Item Number: OFS01-07

INTRODUCTION: This report is an amendment to the Quality Assurance Project Plan for the Potential Nonpoint Source Contamination of the Spring Mill Lake Drainage Basin, Indiana Geological Survey Open-File Studies, OFS99-11. Included in this document are the quality control (QC) statements for the field sampling and laboratory work for nitrogen isotope analyses. The Indiana Geological Survey assumes responsibility for collecting all water samples in the field. The nitrogen isotope analyses are performed at the University of Nebraska Water Sciences Laboratory in Lincoln, Nebraska.

Hasenmueller, N. R. 2001, Amendment to quality assurance project plan for potential nonpoint source contamination of the Spring Mill Lake drainage basin: Indiana Geological Survey Open-File Study 01-07, 17 p., 3 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: geochemistry, hydrology, environmental geology, Spring Mill Lake, isotope

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