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Case Closure Summary Page 2 <br /> Lead Underground Fuel Storage Tank Prom <br /> 111. 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 Water <br /> Before After Before After Before After Before After <br /> TPH-gas 13,000 440 27 .480 Ethylbenzene 230 7.2 4.4 <.0005 <br /> TPH-diesel <10 NA 7.8 <.05 Xylene 1,200 4.2 27 .006 <br /> Benzene 140 2.6 19 .0055 MTBE 1 390 <0.005 1 5.9 .012 <br /> Toluene 814 9.2 43 <.0005 1,2 DCA NA <0.005 NA <0.0005 <br /> Comments: Soil before results are from soil sample PLE-23a on 2120/91 beneath unleaded fuel line beneath northern <br /> pump island, except for MTBE that is from MW 12-40 on 619100 and TPH-diesel that is from UST removal in June 1994. <br /> Soil after results are from B-23-40 on 10118107. Water before results are from VW-1 on 9110196 except for MTBE that is <br /> from VW-1 on 10130197. Water after results are from VW-1 on 2116109, except MTBE which is from MW-5. Site remediation <br /> includes GWE 10101 to 4106 and SVE 1105 to 8107. <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 use? Yes <br /> Site management requirements: None <br /> Should corrective action be reviewed if land use changes? Yes <br /> Monitoring wells decommissioned: Yes Number Decommissioned: 26 Number retained: None <br /> List enforcement actions taken: NOR <br /> List enforcement actions rescinded: <br /> V. LOCAL AGENCY REPRESENTATIVE DATA <br /> [NamL <br /> Do a Heran, RENS Title: Director <br /> ignature: Date: p —..9- p <br /> IV. CENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD RB NOTIFICATION <br /> Date Submitted to RB: 7113109 Response Date: 7131109 <br /> RB Staff: James L. Barton Response: Concurrence <br /> Title: Associate Engineer Geologist <br /> VII. ADDITIONAL COMMENTS, DATA, ETC. <br /> This document and the related CASE CLOSURE LETTER, shall be retained by the lead agency as part of the <br /> official site file. <br />