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All <br /> 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 (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 ---- ---- ---_ ---- bead --- --- ---- ---- <br /> MTBE <br /> . i <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 <br /> E . result of cross-contamination from improper sampling protocol. Beneficial uses of groundwater are protected, now and in <br /> f <br /> the future. <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 wells decommissioned: YES Number Decommissioned: 1 Number retained: 0 <br /> List enforcement actions taken: NOR DATED 08/14/95 <br /> f List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DO HERAN Title: DIRECTOR OF ENVIRONMENTAL HEALTH <br /> Signature: Date: — 1-9 9 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 04/03/98 Response Date: 05/12/98 <br /> RB Staff: PAT ANDERSON Response: Concurrence <br /> Title: HYDROGEOLOGIST <br /> VII. Additional Comments-Data, etc. <br /> This document and the related (4,.jE CLOSURE LETTER, Shall be retainer the lead agency as part of the <br /> n.r ,+official site file. (08124/93) Exhibit N Page 2 of 2 r.< <br />