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<br />Fenuron (Fenulon, Fenidim) . ..
<br />Fluometuron (Flo-Met, Cotoran)
<br />Linuron (Lorox, Linex, Sarclex, Linurex, Afalon) .
<br />MCPA (Rhomene, Rhonox, Chiptox)
<br />MCPB (Thistrol) . ..
<br />Metribuzin (Lexone, Sencor)
<br />Molinate (Ordram) . ..
<br />Napropamide (Devrinol) . ..
<br />Neburon (Neburea, Neburyl, Noruben) . ..
<br />Norflurazon (Evital, Predict, Solicam, Zorial) . ..
<br />Pebulate (Tillam, PEBC) . ..
<br />Pendimethalin (Pre-M, Prowl, Stomp) . ..
<br />Picloram (Grazon, Tordon)
<br />Pronamide (Kerb, Propyzamid) ..
<br />Propachlor (Ramrod, Satecid) ..
<br />Propanil (Starn, Stampede, Wham) . ..
<br />Propham (Tuberite) ..
<br />2,4,5-T ..
<br />2,4,5-TP (Silvex, Fenoprop) ..
<br />Terbacil (Sinbar) ..
<br />Thiobencarb (Bolero, Saturn, Benthiocarb) . ..
<br />Triallate (Far-Go, Avadex BW, Tri-allate) .
<br />Triclopyr (Garlon, Grandstand, Redeem, Remedy) . ..
<br />
<br />Pesticides in water-Insecticides
<br />
<br />Study-unit frequency of detection, in percent
<br />1 National frequency of detection. in percent
<br />
<br />l'AzinPho~-methYI ('Guthion, 'Gusathi~n M) .
<br />
<br />-~ i ~
<br />o 2
<br /><1
<br />
<br />Study-unit sample ~i1
<br />
<br />
<br />39
<br />o
<br />9
<br />o
<br />
<br />p,p'-DDE
<br />
<br />I-?-
<br />
<br />~
<br />iII!I--
<br />
<br />0.0001
<br />
<br />0.001
<br />
<br />0.01
<br />
<br />0.1
<br />
<br />10
<br />
<br />CONCENTRATION, IN MICROGRAMS PER LITER
<br />
<br />Other insecticides detected
<br />Carbaryl (Carbamine, Denapon, Sevin)
<br />Carbofuran (Furadan, Curaterr, Yaltox)
<br />Chlorpyrifos (Brodan, Dursban, Lorsban)
<br />Diazinon (Basudin, Diazatol, Neocidol, Knox Out)
<br />gamma-HCH (Lindane, gamma-BHC)
<br />Malathion (Malathion)
<br />cis-Permethrin (Ambush, Astro, Pounce) . ..
<br />Phorate (Thimet, Granutox, Geomet, Rampart) . ..
<br />Propargite (Comite, Omite, Ornamite) . ..
<br />Terbufos (Contraven, Counter, Pilarfox)
<br />
<br />Insecticides not detected
<br />Aldicarb (Temik, Ambush, Pounce)
<br />Aldicarb sulfone (Standak, aldoxycarb)
<br />Aldicarb sulfoxide (Aldicarb breakdown product)
<br />Dieldrin (panoram D-31, Octalox, Compound 497)
<br />Disulfoton (Disyston, Di-Syston) ..
<br />Ethoprop (Mocap, Ethoprophos) . ..
<br />Fonofos (Dyfonate, Capfos, Cudgel, Tycap) ..
<br />alpha-HCH (alpha-BHC, alpha-lindane) ..
<br />3-Hydroxycarbofuran (Carbofuran breakdown product) . ..
<br />Methiocarb (Slug-Geta, Grandslam, Mesurol) . ..
<br />Methomyl (Lanox, Lannate, Acinate) ..
<br />Methyl parathion (Penncap-M, Folidol-M) ..
<br />Oxamyl (Vydate L, Prall) ..
<br />Parathion (Roethyl-P, Alkron, Panthion, Phoskil) .
<br />Propoxur (Baygon, Blallanex, Unden, Proprotox) . ..
<br />
<br />39
<br />o
<br />9
<br />o
<br />25
<br />32
<br />
<br />100
<br />
<br />1,000
<br />
<br />Volatile organic compounds (VOCs) in ground water
<br />These graphs represent data from 16 Study Units, sampled from 1996 to 1998
<br />
<br />Study-unit frequency of detection, in percent
<br />1 National frequency of detection in percent
<br />
<br />1 Methyl t~rt-butyl ~ther (MIBE)
<br />
<br />Study'~nit sample ,511
<br />
<br />4
<br />12 16
<br />6 6
<br />
<br />o
<br />25
<br />32
<br />
<br />~~!:I
<br />-... .--
<br />
<br />1 ,2,4-Trimethylbenzene (pseudocumene)'
<br />
<br /> 19 ...... 0
<br />80 18 _]P;} I 25
<br />41 19 . ....;.. :Jo -. 32
<br /> 0.001 0.01 0.1 10 100 1,000 10,000
<br />
<br />CONCENTRATION, IN MICROGRAMS PER LITER
<br />
<br />Other VOCs detected
<br />Benzene
<br />Bromodichloromethane (Dichlorobromomethane)
<br />2-Butanone (Methyl ethyl ketone (MEK)) .
<br />n-Butylbenzene (1-Phenylbutane) .
<br />sec-Butylbenzene .
<br />Carbon disulfide'
<br />Chloroethane (Ethyl chloride) .
<br />Chloromethane (Methyl chloride)
<br />1,3-Dichlorobenzene (m-Dichlorobenzene)
<br />Dichlorodifluoromethane (CFC 12, Freon 12)
<br />Dichloromethane (Methylene chloride)
<br />Diethyl ether (Ethyl ether) .
<br />1 ,2-Dimethylbenzene (o-Xylene)
<br />1,3 & 1,4-Dimethylbenzene (m-&p-Xylene)
<br />1-4-Epoxy butane (Tetrahydrofuran, Diethylene oxide) .
<br />Ethenylbenzene (Styrene)
<br />1-Ethyl-2-methylbenzene (2-Ethyltoluene) .
<br />Ethylbenzene (Phenylethane)
<br />lodomethane (Methyl iodide) .
<br />Isopropylbenzene (Cumene) .
<br />p-Isopropyltoluene (p-Cymene) .
<br />4-Methyl-2-pentanone (Methyl isobutyl ketone (MIBK)) .
<br />Methylbenzene (Toluene)
<br />Naphthalene
<br />2-Propanone (Acetone)'
<br />n-Propylbenzene (Isocumene) .
<br />Tetrachloroethene (Perchloroethene)
<br />Tetrachloromethane (Carbon tetrachloride)
<br />1,2,3,5-Tetramethylbenzene (Isodurene) .
<br />1,1, 1-Trichloroethane (Methylchloroform)
<br />Trichloroethene (TCE)
<br />Trichloromethane (Chloroform)
<br />1 ,2,3-Trimethylbenzene (Hemimellitene) .
<br />1 ,3,5-Trimethylbenzene (Mesitylene) .
<br />
<br />VOCs not detected
<br />tert-Amylmethylether (tert-amyl methyl ether (TAME)) .
<br />Bromobenzene (Phenyl bromide) .
<br />Bromochloromethane (Methylene chlorobromide)
<br />Bromoethene (Vinyl bromide) .
<br />Bromomethane (Methyl bromide)
<br />tert-Butylbenzene .
<br />3-Chloro-1-propene (3-Chloropropene) .
<br />1-Chloro-2-methylbenzene (o-Chlorotoluene)
<br />1-Chloro-4-methylbenzene (p-Chlorotoluene)
<br />Chlorobenzene (Monochlorobenzene)
<br />Chlorodibromomethane (Dibromochloromethane)
<br />Chloroethene (Vinyl chloride)
<br />1,2-Dibromo-3-chloropropane (DBCP, Nemagon)
<br />1,2-Dibromoethane (Ethylene dibromide, EDB)
<br />Dibromomethane (Methylene dibromide)'
<br />trans-1 ,4-Dichloro-2-butene ((Z)-1,4-Dichloro-2-butene) .
<br />1 ,2-Dichlorobenzene (o-Dichlorobenzene)
<br />1 ,4-Dichlorobenzene (p-Dichlorobenzene)
<br />
<br />Water-Quality Data in a National Context 29
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