Item Number: OFS94-01

INTRODUCTION: Chemical data were gathered for ground-water samples taken from five survey drill holes located in southwestern Indiana as part of a study to map the concentration of total dissolved solids (TDS) in the ground water from bedrock aquifers of Indiana. The TDS mapping project was undertaken by the Energy Resources Section of the Indiana Geological Survey (IGS) with partial funding from the Division of Oil and Gas of the Indiana Department of Natural Resources. Coordinated activities among the contracted driller (Hardesty Drilling and Testing Company, Linton, Indiana), the environmental consulting firm (ATEC Associates, Inc., Indianapolis, Indiana), and the IGS Energy Resources and Geochemistry Sections made possible the collection and analyses of water from specific aquifer units within each drill home. Water samples were collected immediately after the holes were drilled to their total depth during the months of February, March, and April 1993. In addition to the chemical analyses of the major inorganic constituents performed by the IGS Geochemistry Section, analyses of dissolved methane were conducted at the Indiana University School of Public and Environmental Affairs (SPEA). Chemical analyses performed by IGS and SPEA are tabulated in this report along with the details of the methods of analysis and quality control.

Branam, T. D., Ennis, M. V., Comer, J. B. 1994, Assessment of the 3,000 ppm and 10,000 ppm total dissolved solids boundaries in Mississippian and Pennsylvanian bedrock aquifers of southwestern Indiana: Indiana Geological Survey Open-File Study 94-01, 7 p.

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: Mississippian, geochemistry, Pennsylvanian, aquifer, tds, total dissolved solids

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