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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Ill. Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations-- Before and After Cleanup <br /> Contaminant Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After I I I After Before After <br /> TPH (Gas) 17,600 9600 270 0.10 Xylene 2,757 890 26.1 0.0037 <br /> TPH (Diesel) NA NA NA NA Ethylbenzene 368 5.6 4.4 0.0026 <br /> Benzene 203 0.62 29 <0.0005 Oil&Grease NA NA NA NA <br /> Toluene 1,420 3.8 44 <0.0005 Heavy Metals Pb<4.0 Pb<6.7 NA NA <br /> MTBE 0.50 <0.002 1.9 0.0168 <br /> 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 313111992; and MTBE is from soil boring SB13D at 46.5' on 5/24/1999. Soil After Results are <br /> from CB13 on 6/26/2608: TPH-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 MW13 on 2124/2004; B is from MW13 on 5/27/2003; E is from MW13 on 8/112002; <br /> and MTBE is from MW13 on 5110/2001. Soil vapor extraction and air sparging ran from 2004 until 2011. Confirmation <br /> boring CB13 was completed and samples were collected on 6/2612008. <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?Yes Number Decommissioned:40 Number retained:0 <br /> List enforcement actions taken: NORs sent to RPs on 10/15/1992 and 4/24/1996 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: cqt.y\--r._ Date: l- 2-- Zd 3 <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 7/9/2012 Response Date: 7/25/2012 <br /> RB Staff: J. Barton Response: No Further Action Required Concurrence <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 />