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.� i _ �. .in r ,3.. • � .S .SwJ 1, *r Y � r • � 10/12/1995 20:44 9163519357 ANNE M FAIR PAGE 12 • s i • ♦ tt J ♦ M ♦ qts-i � EXPLANATION 0 KAWQA Lstim Wild UWSLISM • kAWOA ARaalaaW LWA-lea SWM • srT9E%6=W Loaaaona counsas Sim powdol use of rRrI E MT9e r0.r WO&MM i.�..U 0 lh—dw Ae"1°1 Two OOMM rwww+y M 7 M MTIK UM UM oM IRSA us,Eaoiiv orwi>ruche AqMdy brie 1. Lomwn of urban and agricultural areas studied,and bmbws wtd"MTBE may be released and VAd KM mixes with aasohae and.is snhible iA water 61001101, use areas to allow OMMmnson of shallow siatuid-water and other ethers.Beause of its chemosI charaaedsho, gttatq with lead use Urban wells wen ioated in industrial. MTBE would be expected to be food ptlmadly in the Mime- eonimerciat tesldendal,and recreations areas.wto le agd- Fand in water Results of a aputat model used by —111Kal wells Were bated in various crop areas vuoument omCanada(at mma erti Ontaao xbowed that of MTBE in the environrnent shoold be found ra vVinrquabti tlsta fsm vm urban and ascwbiieat aret+,i slw W 56 petpem tlae Err,43 resat in surface water now only ab,049 OS per- that MTBE occurs prtmr dooantly shallow`round water cent in sotl or stnambed sahment "Ibis model pte4iats irodgrbi'g urban area MTBE was detected to 27 percent where MTBE may be found to the environment but needs io of ncb.n wells,and in t3 paint of assicviborat wells ds- be venf cd by eoviroomenlitt samphog Although MTBE tsabuted across the United Sites,with concentrations Will volatilize from soils,n Is also highly mobile m soil and owFug from len than the deseclion level of 02 pall-to can move into Found water;Once in Found water.MTBE 23pw pgjq-T k eoomotradons of MTBF-in ground water tease deny when eonipaitil to other rwhae components flora eight utbaa areas at shown in figure 3.when lake benzene to suffice water,MTBE a oat a:peet6d b bio- detected,the median eeeoei>1rallon of MTB.was a6 p&q. aoaimulose so aguagc oq aasms MIBB wax detwed is shallow`touod water is all nth It is hyp0eh mad that MTBE moves with.rater in the tubas Wod-rise sm6es but was detected in ground water bydrabye cycle(fin 2),but main data an oacded to deter from only 3 of 20 opicuitaral aeras studied.For the urban - - awc the extent of the movement.MTBE is released to the areas,MTBE vas most frequently detected in Deaver.Colo- air hvm soumvs such as iudtsvtry and vehicles.Ogee in the ado,sad as urban mem in New F, gkod(fig 4) In Den%er, air,MTBE can unix with rwopitation that may cvenmatly 79 percent of the shallow urban wells(Z3 of 29 wells)had carry MTBE to the around water or to arrams The MTBE detectable cOOQnowwas of MTBK and to New Fnglaod detected to snow somples colk and in Denver.Colorado by (specifically urban areas within Cooediw�yassadinseets. U S Geobaial Survey+dentists supports tins hypcthclb- and vetimont).37 petug of tbo wefts(13 of 33 veils)had Altemagvely gasoline sells tray duecdy eontnbute In detectable arnoeatmilons of MTBE.Other iubiw areas MTBE eontadsation of around water and=&cis water: Nwhom MTBE Wet worth,dguctod luded Ren yo,Nevada, . Las VeSes.Nevada, Whore, how frequently, and at what con- Atlasta.Georgia;Lod AbuquerqLie.New Mtuco %Mdun eentradons is MTBE found In shallow �n cultural laud-me areas.%MF.was detected in southern ground water? _ Colorado,New England,and,eastern Penns)lvama The conaeatrations or MTBt and.other VOCs war Ml'I3E was the second moss commonly deeded vOC in ineaxutod la samples of shallow SMOA water firm 2 it water from tarbaa wells,Of the 211 urban•ctb tested. urban trolls nzW 324 aaneulmrol wells in 1993-94-These 23 peraeat kind cWoreforra.27 percent had MTPX, IS per MatotonoE wells an bated in!urban and 20 agricultural cant bad a ttacbloroetheoe, 10 peanut bad ttschkawtbror areas.These urban areas were l aW whets MME win 7 percent had cis-1.2&chluawthena,5 ptrcrot bad 1,1- released so the eavlrommat by industry or is potandally dichlorciatbaae,and S pwwut bad benzene Their are many used to aasobne Some of the wells were eowU%wWd for the poteunal sowces for these other clietwcats,hout•er i,l- KA%VQA studles,whems others vers exisdoe WHO We111 diehlotood sa•and brazeno an used in guollor and rhlo- fpr these studies weft madomly looted Within Vmk 4nd- rofotm has been identified to automobile ethaase