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,"CORRECTED COPY" <br /> Case Closure'Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <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 <br /> (ppm} <br /> Before After Before After Before After Before After i <br /> TPH (Gas) 1800 <1.0 320 <0.05 Xylene 213 <0.005 28.0 <0.001 <br /> TPH (Diesel) 1100 <5.0 46.0 <0.05 Ethylbenzene 32 <0.005 4.7 <0.0005 <br /> Benzene 2.4 <0.005 1.9 <0.0005 Oil &Grease na na na na <br /> Toluene 11.0 <0.005 5.2 <0.0005 Heavy Metals 4.5 Pb na na na <br /> MTBE 14.1 1<0.005 13.5 0.086 <br /> _ <br /> Comments: A pre-UST removal assess was performed and approx. 3,000 cubic yds. of contaminated soil was excavated <br /> and 60,004 gals.of wa-t-er—umped-from=excava#,'w—=EdIST=excavation_backfilled with clean soil and 7 MWs installed. Soil <br /> before concentrations (cont.)are from UST removal samples T1-W and T3-E. Soil after cont: <br /> installed in UST area after excavation backfill from 15 ft. to surface. Water before conc.are from UST dewatering 318100 <br /> during excavation and after conc.are from downgradient MW3 on 9130103. Groundwater conc.from MW1 in source area are <br /> below detection limits for all constituents. EDB and 1,2-DCA were below 0.5 ppb in all MW on 09130103. <br /> i <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional.Board Basin [an. 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: na <br /> Should corrective action be reviewed if land use changes? no <br /> Monitoring/Vapor wells decommissioned: yes Number Decommissioned: 7 Number retained:0 <br /> List enforcement actions taken: level one, NOR sent to RP. <br /> List enforcement actions rescinded: na <br /> V. Local Agency Representative Data <br /> Name: Donna Heran, RENS Title: Director <br /> Environmental Health Department <br /> Signature: Date: <br /> / )VK,",, — 'O <br /> VI. Central Valley Regional Water Quality Control Board (RB)Notification <br /> Date Submitted to RB: Response Date: 03/04/2004 <br /> RB Staff: J. Barton Response: Concurrence <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> 7 on site MWs destroyed <br /> This document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official <br /> site file. <br />