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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 (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> j Before After Before After Before After Before After <br /> TPH (Gas) 836 5500 20.0 2.1 Xylene 46.5 <4.0 0.22 O.D1 <br /> TPH(Diesel) 4100 690 unk unk Ethylbenzene unk <2.0 0.49 D.048 <br /> Benzene 0.46 5.8 2.8 0.15 Oil&Grease 7100 3600 3A 2.1 <br /> Toluene 7.43 <2.0 0.048 0.0051 MTBE unk <2.0 <.ODS 0.0046 <br /> Comments: Soil before concentrations are from samples collected beneath UST-B and Bunker-C. Soil after concentrations <br /> are from confirmation samples taken after soil excavation (remediation)activities in 2011. The ground water before and <br /> after concentrations are from MW-B which was located down-gradient of the source areas. MW-B was removed during soil <br /> excavation and replaced with MW-BR. MW-BR was approximately 20 feet down gradient of former MW-B. Ground water <br /> results from MW-BR were non-detect for all constituents (including TPH-diesel)for two consecutive sampling events since <br /> remediation. MW-BR was destroyed by over-boring on 7/20/2011. <br /> IV. Closure <br /> [Doesorrective action protect existing beneficial uses per the Regional Board Basin Plan?Yes <br /> orrective action protect potential beneficial uses per the Regional Board Basin Plan? Yes <br /> ction protect public health for current land use?Yes <br /> requirements: none <br /> Should corrective action be reviewed if land use changes?Yes <br /> Monitoring/Vapor wells decommissioned?: Yes Number Decommissioned: 3 Number retained: 0 <br /> List enforcement actions taken: NOR sent to RP. <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data <br /> Name: : Donna Heran, REHS Title: Director <br /> Signature: t c Date: <br /> Vl. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: July 5, 2011 Response Date: July 14, 2011 <br /> RB Staff: J. Barton Response: No Further Action Required Concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> This document and the related CASE CLOSURE LETTER, Shall be retained by the lead agency as part of the official site file. <br />