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r Leaki'nd Underground Fuel Storage Tank Pr gram <br /> III Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations - Before and After Cleanup (OVER-EXCAVATION) <br /> p <br /> minant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> as) 8,300 10,000 1,900 0.130 Xylene 2,602 900 74 <0.001 <br /> iesel) 29,800 NA NA 0.130 MTBE NA <1 <.0005 <0.0005 <br /> ne 37 5.9 3.1 <0.0005 1,2-DCA NA <1 NA <0.0005 <br /> e 1097 200 7.4 <0.0005 <br /> enzene 323 160 64 <0.0005 <br /> ents NA= not analyzed. <br /> efore" data is from UST removal in 1990, except TPHg at 8,300 mg/kg is from soil boring "PB-19" and <br /> ne at 37 mg/kg is from soil boring "PB-15" in 2001. Soil "afterdata is from post excavation pit sample S- <br /> -20 in 2004. Water"before" data for benzene and MTBE is from MW9 on 10/17/01, for TPH, toluene, <br /> enzene and xylene is from boring "PB-8" in 1996. Water"after" data is from last ground water sampling <br /> event, Oct-2008. Excavation of the contaminated soil and extraction of groundwater in 2004 reduced the total <br /> mass of contaminants remaining in soil that could leach into the groundwater and contaminated groundwater. <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? Yes <br /> Have the Monitoring/Vapor wells been decommissioned? No Number Decommissioned: 0 <br /> Number retained: 9 <br /> List enforcement actions taken: NOR 03-20-1992 <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Program Coordinator <br /> Signature: Date: 5- (o O <br /> Id 6=2 <br /> VI. Central Valley Regional Water Quality 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 /> Soil vapor intrusion samples taken May 2007. All samples below residential ESLs. <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 />