SITE INFORMATION AND CORRESPONDENCE

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1 Case Closure Summary Page } Baking Underground Fuel Storage Tank Prram III Release and Site Characterization.Information (continued) Maximum Documented Contaminant Concentrations -- Before and After Cleanup R Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) Before After Before After Before After Before After TPH (Gas) 1,600 NA 0.490 <0.050 Ethylbenzene 32 NA 0.005 <0.0005 TPH(Diesel) 11,000 NA 0.270 <0.050 Xylenes 210 NA 0.0083 <0.0006 Benzene <0.5 NA 0.0062 <0.0005 MTBE <0.5 NA 0.010 0.012 Toluene 7.6 NA <0.0005 <0.0005 1.2 DCA NA NA . 0.0068 <0.0005 i Heavy metals 1 19 (Pb) I NA I NA I NA Comments: Soil Before analytical data are taken from sample T1-A; Soil After data are not available since confirmation samples were not collected. Water Before analytical data are taken from MW-2 on 8/31100; Water After analytical data are taken from MW-2 on 11112/08. 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 1 E Should corrective action be reviewed if land usechanges? Yes Monitoring/Vapor wells decommissioned: Yes Number Decommissioned: 4 Number retained: 0 List enforcement actions taken: NOR List enforcement actions rescinded: None } V. Local Agency Representative Data Name: Donna Heran, REHS Title: Director Signature: Date: �d I VI. Central Valley Regional Water Quality Control Board (RB) Notification I Date Submitted to RB: March 4, 2011 Response Date: March 10, 2011 RB Staff: James L.L. Barton_ Response:_Concurrence _ Title: Associate Engineering 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.