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Scientific Investigations Report 2006-5110

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StreamVOC—A Deterministic Source-Apportionment Model to Estimate Volatile Organic Compound Concentrations in Rivers and Streams

By William E. Asher, David A. Bender, John S. Zogorski, and Roy C. Bartholomay

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This report documents the construction and verification of the model, StreamVOC, that estimates (1) the time- and position-dependent concentrations of volatile organic compounds (VOCs) in rivers and streams as well as (2) the source apportionment (SA) of those concentrations. The model considers how different types of sources and loss processes can act together to yield a given observed VOC concentration. Reasons for interest in the relative and absolute contributions of different sources to contaminant concentrations include the need to apportion: (1) the origins for an observed contamination, and (2) the associated human and ecosystem risks. For VOCs, sources of interest include the atmosphere (by absorption), as well as point and nonpoint inflows of VOC-containing water. Loss processes of interest include volatilization to the atmosphere, degradation, and outflows of VOC-containing water from the stream to local ground water.

This report presents the details of StreamVOC and compares model output with measured concentrations for eight VOCs found in the Aberjona River at Winchester, Massachusetts. Input data for the model were obtained during a synoptic study of the stream system conducted July 11–13, 2001, as part of the...>>MORE

For more information about USGS activities in South Dakota, visit the USGS South Dakota Water Science Center home page.

For more information about USGS National Water-Quality Assessment Program, visit the NAWQA Program home page or for more information about the USGS National Water-Quality Assessment Program Volatile Organic Compound National Syntheses, visit the VOC National Synthesis home page.

Version 1.0

Posted October 2006

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StreamVOC Executable File
This is the executable version of the StreamVOC model and has been tested under all 32-bit versions of Microsoft Windows operating systems through Windows XP. StreamVOC can be installed to run using a shortcut from the desktop, double clicking on the file StreamVOC.exe in Windows Explorer, or from the Start/Program/Run menu. Apart from copying the executable file to a particular location, no other installation steps are required for StreamVOC.

Send questions or comments about this report to J.S. Zogorski (605) 394-3214.

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