SFPUC Alameda Siphons Seismic Reliability Upgrade Project
3 Documents in Project
Summary
SCH Number
2008022072
Lead Agency
City and County of San Francisco
Document Title
SFPUC Alameda Siphons Seismic Reliability Upgrade Project
Document Type
NOD - Notice of Determination
Received
Posted
1/14/2009
Document Description
The SFPUC proposes to construct a new Alameda Siphon and Seismically upgrade existing facilities in the vicinity of three existing Alameda Siphons in Alameda County. The existing Alameda Siphons are underground pipelines that traverse the Sunol Valley. These pipelines convey Hetch Hetchy water delivered by the Coast Range Tunnel and water from the Alameda Creek Watershed from the Calaveras and San Antonio Reservoirs to customers in Sunol Valley, and connect to the Irvington Tunnel. The three existing Alameda Siphons cross the Calaveras Fault and have a high probablity of failure (and significant damage) in a major seismic event from fault movement. The propsed Alameda Siphon No. 4 would cross the Calaveras Fault at an angle and use modern engineering methods to make it more resistant to earthquake damage compared to the three existing siphons, which cross this fault perpendicularyly and were not constructed with the modern engineering methods available today. The proposed new siphon would be interconnected with the existing siphons at a mixing manifoldjust east of the Alameda West Portal (not directly connected to the existing Irvington Tunnel) in a manner that would allow the SFPUC to shut down any combination of the siphons while allowing others to remain in service so that regular inspections and maintenance can occur. The CA DFG is executing a Lake and Streambed Alteration Agreement No. 1600-2008-0262-3 pursuant to Section 1602 of the Fish and Game Code to the project Applicant, Annie Li, SF Public Utilities Commission
Contact Information
Name
Timothy Johnston
Agency Name
California Department of Fish and Game
Contact Types
Lead/Public Agency
Phone
Location
Counties
Alameda
Cross Streets
Calaveras Road south of Highway 680
Zip
94586
Parcel #
096-0080-006, 007, 008, 009
State Highways
680
Railways
UPRR
Waterways
Alameda Creek
Township
3S
Range
1E
Base
MDB&M
Other Location Info
City/Nearest Community: Sunol
Notice of Determination
Approving Agency
CDFG
Approving Agency Role
Responsible Agency
Approved On
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
N/A
(4) A mitigation reporting or monitoring plan was adopted for this project
N/A
(5) A Statement of Overriding Considerations was adopted for this project
N/A
(6) Findings were made pursuant to the provisions of CEQA
N/A
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.