SITE INFORMATION AND CORRESPONDENCE

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• Case Closure Summary Page 2 Leaking Underground Fuel Storage Tank Program III. Release and Site Characterization Information (continued) Maximum Documented Contaminant Concentrations-- Before and After Cleanup Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) After Before After After Before After TPH (Gas) 77.0 <1.0 0.067* 0.055* Xylenes <0.025 NA <0.0005 <0.0005 TPH (Diesel) 2,000 <1.0 <0.05 <0.05 Ethylbenzene <0.025 NA <0.0005 <0.0005 <0.1 <0.1 <0.0005 <0.0005 Oil&Grease NA <10 Benzene <0.025 NA Toluene <0.025 NNA NAA <0.0005 <0.0005 Heavy Metals 6.4 (Pb) NA NA NA MTBE <0.025 NA F omments: LEAD RESULT FROM SOIL STOCKPILE SAMPLE; ALL OTHER SOIL 'BEFORE' DATA FROM TANK PIT AMPLE TW-13; SOIL 'AFTER' DATA FROM SOIL BORING B-1. GROUNDWATER DATA FROM MW-1 ON 1117111 AND 18111. *LABORATORY REPORT INDICATES PRIMARILY COMPOUNDS NOT FOUND IN TYPICAL GASOLINE. 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 MonitoringNapor wells decommissioned: NO Number Decommissioned: 0 Number retained: 1 List enforcement actions taken: NOR List enforcement actions rescinded: NONE V. Local Agency Representative Data Name: ADRIENNE ELLSAESSER, REHS Title: ACTING PROGRAM COORDINATOR, UNIT IV Signature: fyDate: VI. Central Valley Regional Water Quality Control Board (RB) Notification Date Submitted to RB: Response Date: RB Staff: JAMES L.L. BARTON, PG Response: Title: 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.