Final Mitigated Negative Declaration and Response to Comments

iv) Landslides?
b) Result in substantial soil erosion or the loss of
topsoil?
c) Be located on a geologic unit or soil that is unstable,
or that would become unstable, as a result of the
project and potentially result in on- or off-site
landslide, lateral spreading, subsidence,
liquefaction, or collapse?
d) Be located on expansive soil, as defined in
Table 18-1-B of the Uniform Building Code (1997),
creating substantial risks to life or property?
e) Have soils incapable of adequately supporting the use
of septic tanks or alternative waste disposal systems,
where sewers are not available for the disposal of
waste water?
f) Directly or indirectly destroy a unique
paleontological resource or site, or unique geologic
feature?
DISCUSSION
a) Seismic ground shaking is possible from earthquake events along the faults discussed
above in the Environmental Setting.
i) The Alquist-Priolo Earthquake Fault Zoning Act of 1972 was implemented to regulate
development near active faults and to prevent construction of buildings for human
occupancy on or near active faults (i.e., that have ruptured within the past 11,000
years). The designated zone extends from 200 to 500 feet on both sides of known
active fault traces. Under the Act, no buildings intended for human occupancy may be
constructed on or within fifty feet of an active fault trace. The project site is not located
within an Alquist-Priolo Earthquake Fault Zone as designated by the California
Geological Survey (CGS 2007). No structures that are designed for human occupancy
are located at the project site and no structures are proposed as part of this project.
Therefore, there is no expected adverse effect on people or structures with regard to
earthquake rupture as a result of implementation of this project. No impact.
ii) Seismic ground shaking may occur during an earthquake with an epicenter located in
the vicinity of Lake Tahoe. However, project activities will not increase the risk of
exposure of employees or contractors working in the forest and open space to a seismic
event. Therefore, the potential risk of effects to staff, contractors, or the public is
considered to be less than significant.
iii) Seismic-induced ground failure, such as liquefaction, usually occurs in unconsolidated
granular soils that are water saturated. During seismic-induced ground shaking, pore
water pressure in the soil could increase in loose soils, causing the soils to change from
a solid to a liquid state (liquefaction). Any potential for liquefaction in the project area
Asian Clam Control Project IS/MND
Emerald Bay State Park
California Department of Parks and Recreation
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