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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 /> Contaminant Soil (ppm) Water (ppm) Contaminant So11 (ppm) Water (ppm) <br /> Before After Before After Before After Before After <br /> TPH(Gas) 7000 <1 .130 <.OSO Xylene 590 <0.005 0.0095 <010005 <br /> TPH(Diesel) no no no no Ethylbenzene 90 <0.005 0.0014 <0.0005 <br /> Benzene 3.5 <0.005 <0.0005 <0.o005 Olt&Grease no na na na <br /> Toluene <50 <0.005 0.0019 <0.0005 Heavy Metals Pb 11 na no no <br /> MTBE 0.024 <0.005 0.0024 xO.0005 <br /> Comments: The soil before concentrations are from a sample collected at the time of UST removal at 14 ft. BGS. The soil <br /> after concentrations are from soil boring(S&1)near UST release. The before concentrations for water are from a grab <br /> water sample at 80 feet from SBA,MTBE is from MW-3 on 9/18/03 which Is the nearest well to SB-1 the area of the <br /> release. The after concentrations for groundwater are from downgradient MWA. 80 cubic yards of soil were removed from <br /> the southern end of the western dis nsers and aerated on-site. No other active remediation has occurred at this site. <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 Pian?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 /> Monhoring/Vapor wells installed:YES Number Decommissioned: 4 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 List enforcement actions rescinded: NA 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, REHS Title: Director, Environmental Health Department <br /> Signature: Vy�� Date: <br /> VI, Central Valley Regional Water Quality Control Board(RB)Nofification <br /> [Dete Submitted to RB: 10/02103 Response Date: 10/16/03 <br /> B Staff:J. Barton Response: No further action required <br /> tle:Assoc En 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 />