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Case Closure Summari <br /> Leaking Underground Fuel Storage Tank Program <br /> Former Steve and Gene's Service <br /> 2315 North EI Dorado Street, Stockton, California <br /> III. Release and Site Characterization Information continued <br /> Maximum Documented Contaminant Concentrations --Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH (Gas) 13,000 NA 720 26 Xylenes 250 NA 19.5 5.4 <br /> TPH(Diesel) <1 NA NA NA MTBE <0.17 NA 1.1 <0.0005 <br /> TPH(Motor Oil) 4,200 NA NA NA 1,2-DCA 0.0067 NA 0.268 0.0173 <br /> Benzene 76 NA 30.9 2.1 EDB <0.010 NA 0.011 <0.0005 <br /> Toluene 260 NA 44.9 3.6 Lead <4 NA NA <0.050 <br /> Ethylbenzene 1120 1 NA 18.25 10.53 1 Naphthalene NA I NA I NA 10.012 <br /> Comments: The `Soil Before' concentrations for TPH (gas) and ethylbenzene are from sample B @ 31 feet on 06/23/1996, <br /> benzene from sample B @ 46 feet on 06/23/1996, toluene and xylenes from MW-3 @ 29.5-30 feet on 06/01/1995, MTBE <br /> from sample B @ 41 feet on 06/23/1996, TPH (diesel) and lead from SBA @ 10 feet on 10/27/1993, TPH (motor oil)from <br /> waste oil tank sample 1 (A and B) @ 8.5 feet on 06/15/1987, and 1,2-DCA and EDB from waste oil tank sample 3 (A and B) <br /> @—8 feet on 04/2111987. `Soil After' concentrations were not collected. The `Groundwater Before' concentrations for <br /> TPH (gas) are from MW-2 on 09/12/2001, benzene and toluene from EW-1 on 07/28/2004, ethylbenzene from MW-3 on <br /> 08/06/2004, xylenes from EW-1 on 07/27/2004, MTBE from MW-5 on 08/29/2000, 1,2-DCA from MW-2 on 08/26/2005, and <br /> EDB from MW-3 on 07/07/2006. `Groundwater After' concentrations for TPN (gas), benzene, toluene, and total xylenes <br /> are from MW-3 on 09128/2012, ethylbenzene from MW-2 on 03/03/2012, MTBE and EDB from MW-3 on 01/26/2010, 1,2- <br /> DCA from MW-108 on 02101/2011, and lead and naphthalene from MWA on 01/2112014. NA—not anal zed <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/Vapor wells decommissioned: Yes Number Decommissioned: 24 Number retained: 0 <br /> List enforcement actions taken: NOR 10/14/1993, NOR 07/21/1999 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Linda Turkatte, REHS Title: Director <br /> Signature: �_�'� � Date: 01/02/2015 <br /> VI Central Valley Regional Water Quality Control Board (RB) Notification <br /> Date Submitted to RB: 7/16/2014 Response Date: 7/24/2014 <br /> RB Staff: Cori Condon Response: Concurrence <br /> Title: Senior Engineering Geologist, CHg <br /> VII. Additional Comments, Data, etc. <br /> Remediation by dual-phase extraction (soil vapor and groundwater)took place between June 2007 and June 2009 and a <br /> pilot study was performed involving soil vapor extraction between August 9, 2011 and February 2, 2012 and air sparging <br /> between August 9, 2011 and September 30, 2012. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br /> Page 2 <br />