Bank Stabilization at Bridge No. 36-48, Hwy 9, PM 9.3

3 Documents in Project

Summary

SCH Number
2002082041
Lead Agency
California Department of Transportation, District 5
Document Title
Bank Stabilization at Bridge No. 36-48, Hwy 9, PM 9.3
Document Type
NOD - Notice of Determination
Received
Posted
9/24/2002

Document Description
This project is the more permanent solution. Work will include repair of the scoured southern bank for approximately 120-feet upstream of the bridge. The emergency work performed this past winter is inadequate as a permanent repair because it can only protect the bank up to moderate flows. The current project will place rock rip rap over filter fabric with a vegetative revetment (willow) that will extend up the southern bank to variable elevations. The total area of rip rap placement will be approximately 120-feet by 15-20 feet tapering to conform to the existing sandstone formation. The existing sack-concrete apron immediately under the south footing of the bridge is undermined and needs stabilization. In order to reduce potential impacts to steelhead, pre-cast concrete jacks will be lowered by crane and hand-placed below and adjacent to the sack- concrete apron. Once in place, the jacks should slow flow under the sack-concrete and facilitate the deposition of sediment within the jacks helping reduce further scour and stabilizing the footing. There is an existing gravel bar on the north side of the river immediately upstream of the Highway 9 Bridge that is believed to be the cause of the bank erosion. This bar was partially removed as part of the emergency work during the winter, and the removal of additional material is necssary to restore parallel flow through this section of the river. A crane operated from the bridge and an excavator on the gravel bar will be used to place the rip rap on the south bank. A front-end loader and crane will remove the material from the gravel bar will be used to place the rip rap on the south bank. A front-end loader and crane will remove the material from the gravel bar. The material will be trucked off-site to an appropriate disposal site.

Contact Information
Fred Botti
Department of Fish and Game
Lead/Public Agency
Central Coast Region
Yountville, CA 94599

Phone : (707) 944-5571

Location

Counties
Santa Cruz
Cross Streets
Mill Street
Total Acres
0.24
State Highways
9
Waterways
San Lorenzo River
Township
10S
Range
2W
Section
4
Other Location Info
Ben Lomond

Notice of Determination

Approving Agency
California Department of Fish and Game
Approving Agency Role
Responsible Agency
Approved On
Final Environmental Document Available at
50 Higuera Street San Luis Obispo, CA 93401

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.

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