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1、FMCSPILLSITEJuly11,1996:Tankertruckturnedoverspilling6000gallons(23000L)gasoline500ft(150m)NorthfromBearCreekEmergencyResponseTeamobservednostandinggasoline,rapidinfiltrationTheERTwasunabletolocatesubsurfacefreeproductHistoryCLUBB,MISSOURI,USAFMCSPILLSITEOverturnedTankerTruckFMCSPILLSITE

2、10ft(3m)drysiltysandtoplayer,10ft(3m)wetsandyclaywithgravelunderneathPorosity~0.4Conductivity~85ft/d(26m/d)Aquiferthickness~20ft(6m)Groundwatersurface~7ft(2m)belowgroundsurfaceGradientestimatedtobe0.0174towardsthesoutheastSiteGeologyFMCSPILLSITEFMCSPILLSITETruckLocationSpillSiteFMCSPILLS

3、ITEContractor#1(07/96)Geoprobedsitetoidentifylocationoffreeproduct(07/96)Installed4monitoringwellsSuggestedair-spargingsystem(Statedidnotapprove)Statenoticeddrillerswerenotlicensed,equipmentnotregistered(08/96)Chronologyofevents(1996)FMCSPILLSITEFMCSPILLSITEFMCGeoprobedsite,found6”(15cm)

4、freeproductalongthenorthandsouthsideofhighway(08/96)InstalledaninterceptortrenchsouthofthehighwayRecoveredfreeproductfromtrench(09/96)Chronologyofevents(1996)FMCSPILLSITEInterceptorTrenchConstructionFMCSPILLSITEInterceptorTrenchConstructionFMCSPILLSITEInterceptorTrenchConstructionFMCSPIL

5、LSITEContractor#2(09/96)Geoprobedsitetolocatefreeproductandplume(10/96)Freeproductplumeabout400ft(120m)longand100ft(30m)widePumptestshowedtranmissivitiesranging1100-2000ft2/d(100-186m2/d)Estimatedconductivitywas85ft/d(26m/d)Interceptortrenchshowed3"(8cm)freeproduct(10/96)Chronologyofeven

6、ts(1996)FMCSPILLSITEHighlevelsofBTEXmigratedtothestreamFMCSPILLSITEContractor#2(Cont.)Installed5remediationwells,deptharound24ft(7m)insideinterceptortrench(11/96)ManualoperationoffreeproductrecoverysystemstartedinJanuary1997Remediationsystemrunning24h/dhalfwayMarch1997Pumpingrates~18GPM(

7、68L/min),creatingdrawdownsof~15ft(4.5m)Chronologyofevents(96/97)FMCSPILLSITEFMCSPILLSITEFMCSPILLSITEContractor#2(Cont.)Nevergotmorethan100gallons(378L)offreeproductfromrecoverysystem(07/97)Contractorterminatedin07/97Contractor#3(07/97)Unabletocontinuewithexistingsystem,re