Civil Infrastructure Inspection 17 items
MS4 Stormwater Outfall & BMP Inspection (NPDES)
Municipal separate storm sewer system inspection of outfalls for illicit discharge and of structural stormwater BMPs for function under the NPDES MS4 permit.
NPDES MS4 Permit (CWA)EPA 40 CFR 122.34Construction & Post-Construction Stormwater
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Inspection Setup
- Outfall / BMP asset ID *
- Inspection date *
- Is the inspection during dry weather (>48-72 hr since last significant rain) for illicit discharge screening? *
Outfall Illicit Discharge Screening
- Is there any dry-weather flow at the outfall? *
- Is the discharge free of odor, color, turbidity, oil sheen, or floatables? *
- Are field screening parameters (if flow present) within expected ranges?
- Is the outfall structure free of scour, erosion, or structural damage?
Structural BMP Condition
- Is the BMP (detention/retention/bioretention/filter) free of excessive sediment accumulation? *
- Are inlet and outlet structures unobstructed and functioning? *
- Is the BMP free of erosion, bypass channeling, or embankment damage?
- Is vegetation established and maintained (for vegetated BMPs)?
Housekeeping & Pollution Sources
- Is the drainage area free of illegal dumping, staining, or exposed pollutant sources?
- Is trash / debris accumulation within acceptable limits?
- Are nearby industrial/commercial connections free of evidence of improper discharge to the storm system?
Findings & Follow-up
- Is maintenance, cleanout, or corrective action required? *
- Is an IDDE investigation / enforcement referral warranted for suspected illicit discharge? *
- Photograph outfall/BMP condition
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