SWPPP (Stormwater Pollution Prevention Plan)
A written plan required under a project's [[concept-npdes-construction-permit|NPDES Construction General Permit]], detailing the specific erosion and sediment control measures, such as silt fencing, inlet protection, and stabilized construction entrances, a site will use to keep sediment-laden stormwater from leaving the site, along with the inspection and maintenance schedule for those controls throughout construction.
Why it matters
The permit sets the legal requirement, but the SWPPP is what actually gets inspected and enforced on the ground, so a permit on file without a SWPPP being followed in the field doesn't protect a site from a violation.
On a real project
A site superintendent's SWPPP names the specific best management practices installed around the site perimeter and requires a documented inspection of every control after any rain event producing a quarter inch (0.25 inches) or more of precipitation.
Who this matters most to
A Safety Manager or superintendent maintains the SWPPP and its inspection log day to day, work that ties closely to what a Loss Control / Risk Engineer reviews when assessing a site's environmental risk.
Where this goes wrong
A crew installs silt fencing per the SWPPP at the start of the job, then skips the required post-rain inspections for months as the schedule gets busy. Sediment escapes off site into a storm drain, and a state inspector issues a violation because the inspection logs the permit requires simply don't exist.