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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 /> [Benzene <br /> ontaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water <br /> Before After Before Alter Before After Before After(PPM) <br /> PH(Gas) 1800 <1.0 324 <0.05 Xylene 213 <0.005 28.0 <0.001 <br /> PH(Diesel) 1100 <5.0 46.0 <0.05 Ethylbenzene 32 <0.005 4.7 <0.0005 <br /> 2.4 <0.005 1.9 <0.0005 Oil &Grease na na naoluene 11.0 <0.005 5.2 <0.0005 Heavy Metals 4.5 Pb na na na <br /> na <br /> MTBE 4.1 <O.00S 3.5 0.086 <br /> Comments: A pre-UST removal assess was performed and approx. 3,000 cubic yds. of contaminated soil was excavated <br /> and 80,000 gals. of water pumped from excavation. UST excavation backfilled with clean soil and 7 MWs installed. Soil <br /> !_ fo.re,concentrations (cone.)arejf om UST removal.sampies rT4.A4V-andZ 3-E.-Soil-after cont. from-MW-1(20-ft-bgs) <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 9/30103. Groundwater conc.from MW 1 in source area are <br /> below detection limits for all constituents. EDB and 1,2-DCA were below 0.8 ppb in all MW on 09130103. <br /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Plan? 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 /> I <br /> Site management requirements: na <br /> Should corrective action be reviewed if land use changes? no <br /> Monitoring/Vapor wells decommissioned: 0 Number Decommissioned: 0 Number re'tained:7 <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 List enforcement actions rescinded: na 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: Nuel Henderson, Jr., RG Title: Engineering Geologist <br /> 01 Site Mitigation/LOP Unit IV <br /> Signature: Date: o.-2 <br /> VI. Central Valley Regional Water Quality Control Board (RB)Notification <br /> Date Submitted to RB: Response Date: <br /> RB Staff: J. Barton Response: <br /> Title: Engineering Geologist <br /> VII. Additional Comments, Data, etc. <br /> This document document and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official <br /> site file. <br />