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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 /> TPH(Gas) 4,800 <1.0 <0.050 <0.050 Ethylbenene 140 <0.005 <0.0025 <0.0005 <br /> TPH(Diesel) NA NA NA NA Xylene 770 <0.005 <0.0025 <0.001 <br /> Benzene 68 <0.005 0.0138 <0.0005 MTBE 250 <0.0005 170 <0.0005 <br /> Toluene 500 <0.005 0.000969 <0.0005 <br /> Comments: Soil Before results are from soil beneath the dispenser, S-2 at 9 feet, except the MTBE is from X-1 at 15 feet, <br /> both collected on 4/24/96. Soil After results are from EW1 at 19 feet on 2/24/99. Water Before results are from CPT1 on <br /> 7/15/98 at 32 feet. Water After results are from MW 1 on 4/8/05. Groundwater extraction, treatment and disposal to public <br /> sewer were conducted from March 2000 until July 2001. <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 decommissioned: YES Number Decommissioned: 11 Number retained: 0 <br /> List enforcement actions taken: NOR APRIL 24, 1996 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: Donna Hera S Title: Director of Environmental Health Department <br /> Signature: Date: <br /> VI. C tr alley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: June 5, 2007 Response Date: July 19, 2007 <br /> RB Staff:James L.L. Barton Response: No Further Action Required Concurrence <br /> Title:Associate 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 />