Understanding Contamination Flags
NVES uses contamination flags to quickly communicate the environmental status of a project. Here's what each flag means and how they're triggered.
Flag Types
- Clean — All lab results are within acceptable limits, or no testing has been conducted yet
- Contaminated — One or more lab results exceed baseline levels but are below hazardous thresholds
- Hazardous — Lab results indicate contamination at or above hazardous levels
Automatic Flagging
When a lab result is entered with is_compliant set to 0 (non-compliant), the system automatically:
- Updates the project's contamination status
- Changes the map marker color
- Generates an alert for project stakeholders
- Logs the change in the audit trail
Clearing Flags
A contamination flag can be cleared when subsequent lab results demonstrate that contaminant levels have returned to acceptable limits. This typically requires multiple passing tests over a defined period.