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I <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Ill. Release and Site Characterization Inforrriatian continued <br /> Maximum Documented Contaminant Concentrations--Before and After Cleanup <br /> I' Contaminant Soil Before (ppm} Water (ppm) Contaminant Soil Before {ppm) Water (ppm} <br /> After. Before= After After Before After <br /> :Benzene <br /> H (Gas) 17,600 9600 270 0.10 Xylene 2,757 890 26.1 0.0037 <br />{. H{Diesel) NA NA NA NA Ethylbenzene. 368 5.6 4.4 0.0026 <br /> 203 0.62 .29 <0.0005 Oil&Grease NA NANA NA <br /> uene 1,420 3.8 44 <0.0005 Heavy Metals Pb<4.0 Pb6.7 NA NA <br /> MTBE 0.50 <0.002 11.9 0.0168 <br /> I Comments: The Soil Before Concentrations: TPH-g and BTEX are from UST over-excavation at 19' on 1110511992; Pb is <br /> from UST removal at 12' on 03/31/1992; and MTBE is from sail boring SB-13D at 46.5' on 0512411999. Soil After ResU Its are <br /> from CB-13 on 6/26/2008: TPN-g, B, T, EB, Pb, and MTBE at 62.5' and X at 37.5'. The Ground Water before <br /> concentrations: TPH-g, T, and X are from MW-13 on 0212412004; B from MW-13 on 05/27/2003;,E from MWA3 on <br /> 0810112002; and MTBE from MWA 3 on 05/10/2001., The Ground Water After Concentrations: TPH-g, BTEX are from MW- <br /> 3D airs ar in ran from 2004 until 2011. <br /> Soil vapor extraction 9 g . <br /> - 'on 5I1812011. S P <br /> 3D on 51181201.1; MTBE is from MW 15M p <br /> Confirmation boring CB-13 was completed and soil samples were collected 612612008. <br /> IV. Closure <br /> E 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 . <br /> List enforcement actions taken: NORs sent to RPs'on 10/16/1992 and 4/24/1996 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> ' Name: Adrienne Ellsaesser, REHS Title: Action Program Coordinator <br /> Signature 1' Dat <br /> VI. Central ValleyRe ional Water Quality Control Board RB Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: <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 /> 1 _ <br />