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k <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> llI Release and Site Characterization Information (continued) <br />� r <br />€ Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant . Soil (ppm) Water (ppm) Contaminant Soil (ppm) <br /> Water (ppm) <br />€ BeforeAfter Before After Before After Before After <br /> TPH (Gas) 2,800 1,700 FPPH .470 Xylene 220 110 FPPH .013 <br /> TPH (Diesel) NIA NIA NIA NIA Ethylbenzene 230 32 FPPH .0516 <br /> Benzene 98 7.1 FPPH .0148 Oil &Grease NIA NIA NIA NIA <br /> Toluene 75 3.9 FPPH .0038 Heavy Metals NIA NIA NIA NIA <br /> Other NIA NIA NIA NIA TBA UNKNOWN .228 <br /> Comments: PUMP AND TREAT WAS INEFFECTIVE IN REMEDIATION AND SOIL ROMOVED TO 9 FEET BELOW <br /> GROUND SURFACE. GROUNDWATER CONTAMINANT CONCENTRATIONS ARE DECLINING DUE TO NATURAL <br /> PROCESSES. MTBE <5 PPB IN ALL GROUNDWATER MONITORING WELLS. <br /> 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 Plan? (YES) <br /> Does corrective action protect public health for current land use? (YES) <br /> Site management requirements: <br /> Should corrective action be reviewed if land use changes? (YES) <br /> Monitoring/Vapor wells decommissioned: (NO) Number Decommissioned: 7 Number retained: 10 <br /> List enforcement actions taken: LEVEL ONE, NOR SENT TO RESPONSIBLE PARTY <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> i <br /> Name: Margaret Lagorio Title: Supervising REHS1Site Mitigation/LOP Unit IV <br /> Signature: Date: <br /> Vl. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff. MARK LIST Response: <br /> Title: 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 /> I , <br />