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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> 111 Release and Site Characterization Information (continued) <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppb) Water (ppb) Contaminant Soil (ppb) Water (ppb) <br /> Before After Before After Before After Before After <br /> TPH (Gas) — ---- 1067.2 <100 Ethylbenzene ---- --- 13.8 <0.5 <br /> TPH (Diesel) ---- 1740 --- Xylene 38.8 <2 <br /> Benzene --- ---- 2.6 <0.5 Oil &Grease -- ---- — --- <br /> Toluene 43 ---- 1.6 <0.5 Heavy Metals ---- ---- ---- <br /> Mineral Spirits ---- ---- ---- ---- Lead ---- ---- ---- <br /> MTBE --- ---- <br /> Comments (Depth of Remediation, etc.): Groundwater samples taken from the excavation of the tanks indicated petroleum <br /> contamination, but very little in the soil. Subsequent investigation of the groundwater revealed the initial numbers were a s <br /> result of cross-contamination from improper sampling protocol. Beneficial uses of groundwater are protected, now and in <br /> the future. <br /> IV. Closure <br /> i <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? YES <br /> s <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? YES j <br /> i <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 wells decommissioned: NO Number Decommissioned: 0 Number retained: 1 <br /> List enforcement actions taken: NOR DATED 08/14/95 <br /> List enforcement actions rescinded: NONE <br /> l <br /> V. Local Agency Representative Data <br /> Name: MARGARET LAGORIO Title: SUPERVISING REHS SITE MITIGATION/LOP UNIT IV <br /> Signature: Date: a-1 q <br /> t <br /> Vl. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: PAT ANDERSON Response: Concurrence <br /> Title: HYDROGEOLOGiST <br /> 1 <br /> Vll. Additional Comments, Data, etc. E <br /> The RP is in the process of submitting a work plan for the destruction of the monitoring well. <br /> f <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the r <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br />