VEN - 101 Culvert Replacement Project near la Conchita

Summary

SCH Number
2010078007
Lead Agency
Planning and Research, Office of (Office of Planning and Research)
Document Title
VEN - 101 Culvert Replacement Project near la Conchita
Document Type
NOE - Notice of Exemption
Received

Document Description
Permittee activities shall not exceed temporary impacts to more than 0.50 acres of ephemeral streambed. The two streams carried through the culverts to be replaced are ephemeral carrying seepage and seasonal flows during storm-related events captured from the adjacent steep mountain slopes above the community of La Conchita. The culverts will be replaced with larger (and wing walls and aprons will be reconstructed) to prevent storm-related overtopping should debris-flows occur; however no additional water flow will be directed to these culverts as part of the replacement project. The culvert inlets, and associated wing walls and aprons, are on the mountain side of US 101 within Union Pacific Railroad (UPRR) right-of-way, and just a short distance (bare ground) from the culverts for the UPRR. When reconstructed, the wing walls and aprons will join the existing UPRR culverts (the bare ground between culverts will remain). Culvert outfalls are on the armored (rip-rap) embankment on the ocean-side of US 101 (close to the mean high water line). During replacement of the culvert outfalls, the rip-rap will be removed and replaced in-kind (approximately 240 cubic yards (c.y.) within the existing footprint, 15' along bank (from edge of highway to the outfall), and 16' high). Culvert replacement is proposed for staged "cut-and-cover" construction from the roadway surface during the dry season ( no water diversion). Some temporary disturbance of bare ground in the flow line, and adjacent areas will be required to remove and replace the inlets, aprons, and wing walls. The culverts will be removed and replaced as follows: 1) excavation will occur to remove the existing wing walls, aprons, and culverts (approximately 2210 cy total for the two culverts; each approximately 200' long, 24' at base of channel, 40' across top of channel); 2) precast reinforced concrete box culverts will be set in place and backfilled (approximately 1410cy); 3) the highway roadbed and surface will be reconstructed above the culverts; and 4) wing walls and aprons will be reconstructed (cast-in place concrete), and will join the existing UPRR culverts.

Contact Information
Jamie Jackson
California Department of Fish and Game
South Coast Region 4949 Viewridge Avenue
San Diego, CA 92123

626-296-3430

Location

Counties
Ventura
Other Location Info
City of La Conchita

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
15301
Reasons for Exemption
Class 1 consists of the operation, repair, maintenance, permitting, leasing, licensing, or minor alteration of existing public or private structures, facilities, mechanical equipment or topographical features, involving negligible or no expansion of use beyond that existing at the time of the lead agency's determination.
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