Buhman Avenue Bridge Replacement Project (Notification of Lake or Streambed Alteration, EPIMS Notification No. NAP-14743-R3)
Summary
SCH Number
2021090265
Public Agency
California Department of Fish and Wildlife, Bay Delta Region 3
(CDFW)
Document Title
Buhman Avenue Bridge Replacement Project (Notification of Lake or Streambed Alteration, EPIMS Notification No. NAP-14743-R3)
Document Type
NOE - Notice of Exemption
Received
Posted
9/15/2021
Document Description
The project is limited to replacing an approximately 49-foot-long culvert that was damaged during the 2014 South Napa earthquake. The existing culvert will be replaced with an approximately 50-foot-long, 8-foot-wide, and 8-foothigh reinforced concrete arch (RCA), open-bottom, cast-in-place culvert. In addition to installing the new RCA culvert, the existing concrete headwall at the culvert inlet will be replaced with a new concrete headwall and associated retaining walls will be constructed at the culvert outlet. The existing stone wingwall on the left bank immediately upstream of the existing culvert will be removed and approximately 35 cubic yards of 9-inch diameter (Class II) rock riprap will be placed on the left and right bank immediately upstream of the culvert inlet. At the culvert outlet, approximately 60 cubic yards of existing rock riprap will be reconfigured on the banks and bed of the channel
to provide bank stability and scour protection. The interstitial spaces within the rock riprap will be filled with native soil and planted with willows or other native species to provide bank stability and habitat. The new RCA culvert will provide approximately 3.4 feet of freeboard during a 100-year storm event.
The project will permanently impact 1,522 square feet (0.035 acres) of stream and riparian habitat. The project will temporarily impact 44 square feet of stream and riparian habitat due to removal of the existing culvert. Additionally, one split-trunk coast live oak (Quercus agrifolia), 14 and 16 inches in diameter at breast height (DBH), will be removed.
Contact Information
Name
Garrett Allen, Environmental Scientist
Agency Name
CDFW
Contact Types
Lead/Public Agency
Phone
Location
Cities
Napa
Counties
Napa
Regions
Northern California, San Francisco Bay Area
Other Location Info
The project is located at Congress Valley Creek in an unincorporated area of
Napa County, State of California; Latitude 38.28639, Longitude -122.33941. The nearest property address is 1286 Congress Valley Road, Napa, CA 94558. Specifically, the project occurs at the intersection of Buhman Avenue and
Congress Valley Road.
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15302, 15303.
Reasons for Exemption
The project consists of the replacement of existing structures and facilities where the new structure will be located on the same site as the structure replaced and will have substantially the same purpose and capacity as the structure replaced. The project also consists of construction and location of limited numbers of new, small facilities or structures.
County Clerk
Napa
Attachments
Notice of Exemption
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