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

4.0 MITIGATION MONITORING AND REPORTING PROGRAM
TABLE 4-1
Mitigation Monitoring and Reporting Program
Documentation
Additional Permit
Enforcement
Implementation
Schedule
Impacts Mitigation Measures Responsible
Party
of regrading slopes, providing surface and subsurface
drainages, and constructing slope strengthening elements
such as toe buttresses and secant walls. 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.
review of the Giblin analysis by Kleinfelder concluded that the analysis was acceptable for a
preliminary evaluation and for assessing overall geotechnical feasibility of landslide mitigation
and project development. Supplemental recommendations for site preparation, grading and
foundation design criteria should be provided based on the results of additional site
exploration and analysis of the conditions encountered.
N/A Design-level Geologic and Geotechnical
Investigation Report.
During
development of
plans and
specifications.
City of Santa
Rosa
Department of
Community
Development
Mitigation Measure 3.6-4: Incorporate the results of
geologic and geotechnical investigations and
site-specific seismic analysis into Project design.
Impact 3.6-4: The Project could result in exposure of people or structures to loss, injury, or
death due to liquefaction and other forms of seismic-induced ground failure, including seismic
slope instability and ground cracking.
Revised plans and specifications.
Prior to approval
of the
Improvement
Plan.
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
seismic-induced geologic hazard potential at the project
site, such as liquefaction, slope failure during
earthquakes, and loss of bearing capacity of foundation
soils. If such potentially problematic soils and/or slopes
are found, the effects of these seismic-induced geologic
hazards to the performance of Project components will be
evaluated and incorporated into the design.
Seismic-induced ground failure has the potential to distress, displace, and/or destroy Project
buildings and facilities. Portions of the Project site that are susceptible to slope instability
hazards may also be susceptible to slope failure as a result of strong seismic ground shaking.
Prior to issuance
of building
permits.
Mitigation measures may include excavation of potentially
liquefiable soils during construction and replacement with
engineered backfill, in situ ground treatment (such as
compaction grouting, deep soil mixing, and jet grouting) to
prevent occurrence of liquefaction and loss of soil
bearing, construction of perimeter system to contain the
problematic soils, and strengthening slopes using toe
buttresses and secant walls. Potential slope failure within
and outside the boundaries of the proposed development
site that may impact Project components will be
assessed. Portions of the Project site that are susceptible
to slope instability hazards are likely to be susceptible to
slope failure as a result of strong seismic ground shaking.
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.
Impact 3.6-5: The Project may include development on soft, loose, expansive, and/or Mitigation Measure 3.6-5: Develop appropriate design City of Santa During
N/A Design-level Geologic and Geotechnical
compressible soils that creates substantial risks to life or property.
features for locations where potential problems have Rosa
development of
Investigation Report.
been identified through design-level geotechnical Department of plans and
Soft or loose soils may affect support of structures and excavations. Shrink/swell, or
investigations.
Community specifications
Revised plans and specifications.
expansive-soil, behavior is a condition in which soil reacts to changes in moisture content by
Development
expanding or contracting. Much of the existing fill identified within the Project site has high Design-level geotechnical studies will be conducted to
Before thePrior
clay contents with moderate expansion potential. Expansive soils may cause differential and develop appropriate design features for locations where Project Applicant to approval of
cyclical foundation movements that can cause damage and/or distress to overlying structures potential problems are known to exist. If potentially
the Improvement
and equipment. Potential impacts from loose sands, soft clays, and other potentially
problematic soils are found, appropriate design measures
Plan.
compressible soils include excessive settlement and low foundation-bearing capacity for may include excavation of such soils during construction
Project buildings and facilities.
and replacement with engineered backfill, ground
Prior to issuance
of building
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