West Yost completed a number of sanitary sewer replacement
and rehabilitation projects for Union Sanitary District. These
projects include the Blacow Road Sanitary Sewer Replacement,
Willow Street/Central Avenue Sanitary Sewer Rehabilitation, Lower
Hetch Hetchy Corridor Sewer Improvements, and the Lower Warren
Avenue Sewer Relocation Projects. Sewer pipeline sizes range from
10-inches to 36-inches in diameter, and services have included
evaluation of rehabilitation alternatives (including CIPP),
hydraulic analysis, coordination with utilities and property
owners, final design, and services during construction.
West Yost provided design and construction management
services to expand the existing 14-Mile Slough Pump Station
(14-MSPS) by nearly 700%. This project represents one of the
largest trench-style wetwell pump stations in California. The
award-winning pump station upgrade increased reliable pumping
capacity from 3.75 mgd to 14 mgd, and with a buildout capacity of
22.5 mgd.
West Yost provided predesign, and design services for the
Northeast Industrial (NEI) Phase II sewer and water improvements
project. The project included sewer main designs, a collection
system pump station upgrade, and new water transmission mains.
West Yost provided preliminary and final design of one of the
largest cured-in-place-pipe (CIPP) projects in the U.S., to
rehabilitate approximately 44,700 feet of sewer using an
innovative liner material (iPlus®). The trunk line is 42-inches
to 60-inches in diameter and runs under major streets,
residential backyards, creeks, a freeway, through protected
wetlands, and near many homes, schools, and businesses.
Approximately 3,000 feet of the Franklin Trunk is also included
in the project.
West Yost managed the design of the Yolo Force Main, which is one
of eight projects in the Lower Northwest Interceptor Sewer
system. The Yolo Force Main project included approximately 25,000
feet of dual 66-inch diameter force mains and microtunneling of
twin 84-inch crossings under Babel Slough.
West Yost performed a condition assessment of the District’s
Marin City collection system and designed approximately 14,000
feet of sewer rehabilitation and repairs.
West Yost provided planning and design services for the
conversion of the Flag City Wastewater Treatment Plant to a lift
station and force main system. The project included
the design of a 0.73-mgd lift station and 13,200 feet of dual
6-inch diameter force main.
After determining that meeting effluent requirements with the
existing treatment facility was economically unpractical, the
County elected to convey sewage to the City of Lodi’s White
Slough Water Pollution Control Plant, rather than update the Flag
City treatment plant.
West Yost provided an award-winning project for Placer County
that provided a cost conscious solution to the rehabilitation of
the Auburn Ravine Lift Station (ARLS).
This project included an evaluation of alternatives to
serve the new Lower Lagoon Valley development. The project
evaluated various options including gravity sewer and lift
station alternatives. The selected project included a new 1.6-mgd
lift station with a biofilter for odor control and approximately
2,500 feet of dual 8-inch diameter force mains.
West Yost performed a condition assessment of the District’s
Marin City collection system of approximately 32,000 feet of
gravity sewers and designed approximately 14,000 feet of sewer
rehabilitation and repairs.
West Yost designed a new gravity sewer and 2-mgd lift station to
replace an existing 12”/10”/8” siphon pipeline that was
performing poorly and was difficult to maintain. Services
completed by WYA included surveying, permitting, design, and
right-of-way services. The project included distribution of 480
volt power, and instrumentation controls and communication via
radio with SCADA.
West Yost provided engineering services for the replacement and
rehabilitation of existing 8-inch and 12-inch diameter sewer
mains at various locations within the Bay Point Area of
Pittsburg, California.
West Yost designed a new lift station to replace the
existing Brooklane Lift Station. This replacement was necessary
because current flows exceed the capacity of the existing
station. The new 17-mgd lift station included a 30-foot-deep,
self-cleaning, trench style wet well, a below grade covered valve
and piping gallery, and an electrical generator building
partially over the wet well and valve gallery.
