The following tables summarize data collected for NAWQA studies from 1992-95 by showing results for the Rio Grande Valley Study Unit compared to the NAWQA national range for each compound detected. The data were collected at a wide variety of locations and times. In order to represent the wide concentration ranges observed among Study Units, logarithmic scales are used to emphasize the general magnitude of concentrations (such as 10, 100, or 1000), rather than the precise number. The complete dataset used to construct these tables is available upon request.
Water samples: Compounds detected || Compounds not detected
Fish tissue and bed sediment samples: Compounds detected || Compounds not detected
[mg/L, milligrams per liter; µg/L, micrograms per liter; pCi/L, picocuries per liter; %, percent; <, less than; - -, not measured; trade names may vary]
EXPLANATION
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2,4,5-T
2,4,5-TP (Silvex, Fenoprop)
2,4-DB (Butyrac, Butoxone, Embutox Plus, Embutone)
2,6-Diethylaniline (Metabolite of Alachlor)
Acetochlor (Harness Plus, Surpass)
Acifluorfen (Blazer, Tackle 2S)
Alachlor (Lasso, Bronco, Lariat, Bullet)
Benfluralin (Balan, Benefin, Bonalan, Benefex)
Bromoxynil (Buctril, Brominal)
Butylate (Sutan +, Genate Plus, Butilate)
Chloramben (Amiben, Amilon-WP, Vegiben)
Clopyralid (Stinger, Lontrel, Reclaim, Transline)
Dicamba (Banvel, Dianat, Scotts Proturf)
Dichlorprop (2,4-DP, Seritox 50, Kildip, Lentemul)
Dinoseb (Dinosebe)
Ethalfluralin (Sonalan, Curbit)
Fenuron (Fenulon, Fenidim)
Fluometuron (Flo-Met, Cotoran, Cottonex, Meturon)
Linuron (Lorox, Linex, Sarclex, Linurex, Afalon)
MCPA (Rhomene, Rhonox, Chiptox)
MCPB (Thistrol)
Molinate (Ordram)
Neburon (Neburea, Neburyl, Noruben)
Norflurazon (Evital, Predict, Solicam, Zorial)
Oryzalin (Surflan, Dirimal)
Pebulate (Tillam, PEBC)
Picloram (Grazon, Tordon)
Pronamide (Kerb, Propyzamid)
Propachlor (Ramrod, Satecid)
Propanil (Stam, Stampede, Wham, Surcopur, Prop-Job)
Propham (Tuberite)
Terbacil (Sinbar)
Thiobencarb (Bolero, Saturn, Benthiocarb, Abolish)
Triallate (Far-Go, Avadex BW, Tri-allate)
Triclopyr (Garlon, Grandstand, Redeem, Remedy)
3-Hydroxycarbofuran (Carbofuran metabolite)
Aldicarb sulfone (Standak, aldoxycarb, aldicarb metabolite)
Aldicarb sulfoxide (Aldicarb metabolite)
Aldicarb (Temik, Ambush, Pounce)
Dieldrin (Panoram D-31, Octalox, Compound 497, Aldrin epoxide)
Disulfoton (Disyston, Di-Syston, Frumin AL, Solvirex, Ethylthiodemeton)
Ethoprop (Mocap, Ethoprophos)
Fonofos (Dyfonate, Capfos, Cudgel, Tycap)
Methiocarb (Slug-Geta, Grandslam, Mesurol)
Methomyl (Lanox, Lannate, Acinate)
Methyl parathion (Penncap-M, Folidol-M, Metacide, Bladan M)
Oxamyl (Vydate L, Pratt)
Parathion (Roethyl-P, Alkron, Panthion, Phoskil)
Phorate (Thimet, Granutox, Geomet, Rampart)
Propoxur (Baygon, Blattanex, Unden, Proprotox)
alpha-HCH (alpha-BHC, alpha-lindane, alpha-hexachlorocyclohexane, alpha-benzene hexachloride)
cis-Permethrin (Ambush, Astro, Pounce, Pramex, Pertox, Ambushfog, Kafil, Perthrine, Picket, Picket G, Dragnet, Talcord, Outflank, Stockade, Eksmin, Coopex, Peregin, Stomoxin, Stomoxin P, Qamlin, Corsair, Tornade)
1,1,1,2-Tetrachloroethane (1,1,1,2-TeCA)
1,1,1-Trichloroethane (Methylchloroform)
1,1,2,2-Tetrachloroethane
1,1,2-Trichloro-1,2,2-trifluoroethane (Freon 113, CFC 113)
1,1,2-Trichloroethane (Vinyl trichloride)
1,1-Dichloroethene (Vinylidene chloride)
1,1-Dichloropropene
1,2,3-Trichlorobenzene (1,2,3-TCB)
1,2,3-Trichloropropane (Allyl trichloride)
1,2,4-Trichlorobenzene
1,2,4-Trimethylbenzene (Pseudocumene)
1,2-Dibromo-3-chloropropane (DBCP, Nemagon)
1,2-Dibromoethane (EDB, Ethylene dibromide)
1,2-Dichlorobenzene (o-Dichlorobenzene, 1,2-DCB)
1,2-Dichloroethane (Ethylene dichloride)
1,2-Dichloropropane (Propylene dichloride)
1,3,5-Trimethylbenzene (Mesitylene)
1,3-Dichlorobenzene (m-Dichlorobenzene)
1,3-Dichloropropane (Trimethylene dichloride)
1,4-Dichlorobenzene (p-Dichlorobenzene, 1,4-DCB)
1-Chloro-2-methylbenzene (o-Chlorotoluene)
1-Chloro-4-methylbenzene (p-Chlorotoluene)
2,2-Dichloropropane
Benzene
Bromobenzene (Phenyl bromide)
Bromochloromethane (Methylene chlorobromide)
Bromomethane (Methyl bromide)
Chlorobenzene (Monochlorobenzene)
Chloroethane (Ethyl chloride)
Chloroethene (Vinyl Chloride)
Chloromethane (Methyl chloride)
Dibromomethane (Methylene dibromide)
Dichlorodifluoromethane (CFC 12, Freon 12)
Dichloromethane (Methylene chloride)
Ethenylbenzene (Styrene)
Ethylbenzene (Phenylethane)
Hexachlorobutadiene
Isopropylbenzene (Cumene)
Methylbenzene (Toluene)
Naphthalene
Tetrachloroethene (Perchloroethene)
Tetrachloromethane (Carbon tetrachloride)
Total Trihalomethanes (Trichloromethane (Chloroform), Dibromochloromethane, Bromodichloromethane, Tribromomethane (Bromoform))
Trichlorofluoromethane (CFC 11, Freon 11)
cis-1,3-Dichloropropene ((Z)-1,3-Dichloropropene)
n-Butylbenzene (1-Phenylbutane)
n-Propylbenzene (Isocumene)
sec-Butylbenzene
tert-Butylbenzene
trans-1,2-Dichloroethene ((E)-1,2-Dichlorothene)
trans-1,3-Dichloropropene ((E)-1,3-Dichloropropene)
[µg/g, micrograms per gram; µg/kg, micrograms per kilogram; %, percent; <, less than; - -, not measured; trade names may vary]
EXPLANATION
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1,2,4-Trichlorobenzene
1,2-Dichlorobenzene (o-Dichlorobenzene, 1,2-DCB)
1,2-Dimethylnaphthalene
1,3-Dichlorobenzene (m-Dichlorobenzene)
1,4-Dichlorobenzene (p-Dichlorobenzene, 1,4-DCB)
1-Methyl-9H-fluorene
2,2-Biquinoline
2,4-Dinitrotoluene
2,6-Dinitrotoluene
2-Chloronaphthalene
2-Chlorophenol
2-Ethylnaphthalene
4-Bromophenyl-phenylether
4-Chloro-3-methylphenol
4-Chlorophenyl-phenylether
Acenaphthene
Acridine
Azobenzene
Benzo [c] cinnoline
C8-Alkylphenol
Isophorone
Isoquinoline
N-Nitrosodi-n-propylamine
N-Nitrosodiphenylamine
Naphthalene
Nitrobenzene
Pentachloronitrobenzene
Quinoline
bis (2-Chloroethoxy)methane
Aldrin (HHDN, Octalene)
Chloroneb (chloronebe, Demosan, Soil Fungicide 1823)
DCPA (Dacthal, chlorthal-dimethyl)
Dieldrin (Panoram D-31, Octalox, Compound 497, Aldrin epoxide)
Endosulfan I (alpha-Endosulfan, Thiodan, Cyclodan, Beosit, Malix, Thimul, Thifor)
Endrin (Endrine)
Heptachlor epoxide (Heptachlor metabolite)
Heptachlor (Heptachlore, Velsicol 104)
Isodrin (Isodrine, Compound 711)
Mirex (Dechlorane)
Oxychlordane (Chlordane metabolite)
Pentachloroanisole (PCA, pentachlorophenol metabolite)
Total Trihalomethanes (Trichloromethane (Chloroform), Dibromochloromethane, Bromodichloromethane, Tribromomethane (Bromoform))
Toxaphene (Camphechlor, Hercules 3956)
alpha-HCH (alpha-BHC, alpha-lindane, alpha-hexachlorocyclohexane, alpha-benzene hexachloride)
beta-HCH (beta-BHC, beta-hexachlorocyclohexane, alpha-benzene hexachloride)
cis-Permethrin (Ambush, Astro, Pounce, Pramex, Pertox, Ambushfog, Kafil, Perthrine, Picket, Picket G, Dragnet, Talcord, Outflank, Stockade, Eksmin, Coopex, Peregin, Stomoxin, Stomoxin P, Qamlin, Corsair, Tornade)
delta-HCH (delta-BHC, delta-hexachlorocyclohexane, delta-benzene hexachloride)
o,p'-Methoxychlor
p,p'-Methoxychlor (Marlate, methoxychlore)
trans-Permethrin (Ambush, Astro, Pounce, Pramex, Pertox, Ambushfog, Kafil, Perthrine, Picket, Picket G, Dragnet, Talcord, Outflank, Stockade, Eksmin, Coopex, Peregin, Stomoxin, Stomoxin P, Qamlin, Corsair, Tornade)
a Selected water quality standards and guidelines (Gilliom and others, in press).
b Rates of detection are based on the number of analyses and detections in the Study Unit, not on national data. Rates of detection for herbicides and insecticides were computed by only counting detections equal to or greater than 0.01 µg/L to facilitate equal comparisons among compounds that had varying detection limits; a value of <1% signifies that there were only detections below, or <1% above, the 0.01 µg/L level. Some herbicides and insecticides were not reliably detected as low as the 0.01 µg/L level, so frequencies may be underestimated for some compounds. For other compound groups, all detections were counted and detection limits for most compounds were similar to the lower end of the national ranges shown. Method detection limits for all compounds in all groups are summarized in Gilliom and others, in press.
c Detections of these compounds are reliable, but concentrations are determined with greater uncertainty than for the other compounds and are reported as estimated values (Zaugg and others, 1995).
d The guideline for methyl tert-butyl ether is between 20 and 40 µg/L; if the tentative cancer classification C is accepted, the lifetime health advisory will be 20 µg/L (Gilliom and others, in press).
e Selected sediment quality guidelines (Gilliom and others, in press).
