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Geohydrology, simulation of ground-water flow, and ground-water quality at two landfills, Marion County, Indiana

Water-Resources Investigations Report 89-4100

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Abstract

Geologic, hydrologic, and water-quality data were collected at the Julietta and Tibbs-Banta landfills in Marion County. Both landfills were closed in the mid 1970's, and sewage sludge mixed with dirt was spread on the landfills in the mid 1980 's as part of a revegetation project. The landfills are constructed in unconsolidated glacial sediments that consist of sand, gravel, silt, and clay. The maximum thickness of the sediments it 180 ft at Julietta and 100 ft at Tibbs-Banta. Both landfills are underlain by sand and gravel aquifers and are adjacent to gaining streams. Groundwater flows toward and into the streams at each study area. Two sand and gravel aquifers were mapped at Julietta and four were mapped at Tibbs-Banta. The aquifers are separated in places by discontinuous clay layers. Groundwater-flow models, calibrated to simulate steady-state low-flow conditions, indicate that about 19,000 gal of water/day flow through the refuse at Julietta and about 42,000 gal/day flow through the refuse at Tibbs-Banta. Concentrations of dissolved inorganic substances in groundwater samples indicate that leachate from both landfills is reaching the shallow aquifers. The effect of the leachate on deep aquifers is minimal because of the predominance of horizontal groundwater flow and discharge to the streams. Increases in almost all dissolved constituents were observed in shallow wells that are screened beneath and downgradient from the landfills. Bromide, dissolved solids, and ammonia were useful in delineating the plume of leachate at both landfills. (USGS)

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Geohydrology, simulation of ground-water flow, and ground-water quality at two landfills, Marion County, Indiana
Series title:
Water-Resources Investigations Report
Series number:
89-4100
Edition:
-
Year Published:
1989
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
viii, 135 p. :ill. ;28 cm.