14 List enforcement actions taken: NOR sent to RP List enforcement actions rescinded: None V. Local Agency Representative Data Name: Adrienne Ellsaesser, REHS Tit e: Acting Program Coordinator [!S!Knature: ��LG /�� Date: VI. Central Valley Regional Water Quality Control Board Noti ication Date Submitted to RB: Response Date: RB Staff: J. Barton Response- Title: e ponse:Title: Engineering Geologist VII. Additional Comments, Data, etc. This document and the related CASE CLOSURE LETTER shall be retair ed by the lead agency as part of the official site file.