Ives Park, Calder Creek Emergency Storm Drain Repair
Summary
SCH Number
2025090009
Public Agency
City of Sebastopol
Document Title
Ives Park, Calder Creek Emergency Storm Drain Repair
Document Type
NOE - Notice of Exemption
Received
Posted
9/2/2025
Document Description
On April 25, 2025, a large sinkhole was found in an asphalt pathway that crosses Calder Creek in Ives Park. Upon examination, it was found that the structure of the base of the large 60"x 30' corrugated metal pipe (CMP) was compromised. This caused the fill and soil beneath the pipe to wash down the Creek and the fill above the pipe to slip into the void which resulted in unsupported asphalt in the pathway. The CMP that needs repair is directly in line with the flow of Caulder Creek. The sink hole was determined to be a risk for public safety and covered with large steel plates. Due to the urgency of the situation, a subcontractor was retained to perform a trenchless rehab of the CMP. The repair would consist of a cinderblock wall to keep the water held upstream with two 8" diversion pipes. Once the CMP is a dry environment, the repair to the floor of the CMP began. Shortly after, the work was stopped due to the concern of working with concrete in the waterway. As a result, Visqueen sheeting held with sandbags placed in the creek to keep the water from making contact with the cinderblock wall and cement. Water samples were taken upstream and below the diversion pipes to determine the levels of pH. Engineered plans and specs.
Contact Information
Name
Elissa Overton
Agency Name
City of Sebastopol
Job Title
Engineering Technician
Contact Types
Lead/Public Agency
Phone
Location
Coordinates
Cities
Sebastopol
Counties
Sonoma
Regions
Citywide
Cross Streets
Willow Street, High Street, Jewell Ave
Zip
95472
Total Acres
.0113
Jobs
3
Parcel #
004-201-026
State Highways
Hwy 116, Hwy 12
Schools
7. See "Other" below
Waterways
Calder Creek, Laguna de Santa Rosa, Zimpher Creek
Township
T6N
Range
R9W
Section
12
Base
MDM
Notice of Exemption
Exempt Status
Emergency Project
Type, Section or Code
Sec. 21080(b)(4); 15269(b)(c)
Reasons for Exemption
The Project qualifies under 15269. Emergency Projects (b) and (c). Environmental review did not identify any significant effects resulting from the Project, and the exceptions listed in Section 15300.2 of the CEQA Guidelines were found not to apply.
County Clerk
Sonoma
Attachments
Notice of Exemption
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