Item Number: OFS97-19

ABSTRACT: This report presents the methods, analytical results, and quality assurance and quality control (QA/QC) protocols used to determine the composition of ground water in twenty-five monitoring wells in Indiana. The ground-water monitoring is an ongoing program managed by the Acetochlor Registration Partnership (ARP), a cooperative venture of Zeneca Ag Products and Monsanto Agricultural Chemicals. The Indiana Geological Survey (IGS), at the request of the Indiana Departmetn of Natural Resources Division of Water, conducted a one-time survey of the inorganic components in the ground water from these wells. ARP's field contractor, Levine-Fricke-Recon (LFR), provided the samples according to arrangements made through the Office of the Indiana State Chemist (OISC). The survey included the measurement of temperature, conductivity, pH, alkalinity, anoins (bicarbonate, chloride, flouride, nitrate, and sulfate), major and minor elements (calcium, magnesium, potassium, sodium, aluminum, boron, iron, manganese, silicon, strontium, and zinc), and the eight primary pollutant metals (arsenic, barium, cadmium, chromium, lead, mercury, selenium, and silver). The results of this survey show that only three wells (IN-02, IN-04, IN-09) of the twenty-five wells tested had the concentration of a primary pollutant (specifically nitrate) that was above the U.S. Environmental Protection Agency's (EPA) limits for public water supply. Concentrations above the secondary standard were detected for iron in one well (IN-01), for total dissolved solids in six wells (IN-02, IN-08, IN-09, IN-11, IN-13, IN-24), and for manganese in all but four wells (IN-09, IN-10, IN-15, IN-23). No attempt was made to assess the temporal or seasonal fluctuations in the concentration of inorganic constituents during this study.

Comer, J. B., Branam, T. D., Ennis, M. V., Smith, R. T., Gilstrap, M. S., Rybarczyk, J. P. 1997, Inorganic components in ground water from twenty-five monitoring wells in Indiana: chemical analyses and QA/QC: Indiana Geological Survey Open-File Study 97-19, 12 p., 1 fig.

Notes: Publications in the Indiana Geological Survey Open-File series have been inconsistently named using a variety of series titles including "Open-File Report," "Open-File Map," and "Open-File Study." Prior to 1994, a publication in this series was generally referred to as an "Open-File Report" (but not always). To help reduce confusion created by these inconsistencies, the IGS now refers to every publication in the Open-File series as an "Open-File Study." To be entirely correct in writing a bibliographic reference for a publication, one should use the series name and number that appears on the publication itself.

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Keywords: well, geochemistry, aquifer, groundwater

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