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Case Closure Summary Page 2 U <br /> Leaking Underground Fuel Storage Tank Program <br /> k 111. Release and Site Characterization Information (continued) . <br /> E Maximum Documented Contaminant Concentrations-- Before and After Cleanup <br /> Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> Contaminant Soil Before (Ppm) After Before After <br /> After Before After 950 0.025 <.0005 <br /> TPH(Gas) 6,700 9,800 0.613 <.05 Xylenes 71078 0.0055 <.0005 1 <br /> NA NA NA Ethylbenzene 71 N <br /> TPH(Diesel) <5 <,0005 Oil&Grease NA NA NA NA <br /> Benzene <5 <2.5 0.014 NA NA NA <br /> 47 52 <0005 <.0005 Heavy Metals NA 0.17 0.0009 <br /> Toluene MTBE 1.71 0.41 <br /> ESULTS <br /> Comments: SOIL' FORE' RESULTS FROM PIPING ATER `B1<FORERADE SAMpRESU OS ARE THE HIGHTEST DEI7ECTIONS <br /> DISPENSER AREA OVEREXCAVATION SAMPLES <br /> NOTED AT THE SITE; WATER'AFTER' RESULTS FROM 12101105. <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 installed: YES Number Decommissioned: 0 Number retained: 3 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> ,i <br /> Name: MARGARET LAGORIO, REHS Title: SUPERVISOR, SITE MITIGATION:UNIT <br /> Signature: Date: 4 + <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 /> REVISED ESTIMATE OF CONTAMINANT MASS REMAINING IN THE SOIL IS 237 LBS TPHg AND 0.04 LBS MTBE. <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 />