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Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> Marci Property <br /> 2969 Loomis Road, Stockton, CA <br /> III. Release and Site Characterization Information continued <br /> Maximum Docum;nted 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) 800 NA 222 0.002 Xylenes 6.4 NA 0.027 <0.001 <br /> TPH(Diesel) 64,500 NA 99 8.6 MTBE NA NA 0.0055 NA <br /> Benzene 0.27 NA 0.007 0.0022 1,2-DCA NA NA <0.0005 NA <br /> Toluene 0.033 NA 0.014 <0.0005 Lead 7.6 NA NA NA <br /> Eth (benzene 12.34 1 NA 10.007 0.0007 1 Naphthalene NA NA NA 0.11 <br /> Comments: The 'Soil Before' concentrations for TPH (gas), TPH (diesel) and ethylbenzene are from soil boring sample <br /> LB-1-14 @ 56 feet on 05/30/96, benzene from CPT-11 @ 50 feet on 11/03/05, toluene from MWA @ 48.5 feet on <br /> 04/3-7/92, xylene f,om MW-7 @ 45 feet on 05/09/02, and lead from MW-5 @ 70 feet on 08/21/00. MTBE, 1,2-DCA and <br /> naphthalene were iot analyzed. `Soil After' concentrations were not collected. The 'Groundwater Before' concentrations <br /> for TPH (gas) are from MWA on 11/27/96, TPH (diesel) and 1,2-DCA from MW-5 on 08/19/04, benzene from MW-6 on <br /> 06/27/01, toluene from CPT-9 on 11/02/05, ethylbenzene from MW-5 on 12/09/05, xylenes from MWA on 06/18/93, and <br /> MTBE from MW-7 on 03/19/03. 'Groundwater After' concentrations for TPH (gas) are from MW-7 on 12/28/08; <br /> TPH diesel , benzene, toluene, ethylbenzene, xylenes and naphthalene are from MW-7 on 06/14/11. NA—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/Vapor wells decommissioned: Yes Number Decommissioned: 23 Number retained: 0 <br /> List enforcement actions taken: NOR on 08/10/89 and 08/06/91 <br /> List enforcement actions rescinded: None <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, REHS Title: Director <br /> /­1 F --d--- <br /> Signature: `` Date: September 4, 2013 <br /> VI Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted tc RB: February 1, 2013 Response Date: February 26, 2013 <br /> RB Staff: James L.L. Barton Response: Concurrence <br /> Title: Associate E,igineering Geologist <br /> VII. Additional Coriments, 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 /> Parer.9 <br />