Post-Storm Dam 5 Emergency Sediment and Debris Removal Activities Project NOE
1 Documents in Project
Summary
SCH Number
2021110427
Public Agency
State Water Resources Control Board
Document Title
Post-Storm Dam 5 Emergency Sediment and Debris Removal Activities Project NOE
Document Type
NOE - Notice of Exemption
Received
Posted
11/29/2021
Document Description
Due to wildfires and heavy precipitation events, a large volume of sediment has
migrated into the Dam 5 impoundment. SCE is concerned that continuing accumulation of sediment could cause a collapse of the dams’ intake gates. To avoid
this collapse, SCE proposes mechanical removal of the sediment. To access the Dam 5 impoundment, SCE will draw down the Dam 5 reservoir using thelow-level outlets. Additionally, SCE will expand the existing access road ramp by
approximately 20 feet. The expanded access road will be constructed using up to
200 cubic yards of crushed rock to create a drivable surface. The expanded access
road will be left in place after Project completion. A temporary bypass channel will be
constructed out of two side-by-side 48-inch-diameter culverts to allow flows to bypass
the construction area. SCE will remove approximately 2,000 cubic yards of sediment located adjacent to the Dam 5 intake structure and directly upstream of the Big Creek Powerhouse No.2. The Project will result in no more than 3.24 acres of temporary impacts to the Dam 5 reservoir. Once sediment removal is complete, the ramp and culverts and all imported earthen support materials will be removed. Only the permanent rock fill for the base of the extended access road will remain in place.
Contact Information
Name
Philip Meyer
Agency Name
State Water Resources Control Board
Job Title
Environmental Scientist
Contact Types
Lead/Public Agency
Address
Phone
Location
Cities
big creek
Counties
Fresno
Regions
Citywide, Countywide, Statewide, Unincorporated
Other Location Info
Big Creek Hydropower Facilities, Big Creek, CA 93605
Notice of Exemption
Exempt Status
Emergency Project
Type, Section or Code
Sec. 21080(b)(4); 15269(b)(c)
Reasons for Exemption
The Project qualifies for an exemption as an Emergency Project under California Code of Regulations Section 15269 (b)(c) because sediment removal from the Dam 5 impoundment is planned to prevent the dam's intake gates collapsing, and helping to ensure that essential service will not be interrupted.
County Clerk
Fresno
Attachments
Notice of Exemption
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