Castaic Underdrain Cleaning


SCH Number
Public Agency
California Department of Water Resources (DWR)
Document Title
Castaic Underdrain Cleaning
Document Type
NOE - Notice of Exemption
Document Description
A contractor will clean and inspect the underdrain pipes in the Castaic Dam spillway. An onsite hydrant will be used as a water source. The waste (water and solids) produced from the cleaning process will be pumped out of the underdrain gallery into temporary onsite storage tanks before being pumped into a vac truck. The vac truck will filter out solids as small as 100 microns from the captured water. The remaining cleaned water will be discharged into a temporary settlement pond located at the downstream end of the spillway. The settlement pond will be an added precaution for the final discharge water that will percolate and evaporate from this settlement pond. The staging area will be the access area to the underdrains at the bottom of the spillway. All work is within DWR right of way.

Contact Information

Todd Percival
Agency Name
Department of Water Resources
Contact Types
Lead/Public Agency

Agency Name
Division of Operations and Maintenance
Contact Types
Project Applicant


Santa Clarita
Los Angeles
Southern California
Cross Streets
Lake Hughes Road and Ridge Rte. Road

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
Class 1, Existing Facilities, Section No. 15301(b)
Reasons for Exemption
The State Water Project provides significant and important services to many Californians. This project is exempt because it involves routine maintenance activities for a safe water supply. This project will not result in impacts to special status species or habitat. Because this activity can be implemented without any significant environmental impacts, the Categorical Exemption Class 1 will be used for CEQA compliance.


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