System Protection at Kohler and Sonoma Creek Crossings (California Endangered Species Act (CESA) Incidental Take Permit No. 2081-2024-026-03 (ITP))
4 Documents in Project
Summary
SCH Number
2023070286
Lead Agency
Sonoma County Water Agency
Document Title
System Protection at Kohler and Sonoma Creek Crossings (California Endangered Species Act (CESA) Incidental Take Permit No. 2081-2024-026-03 (ITP))
Document Type
NOD - Notice of Determination
Received
Posted
4/18/2025
Document Description
The Project is designed to protect Sonoma Valley County Sanitation District’s (SVCSD) existing underground sanitary sewer collection pipelines that service the Glen Ellen area and convey sewage to the SVCSD treatment plant; specifically, a 16-inch diameter main sewer trunk line that crosses Kohler Creek and a 6-inch diameter lateral sewer pipeline that crosses Sonoma Creek. The pipelines and their associated concrete casings which cross the creek beds have become exposed due to scour, requiring protection to prevent them from failure. The Project includes permanent repairs along Kohler and Sonoma creeks using a combination of rock slope protection, fabric reinforced fill structures built with biodegradable fabrics, log rootwad revetments, brush mattresses, and native vegetation. In addition, the pipeline across Sonoma Creek will be armored in its current location with large boulders. The Project will also include revegetation with native plants and installation of habitat improvement elements for aquatic species in Sonoma Creek. Construction within the dewatered portion of Sonoma Creek will be completed within one season from June 15 through October 15. Project staging will occur in uplands on-site. Access will occur along an existing driveway off Arnold Drive.
The Project will result in impacts to 290 linear feet (0.36 acres) of California freshwater shrimp (Syncaris pacifica) aquatic habitat including temporary impacts to 270 linear feet (0.35 acres) from dewatering; the Project will permanently remove 20 linear feet (0.01 acres) of California freshwater shrimp aquatic habitat. The Project will also result in temporary impacts to 210 linear feet (0.04 acres) of California freshwater shrimp habitat located above the wetted portion of Sonoma Creek during Project construction, within the same length of stream that will be dewatered. The Project is expected to result in incidental take of California freshwater shrimp, which is designated as an endangered 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
James Hansen
Agency Name
CA Department of Fish and Wildlife
Job Title
Environmental Scientist
Contact Types
Responsible Agency
Phone
Name
David Cook
Agency Name
Sonoma County Water Agency
Job Title
Lead Agency Contact
Contact Types
Lead/Public Agency
Phone
Email
Location
Coordinates
Cities
Glen Ellen
Counties
Sonoma
Regions
San Francisco Bay Area
Township
6N
Range
6W
Section
16
Other Location Info
The System Protection at Kohler and Sonoma Creek Crossings (Project) is located along Kohler Creek and Sonoma Creek, at 13965 Arnold Drive, within the Town of Glen Ellen, Sonoma County. The Project is located approximately 400 feet north of the intersection of Arnold Drive and Hill Road at approximately 38.359021°N, -122.525079°W. The Project site is bounded by Arnold Drive to the west, residential development to the east, and Sonoma Creek to the north and south. The Project is located within the Glen Ellen U.S. Geological Survey 7.5 Minute topographic quadrangle map and in Section 16 of Township 6 North, Range 6 West.
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 Mitigated 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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