Hell Hole Dam Core Raise Project
4 Documents in Project
Summary
SCH Number
2016052036
Lead Agency
Placer County Water Agency
Document Title
Hell Hole Dam Core Raise Project
Document Type
NOD - Notice of Determination
Received
Posted
7/22/2016
Present Land Use
Timberland
Document Description
At the request of the California Department of Safety of Dams (DSOD), PCWA Investigated the permeability of Hell Hole Dam above the impervious dam core in the event of a Probable Maximum Flood (PMF). The PMF is the theoretically largest flood resulting from a combination of the most severe meteorological and hydrologic conditions that could conceivably occur in a given area. Investigations identified that the PMF over tops the dam core for a distance fo approx. 700 feet adjacent to the left abutment and approx. 700 feet adjacent to the left abutments and approx. 700 feet adjacent to the right abutment. To meet DSOD and Federal Energy Regulatory Commission (FERC) requirements, PCWA is proposing to raise the dam core to ensure that seepage that could occur above the core under PMF loading is safely controlled.
Contact Information
Name
Jon Mattson
Agency Name
Placer County Water Agency
Contact Types
Lead/Public Agency
Address
Phone
Location
Counties
Placer
Cross Streets
Forest Rd 2 and Hell Hole Dam and Powerhouse Rd
Waterways
Hell Hole Reservoir, Rubicon River, NFLC Creek
Township
14N
Range
14E
Section
16
Other Location Info
Foresthill
Notice of Determination
Approving Agency
Placer County Water Agency
Approving Agency Role
Lead Agency
Approved On
Determinations
(1) The project will have a significant impact on the environment
No
(2a) An Environmental Impact Report was prepared for this project pursuant to the provisions of CEQA
No
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
Yes
(2c) An other document type was prepared for this project pursuant to the provisions of CEQA
No
(3) Mitigated measures were made a condition of the approval of the project
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
N/A
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
No
Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613.