Llano Trunk Pipeline Rehabilitation (California Endangered Species Act (CESA) Incidental Take Permit No. 2081-2024-049-03 (ITP))
3 Documents in Project
Summary
SCH Number
2025020412
Lead Agency
City of Santa Rosa
Document Title
Llano Trunk Pipeline Rehabilitation (California Endangered Species Act (CESA) Incidental Take Permit No. 2081-2024-049-03 (ITP))
Document Type
NOD - Notice of Determination
Received
Posted
6/6/2025
Document Description
This Project involves the rehabilitation of 8,170 linear feet of reinforced concrete pipe trunk sewer main. The existing underground 66-inch diameter sewer main pipeline is within a City of Santa Rosa-owned easement that spans the entire length of the Project. The trunk sewer main will be rehabilitated using trenchless cured-in-place pipelining technology, which consists of internally inspecting the pipeline via a closed-circuit television feed mounted on a “pig” within the pipeline, cleaning the interior of the pipe, and applying a sealant, fabric liner, and epoxy coat. The trenchless cured-in place pipeline technology will require excavation at thirteen sewer manholes ranging from 25 to 36 square feet with a depth of 4 to 6 feet. One manhole rehabilitation site is located within a seasonal wetland and will not require excavation.
The Project will also include an above-ground temporary sewer bypass system for the duration of the Project. The temporary bypass pipeline consists of three 18-inch diameter pipes to maintain peak sewer function while the sewer main pipeline is being repaired. The temporary bypass pipeline will be connected to the sewer main via openings in one upstream and one downstream manhole. The temporary bypass pipeline will be removed after the completion of the sewer main repairs. The Project will be completed in one construction season.
High Impact Areas include the primary egress and ingress routes, staging and stockpiling locations, liner launch points, non-excavation work areas requiring more extensive vehicle and equipment access, manhole rehabilitation and excavation areas, and the bypass suction and reinsertion locations. The High Impact Areas comprise 1.17 acres.
Low Impact Areas include the portions of the Project where activity will be limited to foot traffic and no more than 30 one-way vehicle trips throughout the course of the Project. The primary work in these areas will include installation of the bypass pipe and liner termination points. Liner termination is done underground inside existing manholes. The bypass pipe will be propped up on wooden blocks every 50 feet within the Low Impact Areas. In addition, steel plates will be placed over drainages for access and plastic or wooden mats will be placed over wetland habitat within the Low Impact Areas to avoid soil rutting and crushing vegetation from vehicle traffic. The Low Impact Areas comprise 3.09 acres.
The Project site also includes 0.37 acre of developed land and 0.01 acre where the bypass pipeline will free span a wetland and no impacts to the wetland will occur.
The Project will result in temporary impacts to 1.17 acres of California tiger salamander habitat. The Project is expected to result in incidental take of California tiger salamander, which is designated as a threatened species under CESA. The ITP referenced above as issued by CDFW authorizes incidental take of species listed under CESA that may occur as a result of Project implementation.
Contact Information
Name
Nick Wagner
Agency Name
CA Dept of Fish and Wildlife
Job Title
Senior Environmental Scientist (Specialist)
Contact Types
Responsible Agency
Phone
Name
Richela Maeda
Agency Name
City of Santa Rosa
Job Title
Lead Agency Contact
Contact Types
Lead/Public Agency
Phone
Email
Location
Cities
Santa Rosa
Counties
Sonoma
Regions
San Francisco Bay Area
Other Location Info
The Llano Trunk Pipeline Rehabilitation Project (Project) is a linear project that is approximately 1.74-miles long and located within a City of Santa Rosa-owned easement along Llano Road, beginning approximately 0.4 miles north of Todd Road and terminating at the Laguna Treatment Plant, within the City of Santa Rosa and unincorporated Sonoma County from approximate GPS coordinates 38.39019°N, 122.7744°W on the northern end of the Project to 38.36946°N, 122.76515°W on the southern end of the Project. The Project site is bounded by the following conservation areas for California tiger salamander (Ambystoma californiense):
• Santa Rosa Plain Vernal Pool Ecological Reserve, west of the northern end of the Project
• Hale Mitigation Bank, east of the northern end of the Project
• Carinalli-Todd Road Mitigation Bank, west of the approximate mid-point of the Project
The Project is further bounded by undeveloped land and rural residences to the north, west, and south, and the Laguna Treatment Plant to the south. The Project footprint is 4.64 acres and located on the following Assessor’s Parcel Numbers:
• 060-060-051
• 060-060-053
• 060-060-030
• 063-180-001
• 063-180-025
• 063-180-033
• 063-180-036
• 063-180-040
• 063-180-042
• 063-180-045
• 063-180-046
• 062-240-025
The Project is within Township 6N, Range 8W, Sections 5, 8, and 17 of the Sebastopol and Two Rock U.S. Geological Survey 7.5-minute quadrangle maps.
Notice of Determination
Approving Agency
CA Department of Fish and Wildlife
Approving Agency Role
Responsible Agency
Approved On
County Clerk
Sonoma
Final Environmental Document Available at
The Negative Declaration prepared by the lead agency for the Project is available to the general public at the office location listed above for the lead agency. CDFW’s administrative record of proceedings related to the incidental take permit is available to the public for review 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
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
Yes
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
No
Attachments
Notice of Determination
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