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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 /> Fa Documented Contaminant Concentrations --Before and After Cleanup <br /> nt Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> 4000 ND FP ND Ethylbenene 210 .500 FP ND <br /> TPH (Diesel) 5000 5000 FP .770 Xylene 810 2.8 FP ND <br /> Benzene 45 .022 FP ND TCE .012 ND <br /> Toluene 470 .200 FP ND PCE .004 ND <br /> MTBE NA ND <br /> Comments: The soil before and after concentrations for TPH-d are from beneath the waste oil tank. This area was never <br /> remediated. Chlorinated solvents were not found in the soil samples collected from the soil borings but low levels were <br /> found after excavation of the former multiple tank area. FP (free product)was in MW1 prior to remediation. MW1 was <br /> destroyed prior to excavation. MW1 R groundwater samples did not detect any contaminants. See the closure report for <br /> other halogenated volatile organics detected in groundwater. <br /> ND (non detect) <br /> NA(not analyzed) <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: 3 Number retained: 6 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising REHS <br /> Signature: Date: r C J�� cl <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: P. Anderson Response: <br /> Title: Hydrogeologist <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 />