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Case Closure Summary Page 2 <br /> 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) 18000 826 .191 <.50 Ethylbenene 310 15.7 .006 .0003 <br /> TPH (Diesel) Xylene .2000 73.9 .019 .003 <br /> Benzene <25 4.1 .003 .004 <br /> Toluene 250 4.9 .002 .002 MTBE 5.005 <.002 C005 <br /> Comments: All levels in ppm. Soil Before is from soil below UST at time of removal. Soil After levels are from MW1 at 30' <br /> below grade, at 40' below grade was NO. Groundwater Before is from MW1 on 8126197. Groundwater Atter is from MW1 on <br /> 1127198 sample B. ! <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 /> Monitoring/Vapor wells decommissioned: No Number Decommissioned: 0 Number retained: .1 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Margaret Lagorio Title: Supervising RENS <br /> Signature: Date: <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: . <br /> RB Staff. P. Anderson Response: <br /> Title: Hydrogeologist <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 /> . i <br />