Fountaingrove Environmental Impact Report - City of Santa Rosa ...

2.0 LIST OF COMMENTERS AND RESPONSE TO COMMENTS
meet the performance standards. Because there are additional site exploration and analyses
to be performed during final project design, the City has identified specific alternative
mitigations to be incorporated, depending on the results of the findings. (Defend the Bay vs.
City of Irvine (2004) 119 Cal. App. 4th.) To clarify the purpose of the additional studies and
that the mitigation measures reduce impacts to a less than significant level, the mitigation
measures have been revised as follows.
Mitigation Measure 3.6-2: Incorporate site-specific seismic analysis into Project
design.
The site-specific seismic analyses will be performed to identify the active and
potentially active seismic sources that are capable of generating significant ground
shaking at the Project site. Analysis may include response spectra, computer
simulations, and finite element model. These findings will be incorporated into the
design of Project components prior to approval of the Improvement Plan. The project
components will be designed in accordance with the applicable building codes (2007
California Building Code) and will satisfy the seismic performance criteria of their
intended uses. Code requirements for structures located very near faults are more
complex than the requirements for structures located outside this region. For
structures located within the Project region, additional measures such as site-specific
geotechnical and geological investigations and additional structural analysis and
detailing are required. If the studies result in a significant redesign of the project,
then recirculation of the EIR may be required.
Mitigation Measure 3.6-3. Incorporate site-specific slope stability analysis into
Project design.
AdditionalThe site-specific investigations and analyses will be performed during
final design by the Applicant. The investigations will include drilling soil borings
and recovering soil samples within and outside the boundaries of the proposed
development site. The investigation will also include identification and
characterization of the horizontal and vertical (depth) extents of slope instability. The
findings will be incorporated in the analyses that will evaluate slope stability,
including landslides and soil creep, and various slope stability measures. Depending
on the findings, slope stabilization measures may consist of regrading slopes,
providing surface and subsurface drainages, and constructing slope strengthening
elements such as toe buttresses and secant walls. analyses will be performed and the
findings of the analyses The results of these studies may limit the proposed
development design, and they will be incorporated into the design of Project
components prior to approval of the Improvement Plan. If the studies result in a
significant redesign of the Project, then recirculation of the EIR may be required.
Mitigation Measure 3.6-4: Incorporate the results of geologic and geotechnical
investigations and site-specific seismic analysis into Project design.
As part of a design-level geologic and geotechnical investigations, site-specific
seismic and geologic hazard analyses will be performed to collect data and to assess
the potential for seismic-induced ground failure in soil and rock materials adjacent
to and underlying Project components. The study will include assessments of
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