Projects

Reclamation District 784 - Feather River Pump Station 3

MHM prepared the plans, special provisions, and estimates (PS&E) for the relocation of Pump Station No. 3 in conjunction with construction of a setback levee along the Feather River. Pump Station No. 3 is one of four major pump stations owned and operated by Reclamation District No. 784. The pump station consists of four 150 horsepower pumps.

The key features of the project include thirty (30) inch discharge pipes crossing a project levee. The Feather River Levee is part of the Sacramento River Flood Control System. All work will meet or exceed the U.S. Army Corps of Engineers Standards, the California State Reclamation Board Title 23 Standards, the Hydraulic Institute Standards, and the Uniform Building Code Standards.

The pump station also includes a low flow pump (40hp), a backup generator, SCADA, including redundant shut off gates and outfall structure, trash rack, and other features common to a regional pump station. MHM prepared the hydraulic and hydrology studies to reflect the changes to the drainage basin resulting from the new alignment of the setback levee which was necessary to properly size the pump station.

Levee District One - Lower Feather River Star Bend Setback Levee

The purpose of the Lower Feather River Star Bend Setback Levee Project was to improve flood protection for Levee District No. 1’s service area in the southern portion of the Sutter Basin, which includes portions of Yuba City, located 40 miles north of Sacramento, California.

The project consisted of constructing a new 3,400 lineal foot setback levee along the Feather River right bank (which replaced 6,600 lineal foot of existing levee). The proposed setback levee was designed to decrease the flood stages in the Feather River upstream and in the immediate vicinity of Star Bend by increasing the cross sectional area of the floodway and to replace a levee section with historic problems with a new levee constructed in accordance with the latest standards of the U.S. Army Corps of Engineers (USACE) and the California Central Valley Flood Protection Board (CVFPB). The setback levee was designed to provide flood protection against a flood event with a 0.5 percent chance of occurrence in any given year (also referred to as a 200 year storm event).

The project involved the installation of approximately 3,350 lineal feet of soil-bentonite cutoff wall (to a depth of approx 65 feet below the top of the levee or elevation 3.0 NVGD 29) and 650 lineal feet of soil-cement-bentonite cutoff wall (to a depth of approximately 87 feet below the top of levee or elevation -20.0 NVGD 29). The setback levee embankment is comprised of a twenty (20) foot crown and 3H:1V side slopes. The height of the levee is approximately twenty five (25) feet above the adjacent ground.

Existing irrigation facilities in the area of Star Bend also required relocation as part of the project, and the project included three new pipelines through the new levee and connection to previously installed facilities. These pipelines included one eighteen (18) inch and two thirty (30) inch diameter welded steel pipelines constructed through the levee and at a height above the 200 year water surface elevation or the 1957 water surface profile, whichever is higher.

The new embankment construction also required the relocation of an existing relief well pumping station located at the north end of the project. A new pump station sump structure was constructed outside of the footprint of the new levee and existing mechanical and electrical equipment was installed at the new facility.

Caltrans District 3 Headquarters

Caltrans District 3 in conjunction with the Department of General services constructed a new 5 story regional headquarters designed to house 776 employees, with a 200 seat auditorium , teleconferencing rooms, and more in an over 200,000 sq-ft building with and over 350 onsite parking spaces.MHM was the Civil engineer for the design build team.

Prior to site design, MHM performed a topographic survey of the existing site improvements and utilities and verified the site boundary. MHM also performed civil design services for the entire site that was on the existing headquarters site that had to remain operational during construction. The site improvements included grading, drainage, sanitary sewer, domestic water and dry utilities.

MHM provided construction support, construction staking for the project and as-built verification surveys of the installed improvements. The offsite improvements included the relocation of the major utility infrastructure that ran through the footprint of the new building. The utilities that had to be relocated were: sewer, water, storm drainage, gas, power, telephone, cable, and a Caltrans interconnection line. When these utilities were all rerouted around the site they also had to be upgraded to serve the new structure. An offsite parking lot for state vehicles also was designed and constructed as part of the project.

Yuba City Unified School District - Butte Vista Elementary School

MHM provided services for the reconstruction of the entire Butte Vista Elementary School site. This included topographic and boundary survey of the site prior to any work. Since the school site was an operational site, numerous buildings were located onsite. A detailed survey of the existing utilities was performed.

MHM performed civil design services for the site reconstruction. The work included grading, drainage, sanitary sewer, domestic water and dry utilities. The site improvements also included pavement delineation, security lighting and the track and field layout. All work was performed in accordance with the state Architects office. ADA requirements were addressed throughout the site.

MHM provided construction support and construction control survey. MHM prepared Plans, Special Provisions and estimates for the offisite roadway improvements. The work included drainage, sanitary sewer, water, sidewalk, and roadway improvements

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