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Effects of treated municipal effluent irrigation on ground water beneath sprayfields, Tallahassee, Florida

Water-Resources Investigations Report 88-4092

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Abstract

Groundwater quality data collection began in November 1979 at a spray-irrigation site near Tallahassee, Florida, before the initial application of secondary-treated municipal wastewater in November 1980. Effects of effluent irrigation on groundwater quality were evident about 1 year after spraying began and have continued to increase during the study period of 1983-85. Chloride and nitrate concentrations in groundwater have continued to increase since about 1 year after spraying began. Nitrate-nitrogen concentrations have increased from 0.03 mg/L to as much as 11 mg/L in water from one well in the surficial aquifer and from 0.07 to 15 mg/L in one well in the Floridan aquifer system. The greatest increases in concentrations have occurred in water from wells that top the surficial and Floridan aquifers. Increase in concentration occurred in water from some wells in the Floridan outside and downgradient of pivots, indicating lateral movement within the Floridan. The increase in sodium concentrations has been similar to the in chloride concentrations. Increases increases in the concentrations of other inorganic constituents have been minor compared to increases in chloride, sodium and nitrate concentrations. Nine volatile organic halocarbon compounds were detected in 18 effluent samples. Low concentrations of two of these halocarbons--chloroform and trichloroethene (TCE)--were detected intermittently in water sampled from six wells. None of the organic compounds detected in effluent or groundwater exceeded Florida drinking water standards. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Effects of treated municipal effluent irrigation on ground water beneath sprayfields, Tallahassee, Florida
Series title:
Water-Resources Investigations Report
Series number:
88-4092
Edition:
-
Year Published:
1988
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
iv, 35 p. :ill., maps ;28 cm.