CESSWI Post-Construction BMP Maintenance and Long-Term Controls Flashcards
6 cards from real CESSWI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 6 CESSWI Post-Construction BMP Maintenance and Long-Term Controls flashcards as text
Under the EPA's Construction General Permit (CGP), when is a permittee typically required to transition from construction-phase BMPs to post-construction stormwater controls?
Answer: When the site reaches final stabilization and permit coverage is terminated
Permit coverage — and the obligation to maintain construction BMPs — ends when final stabilization is achieved and the Notice of Termination (NOT) is filed, at which point long-term post-construction controls take over.
A dry extended-detention basin is a post-construction BMP designed primarily to:
Answer: Detain stormwater temporarily to reduce peak discharge rates and allow sediment settling
Dry extended-detention basins hold runoff for an extended period (typically 24–40 hours) after a storm to attenuate peak flows and remove suspended sediments before releasing water.
Which post-construction BMP is specifically designed to reduce both runoff volume and pollutant loading through infiltration and evapotranspiration?
Answer: Bioretention cell (rain garden)
Bioretention cells use engineered soil media and vegetation to infiltrate, filter, and evapotranspirate stormwater, removing pollutants through physical, biological, and chemical processes.
During a post-construction inspection of a wet retention pond, an inspector observes the permanent pool is 50% smaller than the design volume due to sediment accumulation. The required action is to:
Answer: Notify the owner that sediment must be removed to restore design storage capacity
Excessive sediment accumulation reduces the pond's water quality treatment volume and hydraulic performance; the owner must restore the pond to design capacity through sediment removal.
Permeable pavement is classified as which type of Low Impact Development (LID) stormwater practice?
Answer: Volume reduction / green infrastructure BMP
Permeable pavement allows runoff to infiltrate through the surface into a gravel reservoir below, reducing total runoff volume — the defining characteristic of a green infrastructure/LID approach.
Which inspection finding would trigger an immediate corrective action for a post-construction outlet structure?
Answer: Outlet pipe fully blocked with debris, causing the basin to overflow its embankment
A blocked outlet that causes embankment overtopping is an emergency condition — uncontrolled overflow can erode and fail the embankment, causing catastrophic downstream flooding.