A “substantial revision” of the MND means:
- A new, avoidable significant effect is identified and mitigation measure[s] or project revision[s] must be added in order to reduce the effect to insignificance, or
- The lead agency determines that the proposed mitigation measure[s] or project revision[s] will not reduce potential effect[s] to less than significant, and new measures or revisions must be required.
In summary, a MND does not require re-circulation unless there is evidence before the lead agency that the project as proposed will have one [or more] potentially significant environmental impact[s] that has not been mitigated prior to the adoption of the MND.
Reference: 14 CCR Section 15073.5