Chapter 30.51A
DEVELOPMENT IN SEISMIC HAZARD AREAS

Sections:

30.51A.010    Purpose

30.51A.020    Applicability.

30.51A.030    Fault setback requirements.

30.51A.040    Additional information or tests authorized.

30.51A.010 Purpose

The purpose of this section is to protect the public health, safety and welfare by preventing the placement of certain buildings and structures located within seismic hazard areas over known active faults, and to protect certain essential facilities from seismic events.

(Added Ord. 06-075, Oct. 4, 2006, Eff date Oct. 15, 2006)

30.51A.020 Applicability.

(1) This chapter shall apply to all development applications and actions requiring project permits for any building or structure, excluding single-family and duplex dwellings and their accessory structures, located within a seismic hazard area and assigned to occupancy category I, II, III or IV, and buildings or structures assigned to seismic design categories D, E or F. The occupancy category and seismic design category for a building or structure is determined in accordance with section 1613 of the International Building Code (IBC) and the American Society of Civil Engineers 7 standards.

(2) Seismic design categories are used to determine permissible structural systems, limitations on height and irregularity, those components of the structure that must be designed for seismic resistance, and the types of lateral force analysis that must be performed pursuant to section 1613 of the IBC relating to earthquake loads or chapter 11 of ASCE 7.

(Added Ord. 06-075, Oct. 4, 2006, Eff date Oct. 15, 2006; Amended Ord. 07-089, Sept. 5, 2007, Eff date Sept. 21, 2007; Amended by Ord. 17-059, Oct. 18, 2017, Eff date Nov. 9, 2017)

30.51A.030 Fault setback requirements.

A building or structure assigned to seismic design category D, E or F as defined in Section 1613 of the IBC or ASCE 7 shall not be sited over an identified active fault.

(1) Where a development application or action requiring a project permit for any building or structure is located within a seismic hazard area, the applicant shall provide a geotechnical report consistent with the requirements of section 1803 of the IBC and SCC 30.62B.140. In addition to any other requirements, the geotechnical report shall include adequate horizontal control necessary to identify the closest edge of an identified active fault trace.

(2) Buildings and structures subject to this chapter shall be required to set back 50 feet from the closest edge of an identified active fault as defined in SCC 30.91A.075.

(3) The building official may modify the fault setback requirements of this chapter only when done in accordance with SCC 30.50.126.

(Added Ord. 06-075, Oct. 4, 2006, Eff date Oct. 15, 2006; Amended Ord. 07-089, Sept. 5, 2007, Eff date Sept. 21, 2007; Amended by Ord. 11-022, Aug. 3, 2011, Eff date Aug. 18, 2011; Amended by Ord. 17-059, Oct. 18, 2017, Eff date Nov. 9, 2017)

30.51A.040 Additional information or tests authorized.

The building official may require an applicant to perform additional studies, tests, or site investigation to determine or confirm the specific location of an active fault trace and allow for optimal understanding of on-site and nearby seismic hazards, where needed to implement the requirements of SCC 30.51A.030 or section 11.8.3 of ASCE 7.

(Added Ord. 06-075, Oct. 4, 2006, Eff date Oct. 15, 2006; Amended Ord. 07-084, Sept. 5, 2007, Eff date Sept. 21, 2007; Amended by Ord. 11-022, Aug. 3, 2011, Eff date Aug. 18, 2011; Amended by Ord. 17-059, Oct. 18, 2017, Eff date Nov. 9, 2017)