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API Publ 4664

M00022232

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API Publ 4664 Mixing Zone Modeling and Dilution Analysis for Water-Quality-Based NPDES Permit Limits

standard by American Petroleum Institute, 05/01/1998

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This report is designed to provide an overview of the Environmental Protection Agency's (EPA) policies and technical guidance on the role of mixing zones in the NPDES permitting process; present state mixing zone regulations, policies, and guidance; introduce important concepts related to the hydrodynamics of effluent dilution in receiving waters and the design of outfall diffusers; review available mixing zone models; identify EPA sources for the models; discuss strategic issues for dischargers to consider when applying models; and describe the use of dye tracer studies as alternatives or supplements to mixing zone models.