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i I <br /> Case Closure Summary Page 2 <br /> Leaking Underground Fuel Storage Tank Program <br /> 111 Release and Site Characterization Information (continued) <br /> t <br /> ximum Documented Contaminant Concentrations--Before and After Cleanup <br /> Contaminant Soil (ppm) Water (ppm) Contaminant Soil (ppm) Water (ppm) <br /> Before After Before After Before After Before After <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 Ethyibenzene 32 <0.005 4.7 <br /> na <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 nal na na <br /> MTBE 4.1 <0. 05 13.5 10.086 <br /> Comments:A pre-UST removal assess was performed and approx. 3,000 cubic yds. of contaminated soil was excavated <br /> and 60,000.gals. of water pumped from excavation. UST excavation backfilled with clean soil and 7 MWs installed. Soil <br /> before concentrations (cone.) are from UST removal samples Tl-,W and T3-E. Soil after cone.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 318!00 <br /> during excavation and after conc.are from downgradient MW3 on 9130103. Groundwater conc.from MW 1 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 /> IV. Closure <br /> Does completed corrective action protect existing beneficial uses per the Regional Board Basin Pian? 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: 0 Number Decommissioned: 0 Number retained:7 <br /> List enforcement actions taken: level one, NOR sent to RP. <br /> List enforcement actions rescinded: na i <br /> V. Local Agency Representative Data <br /> Name: Nuel Henderson, Jr., RG Title: Engineering Geologist' <br /> Site Mitigation/LOP Unit . <br /> it�IV <br /> Signature: /� Date: o.-22ii-:ori-erl pry <br /> 1111 <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 and the related CASE CLOSURE LETTER,Shall be retained by the lead agency as part of the official <br /> site file. <br />