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I <br /> N <br /> Case Closure Summary Page 2 of 2 <br /> Ill. RELEASE AND SITE CHARACTERIZATION INFORMATION (Continued) <br /> Maximum documented Contaminated Concentrations—Before and After Cleanup ppm <br /> Contaminant Soil Soil Water Water Contaminant Soil Soil Water Before After Before Water <br /> Before After Before After <br /> After <br /> <50 <0,20 NA NA Ethylbenzene NA <.005 <.002 <.0005 <br /> TPH-gas <.05 <.05 Xylene <1 0.69 <.002 <.001 <br /> TPH-diesel 23,000 18,000 NA NA <.0005 <.0005 <br /> Benzene <1 <0.005 <.001 <.0005 MTBE <br /> Toluene <1 0.081 <.001 <.0005 <br /> 1,2-DCA NA NA 038 .0088 <br /> Comments: Soil Before results for TPH-d are from soil sample EES�6 at 22 feet bsg taken on 6120190 during over- <br /> excavation of the tank#5 area, results for TPH-g and BTX are from beneath Tank 5 on 5/11188. Soil After results for <br /> TPN-d are from DMW-6.1 at 25 feet bsg on 12/15198, results for TPiH-g and BTEX are from SB-20 at 21 feet taken on <br /> 513/95. Water Before results are from DMW-6 on 12/12/01 when the highest concentration of 1,2 DCA was reported. <br /> Water After results are from DMW-6 on 612109. Over-excavation of contaminated soil occurred at both tank areas in June <br /> 1990. <br /> IV. CLOSURE <br /> Does completed corrective action protect existing beneficial uses per Regional Board Basin Plan?Yes <br /> Does completed corrective action protect potential beneficial 1 ses per Regional Board Basin Plan? Yes <br /> Does corrective action protect public health for current land use? Yes <br /> FShould <br /> agement requirements: None <br /> orrective action be reviewed if land use changes? Yesng wells decommissioned: Yes Number Decommissioned: 14 Number retained: fl <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. LOCAL AGENCY REPRESENTATIVE DATA <br />� <br /> itle: Director, Environmental Health Department <br /> NaName: Dona Heron, REHS <br /> Signature: D may, _ . . -_ ,�p1�v <br /> e— — 40 <br /> IV. <br /> CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD RB NOTIFICATION <br /> Date Submitted to RB: 09/24/09 Response Date: 10/05/09 <br /> RB Staff: James L. Barton Response: Concurrence <br />+ Title: Associate Engineer Geologist <br /> VII. ADDITIONAL COMMENTS, DATA, ETC. t <br /> letters were provided for Tanks 1, 3, 4, 6, 7, 8, 9. <br /> I Previous closure I p <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />