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Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> Former Western Lift—Case 1 -3430 South EI Dorado Street, Stockton, California 95206 <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) 2,800 ND 0.26 ND Xylene 74 ND 0.041 ND <br /> TPH (Diesel) 1900 ND 0.31 ND Ethylbenzene 12 ND 0.009 ND <br /> Benzene 0.25 ND 0.015 ND Oil&Grease NA NA NA NA <br /> Toluene 0.44 ND 0.012 ND Lead 0.08 NA NA NA <br /> MTBE NA NA 0.0038 0.0012 <br /> 1,2 DCA I NA I NA I NA 10.001 <br /> Comments: Soil Before Concentrations: TPH (Gas), TPH (Diesel), benzene, ethylbenzene, and xylene are from soil <br /> stockpile sample W-30(Spoil) on 4/17/1992; toluene is from stockpile sample W-17(Spoil) on 4/17/1992; and lead is from <br /> WL-3-29(PitSpl) at 29' on 9/24/1991.Soil After Concentrations: All samples from WL-B-34 from over-excavation tank <br /> bottom at 34' on 11/1/1991 were ND. Water Before Concentrations: TPH (Gas) and TPH (Diesel) are from MW-1 on <br /> 6/4/1992; benzene is from MWA on 11/24/1992; toluene, ethylbenzene, and xylene are from MWA on 9/3/1996; and MTBE <br /> is from MWA on 3/31/2003. Water After Concentrations: All results are from MWA on 3/16/2009. <br /> NA= not analyzed and ND=non-detectable. <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: 5 Number retained: 0 <br /> List enforcement actions taken: NORs sent to RPs on 8/28/1991 and 1/8/2007. <br /> List enforcement actions rescinded: NA <br /> V. Local Agency Representative.Data <br /> Name: Donna Heran, REHS Title: Director <br /> Signature: �, Date: May 5, 2014 <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: July 2, 2013 Response Date: July 24, 2013 <br /> RB Staff: James L. L. Barton Response: Concurrence <br /> Title: Engineering. Geologist <br /> VII.Additional Comments, Data, etc. <br /> Case#1 is located in the southern area of the site. Area was over-excavated to approximately 32 feet. In GeoTracker, <br /> Case#1 and Case#2 information for this site maybe comin led. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />