Item Number: OFS00-02

ABSTRACT: This report presents the methods, analytical results, and quality assurance and quality control (QA/QC) protocols used to determine the composition of surface water at eight monitoring sites in the northeastern drainage of Augusta Lake in Pike County, Indiana (fig. 1). The monitoring was designed to document the effectiveness of passive reclamation on the quality of water entering Augusta Lake, which discharges highly acidic water into Mill Creek and the Patoka River. The Indiana Geological Survey (IGS), Indiana University Department of Geological Sciences (DGS), Indiana University Department of Recreation and Park Administration (DRPA), and the U.S. Fish and Wildlife Service (USFWS) collaborated to execute the monitoring and analyses. The water quality measurements included temperature, specific conductivity, turbidity, salinity, dissolved oxygen, oxidation-reduction potential (Eh), pH, alkalinity, acidity, anions (bicarbonate, carbonate, chloride, nitrate, and sulfate), and major and minor metals (calcium, magnesium, potassium, sodium, total iron, ferrous iron, manganese, zinc, nickel, strontium, barium, aluminum, silicon, and copper). The monitoring program began in February 1997 and ended in December 1998. More than 95 percent of the analyses reported here were within ±10 percent of ionic charge neutrality and, therefore, are concluded to be of acceptable quality. The pH of water at all sites, other than the discharge from the successive alkaline-producing system (SAPS) and site 7 where surface water and SAPS outflow mix, remained acidic throughout the monitoring period. Acidity and pH varied seasonally at sites 1, 2, 4, and 6, with pH being lowest and acidity highest during the warm months from late spring to early fall. Although Augusta Lake remained strongly acidic (pH = 3.1-4.4) throughout the monitoring period, the outflow contained little or no detectable iron, indicating that natural processes operating in the lake efficiently remove iron from solution.

Comer, J. B., Ennis, M. V., Branam, T. D., Welp, L. R., Morales, N. E., Sobiech, S. A., Simon, T. P. 2000, Effects of passive reclamation on water quality in the northeastern drainage of Augusta Lake, Pike County, Indiana: chemical analyses and QA/QC: Indiana Geological Survey Open-File Study 00-02, 19 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: chemistry, water, lake, Augusta Lake, water quality, chemical analysis, acid mine drainage, QA/QC, passive reclamation

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