Patterson Dam Valve Exercise 2020 (OM-DFD-2020-016)

Summary

SCH Number
2020110092
Lead Agency
Water Resources, Department of (California Department of Water Resources)
Document Title
Patterson Dam Valve Exercise 2020 (OM-DFD-2020-016)
Document Type
NOE - Notice of Exemption
Received
Posted
11/5/2020
Project Applicant
Division of Operations and Maintenance

Document Description
DWR will perform routine inspection on the Patterson Dam outlet works consists of butterfly valves (BFV) on the reservoir bottom leading to a steel conduit that conveys water to the outlet structure. To avoid a sudden release of water to the drainage ditch, the 12-inch diameter steel conduit between both valves will require dewatering. The volume of water between the valves is approximately 881 gallons. The cycling of both valves and dewatering will generate about 10 gallons per minute of flow. The entire project is within the DWR right of way.

Contact Information
Todd Percival
Department of Water Resources
1416 Ninth Street
Sacramento, CA 95814

Phone : (916) 653-2908
todd.percival@water.ca.gov

Location

Coordinates
37°41'51.36"N 121°41'3.93"W
Cities
Livermore
Counties
Alameda
Regions
San Francisco Bay Area
Cross Streets
Patterson Pass Rd and Greenville Rd
Other Information
Patterson Dam. Mile marker: SBA MM 9.36.

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. 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.

Attachments

Notice of Exemption
NOE Patterson_Valve_Exercise_OM_DFD-2020_016   PDF 421 K

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