Chiles Pope Bridge Replacement (Notification of Lake or Streambed Alteration, No. EPIMS-NAP- 30757-R3)

3 Documents in Project

Summary

SCH Number
2021090076
Lead Agency
Napa County
Document Title
Chiles Pope Bridge Replacement (Notification of Lake or Streambed Alteration, No. EPIMS-NAP- 30757-R3)
Document Type
NOD - Notice of Determination
Received
Posted
7/20/2023
Document Description
The Project is limited to the replacement of an existing bridge structure. The new bridge will be longer than the existing bridge in order to widen the creek channel and eliminate constriction posed by the existing bridge. The new bridge structure will consist of an approximately 105-foot-long by 26-foot-wide two-span cast-in-place prestressed concrete slab bridge that is two feet in depth. Two new abutments will be installed. Abutments will consist of a seat-type abutment cap beam supported on soldier piles with ground anchors. One bent will be installed in the center of the channel to support the bridge, consisting of four 3-foot cast-in-place-drilled-hole shaft extensions. The Project will also install four new retaining walls. Pile installation for the retaining walls and abutments will be performed from the roadway. Excavation and installation of three retaining walls, abutment facing, and bent will be constructed from within the creek. A 30-foot-wide temporary access road into the creek will be created by grading the roadway approach and creek bank upstream of the existing bridge. A temporary stream diversion will be installed with cranes operated from the road and consist of an upstream cofferdam consisting of rock slope protection and sandbags, directing flow into two 24-inch diameter culverts that will extend 400 linear feet. The Project will result in temporary impacts to 0.22 acres and 450 linear feet of stream and riparian habitat from the temporary diversion of water and the installation of the temporary access road into the creek. The Project will result in permanent impacts to 239 square feet and 231 linear feet of stream and riparian habitat and will remove 24 riparian trees.

Contact Information

Name
Melanie Day
Agency Name
CDFW
Job Title
Senior Environmental Scientist, Supervisory
Contact Types
Responsible Agency

Location

Cities
unincorporated area
Counties
Napa
Regions
Northern California, San Francisco Bay Area
Other Location Info
The Project is located at Chiles Creek, a tributary to Lake Hennessey, and an unnamed tributary of Chiles Creek, along Chiles Pope Valley Road, in the County of Napa, State of California; Latitude 38.519085°N, Longitude 122.349143°W; Assessor’s Parcel Numbers: 025-440-003-000, 025-440-002-000, and 025-440-047-000.

Notice of Determination

Approving Agency
CDFW
Approving Agency Role
Responsible Agency
Approved On
County Clerk
Napa
Final Environmental Document Available at
2825 Cordelia Road, Suite 100 Fairfield, CA 94534

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
Yes
(4) A mitigation reporting or monitoring plan was adopted for this project
Yes
(5) A Statement of Overriding Considerations was adopted for this project
No
(6) Findings were made pursuant to the provisions of CEQA
No

Attachments

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