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Board adopts General Plan safety update adding mining hazards, evacuation rules and extreme-heat policies
Summary
The board adopted an updated Safety Element to Nevada County's General Plan that incorporates the 2025 Local Hazard Mitigation Plan, state evacuation requirements (SB 99, AB 747), new mining-hazard policies and extreme-heat measures; public commenters urged stronger requirements and state coordination on legacy mining and debris-dam risks.
The Nevada County Board of Supervisors voted June 9 to adopt amendments to Chapter 10 (Safety Element) of the county General Plan and the associated negative declaration, following a series of agency reviews and public comments.
Planning staff described the update as a statutory-required refresh that integrates the county's 2025 Local Hazard Mitigation Plan, implements SB 99 and AB 747 (which require local identification of residential areas lacking at least two evacuation routes and assessment of evacuation-route capacity) and expands sections on public-safety services, mining hazards, extreme heat and environmental justice.
Planning Associate Zachary Rubal said the draft added new policies for geological hazards, separated mining hazards from hazardous-materials policy and added five policies addressing extreme heat. He told the board the California Geological Survey suggested minor edits and the state Board of Forestry issued no recommended edits.
Public commenters, including long-time local mining-policy expert Izzy Martin, urged stronger, more specific county action on legacy mining hazards and on debris-control dams built during the mining era. Martin recommended that parcels with pre-21st-century debris-control dams be required to have those dams evaluated and that mining permits that could cause hazardous vibrations require geotechnical review to avoid reactivating unstable slopes.
Planning staff and environmental health said county review would defer complex contamination and remediation determinations to state technical agencies such as the Department of Toxic Substances Control (DTSC) when appropriate; supervisors directed staff to pursue coordination with state partners and to explore next steps, including potential ad hoc work with city partners.
Outcome: On a unanimous roll call the board adopted the negative declaration and amendments to the Safety Element. Staff will proceed with implementation steps and continue interagency coordination on mining and hazard-mitigation follow-up.
Provenance: Planning staff presentation (public hearing), Planning Commission recommendation (April 16), agency responses (California Geological Survey, Board of Forestry) and public comment recorded in meeting transcript (SEG 6310-7464).
