West Yost assisted the City of Woodland in expanding their
Wastewater Treatment Plant (WWTP) capacity from 7.8 mgd to 10.4
mgd, while also providing new tertiary treatment facilities
(oxidation, coagulation, and filtration and ultraviolet (UV)
disinfection of the effluent.) The project consists of an
expansion of the secondary process, new tertiary facilities, and
100-year flood protection for the main portion of the treatment
facility.
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.
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.
