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t <br /> Case Closure Summary : Exhibit N, 1 of 2 <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 /> LU <br /> Contaminant Soil (ppb) Water (ppb) Contaminant Soil (ppb) Water (ppb) <br /> Before After BeforeAfter Before After Before After <br /> TRH (Gas) NO NO NO NO <br /> Benzene 14ppb NO 2_tppb NO <br /> Toluene NO NO 2.tppb NO <br /> Ethylbenzene 26ppb NO NO NO <br /> Xylene 25ppb NO 1.6ppb NO <br /> MTBE --- NO -- NO <br /> TBA — NO — 83 <br /> No remediation required. Soil and water before results were from sampling at the time of UST removal. Soil and <br /> groundwater after results were from preliminary assessment borings. <br /> :V. 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 Pian? 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: NA Number Decommissioned: NA Number retained: 0 <br /> List enforcement actions taken: NOR sent <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Do a Heran title: Director of Environmental Health <br /> i <br /> Signature, „� Date: I,— 4 <br /> VI. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RWQCB: 818199 Response Date: none <br /> RB Staff: Mark List Response: none <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> I <br /> I TBA contamination in water only. 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 />