As used in this chapter:
(a) "City" and "county" includes the City and County of San
(b) "Geotechnical report" means a report prepared by a certified
engineering geologist or a civil engineer practicing within the area
of his or her competence, which identifies seismic hazards and
recommends mitigation measures to reduce the risk of seismic hazard
to acceptable levels.
(c) "Mitigation" means those measures that are consistent with
established practice and that will reduce seismic risk to acceptable
(d) "Project" has the same meaning as in Chapter 7.5 (commencing
with Section 2621), except as follows:
(1) A single-family dwelling otherwise qualifying as a project may
be exempted by the city or county having jurisdiction of the
(2) "Project" does not include alterations or additions to any
structure within a seismic hazard zone which do not exceed either 50
percent of the value of the structure or 50 percent of the existing
floor area of the structure.
(e) "Commission" means the Seismic Safety Commission.
(f) "Board" means the State Mining and Geology Board.