Ulatis Flood Control Project: Emergency Sweeny Channel Scour Repair


SCH Number
Public Agency
Solano County Water Agency
Document Title
Ulatis Flood Control Project: Emergency Sweeny Channel Scour Repair
Document Type
NOE - Notice of Exemption
Document Description
During a recent maintenance inspection by the Solano County Water Agency (SCWA) it was discovered that existing rock slop protection for the channel under the Sweeney Creek railroad crossing, a feature of the Ulatis Flood Control Project, was displaced from under bridge leaving the foundation of bridge exposed to high flow scour. Staff is concerned with the potential for the situation to worsen if not adequately protected before significant storms occur. The current channel flow-line is lower than the elevation of the top of the bottom of the footing. Therefore, a minimal amount of additional scour could endanger the structure. SCWA is responsible for maintenance of the channel. To prevent further undermining of the channel bottom, SCWA will install rock cross-vanes immediately US and DS of the structure to arrest further degradation of the channel bottom under the structure. Rock backfill (RSP) will be replaced between the grade control features to mitigate for loss of bed material around the foundation and prevent further erosion. The cross vanes features will hold the RSP in-place to minimize future maintenance.

Contact Information

Chris Lee
Agency Name
Solano County Water Agency
Contact Types
Lead/Public Agency



Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Sec 15629(b)(c)
Reasons for Exemption
Emergency Project: Sec 21080(b)(4) The project falls under Section 15629 Emergency Projects, paragraph (b): Emergency repair to publicly or privately owned service facilities necessary to maintain service essential to the public health, safety, or welfare.

Disclaimer: The document was originally posted before CEQAnet had the capability to host attachments for the public. To obtain the original attachments for this document, please contact the lead agency at the contact information listed above. You may also contact the OPR via email at state.clearinghouse@opr.ca.gov or via phone at (916) 445-0613.

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