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,,Case Closure Summary Page 1 of 2 • • <br /> Leaking Underground Fuel Storage Tank Program <br /> III Release and Site Characterization Information (continued) <br /> fMaximum Documented Contaminant Concentrations-- Before and After Cleanup (Results in parts per million) <br /> ntaminant Soil Soil Water Water Contaminant Soil Soil Water Water <br /> Before After Before After Before After Before After <br /> (Gas) <1.0 <10 .064 Xylene .071 Z1 .0005 <br /> (Diesel) 1.2 <.05 NA MTBE 2.2 29. .055 <br /> Benzene <.0025 <.1 <.0005 1,2-DCA <0.005 NA <0.0005 <br /> Toluene .16 <.1 <.001 <br /> Ethyl-benzene .019 <.1 <.001 <br /> Comments:Soil Before results are from SB1 at 20 feet in January 1990 except MTBE,which is from SB11 at 10 feet on <br /> 8/31/98. There are no Soil After results since active cleanup was not conducted and no confirmation soil samples were <br /> collected. Water Before results are from MW2 on 6/10/97. Water After results are from MW1 on 3/1/06. The SFBRWQCB <br /> Environmental Screening Levels for soil are not exceeded so a risk assessment is not required. Compliance with the Public <br /> Participation requirements in Section 2728 of the California Code of Regulations has been met. <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 /> Have the Monitoring/Vapor wells been decommissioned? NO Number Decommissioned: 0 Number retained: 17 <br /> List enforcement actions taken: NORR/03-23-1992 <br /> List enforcement actions rescinded: n/a <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: RENS, Program Coordinator Unit IV <br /> Signature: Date: <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 /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />