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Case Closure Summary Page <br /> a..aaking Underground Fuel Storage Tank P% .,tram '6; A, I <br /> III 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) 3,000 Xylene 240 <br /> TPH(Diesel) N/A Ethylbenzene 32 <br /> Benzene 3.2 Oil &Grease 520 <br /> Toluene 43 Heavy Metals <br /> MTBE ND <br /> Comments: 'AFTER' MAX CONTAMINANT LEVELS AT 10' bsg. ATTENUATION WITH DEPTH TO 92ppm TPHg AT <br /> 25' bsg. NO REMEDIATION WAS PERFORMED AT THIS SITE, CONTAMINANT LEVELS NOTED ARE FROM AN <br /> EXPLORATORY GEOPROBE INVESTIGATION AND ARE REPRESENTATIVE OF CURRENT RESIDUAL SOIL <br /> CONTAMINATION. GROUNDWATER IS GENERALLY GREATER THAN 100' bsg IN THIS AREA OF THE COUNTY. <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: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: MARGARET LAGORIO, REHS Title: SUPERVISOR, SITE MITIGATION UNIT <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 03/30/00 Response Date: 05/08/00 <br /> RB Staff: MARTY HARTZELL Response: CONCURRANCE <br /> Title: ASSOCIATE 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 />