Sutter Basin Flood Risk Management Project Cypress Ave to Tudor Rd.

US Army Corps of Engineers (USACE) Sutter Basin Project involved repairs to nearly five miles of critically deficient Feather River west levee between Tudor Road and Cypress Avenue in south Sutter County, California. Repairs included the installation of cutoff walls as deep as 135 feet into the existing levee. These improvements provide:

• 200-year flood protection

• Saving property owners money on flood insurance

• Avoiding land use restrictions

• Protecting property values

Great Lakes Environmental & Infrastructure was the Prime Contractor; Raito was selected as the cutoff wall subcontractor based on competitive pricing and extensive Northern California levee experience. Raito’s expertise includes over 2.3 million square feet of cutoff wall in Northern California with depths up to 135.

Project Highlights:

• DH808 Base Rigs with three auger motor

• Strength: UCS of 30 psi - 500 psi

• Maximum Permeability: 5 x 10 - 7cm/sec

• Minimum Wall Thickness: 24 inches

• Two Rigs working 12 hrs/day, 6 days/week