The following tables summarize data collected for NAWQA studies from 1992-95 by showing results for the Nevada Basin and Range Study Unit compared to the NAWQA national range for each compound detected. The data were collected at a wide variety of places 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 1,000), rather than the precise number. The complete dataset used to construct these tables is available upon request.
Concentrations of herbicides, insecticides, volatile organic compounds, and nutrients detected in ground and surface waters of the Nevada Basin and Range Study Unit. [mg/L, milligrams per liter; µg/L, micrograms per liter; pCi/L, picocuries per liter; %, percent; <, less than; - -, not measured]
Herbicides2,4,5-T2,4,5-TP 2,4-DB 2,6-Diethylaniline (Metabolite of Alachlor) Acifluorfen Benfluralin Bentazon Bromoxynil Butylate Chloramben Clopyralid Dacthal mono-acid (Dacthal metabolite) Dicamba Dinoseb Ethalfluralin Fenuron Fluometuron MCPA MCPB Molinate Napropamide Neburon Norflurazon Picloram Pronamide Propachlor Propanil Propham Thiobencarb Triallate Triclopyr |
Insecticides3-Hydroxycarbofuran (Carbofuran metabolite)Aldicarb sulfoxide (Aldicarb metabolite) Aldicarb Azinphos-methyl Disulfoton Ethoprop gamma-HCH Methiocarb Methyl parathion Oxamyl Parathion Phorate Propargite Propoxur Terbufos cis-Permethrin Volatile organic compounds1,1,1,2-Tetrachloroethane1,1,2,2-Tetrachloroethane 1,1,2-Trichloroethane 1,1-Dichloroethane 1,1-Dichloropropene 1,2,3-Trichlorobenzene 1,2,3-Trichloropropane 1,2,4-Trichlorobenzene 1,2,4-Trimethylbenzene 1,2-Dibromo-3-chloropropane 1,2-Dibromoethane 1,2-Dichloropropane |
1,3,5-Trimethylbenzene
1,3-Dichlorobenzene 1,3-Dichloropropane 1,4-Dichlorobenzene 1-Chloro-2-methylbenzene 1-Chloro-4-methylbenzene 2,2-Dichloropropane Bromobenzene Bromomethane Chlorobenzene Chloroethane Chloroethene Chloromethane Dimethylbenzenes Ethenylbenzene Ethylbenzene Hexachlorobutadiene Isopropylbenzene Methylbenzene Naphthalene Tetrachloromethane cis-1,2-Dichloroethene cis-1,3-Dichloropropene n-Butylbenzene n-Propylbenzene p-Isopropyltoluene sec-Butylbenzene tert-Butylbenzene trans-1,3-Dichloropropene NutrientsNo non-detects |
Semivolatile organic compounds1,2,4-Trichlorobenzene1,2-Dichlorobenzene 1,2-Dimethylnaphthalene 1,3-Dichlorobenzene 1,4-Dichlorobenzene 1,6-Dimethylnaphthalene 1-Methyl-9H-fluorene 1-Methylphenanthrene 1-Methylpyrene 2,3,6-Trimethylnaphthalene 2,4-Dinitrotoluene 2,6-Dinitrotoluene 2-Chloronaphthalene 2-Chlorophenol 2-Ethylnaphthalene 2-Methylanthracene 4,5-Methylenephenanthrene 4-Bromophenyl-phenylether 4-Chloro-3-methylphenol 4-Chlorophenyl-phenylether 9H-Carbazole 9H-Fluorene Acenaphthene |
Acenaphthylene
Acridine Anthraquinone Azobenzene C8-Alkylphenol Dibenz [a,h] anthracene Dibenzothiophene Isophorone N-Nitrosodi-n-propylamine N-Nitrosodiphenylamine Naphthalene Nitrobenzene Pentachloronitrobenzene Phenanthridine Quinoline bis (2-Chloroethoxy)methane |
Organochlorine compoundsAldrinChloroneb DCPA Dieldrin Endosulfan I Endrin Heptachlor epoxide (Heptachlor metabolite) Heptachlor Hexachlorobenzene Isodrin Mirex PCB, total Pentachloroanisole (PCA, pentachlorophenol metabolite)Toxaphene alpha-HCH beta-HCH cis-Permethrin delta-HCH gamma-HCH o,p'-Methoxychlor p,p'-Methoxychlor total-Chlordane trans-Permethrin |
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 in order to facilitate equal comparisons among compounds, which had widely varying detection limits. For herbicides and insecticides, a detection rate of "<1%" means that all detections are less than 0.01 µg/L, or the detection rate rounds to less than 1 percent. For other compound groups, all detections were counted and minimum detection limits for most compounds were similar to the lower end of the national ranges shown. Method detection limits for all compounds in these tables are summarized in [58].
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 [66].
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 [58].
e Selected sediment-quality guidelines [58].