What is meant by "maximum extent practicable"?

Maximum extent practicable (MEP) is a technology-based standard established by the Clean Water Act. MEP is generally the result of emphasizing pollution prevention and source control measures primarily (as the first line of defense) and in combination with treatment methods serving as a backup (additional line of defense). As an example, erosion control is a source control measure and silt fences and fiber rolls around the perimeter of the disrupted area is a treatment control measure. The use of a combination of erosion and sediment control measures are required to meet the MEP standard.

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1. What is an illicit discharge?
2. What is meant by "maximum extent practicable"?
3. Do I need to prepare a Stormwater Pollution Prevention Plan (SWPPP)?
4. Does the SWRCB review and approve SWPPPs?