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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Ill. Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations-- Before and After Cleanup <br /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPH (Gas) 13.0 <.1 130 <.025 Xylenes 0.32 <.01 <500 <.005 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 21.0 <.005 <500 <.005 <br /> Benzene 15.0 <.005 <500 <.0005 Oil&Grease NA NA NA NA <br /> Toluene 11.0 <.005 <500 <.0005 Heavy Metals NA NA NA NA <br /> MTBE 45.0 <.005 180 <.001 <br /> Comments: GW SAMPLES HAVE BEEN ANALYZED FOR 1,2-DCA AND EDB, RESULTS ALL NON-DETECT. SOIL <br /> `BEFORE' BTEX DATA FROM TANK PIT, TPH & MTBE DATA FROM RW-1 @15 FEET BSG. SOIL `AFTER' RESULTS <br /> FROM GP-7 AND GP-8 CONFIRMATION SAMPLES @ 15 FEET BSG. WATER 'BEFORE' RESULTS FROM RW-1 ON <br /> 4/9/02 PRIOR TO REMEDIATION. WATER'AFTER' RESULTS FROM SECOND QUARTER 2006 GW MONITORING <br /> EVENT. COMPLIANCE WITH THE PUBLIC PARTICIPATION REQUIREMENTS IN SECTION 2728 OF THE CALIFORNIA <br /> CODE OF REGULATIONS HAS BEEN MET. SITE PASSES SFBRWQCB ESL'S FOR SOIL ABOVE CURRENT <br /> GROUNDWATER. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? YES <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? YES <br /> Does corrective action protect public health for current land use? YES <br /> Site management requirements: NONE <br /> Should corrective action be reviewed if land use changes?YES <br /> Monitoring/Vapor wells decommissioned: 0 Number Decommissioned: 0 Number retained: 13 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: MARGARET LAGORIO, REHS Title: PROGRAM COORDINATOR, UNIT IV <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: JAMES L.L. BARTON Response: <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official <br /> site file. <br />