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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) <1. <1. 5.9 <0.050 Xylene 29 <0.005 0.670 <0.0006 <br /> TPH (Diesel) 300. <1. <0.050 <0.05 MtBE <0.05 <0.005 40. <0.001 <br /> Benzene <0.005 <0.005 0.140 <0.0005 1,2-DCA NA NA NA <0.0005 <br /> Toluene 0.073 <0.005 0.380 <0.0005 TBA <0.1 <25. <2. <0.01 <br /> Ethyl-benzene 0.068 <0.005 0.030 <0.0005 <br /> Comments: Soil Before is from stock pile samples at the time of the tank removals on 3/5/99. Soil After is from <br /> monitoring well installations in July 2000, except MTBE that is from B1 on 5/23/05. Water Before is from ground <br /> water grabs from tank pit at time of removal in March 1999. Water After is data from last ground water <br /> monitoring sampling event of September 2008. No active remediation conducted at site. <br /> IV. 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? No <br /> Have the Monitoring/Vapor wells been decommissioned? No Number Decommissioned: 0 <br /> Number retained: 5 <br /> List enforcement actions taken: NOR / 3-9-1999 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Program Coordinator <br /> Signature: ,� .� Date: <br /> VI. Central Valley Regional Water Qualit Control Board (RB) Notification <br /> Date Submitted to RB: Response 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 shall be retained by the lead agency as part of the <br /> official site file. <br /> MI/ 5/09 <br />