No new building shall be constructed in the C-R-PD zone unless the construction of such new building complies with the following requirements:
   A.   A licensed geologist provided by the owner and directed by the city shall determine whether any transverse geologic fault is present on the site where the new building is proposed. Such determination shall be made by one or both of the following methods:
      1.   Observation and evaluation of one east-west and one north- south trench to be temporarily constructed in conformance with the standards specified by the California division of mines and geology; and/or
      2.   Observation of site excavation work combined with an evaluation of soil samples from not less than three (3) drill locations.
Should a fault be identified, then a report of the geologist shall specify appropriate mitigation measures to be implemented with the approval of the department of building and safety.
   B.   Foundations shall be placed below a depth of thirty feet (30'), unless an alternate foundation design which will provide equivalent protection against liquefaction impacts is approved by the department of building and safety.
   C.   In the event that excavation, other than that required for geotechnical testing pursuant to subsection A of this section, is necessary for the construction of a project, the excavation design shall provide for support of the vertical slopes of the excavation to minimize lateral movement by a system of soldier piles and lagging or other engineered system designed to minimize lateral movement. (Ord. 92-O-2150, eff. 9-11-1992)