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%—.01 %._/ <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations - - Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPM (Gas) 1500 5.2 1.3 <0.05 Xylene 170 .13 0.048 <0.001 <br /> TPH(Diesel) NA NA NA NA Ethylbenzene 33 0.52 0.012 <0.0005 <br /> Benzene <.005 <0.005 0.0028 <0.0005 Oil S Grease NA NA NA NA <br /> Toluene 11.1 <0.005 10.0063 <0.0005 1 MTBE I NA I NA 1 <0.002 <0.0005 <br /> Comments: The soil and ground water before concentrations are from Geoprobe B-3 at 12 feet below grade in the former <br /> UST area prior to excavation. The after soil concentrations are from the sample collected from the bottom of the excavation <br /> at 12 feet below grade after removal of the contaminated soil. The after ground water concentrations are from MW 1 R that <br /> was installed approximately 10 feet down-gradient of the former UST area after the excavation and removal of the <br /> contaminated material. Groundwater results have been non-detect in all four monitoring well samples for one full season (4 <br /> quarters)of sampling. <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: 5 Number Decommissioned: 5 Number retained: 0 <br /> List enforcement actions taken: NOR sent to RP. <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 12/08/08 Response Date: 12/22/08 <br /> RB Staff: J. Barton Response: Concurrence <br /> Title: Eng. Geologist <br /> Vli. Additional Comments, Data, etc. <br /> FE7_� :::]I <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 />