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s <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> 111. 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) 2100 NA 1600 10 Xylene 190 NA 150 1.2 <br /> TPH (Diesel) 17 NA NA NA Ethylbenzene 31 NA 29 0.31 <br /> Benzene 12 NA 19 1.2 TPH(Motor Oil) 740 NA NA NA <br /> Toluene 88 NA 50 1.6 Heavy Metals Pb=13 NA Pb=1.2 SIA <br /> MTBE 0.01 NA X0.5 X0.05 <br /> Comments: The Soil Before Concentrations: TPH-g, E, T, X are from boring sample B3-2 at 16' collected 81711998; B is <br /> from boring B3-17 at 20' collected 4/20/2007;TPH-d is from UST removal sample 2-S at approx. 12' collected 2/16/1988; <br /> TPH-motor oil is from UST removal sample 1-N at 12' collected 2116/1988; Lead (Pb) is from sample boring B3-17 at 10' <br /> collected 412012007;. and MTBE is from boring sample MW3-3 at 25' collected 5/18/1998. No Soil After data collected. The <br /> Ground Water Before Concentrations: TPH-g, E, X are from a grab sample B3-1 at 22' collected 8113/1998- B is from a grab <br /> sample B3-5 at 20' collected 12/20/2001- T is from B3-15-20 at B3-15 at 20' collected 412012007; Lead (Pb) is from a grab <br /> sample B3 28-45 collected at 45' on 312312010; and MTBE is from a grab sample B3-15-20 collected at 20' 4/2012007. <br /> Ground Water After Concentrations: TPH-g, T, and X are from MW3-3 collected on 10/12/2011-1 and B, E, and MTBE are <br /> from MW3-8 collected on 10/12/2011. NA above = not analyzed. <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: 13 Number retained: 0 <br /> List enforcement actions taken: NOR sent to RP on January 26, 1998 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: 1 ` Date: <br /> Vi. Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 7/10/2012 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 />