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Case Closure Summary : Exhibit N Pa` I of 2 <br /> Case Closure Summary Page 2' <br /> Leaking Underground Fuel Storage Tank Program <br /> In Release and Site Characterization Information, continued) <br /> Maximum Documented Contaminant Concentrations -Before and After Cleanup (tank removal) <br /> Contaminant Soil Soil Water (ppb) Contaminant�� Soil Soil Water (ppb) <br /> r Before- After Before After �! Before-- After— Before After <br /> 9.5'bsg 5'bsg 9.5'bsg 5'bsg <br /> (Ppm) (ppm) is (ppm) (ppm) <br /> TPH (Gas) <1.0 830 <50 MTBE !i <5_0 <br /> TPH (Diesel) <10 Mineral Spirits <br /> Benzene <0.005 <0.1 — <0.5 Oil&Grease ,� --- --- -- —' f <br /> Toluene <0.005 0.58 <0.5 Heavy Metals ---- --- — -- <br /> Ethylbenzene <0.005 7.1 ---- <0.5 Lead ! --- ---- ---- p. <br /> Xylene 0.52 58 ---- <0.5 I <br /> Comments (Depth of Remediation, etc.): UST was removed in 1992. No sign of odor or discoloration at the bottom of the <br /> excavation at 9.5 feet below surface grade (bsg). Stockpile exhibited odor and discoloration and was replaced back in the <br /> excavation. Subsequent investigation indicated minimal petroleum hydrocarbon contamination limited to 5 feet bsg and <br /> F above. Groundwater is protected. Remediation not required. } <br /> I �1 <br /> IV. Closure Id <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? Yes <br /> f <br /> Does completed corrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes 8 <br /> { Does corrective action protect public health for current land use? Yes 1= <br /> Site management requirements: none <br /> E <br /> Should corrective action be reviewed if land use changes?Yes <br /> 1 Monitoring wells decommissioned: no Number Decommissioned:1 Number retained: 1 I <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data r <br /> ' Name: Donna HeranZ e t �- Title: Director of Environmental Health see S61 <br /> { Signature: Date: k <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification i? <br /> Date Submitted to RB: Response Date: <br /> RB Staff: Mark List Response: ° <br /> Title: Engineering Geologist <br /> 4 <br /> # VII. Additional Comments, Data, etc. <br /> Monitoring well will be properly destroyed under permit before final closure.�f <br /> i� <br /> r <br /> k <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the j <br /> official site file. (08124193) Exhibit N Page 2 of 2 <br />