§ 155.223 GEOLOGIC HAZARDS STUDY AREAS.

   Geologic hazard study areas are defined as, but not necessarily be limited to:

   (A)   Areas designated as Qc, Qm, Qmrf, Qms, Qms1, Qmsb, Qmsh, Qmsy, Qmso, Qmt, Qmc, Qmg, Qac, Qay, Qg, Qga, Qgy, Qgmy, Qgo, Qgao Qgm, Qgmo, Qmdf, Qaf, Qafy, Qafo, Qaf1, Qaf2, Qaf3, Qaf4, Qaf5, Qafb, Qafp, Qafoe, Qal, Qdb, Qdlb, Ql, Qlf, Qly, Qgr, Qmtr, Qmy, Qct and Tn on the most recent geologic maps published by the state’s Geological Survey (UGS, https://geology.utah.gov/). Most maps are available in the UGS interactive geologic map portal (https://geology.utah.gov/apps/intgeomap/), but contact the UGS for interim, progress update and other non-final maps that may be available, but not online; unit Qal, in and of itself, does not require a geologic hazard investigation unless other qualifiers exist, as identified in § 155.236 of this code;

   (B)   Landslide areas identified in the UGS Utah Landslide Database, available online at: (https://gis.utah.gov/data/geoscience/landslides/);

   (C)   Areas requiring slope stability analyses as defined in § 155.236 of this code below;

   (D)   All properties located on alluvial fans and drainage channels subject to flash flooding and/or debris flows;

   (E)   Other previously identified geologic hazards that the county finds to be of significance to the health, safety and welfare of the citizens of the county; and

   (F)   Site-specific surface fault rupture investigations are required for all critical facilities and structures for human occupancy (International Building Code (IBC) Risk Category II, III and IV) along latest Pleistocene-Holocene faults, and for critical facilities (IBC Risk Category IV) along late Quaternary and Quaternary faults. For noncritical facilities for human occupancy (IBC Risk Category II and III) along late Quaternary and Quaternary faults, investigations are recommended, but not required. See the UGS Utah Quaternary Fault and Fold Database to locate Quaternary age faults within the county and to determine their activity class (https://geology.utah.gov/apps/qfaults/index.html).

(Prior Code, § 8-5I-4) (Ord. 10-02, passed 6-1-2010; Ord. 19-09, passed 10-15-2019; Ord. 21-07, passed 6-15-2021)