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' 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 6ontaminant Soil Soil Water Water <br /> Before After Before After I Before After Before After <br /> TPH-gas <50 <020 NA NA lthylbenzene NA <.005 <.002 <.0005 <br /> TPH-diesel 23,000 18,000 <.05 <.05 Xylene <1 0.69 <.002 <.001 <br /> Benzene <1 <0.005 <.001 <.0005 I' TBE NA NA <.0005 <.0005 <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 5111188. Soil After results for <br /> TPH-d are from DMW-6.1 at 25 feet bsg on 12115198, results for TPM-g and BTEX are from SB-20 at 21 feet taken on <br /> 513195. 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 6/2109. Over-excavation of contaminated sail 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 uses per Regional Board Basin Plan?Yes <br /> Does corrective action protect public health for current land us4? Yes <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes? Yes <br /> Monitoring wells decommissioned: Yes Number Decom issioned: 14 Number retained: 0 <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. LOCAL AGENCY REPRESENTATIVE DATA <br /> E <br /> Don a Heran, REHS Title: Director, Environmental Health Departmenture: _ Date: e)._ v <br /> IV. 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 Resp nse: Concurrence <br /> Title: Associate Engineer Geologist <br /> I <br /> VII. ADDITIONAL COMMENTS, DATA, ETC. <br /> i <br /> Previous closure letters were provided for Tanks 1, 3, 4, 6, 7, 8, 9. <br /> This document and the related CASE CLOSURE LETTER shall be retained by the lead agency as part of the official site file. <br />