SITE INFORMATION AND CORRESPONDENCE

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Case Closure Summary %eaking Underground Fuel Storage Tank Pnl' ram 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) 1,000 <20.0 0.21 Xylene 14.0 <0.20 <0.002 TPH (Diesel) NA NA NA Ethylbenzene 0.3 <0.20 <0.002 Benzene <0.025 <0.20 <0.001 Oil &Grease NA NA NA Toluene 0.2 <0.20 <0.002 Pb 2.1 NA NA MTBE 92.9 120 0.39 Comments: THE SOIL BEFORE CONCENTRATIONS ARE FROM A SOIL SAMPLE (TP-1/21) COLLECTED AT 21 FEET BGS BENEATH UST AT THE TIME OF REMOVAL, EXCEPT MTBE SOIL CONCENTRATION IS FROM SB-1 AT 25 FEET BGS IN THE AREA OF FORMER USTs. SOIL CONFIRMATION SAMPLES WERE NOT TAKEN AFTER THE COMPLETION OF THE GROUND WATER EXTRACTION REMEDIATION. GROUND WATER BEFORE AND AFTER CONCENTRATIONS ARE FROM WELL P-1 LOCATED 5 FEET WEST OF THE FORMER USTs. 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: NA Should corrective action be reviewed if land use changes?YES Monitoring/Vapor wells Decommissioned: NO Number Decommissioned: 0 Number retained: 20 List enforcement actions taken: NOR SENT TO RP List enforcement actions rescinded: NA V. Local Agency Representative Data Name: ADRIENNE ELLSAESSER, REHS Title: ACTING PROGRAM COORDINATOR Signature: 4 _ / Date: / VI. Central Valley Regional Water Quality Control Board RB Notification Date Submitted to RB: Response Date: RB Staff: J. Barton Response: Title: Eng. 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. Page 2