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Case Closure Summary Pages <br /> Leaking Underground Fuel Storage Tank Program <br /> I11 Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations - - Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 690 <0.05 NA NA Xylene 1.1 <0.0006 NA NA <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 0.15 <0.0003 14A NA <br /> Benzene <0.03 <0.0003 NA NA Oil &Grease NA NA A NA <br /> Toluene <0.03 <0.0003 NA NA Heavy Metals PB=14 14 A NA <br /> MTBE <0.02 <0.02 A NA <br /> Comments: SOIL BEFORE CONCENTRATIONS ARE FROM A SAMPLE COLLECTED AT THE TJME OF THE GASOLINE <br /> UST REMOVAL AT 8 FEET BELOW GROUND SURFACE (BGS) ON 8120199. SOIL AFTER CONENTRATIONS ARE <br /> FROM SAMPLES COLLECTED AT 10 AND 15 FEET BGS AFTER SOIL EXCAVATION IN THE GASOLINE UST AREA <br /> ON 1113109. THE LABORATORY REPORTED THOSE SOIL SAMPLES TO HAVE BEEN EXTRACTED AND THE <br /> RESULTS WERE IN UG/L. THE CONTAMINATED SOIL (APPROXIMATELY 25-30 CUBIC YDS.)WAS AERATED ON <br /> SITE AND SAMPLE RESULTS AFTER TREATMENT WERE NON DETECT. A GROUNDWATER INVESTIGATION WAS <br /> NOT REQUIRED SINCE THE CONTAMINATED SOIL WAS LIMITED AND REMOVED WITH NO CONTAMINATION <br /> EVIDENCED AT 10 AND 15 FEET BSG AND HISTORICAL HIGHEST GROUNDWATER LEVEL TO BE 90 FEET BSG. <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: NA <br /> Should corrective action be reviewed if land use changes? NA <br /> Monitoring/Vapor wells: NONE Number Decommissioned: NA Number retained: 0 <br /> List enforcement actions taken: NOR ISSUED TO RP <br /> List enforcement actions rescinded: NA <br /> V. Local Agency_Representative Data <br /> Name: Donna Heran Title: Director of Environmental Health <br /> Signature: Date: 5 6 r O <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: April 11, 2008 Response Date: April 23, 2008 <br /> RB Staff: J. Barton Response: Concurrence <br /> Title: Eng. Geologist <br /> VII. Additional Comments, Data, etc. <br /> SOIL ONLY CASE <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 />