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P <br /> Case Closure Summary <br /> Leaking Underground Fuel Storage Tank Program <br /> 1112 E. Harding Way, Stockton CA <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) 10,000 NA 3.7 0.35 Xylenes 1,700 NA 0.47 0.014 <br /> TPH (Diesel) 1,700 NA 5.4 <0.05 Ethylbenzene 320 NA 0.18 0.024 <br /> TPH(Motor Oil) NA NA NA <0.25 Lead 20 NA NA NA <br /> Benzene <25 NA 0.017 <br /> <0.001 MTBE <10 NA 0.17 0.037 <br /> Toluene 390 NA 0.0087 <0.001 1,2 DCA NA NA 0.13 0.093 <br /> Comments: SOIL BEFORE: TPHg, benzene, toluene, ethylbenzene, xylenes taken from ET- S67 at 10.5 feet bsg on <br /> 4/11/2000. Lead from east stockpile on 4/15/87. MTBE and TPHd taken from ET-SB4 at 15 feet bsg on 7/24/97, TPHmo <br /> and 1, 2 DCA not analyzed. SOIL AFTER: No soil after samples taken. WATER BEFORE: TPHg and xylenes taken from <br /> MW5 on 1/8/0-1. TPHd taken from MW2 on 7/9/07. Benzene taken from MW2 on 4/22/02. Toluene taken from MW5 on <br /> 7/26/06. Ethylbenzene taken from MW5 on 7/9/07. MTBE taken from MW3 on 4/22/02. 1, 2 DCA from MW7 on 4/6/10. <br /> TPHmo and lead not analyzed. WATER AFTER: TPHg, TPHd and TPHmo taken from MW2 on 11/15/11. Benzene, toluene <br /> and 1, 2 DCA taken from MW7 on 11/15/11. Xylene and ethylbenzene taken from MW5 on 11/15/11. MTBE taken from <br /> MW4 on 11/15/11. Lead not analyzed. 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: 0 Number retained: 0 <br /> List enforcement actions taken: NOR: 6/18/1996 <br /> List enforcement actions rescinded: NONE <br /> V. Local Agency Representative Data <br /> Name: DONNA RERAN, REHS Title: DIRECTOR <br /> Signature. Date: 4/17/2014 <br /> VI. Central Valley Regional Water Quality Control Board RB Notification <br /> Date Submitted to RB: 5/22/13 Response Date: 6/5/2013 <br /> RB Staff: JAMES L.L. BARTON, PG Response: CONCURRANCE <br /> Title: ENGINEERING GEOLOGIST <br /> VII. Additional Comments, Data, etc. <br /> F_ <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 />