Irish Canyon Culvert Repairs Project (Streambed Alteration Agreement No. EPIMS-CCA-30807-R3)
22 Documents in Project
Summary
SCH Number
2005092129
Lead Agency
Contra Costa County
Document Title
Irish Canyon Culvert Repairs Project (Streambed Alteration Agreement No. EPIMS-CCA-30807-R3)
Document Type
NOD - Notice of Determination
Received
Posted
8/21/2024
Document Description
The California Department of Fish and Wildlife (CDFW) has executed Lake and Streambed Alteration Agreement (EPIMS-CCA-30807-R3), pursuant to Fish and Game Code section 1602, to the project Applicant (East Contra Costa Habitat Conservation Agency, as represented by Abigail Fateman).
The project will replace two existing culverts (Culverts 101 and 102) under an unpaved dirt access road in the Irish Canyon Preserve. The two culverts are undersized and failing, causing the dirt access road to be undermined and at risk of failure. The culverts will be replaced and expanded to accommodate flows, and rock slope protection (RSP) will be placed to stabilize the inlets and outlets and maintain the road. No trees will be removed to complete the work. Following project activities, all disturbed areas will be restored and stabilized via appropriate erosion
control measures.
Culvert 101 will be replaced in kind (30-inch diameter by 20-foot-long) and a 2-foot-long by 7-foot-wide headwall will be installed at the upstream inlet. A 7-foot-long by 7-foot-wide tail wall/energy dissipator will be installed with RSP placed in a scour hole at the downstream outlet. A total of approximately 300 ft2 of RSP will be placed at the inlet and outlet. Culvert 102 will be upsized from 36-inch diameter by 14-foot-long to 36-inch diameter by 25-foot-long culvert. At the upstream end, the channel will be filled by 10 feet. This includes 5 feet length of the new edge of road and 5 feet of headwall length. The headwall will be 7 feet wide. At the downstream end, a 6-feet-long by 6-feet-wide tail wall/energy dissipator will be installed with RSP. A total of approximately 180 ft2 of RSP will be placed at the inlet and outlet.
Contact Information
Name
Sabrina Dunn
Agency Name
CA Department of Fish and Wildlife
Job Title
Environmental Scientist
Contact Types
Responsible Agency
Phone
Location
Cities
Clayton
Counties
Contra Costa
Regions
San Francisco Bay Area
Other Location Info
The project is located at two locations on Peacock Creek, in the Irish Canyon Preserve, in City of Clayton, County of Contra Costa, State of California; Latitude [37.935550], Longitude [-121.901859] and Latitude [37.935567], Longitude [-121.901859]; Assessor’s Parcel Number 075-200-008-0.
Notice of Determination
Approving Agency
CA Department of Fish and Wildlife
Approving Agency Role
Responsible Agency
Approved On
County Clerk
Contra Costa
Final Environmental Document Available at
The Final EIR prepared for the project is available to the general public at the office location listed above for the Lead Agency. CDFW’s record of project approval as a Responsible Agency is available at CDFW’s regional office.
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
Yes
(2b) A Mitigated or a Negative Declaration was prepared for this project pursuant to the provisions of CEQA
No
(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
Yes
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
Yes
Attachments
Notice of Determination
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