Chadd Creek Culvert, Sediment Removal for Flow Capacity Maintenance
Summary
SCH Number
2012058115
Public Agency
Regional Water Quality Control Board, Region 1 (North Coast), Santa Rosa
Document Title
Chadd Creek Culvert, Sediment Removal for Flow Capacity Maintenance
Document Type
NOE - Notice of Exemption
Received
Posted
5/10/2012
Document Description
The Applicant maintains a cast-concrete culvert where Holmes Flat Road crosses Chadd Creek near the intersection with Avenue of the Giants. The upper watershed is in steep terrain that is prone to landslides. Landslide material and debris washes downstream during winter highflow events and significant amounts of sediment are deposited throughout the lower reach of the channel where the stream channel gradient and flow velocities diminish. The channel aggradation causes a significant reduction in flow capacity through the culvert which neccessitates periodic sediment removal to maintain flow capacity during the winter to assure unrestricted access to the residents of Holmes Flat as well as access for emergency services.
An area approximately 45-feet long by 16-feet wide will be excavated upstream of the culvert and an area approximately 30-feet long by 16-feet wide will be excavated downstream of the culvert.
Contact Information
Name
Dean Prat
Agency Name
Regional Water Quality Control Board, Region 1 (North Coast), Sa
Contact Types
Lead/Public Agency
Phone
Location
Counties
Humboldt
Other Location Info
near Redcrest
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15301
Reasons for Exemption
The project consists of maintanance of existing facilities involving no expansion of an existing use.
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