West Yost is assisting the Woodland-Davis Clean Water Agency in
an Owner’s Representative capacity for the program and
Design-Build-Operate (DBO) procurement contract management, water
rights acquisition, public outreach, environmental permitting and
preliminary design of a new regional surface water supply
project. The project will consist of a diversion intake facility
on the Sacramento River, a conveyance pipeline from the intake to
a new 56-mgd capacity water treatment plant, and a pipeline
distribution system to the participants’ service areas.
Construction on the new facilities is expected to begin in 2016.
In 1997, West Yost was retained by the City of Vacaville (City)
to perform evaluations to expand the Easterly Wastewater
Treatment Plant (EWWTP) from 6 mgd to 15 mgd average flow
capacity (and from 27 mgd to 55 mgd peak flow capacity) –
referred to as the Expansion Project. This project included all
aspects of facilities planning, design, construction services,
NPDES permit assistance, and State Revolving Fund (SRF) loan
coordination for a major $100 million expansion and upgrade
program to the City’s EWWTP.
West Yost provided planning, design, and construction
management for the Ophir Road Pump Station. This pump
station constructed about a mile upstream and 210 feet
above the Auburn Tunnel outlet, allows Placer County Water
Agency (PCWA) to pump water from the tunnel for municipal
and agricultural use. It is designed to pump 332 cfs of
water through three distinct pump stations, housing 11 vertical
turbine pumps ranging in size from 200- to 600-hp.
West Yost designed a new 4-MG potable water storage tank and
booster pump station for the City of Davis. Project
components included a prestressed concrete tank, pump station
building, chlorination facilities, perimeter fencing,
landscaping, offsite utilities, and SCADA. Related issues
included locating a potential cell tower on the tank site and
providing for future delivery of treated surface water to the
water storage tank.
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 assisted the City of Galt in identifying and analyzing
alternatives for achieving compliance with NPDES permit
requirements. West Yost prepared a Permit Compliance Action Plan
that recommended alternatives. The City used this information to
proceed with near-term treatment facility improvements that will
also position the City to be responsive to future growth needs,
as well as additional changes in regulatory requirements. The
addition of filtration and ultraviolet (UV) disinfection was
identified as an important first step towards achieving
compliance with the City’s discharge permit. West Yost worked
with the City to pilot test filters and provided the preliminary
design of these new treatment processes.
West Yost has been providing wastewater treatment and
disposal system planning, regulatory compliance services and
engineering design for the City of Lodi White Slough Water
Pollution Control Facility (WPCF) since the late 1990’s. West
Yost completed design of the City’s $60 million improvement
project at the WPCF, incuding tertiary filtration and UV
disinfection facilities, expansion of the treatment capacity from
approximately 6.5 mgd to 8.5 mgd, and the addition of process
improvements to provide full ammonia conversion and partial
denitrification.
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 an award-winning project for Placer County
that provided a cost conscious solution to the rehabilitation of
the Auburn Ravine Lift Station (ARLS).
West Yost prepared a 2-dimensional storm drainage model for a
proposed 400 MW solar power project covering 4,000 acres in
the Ivanpah Valley in the Mojave Desert in California. The
project is situated on an alluvial fan located at the base of the
Clark Mountain Range. Flood flows from the mountains are
initially confined in incised channels, but once arriving on the
alluvial fan, the flood flows are less confined and can take
random paths across the fan.
West Yost provided hydraulic analysis, predesign, design, and
construction management and inspection for the
award-winning, Stoneridge Water Storage Facility. The
project consists of a 2.9 MG prestressed concrete,
partially buried, tank and associated inlet/outlet piping,
control valves, drains, and site improvements.
West Yost prepared a Sanitary Sewer Master Plan for the
Clean Water Services District (District). The project
included evaluating the system, expanding and updating the
collection system hydraulic model, and ranking problem areas
according to severity of surcharging under three development
conditions in order to differentiate between near-term and
long-term projects.
