Guam Hazard Mitigation Plan - Western States Seismic Policy Council

SECTIONSIXMitigation StrategyTable 6–2Potential Mitigation ActionsAction No.DescriptionUtilize LiDAR data to update the Digital Flood Insurance Rate Maps (DFIRM), and model3tsunami inundation and stormwater infrastructure drainage.Mitigate RL properties and other flood-prone properties through elevation, acquisition, and4floodproofing or other minor flood control management efforts.Elevate, retrofit, or otherwise protect bridges and road segments, especially those provide ingress5 and egress to essential facilities, that are susceptible to flooding, landslides, and earthquakes.Fund a study to evaluate vulnerability of these facilities to tsunami events.Develop and implement a process for assessing the hazard vulnerability of school buildings andgrounds designated as storm shelters. Upon completion of vulnerability assessment, retrofit6 buildings and grounds by installing typhoon shutters or replacing windows and doors. Thisproject will mitigate against multiple hazards, including tropical cyclone, severe wind, anddisease events.Replace overhead 34.5 kV transmission lines and 13.8 kV underbuilt lines to underground7 systems of conduits and cables. Electrical services to customers along the transmission linerouting will be fully converted to underground (northern, central, and southern parts of Guam).Replace outdoor circuit breaker conversion to indoor switchgear type with relay/control panels8 within a solid building along with associated conversion of overhead circuit connections intounderground new switchgear.9 Stabilize telemetry systems for domestic water and sewer systems.10 Replace septic tank systems over the aquifer with a public sewer system.Weatherize operating controls, pumps and generators for the potable water and wastewaterfacilities (e.g., upgrade electrical equipment to include storm rate electrical cabinets for the11Agana Main, Fujita, Route 16, and Tai sewer pumpstations as well as the Pago Bay Booster ).Protect all such facilities located within tsunami inundation zones.Install 30-inch 16,000-feet of sewer relief gravity lines or other feasible alternative, e.g., force12main, for the Hagatna-Tamuning – Tumon Sewer Service Redundancy project.13 Upgrade the Bayside Sewer Pump station and repair and improve the access road to the station.Upgrade and improvement water intake structure at the Ugum Water Treatment Plan & Intake14Structure.Evaluate all the buildings within the DPW compound for seismic and wind hazard safety. Retrofit(i.e., reinforce exterior walls, anchor foundations, install new doors, windows, and typhoon15shutters) or demolish and rebuild vulnerable facilities, especially those that do not meet thecurrent code for seismic events and wind loads.16 Procure and institute a building permit tracking software system shared by all review agencies.Establish the GHMO as a permanent full-time position in the HS/OCD with funding provided in17HS/OCD’s annual operating budget.Ensure that the HMAC meets annually and provide the necessary support for this meeting to18occur.Obtain funding to update the Guam Hazard Mitigation Plan every 3 years or after a major19disaster, if need be.Create an enforceable program to identify and demolish abandoned buildings that pose a health20or safety threat.Implement applied and emerging vegetation management activities along the interface andintermix hazard areas to mitigate against fire or severe wind events. Examples include creating21 fuel breaks to separate housing encroachment from brush fields, mechanically constructing firebreaks within brush fields and forests, or trimming foliage posing a threat to power lines or otherelectrical infrastructure.22Harden industrial park infrastructure by relocating all utilities (e.g., power lines, cable, etc.)underground to prevent any damage to the utilities and any associated costs as a result of future6-20