30 September 1999
1-4. Seismic Use Groups. The following Seismic Use Groups are established based on the
occupancy or function of a building.
a. Group IIIE. Seismic Use Group IIIE buildings are those containing essential facilities
required for post-earthquake recovery, and/or those structures housing mission-essential
functions. Mission-essential functions are those absolutely critical to mission continuation of the
activity (there is no redundant back-up facility on- or offsite) as determined by the Commanding
Officer at the activity and/or the Major Claimant.
b. Group IIIH. Seismic Use Group IIIH buildings are those containing substantial quantities
of hazardous substances that could be dangerous to the safety of the public, if released.
c. Group II. Seismic Use Group II buildings are those that constitute a substantial public
hazard because of the occupancy or use of the building.
d. Group I. Seismic Use Group I buildings are those that are not assigned to Seismic Use
Groups II or III.
e. Hazardous Critical Facilities. These facilities (e.g., nuclear power plants, dams, and LNG
facilities) are not included within the scope of this document, but are covered by other
publications or regulatory agencies. For any facilities housing hazardous items not covered by
criteria in this document, guidance should be requested from DAEN-ECE-D (Army), NAVFAC
Code 04BA (Navy), or HQ USA/LEEE (Air Force).
Examples of buildings or structures in each of the above groups are provided in table 1-1.
with multiple occupancies will be categorized according to the most important occupancy unless
the portion of the building that houses the most important occupancy can be shown to satisfy all
the requirements for that occupancy.
Historic Military Buildings. Historic military buildings, in general, are required to meet the
same minimum life-safety objectives as all other buildings in the federal inventory.