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«. Case Closure Summary Pag <br /> eaking Underground Fuel Storage Tank ram <br /> 9 <br /> III Release and Site Characterization Information (continued) <br /> r. Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (pprn) <br /> Before After Before After Before After Before After <br /> ITPH(Gas) 1.4 ND Xylene .016 ND <br /> TPH (Diesel) 8.6 .11 Ethyibenzene ND ND <br /> Benzene ND ND Oil &Grease NA NA <br /> Toluene ND ND Heavy Metals NA NA <br /> i.: <br /> MTBE ND ND <br /> Comments:RESULTS ARE FROM GEOPROBE INVESTIGATION WITH ONE GRAB GROUNDWATER SAMPLE <br /> COLLECTED IN JAN-FEB 2000. TWO MONITORING WELLS FOR ANOTHER INVESTIGATION ARE LOCATED <br /> DOWNGRADIENT FROM THIS SITE. ANALYTICAL RESULTS FROM THOSE WELLS INDICATE THAT MIGRATION OF <br /> THE DISSOLVED PHASE DIESEL FROM THIS SITE HAS LIKELY NOT OCCURRED. i <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 Pian? 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 List enforcement actions rescinded: NONE 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: DONNA HERAN Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: Date: 3_U I <br /> 3i <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 03/07/01 Response Date: 03/23/01 <br /> RB Staff: MARTY HARTZELL Response: CONCURRENCE <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 />