Facility Planning

Project

Easterly Wastewater Treatment Plant Tertiary Treatment Improvements
City of Vacaville, California

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.

Project

Facility Study/Preliminary Design and WWTP Improvement Design
City of Galt, California

West Yost assisted the City of Galt (City) 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.

Project

White Slough Water Pollution Control Facility Expansion/Upgrade
City of Lodi, California

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. 

Project

Regional Wastewater Treatment Plant Planning and Design
City of Atwater, California

West Yost provided planning and design for the City of Atwater’s new Regional Wastewater Treatment Plant (WWTP). 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.

Project

Easterly Wastewater Treatment Plant Expansion
City of Vacaville, California

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) and to provide nitrification so that effluent ammonia limits of < 2mg/L could be reliably achieved – 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.

Project

Wastewater Reliability Evaluation and Prioritized Facilities Improvement Plan
Mt. View Sanitary District, California

West Yost recently performed a facility reliability, condition assessment, regulatory compliance evaluation, and recommendations plan for Mt. View Sanitary District’s Wastewater Treatment Plant (WWTP).

Project

Wastewater Reuse Evaluations
City of Davis, California

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). West Yost also provided a number of services to the City in evaluating various reuse opportunities on areas surrounding the WPCP.

Project

Flag City WWTP Facilities Planning and NPDES Permit Assistance
San Joaquin County, California

West Yost provided a facility assessment for the original design of the 0.16 mgd, Flag City Wastewater Treatment Plant (WWTP). This work included an evaluation of the disposal capacity of the onsite storage pond, and an evaluation of several long-term disposal and reuse options. Through this study, it was determined that continued land disposal in the short-term was not feasible. Therefore, this study culminated in the development of an NPDES permit application and Report of Waste Discharge to allow for surface water discharge. West Yost provided support services throughout the permit renewal process, including negotiations with Regional Water Quality Control Board staff, and data analysis.

Project

Wastewater Treatment Improvements
City of Davis, California

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.

Project

Wastewater Facilities Plan
South Suburban Sanitary District, Oregon

The District operates a plant with four large lagoons followed by disinfection prior to discharge to the Klamath River. It was anticipated that the nutrient 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.

Project

Facilities Plan and Design Services for the Regional Water Reclamation Facility
City of Medford, Oregon

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.

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