Transcription of Water Quality-Based Effluent Limits
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Water Quality-Based Effluent Limits
Chapter 6 Water Quality-Based EffluentLimitsPermit writers must consider the impact of every proposed surface waterdischarge on the quality of the receiving Water . Water quality goals for a Water bodyare defined by State Water quality standards. A permit writer may find, by analyzingthe effect of a discharge on the receiving Water , that technology-based permit limitsare not sufficiently stringent to meet these Water quality standards. In such cases, theCWA and EPA regulations require development of more stringent, Water quality -basedeffluent Limits (WQBEL) designed to ensure that Water quality standards are met. Inorder to develop effective WQBELs, permit writers must be familiar with State waterquality standards methods for predicting Water quality impacts from discharges, andprocedures for establishing WQBELs.
deemed necessary to support the designated uses of each water body. Section 303(a-c) of the CWA requires States to adopt criteria sufficient to protect designated uses for State waters. These criteria may be numeric or narrative. The CWA requires States to adopt numeric criteria for certain toxic pollutants where they are necessary
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