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Page 2 <br /> -,base Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> r111. Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations-- Before and After Cleanup <br /> m Water .. (ppm) Contaminant Soil Before (ppm) Water (ppm} <br /> Contaminant Soil Before (Ppm) After Before . After <br /> After Before,; After <br /> TPH(Gas} 17,600 9600 270 0.10 Xylene - 2,757 890 26.1 0.0037 <br /> NA <br /> Eth !benzene 36$ 5.6 4.4 0.0026 <br /> TPH(Diesel) NA NA NA y NA <br /> Benzene 203 0.62 29 <0.0005 Oil&Grease' NA NA NA <br /> Toluene 1,420 3.8 44 X0.0005 Heavy Metals Pb<4.0 Pb6.7 NA NA <br /> MTBE 0.50 <0.002 1.9 0.016$ <br />' Comments: The Soil Before Concenttations: TPH-g and BTEX are from'UST over-excavation at 19' on 11105/1992; Pb is <br /> from UST removal at 12' on 0313111992; and MTBE is from soil boring SB-13D at 46.5' on 0512411999. Soil After Results are <br /> from CB-13 on 612612008: TPH-g, B, T, EB, Pb, and MTBE at 62.5' and.X at 37.5'. The Ground Water before <br /> L3Don <br /> entrations: TPH-g, T, and X are from MWA 3 on 0212412004; B from,.MW-13 on 05/2 <br /> 712003; E from MW-13 on _a <br /> - 1/201)2; andTMTBE'fr'orriMlN-1'3 on 0511`012001: 'The Ground Water After Concentrations: TPH-g, BTEX are from MW- <br /> 5/1812011; MTBE is from MW-15M on 5!1812011. Soil vapor extraction and air sparging ran from 2004 until 2011. <br /> irmation boring CB-13 was completed and soil samples were collected 612612008. <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/Remediation Wells Decommissioned? No Number Decommissioned: 0 Number retained: 38 <br /> i' List enforcement actions taken: NORs sent to RPs on 10/15/1992 and 412411996 <br /> List enforcement actions rescinded: None. <br /> V. Local Agengy AgencyRepresentative Data _ <br /> 4 Name: Adrienne Ellsaesser, REHS Title: 'Action Program Coordinator <br /> ure- <br /> SignatDat <br /> .. j <br /> f <br /> V1. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> Response: <br /> RB Staff: J. Barton � R- P <br /> Title: Eng, 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 /> i <br /> i <br /> 3 <br /> 1 <br />