Natomas Levee Project

Natomas Levee project

Natomas Levee Project—U.S. Army Corps of Engineers (Update July 2019)

Goal:  Complete levee improvements started by SAFCA/State to provide Natomas Basin at least 200-year flood protection

Project Status:  Project is fully authorized by Congress (2014 Water Resources and Reform Development Act).  Appropriations are made on an annual basis

Cost Sharing Partners:       SAFCA (local) and Central Valley Flood Protection Board (State)

Operation and Maintenance Responsibility:  Reclamation District No. 1000

Construction Status:         See Construction Phasing Map

Reach A

i. USACE anticipates 65% design in July 2019, followed by 95% design in January 2020. Project Design Team is evaluating levee modification options for inclusion in 65% design and determining right of way needs to be included in Corps “take letter”.

Reach B

i. Contract award scheduled September 2019; construction in 2020-2021. 90% plans submitted December 2018; final bid plans by July 2019. Reach south of Radio Road will be bid as an option pending completion of right of way acquisition. Work includes the relocation of the NCMWC Riverside Canal and modifications to Plant 3 discharge pipes and removal of gravity drain. SAFCA is currently negotiating with several residents to purchase properties and has initiated condemnation actions where necessary. District has requested the design include a physical barrier between Garden Highway and top of proposed adjacent levee which the Corps has opined would be a “betterment”. District and SAFCA are making the case for inclusion as a project cost

ii. I-5 Window; Construction award scheduled January 2020 with construction in spring 2020. 65% plans to be complete by the end of May for submission to Caltrans for review; design proposed landside floodwall at the top of levee to avoid fill on freeway piers.

Reach C

i. No reportable items.

Reach D

i. Contract construction commenced in August 2018 with initial excavation for the proposed relocated Vestal Drain. Work resumed on Reach D the week of April 22nd. RD 1000 Staff will be attending weekly project meetings during construction. Mead and Hunt are reviewing information related to the Plant 4 reconstruction. Corps is pushing to complete reconstruction of Plant 4 by the end of 2019.

Reach E

i. USACE anticipates 35% design by mid-June, 2019, 65% design November 1, 90% in December, with construction award anticipated in the 3rd quarter of 2020. The work is being done by Corps staff outside Sacramento. They will be conducting a limited Value Engineering study of the 35% plans in late June.

Reach F

i. Anticipated Award 2022. Corps has prepared a draft hydraulic Basis of Design. Work is being done by Corps staff outside Sacramento

Reach G

i. Anticipated Award 2022. Corps has prepared a draft hydraulic Basis of Design. Work is being done by Corps staff outside Sacramento

Reach H

i. Contract awarded January 2019 to Inquip Associates Inc ($41.7 M). Construction 2019-2020. Proposed work includes levee de-grade for construction of slurry cutoff wall; slope flattening and landside access and patrol road.

ii. State DWR still working on real estate acquisitions for construction of landside access road.

iii. Inquip started drilling Monday (4/29), starting between San Juan and West El Camino. Removal of paved bike trail commenced the week of May 27.

iv. Materials will be laid down in the District provided staging areas just south of the Interstate 80 crossing of the Natomas East Main Drain Canal (NEMDC).

v. Inquip submitted a Fence Relocation Protocol for review by USACE. All proposals conform to the procedures discussed previously and seem to protect personal property and security of those residents living adjacent to the levee toe. District has been coordinating with SAFCA and the landowners on specific relocation issues. House at 200 Cleveland Avenue purchased by SAFCA to be removed.

vi. SAFCA is working with SMUD for relocation of the utility poles

Reach I

i. Contract 1 awarded 2018 to Inquip Associates Inc ($23.8 M). Work commenced December 2018 with relocation of bike trail under I-5. Relocation work on City water line commenced the week of May 20 with partial lane closures along Garden Highway under I-5. Work on the seepage blanket underneath the Interstate 5 overpass also begun 7/8/19 and should be completed in approximately 3 weeks time resulting in limited closure to Garden Highway.

ii. Slurry wall construction has begun between Northgate and Truxel as of 7/8/19 and is anticipated to be completed by 10/31/19. Garden Highway will be completed closed to traffic in that area for the duration of the construction work. 

iii. Contract 2 includes landside access road, slope flattening, and tree removals. Contract award scheduled 2021.