Upper Feather River (UFR) Dams Fault Exploration, Grizzly Valley Fault (GVF)
Summary
SCH Number
2023090317
Public Agency
California Department of Water Resources
(DWR)
Document Title
Upper Feather River (UFR) Dams Fault Exploration, Grizzly Valley Fault (GVF)
Document Type
NOE - Notice of Exemption
Received
Posted
9/14/2023
Document Description
To evaluate past tectonic activity that could influence dam safety at Lake Davis in the future. Up to two trench sites on the Grizzly Valley Fault (GVF) near Lake Davis on the Mt. Hough
Ranger District. Trenches will be approximately up to 100’ long by 30’ wide and up to 16’ deep. The trenches will be open for up to three weeks at each location. At the end of the
project, site will be restored to original conditions using the excavated spoils, straw, and native seed per Plumas Nation Forest direction. Trenches will be compacted using a backhoe
bucket. Some preliminary subsurface geologic exploration at the GVF sites will take place prior to excavation. A hand auger (2” to 4” diameter) will be used to dig a few feet into the
ground and then backfilled with the same soil. If conditions are difficult, a test pit measuring up to 4’x 4’x4’ will be dug by hand and shovel and backfilled with the same soil
Contact Information
Name
Hilary Garibay
Agency Name
DWR
Job Title
Senior Engineering Geologist
Contact Types
Lead/Public Agency
Phone
Location
Coordinates
Cities
Beckwourth
Counties
Plumas
Regions
Northern California
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
Class 4; Section 15304
Reasons for Exemption
Class 4 exemptions actions consisting of minor alterations to land including minor trenching and backfilling where the surface is restored. The goal of the
trenching is to evaluate past tectonic activity that could influence dam safety at Lake Davis in the future. The trenches will be open for up to three weeks at
each location. At the end of the project, site will be restored to original conditions using the excavated spoils, straw, and native seed per Plumas Nation
Forest direction
Attachments
Notice of Exemption
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