Abstract
The Cedar River alluvial aquifer is the primary source of
municipal water in the Cedar Rapids, Iowa area. Municipal
wells are completed in the alluvial aquifer approximately 40
to 80 feet below land surface. The City of Cedar Rapids and
the U.S. Geological Survey have been conducting a cooperative
study of the groundwater-flow system and water quality of
the aquifer since 1992. Cooperative reports between the City
of Cedar Rapids and the U.S. Geological Survey have documented
hydrologic and water-quality data, geochemistry, and
groundwater models. Water-quality samples were collected for
studies involving well field monitoring, trends, source-water
protection, groundwater geochemistry, surface-water–groundwater
interaction, and pesticides in groundwater and surface
water. Water-quality analyses were conducted for major ions
(boron, bromide, calcium, chloride, fluoride, iron, magnesium,
manganese, potassium, silica, sodium, and sulfate), nutrients
(ammonia as nitrogen, nitrite as nitrogen, nitrite plus nitrate
as nitrogen, and orthophosphate as phosphorus), dissolved
organic carbon, and selected pesticides including two degradates
of the herbicide atrazine. Physical characteristics (alkalinity,
dissolved oxygen, pH, specific conductance and water
temperature) were measured in the field and recorded for each
water sample collected. This report presents the results of
routine water-quality data-collection activities from January
2006 through December 2010. Methods of data collection,
quality-assurance, and water-quality analyses are presented.
Data include the results of water-quality analyses from quarterly
sampling from monitoring wells, municipal wells, and
the Cedar River.
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First posted January 26, 2012
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