This Revised/Supplemental Draft EIR/EIS has been prepared and is being made available pursuant to both CEQA and NEPA and presents a new biological resources analysis for monarch butterfly and an analysis of a design variant for the Millbrae Station, neither of which were included in the Draft EIR/EIS.
https://hsr.ca.gov/programs/environmental-planning/project-section-environmental-documents-tier-2/san-francisco-to-san-jose-project-section-draft-environmental-impact-report-environmental-impact-statement/
For your reading pleasure...