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 :F1 After Before After After Before TPH (Gas) <1.0 NA 1.2 <0.05 Xylenes <0.005 NA <0.50 TPH (Diesel) <1.0 NA X0.05 <0.05 Ethylbenzene <0.005 NA <0.50 <0.0005 Benzene <0.005 NA 0.31 <0.0005 Oil & Grease NA NA NA NA Toluene 0.025 NA <0.30 <0.0005 Heavy Metals 6.1 (Pb) NA NA NA MTBE 1.6 NA 10.0 <0.001 Comments: ALL SOIL SAMPLES COLLECTED AT THE SITE ARE NON-DETECT FOR TPH-G, TPH-D, BENZENE, ETHYLBENZENE & XYLENES, MINOR DETECTIONS OF TOLUENE (MAX. 0.025 PPM IN MW-1 @15 FEET BSG) , HIGHEST MTBE DETECTION IN SOIL, NOTED ABOVE, WAS FROM BORING B-2 @ 20-FEET BELOW SURFACE WHICH IS BELOW GROUNDWATER. NO SOIL SAMPLES WERE COLLECTED AFTER CLEANUP. WATER 'BEFORE' RESULTS FROM BORING B-2, COLLECTED ON 3120100. WATER `AFTER' RESULTS FOR TPH & BTEX ARE FROM THE MONITORING WELLS ON 2123107 AND FOR MTBE ARE FROM THE MONITORING WELLS ON 5123107. 1,2-DCA IS NON-DETECT IN SOIL AND GROUNDWATER. 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 lands use changes? YES MonitoringNapor wells decommissioned: YES Number Decommissioned: 19 Number retained: 0 List enforcement actions taken: NOR List enforcement actions rescinded: NONE V. Locai Agency Representative Data Name: DONNA HFRAN, RFHS Title. DIRECTOR, ENVIRONMENTAL HEALTH DEPT. Signature: Date: L�� - -2 — _- VI. Central Valley Regional Water QuaNy Control Board (RB) Notification Date Submitted to RB: 08/01/08 Response Date: 08/28/08 RB Staff: JAMES L.L. BARTON, PG Response: CONCURRANCE Title: ENGINEERING GEOLOGIST VII. Additional Comments, Data, etc. IN THE CLOSURE SUMMARY REPORT DATED JUNE 17, 2008 AGE ADDRESSED THE ISSUE OF POTENTIAL. SOIL VAPOR INTRUSION; USING THE SFB-RWQCB ENVIRONMENTAL SCREENING LEVELS THE SITE PRESENTS NO THREAT FROM SOIL VAPOR INTRUSION, SITE TO REMAIN A CITY CORPORATION YARD; CLOSEST STRUCTURE TO FORMER TANK PIT AREA IS 90 FEET AWAY. This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official site file.