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Quality of water from publicsupply wells in the principal aquifers 12
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95 percent confidence Alkalinity Alkalinity and hardness aquifer Arkansas River Arsenic bacteria bacteria colonies biochemical oxygen demand Cadmium Celsius centile imum ation centile Median Mean centimeter at 25 Chlamydomonas CHLOROPHYTA Chromium codes see table colonies per 100 Copper Cryptomonas CRYPTOPHYTA discharge cubic feet Dissolved chloride Dissolved magnesium Dissolved solids Dissolved sulfate estimate mg/L five-digit numbers hardness are reported imum ation Discharge Includes only discharges liter mg/L Mean centile imum Median Mean centile micrograms per liter milligrams per liter milliliter N=number of observations nephelometric turbidity units nitrate Total ammonia nitrogen numbers in parentheses=bacteria Ouachita River parentheses=bacteria parameter codes Pennales percent confidence level phosphorus phytoplankton Property N imum recoverable in micrograms reported as CaC03 reported as SO4 SC=specific conductance significant at 95 streptococci sulfate is reported Total alkalinity Total nitrite total or total total recoverable turbidity nephelometric turbidity U.S. Geological Survey Units are milligrams water-quality sample Zinc zinc total