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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank.Program <br /> ill Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> [Contaminant Soil (pprn) Water (pprti) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> PH (Gas) 140 140 2.7 <0.050 Xylene <br /> 0.04 0:04 0.034 <0.0005 <br /> TPH(Diesel) NA 3000 0.081 0.051 Ethylbenzene 0.02 0.02 0.0218 <0.0005 <br /> Benzene 0.01 0.01 0.0045 <0.0005 Oil &Grease NA NA NA NA <br /> Toluene 0.04 0.04 0.0021 <0.0005 Heavy Metals NA NA NA NA <br /> MTBE 1.7 11.7 77.0 .0061 . <br /> Comments: The before soil concentrations are from boring SB10-2 at 11 feet on 817189, except MTBE which is from CPT1 <br /> at 20 feet in 12101. The after soil concentrations are the same as the before since the areas did not have soil remediation, <br /> except the TPH-diesel result which is from D2-collected 3 feet below a dispenser in 3104. 'The laboratory-noted the diesel <br /> result does not meet the laboratory standard for diesel. Previous TPH concentrations not matching the laboratory standard <br /> were identified as Stoddard solvent or paint thinner. The before and after groundwater concentrations are from MW-1 A the <br /> most contaminated, down-gradient data point. Neither 1,2 DCA nor EDB have been detected in soil or groundwater <br /> samples analyzed. 400 cubic yards of soil were excavated and 206,500 gallons of water were extracted during interim <br /> remediation at this site. Groundwater contaminant concentrations have declined over time. Compliance with the Public <br /> Participation requirements in Section 2728 of the California Code of Regulations has been met. <br /> IV. Closure <br /> Does completed corrective.action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> Does competed 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: NA <br /> i <br /> Should corrective action be reviewed if land use changes?Yes <br /> MonitoringNapor wells decommissioned: Yes Number Decommissioned: 3 Number retained: 3 <br /> List enforcement actions taken: NOR sent to RP <br /> List enforcement actions rescinded: NA <br /> t <br /> V. Local Agency Representative Data <br /> i <br /> Name: Margaret Lagorio Title: Program Coordinator Unit IV, REHS <br /> t. <br /> Signature: Date:'•- <br /> VI. Central Valley Regional Water Quality Control Board RB Notification . <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: <br /> li Title: Eng. 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 />