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Assessment of DO and pH Impairments in Lakes/Reservoirs and Free-Flowing Streams

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Watershed Management to Meet Water Quality Standards and Emerging TMDL (Total Maximum Daily Load) Proceedings of the Third Conference 5-9 March 2005 (Atlanta, Georgia USA) Publication Date 5 March 2005  701P0105.(doi:10.13031/2013.18070)
Authors:   James D. Kern, David Johnson, Karen S. Kline, Phillip W. McClellan

This paper describes the methodology developed by MapTech, Inc. under contract to the Virginia Department of Environmental Quality (VADEQ) for assessing the impact of natural conditions on dissolved oxygen (DO) and pH impairments in lakes/reservoirs and free-flowing streams. According to 9 VAC 25-260-50 of Virginias State Water Control Board Water Quality Standards, the numerical criteria for DO for Class III, Nontidal Waters, is minimum of 4.0 mg/L with a minimum daily average of 5.0 mg/L, and the range for pH is 6.0-9.0. VADEQ identified six stream segments and four lakes/reservoirs within the Appomattox River watershed (USGS Hydrologic Unit Code #02080207) as impaired with regard to DO, pH, or both DO and pH. Using these waterbodies as examples, MapTech developed an approach for determining the level to which DO and pH impaired lakes/reservoirs and streams are impacted by natural conditions, and the resulting justification for proceeding with TMDL developm ent or choosing an alternative path (e.g., use attainability analysis).

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