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L .1 <br /> Page 2 <br /> Case Closure Summary <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 /> rBenzene <br /> Soil Before (ppm) Water (ppm) Contaminant Soil Before (ppm) Water (ppm) <br /> After Before After After Before After <br /> 6971 630 270.0 30.0 Xylene 1010 55.0 20.0 0.25 <br /> NA NA NA NA Ethylbenzene 152.0 9.9 2.8 0.085 <br /> 24.7 5.1 31.0 0.034 Pb 10 NA NA NA <br /> 442.0 24.0 32.0 0.0093 MTBE NA 0.051 0.25 <0.001' <br /> TAME NA NA 0.020 NA <br /> 1,2-DCA NA NA 0.012 NA <br /> From <br /> ents: The Soil Before Concentrations are from removal of UST#2 East at 11' bgs 04/02/1991. The Soil After <br /> ntrations for TPH-g are from B-9-20' bgs 11/29/2001, BTEX are from MW1 at 20' bgs 09/21/1995, and MTBE is from <br /> 25' bgs 04/16/1999. The Water Before Concentration for TPH-g and X are from B-9 at 25' bgs 11/29/2001, TE are <br /> W-1 09/30/1994, MTBE is from B-1 04/16/1999, TAME is from DPE-2 11/07/2008, and 1,2-DCA is from DP -2 <br /> 007. The Water After Concentration for TPH-g is from MW1 06/14/2010, BT are from DPE-2 06/14/2010, EX are <br /> PE-1 06/14/2010, and MTBE is from MW1 06/14/2010. <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: 15 Number retained: 0 <br /> List enforcement actions taken: NOR sent to RP <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Donna Heran, REHS Title: Director <br /> Name: <br /> Signature: Date: <br /> ( Z — /U – l2_ <br /> Vt. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 5/11/2012 Response Date: 6/13/2012 <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 />