West Yost completed facility master planning and design to
address changing regulatory requirements for the City’s Easterly
Wastewater Treatment Plant. This project includes $130 million of
improvements required to meet new regulatory requirements and to
abandon the old North Plant and replace it with capacity in the
New South Plant.
West Yost provided planning and design for the City of Atwater’s
new Regional Wastewater Treatment Plant. The new plant was
required to increase average flow capacity to 6 mgd (expandable
to 12 mgd ultimate) and comply with new regulatory requirements
for advanced treatment. West Yost evaluated upgrades to existing
treatment plant facilities as well as alternatives involving
abandoning the existing plant and constructing new facilities on
a City owned site five miles from town.
West Yost is assisting the City of St. Helena in the development
of the best compliance solution for several outstanding
regulatory issues associated with their 0.5 mgd Wastewater
Treatment Facility (WWTF). One of the major drivers of the
proposed project is the need for expansion of the currently
available disposal operations, which include surface water
discharge to the Napa River from December through April, and land
application on property located adjacent to the treatment
facility. This project has capitalized on West Yost’s
understanding of and experience with wastewater permitting, and
includes ongoing interaction with the San Francisco Bay Regional
Water Quality Control Board.
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 was originally retained by the City to perform
facilities planning, design, and construction services for a
major expansion and upgrade to the City’s Water Pollution Control
Plant (WPCP). The wastewater facilities planning process
incorporated the City’s unique vision of combining natural
treatment systems with conventional treatment processes to
provide reliable effluent water quality while creating wetlands
and other habitat features that serve as a showplace and resource
for the region. This $13 million project involved expansion of
virtually all pumping and treatment facilities, laboratory and
personnel space, and provided for an improved level of secondary
treatment to bring the plant into regulatory compliance and to
increase plant capacity from 5.3 to 7.5 mgd.
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.
The District operates a plant with four large lagoons followed by
disinfection prior to discharge to the Klamath River. It was
anticipated that the Total Maximum Daily Loads (TMDLs) to
the Klamath River would result in some of the most stringent
treatment requirements in the state. West Yost prepared the
facilities plan in response to preliminary TMDLs that were being
developed for the Klamath River. The initial draft of the
facilities plan was completed. An initial assessment of the
treatment plant indicated that for the short term, supplemental
aeration was needed in the lagoons, especially during cold
weather when the lagoons could freeze. In addition, improvements
to the preliminary treatment system were identified.
West Yost is assisting the City of St. Helena in the development
of the best compliance solution for several outstanding
regulatory issues associated with their 0.5 mgd Wastewater
Treatment Facility (WWTF), including an evaluation of the City’s
water reuse options.
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 completed the Facilities Plan for the Regional Water
Reclamation Facility (RWRF) in 2000 and recently updated the plan
to address newly adopted Total Daily Maximum Loads (TMDLs) for
temperature. The RWRF serves the urban areas of the Rogue Valley
including Medford, Central Point, Phoenix, Jacksonville, Eagle
Point, Talent and White City. The plan includes an assessment of
the existing facility capacity, flow and load projections, and
will incorporate a comprehensive energy management plan with
the goal of energy self-sufficiency.
