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<br />1 ,2-Dichloroethane (Ethylene dichloride)
<br />1, 1-Dichloroethane (Ethylidene dichloride) .
<br />1,1-Dichloroethene (Vinylidene chloride)
<br />trans-1,2-Dichloroethene ((E)-1 ,2-Dichlorothene)
<br />cis-1 ,2-Dichloroethene ((2)-1 ,2-Dichloroethene)
<br />1,2-Dichloropropane (Propylene dichloride)
<br />2,2-Dichloropropane .
<br />1 ,3,Dichloropropane (Trimethylene dichloride) .
<br />trans-1 ,3-Dichloropropene ((E)-1 ,3-Dichloropropene)
<br />cis-1,3-Dichloropropene ((2)-1 ,3-Dichloropropene)
<br />1 , 1-Dichloropropene .
<br />Diisopropyl ether (Diisopropylether (DIPE)) .
<br />Ethyl methacrylate'
<br />Ethyl tert'butyl ether (Ethyl-t,butyl ether (ETBE)) .
<br />Hexachlorobutadiene
<br />1,1,1 ,2,2,2-Hexachloroethane (Hexachloroethane)
<br />2-Hexanone (Methyl butyl ketone (MBK)) .
<br />Methyl acrylonitrile'
<br />Methyl-2-methacrylate (Methyl methacrylate) .
<br />Methyl-2-propenoate (Methyl acrylate) .
<br />2-Propenenitrile (Acrylonitrile)
<br />1,1,2,2- Tetrachloroethane'
<br />1,1,1,2- Tetrachloroethane
<br />1,2,3,4-Tetramethylbenzene (Prehnitene)'
<br />Tribromomethane (Bromoform)
<br />1,1,2- Trichloro-1,2,2-trifluoroethane (Freon 113) .
<br />1,2,4-Trichlorobenzene
<br />1 ,2,3- Trichlorobenzene .
<br />1,1,2-Trichloroethane (Vinyl trichloride)
<br />Trichlorofluoromethane (CFC 11, Freon 11)
<br />1,2,3-Trichloropropane (Allyl trichloride)
<br />
<br />Nutrients in water
<br />
<br />Study-unit frequency of detection, in percent
<br />1 National frequency of detection, in percent
<br />11 I I I I
<br />Ammonia, as N . ..
<br />80 84
<br />38 86
<br />48 75
<br />
<br />78
<br />36 71
<br />23 70
<br />
<br />Study-unit samPle, SiI
<br />
<br />87
<br />85
<br />28#
<br />o
<br />25
<br />##
<br />
<br />-
<br />--
<br />..........;.,.,....-
<br />
<br />85
<br />9
<br />33
<br />
<br />Dissolved ammonia plus organic nitrogen, as N . ..
<br />
<br />78 It .~I t f
<br />74 _
<br />62 -1M!
<br />
<br />28 ..
<br />30 -It:f,
<br />24 . -+_+.,--...-
<br />
<br />87
<br />86
<br />286
<br />o
<br />25
<br />##
<br />
<br />16
<br />5
<br />
<br />Dissolved nitrite plus nitrate, as N
<br />
<br />In ~r .~ "-r
<br />81 '--3=:
<br />~~ ~~ :..'.:.-'~;!.I~ -
<br />
<br />87
<br />86
<br />285
<br />o
<br />25
<br />##
<br />
<br />75
<br />52
<br />61
<br />
<br />Orthophosphate, as P . ..
<br />79 ILl::. .
<br />72
<br />74 ~..
<br />59 _
<br />~f ~:. *_
<br />
<br />87
<br />85
<br />286
<br />o
<br />25
<br />##
<br />
<br />28
<br />57
<br />
<br />86
<br />67
<br />81
<br />
<br />Total phosphorus, as P . ..
<br />
<br />92 n ..._ ....
<br />90 __
<br />88 _,_,
<br />
<br />87
<br />86
<br />286
<br />
<br />0.001 0.01
<br />
<br />0.1
<br />
<br />10
<br />
<br />100 1,000 10,000 100,000
<br />
<br />CONCENTRATION, IN MilLIGRAMS PER LITER
<br />
<br />30 Water Quality in the Upper Colorado River Basin
<br />
<br />Dissolved solids in water
<br />
<br />Study-unit frequency of detection, in percent
<br />1 National frequency of detection, in percent
<br />
<br />11 I I I I
<br />Dissolved solids' ..
<br />100 100
<br />100 100
<br />100 100
<br />
<br />100
<br />100 100
<br />100 100
<br />
<br />Study-unit samPI~ SiI
<br />
<br />..
<br />-
<br />
<br />1""1
<br />_III!
<br />----:+ .
<br />
<br />0.001 0.01
<br />
<br />0.1
<br />
<br />10
<br />
<br />100 1,000 10,000 100,000
<br />
<br />CONCENTRATION, IN MilLIGRAMS PER LITER
<br />
<br />Trace elements in ground water
<br />
<br />StUdy-unit frequency of detection, in percent
<br />1 National frequency of detection, in percent
<br />
<br />l'
<br />Arsenic
<br />
<br />87
<br />86
<br />296
<br />o
<br />25
<br />H
<br />
<br />Study-unit samPI~ SiI
<br />
<br />58
<br />24 36
<br />22 37
<br />
<br />~
<br />- "',-~~
<br />
<br />f=
<br />
<br />Chromium
<br />
<br />85
<br />100 79
<br />58 73
<br />
<br />..~
<br />......... .-
<br />
<br />r
<br />
<br />Uranium
<br />
<br /> 64
<br />52 35
<br />49 33
<br /> Zinc
<br /> 28
<br />4 29
<br />84 66
<br /> 0.01
<br />
<br />-~
<br />._~_,._... --
<br />
<br />--I
<br />
<br />.-
<br />
<br />1111111 ..
<br />
<br />0.1 10 100 1,000 10,000
<br />CONCENTRATION, IN MICROGRAMS PER LITER
<br />
<br />Radon-222
<br />
<br />99
<br />100 100
<br />100 97
<br />
<br />-I~.,'
<br />~...
<br />..
<br />
<br />0.01 0.1 1 10 100 1,000 10,000
<br />CONCENTRATION, IN PICOCURIES PER LITER
<br />
<br />Other trace elements detected
<br />Lead
<br />Selenium
<br />
<br />Trace elements not detected
<br />Cadmium
<br />
<br />o
<br />25
<br />H
<br />
<br />o
<br />25
<br />#5
<br />
<br />o
<br />25
<br />#5
<br />
<br />o
<br />25
<br />H
<br />
<br />100,000
<br />
<br />o
<br />25
<br />H
<br />
<br />100,000
<br />
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