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E' <br /> Case Closure Summary Page <br /> �eaking Underground Fuel Storage Tank Pham <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations -- Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant 1 Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH(Gas) 28,000 240 150 .220 Xylene 1,400 28 270 .020 <br /> TPH(Diesel) NA NA NA NA Ethylbenzene 250 3.7 4.7 .003 <br /> Benzene 230 .01 9.4 .00055 Oil &Grease NA NA NA NA <br /> Toluene 1,200 3.1 23.0 K.05 Heavy Metals NA NA NA NA <br /> MTBE NA .0083 3.8 .15 <br /> Comments: SOIL BEFORE RESULTS FROM TANK PULL SAMPLES COLLECTED 2128189. SOIL AFTER RESULTS . <br /> FROM CONFIRMATION BORING SOIL SAMPLES COLLECTED 3110100. WATER BEFORE RESULTS FROM MW2 ON <br /> 8120/98. WATER AFTER RESULTS FOR TPH—G, BENZENE, TOLUENE, ETHYL-BENZENE FROM MW 1 ON 7124100 <br /> AND FOR XYLENE, MTBE FROM MW2 ON 7124100. <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 lartd use changes? YES <br /> Monitoring/Vapor wells decommissioned: NO Number Decommissioned: 0 Number retained: 14 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: MARGARET LAGORIO, RENS Title: SUPERVISOR, SITE MITIGATION UNIT <br /> Signature:`-1'1' � - Date: j - -y <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 />