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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program } <br /> Ili Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Con#aminant Soil (ppm) Water {ppm) Contaminant Soil {ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 870 <5 0.590 <0-.05 Xylene 4.2 <0.01 <0.0005 X0.0005 <br /> TPN (Diesel) 14,000 8100 440 '3:6 Ethylbenzene <1.2 <.005 50.0005 <0.0005 <br /> Benzene <t.2 <0.005' <0.0005 <br /> <0:0005 Oil &Grease NA A NA NA NA <br /> Toluene 1.3 <0.005 <0.0005 . <0.0005 Meavy Metals NA NA NA NA <br /> MTBE <0,1 <;005 0002 NA <br /> Comments: The Soil Before concentrations are from MW 2 at 20 feet below surface. The Soil After concentrations are from <br /> an excavation sample (EXE-East)taken at 28 feet bsg after approximately 1200 cubic yards of soil were removed except <br /> TPH gas is from MW 12. The Water Before concentrations are from MW 2 on 8111105 before it was destroyed, except the <br /> MTBE is from MW2 on 8115198. The Water After concentrations for TPH are from MW 3 on 3/5109 and the BTEX <br /> concentrations are from MW3 on 6119108. <br /> r . <br /> IV. Closure <br /> -Does-completed corrective-action protect-existing beneficial-uses-per ihe-Regional-Board-Basin-Plan?Yes- _ <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan?Yes <br /> 4 R. <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 /> MonitoringNapor wells decommissioned: No Number Decommissioned: 0 Number retained: 10 <br /> List enforcement actions taken: First level; NOR sent to RPs. <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data .... <br /> Name: Margaret Lagorio Title: Program Coordinator <br /> i Signature: Date: /Q 7 cl <br /> i - J <br />`. VI. Central Valley Re ional Water QUallify.Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: <br /> Title: En2. 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 />