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Vanco Truck Plaza Page 2 <br /> 1033 W. Charter Way, Stockton <br /> Leaking Underground Fuel Storage Tank Program <br /> Case Closure Summary <br /> III Release and Site Characterization Information (continued) August 23, 2010 <br /> Maximum Documented Contaminant Concentrations - Before and After Cleanup <br /> Contaminant Soil Soil Water Water After Contaminant Soil Soil Water Water <br /> Before After Before mgll Before After Before After <br /> mg/kg mg/kg mll mg/kg mg/kg mll m /I <br /> TPH (Gas) 230. NA 190. 0.800 Et ylbenzene 0.19 NA <0.0005 <0.0005 <br /> TPH (Diesel) 5300. NA. 2200. 0.680 X lene 0.15 NA <0.0006 <0.0005 <br /> Benzene <0.05 NA <0.0005 <0.0005 M BE 1.4 NA <0.0005 <0.0005 <br /> Toluene <0.05 NA <0.0005 <0.0005 1, -DCA <0.005 NA <0.0005 <0.0005 <br /> Comments: NO remediation conducted- after soil data lis ed as NA(not applicable). Before soil from <br /> dispenser/island area, 2003 piping upgrade trench soil sample, "P-13" at 6'bgs, except TPHg (boring B3-15' soil <br /> sample, 2003) and 1,2-DCA (all MW-4 and MW-5 soil samples at installation, 2005). Before groundwater from <br /> soil boring "B-4", 2004 and After groundwater from MW-4, 2008. <br /> !V. Closure <br /> Does completed corrective action protect existing beneficial uses per Regional Board Basin Plan? yes <br /> Does completed corrective action protect potential beneficial Uses per 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? es <br /> Have the Monitoring been decommissioned? No Number Decommissioned: 0 Number retained: 7' <br /> List enforcement actions taken: NOR, June 4, 2003 (operator) and September 19, 2003 (landowner) <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: Adrienne Ellsaesser, Lead Senior REHS Title: Acting Program Coordinator, LOP <br /> Signature4-AII <br /> [Da e: <br /> I <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: August 23, 2010 Re ponse Date: <br /> RB Staff: James L.L. Barton Response: <br /> Title: Engineering_ Geologist <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASE CLOSURE LETTER sha I be retained by the lead agency as part of the <br /> official site file. <br /> Mil <br />