The 2010 Decommissioning Plan for the Maunakea Observatories (pdf), a sub-plan of the Maunakea Comprehensive Management Plan, describes a 4-step decommissioning process for observatories to follow when preparing a Site Decommissioning Plan (SDP) for removal of an observatory followed by site restoration. 

Site Decommissioning Plan (SDP)

  1. Notice of Intent (NOI)
  2. Environmental Due Diligence
    (including a Phase 1 Environmental Site Assessment,
    Phase 2 Environmental Site Assessment – if needed, and
    Remedial Action Plan – if needed)
  3. Site Deconstruction & Removal Plan
  4. Site Restoration Plan

The Office of Maunakea Management (OMKM) role in decommissioning is to coordinate the overall process and coordinate with the State of Hawaiʻi, Department of Land & Natural Resources (DLNR).  The respective observatory is responsible for preparing the Site Decommissioning Plan along with compliance and permit documents and implementing decommissioning.

Current Decommissioning Documents

Caltech Submillimeter Observatory (CSO)

  1. Notice of Intent: submitted. Plus  Addendum with updated Site Plan.
  2. Environmental Due Diligence: pending
  3. & 4. Visit the CSO website for periodic updates on the current draft of these documents and related compliance materials

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UH Hilo Hoku Kea (Hoku Kea)

  1. Notice of Intent: submitted
    See also the Final Environmental Assessment: University of Hawai‘i 24-inch (0.6 meter ) Telescope Observatory Renovation
  2. Environmental Due Diligence: pending


The State of Hawaiʻi, Department of Land & Natural Resources, Office of Conservation & Coastal Lands also provides access to astronomy-related documents, including decommissioning.

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