"Table 6.  Summary statistics for ground-water quality constituents in samples
from selected irrigation wells, Upper Republican Natural Resources District,
Nebraska, 1998-2000."					

"[M, presence of material verified but not quantified; <, less than; E, estimated;
--, not calculated]"					
					
	Unit of measurement	Number of measure-ments	Concentration		
			Minimum	Median	Maximum
Specific conductance	Microsiemens per centimeter	582	158	363	"3,330"
pH	Standard units	584	6.3	7.6	8.5
Water temperature	Degrees Celcius	569	11.6	15.2	25
Nitrate	Milligrams per liter	596	<0.03	2.7	26
Acetochlor	Micrograms per liter	54	<0.05	<0.05	0.12
Alachlor	Micrograms per liter	54	<0.05	<0.05	0.1
Atrazine	Micrograms per liter	54	M	0.04	0.22
Deethylatrazine	Micrograms per liter	54	<0.05	0.05	1.5
Metolachlor	Micrograms per liter	54	<0.05	<0.05	0.38
Prometon	Micrograms per liter	54	<0.05	--	E0.04
Propachlor	Micrograms per liter	54	M	--	E0.04
Propazine	Micrograms per liter	54	M	--	E0.01
Trifluralin	Micrograms per liter	54	M	--	--