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Case Closure Summary : Exhibit F 'age 1 of 2 U <br /> Case Closure Summary Page 2 <br /> I 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 (pprn) Water (ppm) Contaminant rNS <br /> (ppm) Water (ppm) <br /> Before After Before After After Before After <br /> f TPH (Gas) 1200 340 3.70 2.45 Ethylbenzene 8.9 .041 .041 <br /> TPH (Diesel) ND NS NS NS Xylene 44 .15 .247 <br /> Benzene 11 5.8 .20 .37 Oil&Grease NS NS NS <br /> Toluene 63 1 13 .04 .02 Heavy Metals NS NS NS <br /> Mineral Spirits NSNS NS NS Lead 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 /> IV. Closure 1 <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? (Yes) J <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: (No) Number Decommissioned: Number retained: 5 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> i <br /> Name: Donna Heran i Title: Director of Environmental Health <br /> Signature: S Date: (D//6/1 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> i <br /> Date Submitted to RB: Response Date: <br /> RB Staff. P. Anderson Response: <br /> Title: Assoc Eng Geologist <br /> VII. Additional Comments, Data, etc. <br /> Low risk groundwater <br /> i <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the <br /> official site file. (08124/93) Exhibit N Page 2 of 2 <br />