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Case Closure Summary Par <br /> �. il_eaking.Underground Fuel Storage Tank Wgram <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) 1.4 NO Xylene .016 NO <br /> TPH(Diesel) 8.6 .11 Ethylbenzene NO NO <br /> Benzene NO NO Oil &Grease NA NA j <br /> Toluene NO NO Heavy Metals NA NA <br /> MTBE NO NO <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. <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 /> MonitoringNapor 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 List enforcement actions rescinded: NONE 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: J I f <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: MARTY HARTZELL Response: <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 />