January 18, 2018

Mixing Zone Analysis: Take Control of Permit Limits

Adrienne Nemura (Michigan), Robert Annear (Oregon), Rishab Mahajan (Illinois) have authored a water quality whitepaper entitled "Mixing Zone Analysis: Take Control of Permit Limits."

Geosyntec's Mixing Zone Whitepaper discusses the use of mixing zones and their applicability. It also provides examples of how to incorporate mixing zone principles and analysis into the permit process to reduce overall treatment complexity and capital and operations and maintenance costs while still meeting instream standards.

Water quality standards can result in overly stringent effluent permit limits and subsequent treatment upgrades that do not improve water quality. The Clean Water Act offers flexible approaches that are not always fully used. Some permit writers may be reluctant to initially consider these approaches, resulting in cost-prohibitive treatment plant upgrades to meet instream water quality standard at the end of the pipe. The use of mixing zones in receiving waters is an example of an alternative approach that provides permitting flexibility.

Adrienne Nemura is a Senior Principal Water Resources Engineer based in Michigan with more than 30 years of experience focused on helping clients identify cost-effective and sustainable solutions to meet their water quality goals. She has worked for more than 40 cities and wastewater utilities and also state and federal regulatory agencies, industrial facilities, airports, attorneys, consulting firms, non-profit organizations, and trade associations.

Robert Annear is a Senior Principal Water Resources Engineer based in Oregon with more than 18 years of experience focused on the development and calibration of hydrodynamic and water quality models for local, state and federal agencies, law firms, and clients in the mining, paper, aviation, hydropower, and water supply sectors.

Rishab Mahajan is a Project Engineer involved in hydrodynamic, sediment transport, and water quality modeling with a focus on regulatory permits and requirements, stormwater management, surface water system assessments, Total Maximum Daily Load (TMDL) development and implementation, and nutrient criteria limit development. He has six years of experience in the development and calibration of hydrodynamic, sediment transport and water quality models, including one-, two-, and three-dimensional models. He specializes in geographic information system (GIS) analysis and programming in Java, Visual Basic, and database management.

More Information

Download the whitepaper: Mixing Zone Analysis: Take Control of Permit Limits
For consultation regarding mixing zone analysis, contact Adrienne Nemura at This email address is being protected from spambots. You need JavaScript enabled to view it. or Robert Annear at This email address is being protected from spambots. You need JavaScript enabled to view it..
Learn more about Adrienne at: https://www.geosyntec.com/people/peter-zeeb
Learn more about Robert at: https://www.geosyntec.com/people/robert-annear
Learn more about Rishab at: https://www.linkedin.com/in/rishabmahajan/

Geosyntec Consultants
Geosyntec is a specialized consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural resources, and civil infrastructure.

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