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Case Closure Summary n Page 2 <br /> Leaking Underground Fuel Storage Tank Pro-gram <br /> III. Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) <br /> Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before d After <br /> TPH (Gas) 2100 unknown 4.3 4.2 Xylene 7 unknown .019 .0074 <br /> TPH (Diesel) NA NA NA NA Ethy benzene <0.06 unknown .022 .0062 <br /> Benzene <0.06 unknown .0096 .0082 Oil & Grease NA NA NA NA <br /> Toluene <0.06 unknown .0082 .0045 Heavy Metals PB=11 NA NA NA <br /> MTBE 1600 unknown <0.001 <0.001 <br /> Comments: The soil before concentrations are from a GeoProbe soil sample P22-10 collected from beneath the former UST <br /> dispenser at 10 feet bgs (except Pb concentration which was from a 5oil sample collected at time of UST removal). No site <br /> remediation was performed and no confirmation soil sampling was completed; no soil after concentrations are available. The <br /> water before and water after concentrations are from MW-8 which is located down-gradient within 10 feet of the former UST <br /> 1 <br /> and dispenser. i <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses pei 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?Ye <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes? Yes <br /> MonitoringNapor wells decommissioned: Yes Number Decommiss oned: 9 Number retained: 0 <br /> List enforcement actions taken: Site placed in LOP and NOR sent to RPS <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS FT1tl <br /> : Director <br /> Signatur . Da e: <br /> VI. Central Valley Regional Water Quality Control Board RB Notific tion <br /> Date Submitted to RB: November 17, 2011 Response Date: December 2, 2011 <br /> RB Staff: J. Barton Response: NFAR Concurrence <br /> Title: Eng, Geologist <br /> VII. Additional Comments, Data, etc. <br /> This was the second LOP Case (East) for this Site. The other LOP C ase (West) received an NFAR on 07/20/2010 <br /> No other UST Cases are currently open at this Site <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 />