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t° 'Case Closure Summary Page 2 <br /> Leaking underground Fuel forage Tan.. ;`ogram <br /> III Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations --Befor i and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> Before After Before After I After Before After <br /> TPH (Gas) 1000 <100 FP <.10 Xylene 330 <,015 FP <.0012 <br /> TPH (Diesel) NIA NIA NIA NIA Ethylbenzene 65 <.005 FP x.0006 <br /> Benzene .8 <.005 FP <,0006 Oil&Grease NIA NIA NIA NIA <br /> Toluene 170 <.005 FP <.0006 Heavy Metals NIA NIA NIA NIA <br /> MTBE UNKNOWN <.05 UNKNOWN 0047 <br /> Comments: <br /> GASOLINE SOURCE APPEARS TO BE IN AREA OF VW35 AT 50' BGS. VES REMOVED 106,065 LBS FROM 1989- <br /> 1995. TWO CONFIRMATION BORINGS IN AREA OF CONTAMINATION INDICATES LOW RESIDUAL IN SOIL. MWS <br /> ARE BELOW DETECTION LIMITS FOR GASOLINE. MTBE WA i DETECTED AT 4.7 PPB IN MW#30. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses pl r 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: <br /> Should corrective action be reviewed if land use changes? YES <br /> Monitoring/Vapor wells decommissioned: YES Numbl r Decommissioned: 48 Number retained: 0 <br /> List enforcement actions taken:. LEVEL ONE, NOR SENT TO RESPONSIBLE PARTY <br /> I <br /> List enforcement actions rescinded: <br /> V. Local Agency Representative Data <br /> Name: DONNA HERAN Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification I <br /> Date Submitted to RB: 04/29/97 Rasponse Date: 05/29/97 <br /> RB Staff. JAMES BRATHOVDE R6sponse: NO FURTHER ACTION <br /> Title: HYDROGEOLOGIST CONCURRENCE <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 />