Final Mitigated Negative Declaration and Response to Comments
Final Mitigated Negative Declaration and Response to Comments 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 44
would not increase as a result of the project. Therefore, the potential risk of affects to staff, contractors, or the public is considered to be less than significant. iv) As described in the Environmental Setting, portions of the proposed project area have potential for coherent landslides in the event of an earthquake in the Lake Tahoe Basin. This is an existing condition and the proposed project would not increase this potential hazard. Therefore, the potential risk of effects to staff, contractors, or the public is considered to be less than significant as a result of project implementation. b) Benthic barriers will be placed over the top of the underwater substrate in Emerald Bay. In addition, some portions of the project area may be treated with suction removal. The top 4- 8 inches of substrate would be filtered in place for clams, or the substrate may be suctioned onto a barge and returned clean to the same location after clam removal. Underwater AC control activities in Lake Tahoe require permits from the Army Corps of Engineers, Lahontan Regional Water Quality Control Board, Tahoe Regional Planning Agency, and the California Department of Fish and Game. All of these permits require monitoring and protective measures to ensure that project activities do not result in significant impacts to a water body. This action will not contribute to soil erosion and all necessary permits will be attained prior to commencing any project activities, resulting in less than significant impacts. c) Benthic barriers will be placed over the top of the underwater substrate in Emerald Bay. In addition, some portion of the project area may be treated with suction removal. These actions will not contribute to runoff or contribute to instability of soil. No impact. d) Expansive soils are those soils that have high clay content that swell when wet and shrink when dry. Soils on the project area site do not have high clay content, are therefore not expansive, and would not result in a substantial risk to life and property. No impact. e) The project does not involve the installation of any waste disposal systems. Therefore, there would be no impact to onsite soils from this project. f) There are no known unique paleontological or geological resources at the project site which could potentially be impacted by project activities. No impact. Asian Clam Control Project IS/MND Emerald Bay State Park California Department of Parks and Recreation 45
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would not increase as a result of the project. Therefore, the potential risk of affects <strong>to</strong><br />
staff, contrac<strong>to</strong>rs, or the public is considered <strong>to</strong> be less than significant.<br />
iv) As described in the Environmental Setting, portions of the proposed project area have<br />
potential for coherent l<strong>and</strong>slides in the event of an earthquake in the Lake Tahoe Basin.<br />
This is an existing condition <strong>and</strong> the proposed project would not increase this potential<br />
hazard. Therefore, the potential risk of effects <strong>to</strong> staff, contrac<strong>to</strong>rs, or the public is<br />
considered <strong>to</strong> be less than significant as a result of project implementation.<br />
b) Benthic barriers will be placed over the <strong>to</strong>p of the underwater substrate in Emerald Bay. In<br />
addition, some portions of the project area may be treated with suction removal. The <strong>to</strong>p 4-<br />
8 inches of substrate would be filtered in place for clams, or the substrate may be suctioned<br />
on<strong>to</strong> a barge <strong>and</strong> returned clean <strong>to</strong> the same location after clam removal. Underwater AC<br />
control activities in Lake Tahoe require permits from the Army Corps of Engineers,<br />
Lahontan Regional Water Quality Control Board, Tahoe Regional Planning Agency, <strong>and</strong> the<br />
California Department of Fish <strong>and</strong> Game. All of these permits require moni<strong>to</strong>ring <strong>and</strong><br />
protective measures <strong>to</strong> ensure that project activities do not result in significant impacts <strong>to</strong> a<br />
water body. This action will not contribute <strong>to</strong> soil erosion <strong>and</strong> all necessary permits will be<br />
attained prior <strong>to</strong> commencing any project activities, resulting in less than significant<br />
impacts.<br />
c) Benthic barriers will be placed over the <strong>to</strong>p of the underwater substrate in Emerald Bay. In<br />
addition, some portion of the project area may be treated with suction removal. These<br />
actions will not contribute <strong>to</strong> runoff or contribute <strong>to</strong> instability of soil. No impact.<br />
d) Expansive soils are those soils that have high clay content that swell when wet <strong>and</strong> shrink<br />
when dry. Soils on the project area site do not have high clay content, are therefore not<br />
expansive, <strong>and</strong> would not result in a substantial risk <strong>to</strong> life <strong>and</strong> property. No impact.<br />
e) The project does not involve the installation of any waste disposal systems. Therefore,<br />
there would be no impact <strong>to</strong> onsite soils from this project.<br />
f) There are no known unique paleon<strong>to</strong>logical or geological resources at the project site which<br />
could potentially be impacted by project activities. No impact.<br />
Asian Clam Control Project IS/MND<br />
Emerald Bay State Park<br />
California Department of Parks <strong>and</strong> Recreation<br />
45
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