Facility Planning & Design

Project

Willey Restoration Project
Sacramento County, California

West Yost under contract to an environmental services firm, provided engineering design and construction period  services for converting 217 acres of rice farmland into a wetlands and endangered giant garter snake habitat. The wetland will rely on two water sources: agricultural delivery and an onsite supplemental groundwater well.

Project

Soscol Gateway Interior Drainage Improvement
City of Napa, California

West Yost reviewed previously prepared technical studies and schematic-level designs of two design alternatives to handle overland drainage in the Soscol Gateway area of Napa. Following this review, West Yost developed an alternative drainage plan that had an estimated cost of about $6.4 million, nearly a 50% cost savings from the previously developed project (at about $12 million). In addition, the performance of this alternative, low cost approach was verified as better than the performance of the previous plan.

Project

Newcastle Road and North Little Johns Creek Stormwater Pump Station
Stockton, California

West Yost designed a stormwater pump station serving the Opus Logistics Center in east Stockton. The project consists of the construction of a below grade stormwater pump station with a rated capacity of 44 cfs.

Project

Design of Storm Drain Basin, Pump Station, and Box Culverts
City of Manteca, California

West Yost prepared a Storm Drain Master Plan for the City and subsequently prepared the predesign and design of a detention basin, pump station, and box culvert. The 16 ac-ft detention basin included a 4 cfs pump station and nearby irrigated landscape and hardscape. Design also incuded 1,500 feet of a 3 feet by 12 feet box culvert, and 1,100 feet of a 3 feet by 8 feet box culvert with associated sewer relocations.

Project

Design and CM for Valley Glen Stormwater Pump Station
City of Dixon, California

West Yost performed a master drainage study for the City and subsequently assisted the City in designing and constructing a number of infrastructure projects including the Valley Glen Stormwater Pump Station. The 156 cfs stormwater pump station included trench style concrete wetwell, mechanical “flexrake” trash rack, four propeller duty pumps with low speed motors, and one low flow pump. 

Project

Storm Drain Master Plan, Infrastructure Planning and Design
City of Dixon, California

West Yost performed a master drainage study for the City with complete review and analysis of applicable hydrologic models and development of a recommended Capital Improvement Program. West Yost also provided planning and design services for storm drainage infrastructure including detention ponds and pumping stations.

Project

Pleasants Valley Regional Detention Facilities
City of Vacaville, California

West Yost provided a feasibility study, predesign, and final design for two regional detention facilities to reduce flooding in the City. This project included two basins located on either side of Encinosa Creek (tributary to Alamo Creek). The recommended detention basins have a combined detention storage capacity of 200 acre-feet.

Project

On-Call Modeling & Setterquist Park Design
Vallejo Sanitation & Flood Control District

After preparing the VSFCD Flood Control Master Plan, West Yost provided on-call modeling and design services on serveral projects for the District. This included preparing the design of a headwall, trash rack, and access road for an open channel within Setterquist Park, reviewing a Caltrans plan to enlarge three culverts under I-80, and developing a low-cost storm drainage improvement plan to address increased flows through the Caltrans culverts.

Project

Homeacres Drainage Improvements
Vallejo Sanitation & Flood Control District

West Yost prepared the design of Phase 1 of the Homeacres Drainage Improvements. These projects included design of 18-inch to 30-inch storm drains through areas congested with other existing underground utilities, a 48-inch storm drain, and a tailwall and velocity/energy dissipater section of riprap. The project included design of an earth berm 3 feet high and a headwall/drain inlet and curb and gutter at several locations.

Project

Lemon Street Flood Control Predesign and Design
Vallejo Sanitation & Flood Control District

West Yost prepare a detailed design and specifications for flood control improvements to address flooding following a December storm event. The project involved addressing changes within the watershed since the District’s Storm Drainage Master Plan was prepared. West Yost developed updated modeling which closely reproduced the actual flooding observed from the December storm, and conducted a detailed evaluation of alternatives, resulting in recommendations and ultimately design of a 2,600 feet of 96-inch bypass pipeline through a congested industrial area (in soft bay mud). 

Project

Dry Creek Levee Relocation
City of Roseville, California

West Yost provided planning, analysis, environmental review, permitting, design, and construction management services for the Dry Creek Wastewater Treatment Plant Pond Levee Relocation. This project included the hydrologic and hydraulic evaluations of setting the pond levees 100 feet back from the Dry Creek bank in order to provide 100-year protection of the wastewater storage ponds while enhancing the flow-carrying capacity of Dry Creek in an environmentally sensitive manner.

Commands