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w. <br /> Case Closure Sumary Page 2m <br /> Leaki nderground Fuel Storage Tank Dram <br /> EIh Release and Site Charas; tion Information (coutinuedy <br /> Maximum Documented Contaminant Concentrations--Before4and After Cleanup' <br /> i i I <br /> Contaminant soil (Ppm) Water (ppm) Contaminant: Soil • (ppm) Water;, (Ppm) <br /> Before After Before After Before After i Before After <br /> TPH ([Sas} 5,100 >1 1.0 >.05 Xylene 3 F ; 210 >.003 . .130 ` x.0003 <br /> TPH (Diesel) Ethylbenzeue NA >.003 .026 >.0003 <br /> Benzene ND >2 >.003 .008 >.0003 Oil & Grease >4il. ia <br /> Toluene 17 >.003 .068 >.0003 Heavy :aetals 18 Pb <br /> Other <br /> Other (EDB)' ; ND .2. .00069 >.00002 <br /> Comments (Depth of Remediation, etc.): � 4 E y <br /> aerated <br /> 1990 over-excavation to 10' followed by further,jexca74ation to 151 . The soil was <br /> i <br /> and used for backfill. Residual soil contaminationlC <br /> 'was evidenced. Subsequently a vapor <br /> . <br /> extraction system was installed in April 1992 and operated until January 1993. <br /> i <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional' Board <br /> Basin Plan? (Yes) No j <br /> F 'F <br /> Does completed corrective action protect potential beneficial uses per ',the Regional Board <br /> Basin Plan? (Yes) No <br /> 4 <br /> Does corrective action protect public health forcurrent land use? (Yes) No ; <br /> + <br /> Site management requirements: <br /> t <br /> Monitoring and Vapor Extraction wells should be 'destroyed. <br /> Should corrective action be reviewed if land use} changes? Yes (Na) <br /> Monitoring wells Decommisioned: Yes (No) Number DeCommisioned: Number Retained: 4 <br /> IF .: <br /> List enforcement actions taken: NOR sent 08-15-90 and:101-14-91 <br /> List enforcement actions rescinded: none <br /> V. Local Agency Representative Data J <br /> rSamB. <br /> Donna Heran Title: Director of Environmental Health, REHS <br /> ignature: Date: —30--q <br /> VI. RWQCB Notification <br /> Date Submitted to RB:9-27-93 RB Response:'` none <br /> RWQCB Staff Name: E. Thayer Title: Assoc. Engineer Date: M <br /> VII. Additional Comments, Data, etc. <br /> k • i <br /> 13 '.j I ii <br /> This document and the related CASE CLOSURES LETTER, Shall be retained by the 'lead agency <br /> as part of the official site file. (08/24/93) <br /> Exhibit N Page 2 of 2 <br />