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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 Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> TPH (Gas) 1500 NA 130.0 <0.05 Xylene 85 NA 3.3 <0.001 <br /> TPH (Diesel) 5.6 NA NA NA Ethylbenzene 17 NA 1.70 <0.001 <br /> Benzene 0.27 NA 0.77 <0.001 Oil&Grease <50 NA NA NA <br /> Toluene 20 NA 0.034 <0.001 Heavy Metals Pb<9.5 NA NA NA <br /> MTBE 50 NA 160 0.011 <br /> Comments: The Soil Before Concentrations: TPH-g, E, and T are from sample N-1 at 16 feet collected on 12/30/1998; B is <br /> from ST-20 collected 01/15/1999; X from TL-1 at 10.5 feet collected 12/31/1998; TOG from FL-2-3 at 3 feet collected <br /> 05/14/1997; Pb from ST-16 (stockpile)collected 01/15/1999; and MTBE is from TX-5 at 11.5 feet collected 12/31/1998. No <br /> Soil After Concentrations are available. The Ground Water Before Concentrations: TPH-g and MTBE are from MW-5 <br /> collected on 12/23/1998; BTEX are from MW-3 collected on 09/15/1993. The Ground Water After Concentrations: TPH-g, <br /> BTEX and MTBE are from MW-10 collected on 04/12/2011. <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: 55 Number retained: 0 <br /> List enforcement actions taken: NOR sent to RPs <br /> List enforcement actions rescinded: None <br /> V. Local Age ncRepresentative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: ) � Date: 10/8/2014 <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 6/8/2012 Response Date: 6/27/2012 <br /> RB Staff: J. Barton Response: Concurrence <br /> Title: En.9. 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 />