(a)
Except as otherwise provided in subdivision (b), drawings and specifications submitted pursuant to this chapter for construction, reconstruction, remodeling, additions, or alterations which affect structural elements of structures in existence on January 1, 1986, shall be based upon an assessment of the geological conditions of the site and the potential for earthquake damage, relying upon geologic and engineering investigations and studies by personnel who are competent to report on geologic conditions and their potential for causing earthquake damage. One-story Type V and Type II
N construction of 4,000 square feet or less shall be exempt from this section, unless the project is within a special studies zone established pursuant to Section 2622 of the Public Resources Code.
(b)
The requirements of subdivision (a) may be waived by the enforcement agency if it determines that these requirements for the proposed essential services building project are unnecessary and would not be beneficial to the safety of the public.