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Case Closure Summary : Exhibit� --D age 1 of 2 C 1 <br /> Case Closure Summary Page 2 •1 <br /> Leaking Underground Fuel Storage Tank Program <br /> k <br /> III Release and Site Characterization Information (continued) <br /> rMaximum Documented Contaminant Concentrations --Before and After Cleanup <br /> aminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm)Before After Before After Before After Before After <br /> (Gas) 1200 340 3.70 2.45 Ethylbenzene 17 8.9 .041 .041 <br /> (Diesel) ND NS NS NS Xylene 170 44 .15 •247 <br /> zene 11 5.8 .20 .37 Oil &Grease NS NS NS NS <br /> Toluene 63 13 .04 .02 Heavy Metals NS NS NS NS <br /> Mineral Spirits NS NS NS NS Lead ND NS NS NS <br /> MTBE NS - NS NS ND <br /> Comments (Depth of Remediation, etc.): UST location was overexcavated to edge of levee. Groundwater contamination <br /> present in MW-6 only. No domestic wells nearby. Gradient is away from slough. Low risk groundwater site <br /> i <br /> I <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: 5 Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donn Heran Title: Director of Environmental Health <br /> Signature: Date: 12-–3 j-9 2 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 10/16/97 Response Date: 11/4/97 <br /> RB Staff: P. Anderson Response: Concurrence <br /> Title: Assoc Eng Geologist <br /> VII. Additional Comments, Data, etc. <br /> Low risk groundwater <br /> i <br /> I This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> 1 <br /> official site file. (08/24/93) Exhibit N Page 2 of 2 <br />