Wastewater Treatment Projects:
Wastewater Treatment Plant Planning
 
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DSRSD
WWTP Master Plan Update

WBA managed and participated in preparation of Dublin San Ramon Services District’s wastewater treatment plant master plan. The treatment plant has a current average dry weather flow capacity of 11.5 mgd. Projections for rates of growth in the service area indicate that this capacity will be exceeded. Since capacity is projected to be reached in a short time frame, the master plan update was completed on a fast-track basis. WBA prepared an implementation plan for the planning, detailed design and construction of improvements to meet the short timeframe and worked in conjunction with another engineering firm to complete the necessary technical work for the master plan. WBA is also the program manager for all the improvements necessary at the DSRSD treatment plant. There are many distinct projects which require planning, design and construction to satisfy the necessary expansion and improvements. WBA has prime responsibility in ensuring that the various projects are properly coordinated.

Town of Yountville
WWTP Master Plan Update

The Town of Yountville, located in the Napa Valley, required a complete evaluation of its wastewater treatment and disposal systems at current and projected future flow rates. This study was required because the existing land disposal area, then used to grow hay, was in the process of being converted to a new golf course. The study involved evaluating current wastewater flows and characteristics and projecting future flows and characteristics based on Town planning and population projections. The capacity of the existing wastewater treatment plant was evaluated and recommendations were made to optimize O&M costs now and in the future. Because the Town is permitted to discharge treated wastewater to the Napa River only during winter months, it must store effluent for winter discharge or use the treated water for irrigation. A major portion of this project involved optimizing the use of storage for later discharge to the river and effluent reuse. WBA prepared and used a mathematical model to simulate river flows, allowable dilution ratios to the river, precipitation, multiple crop requirements, and storage requirements. The final report included recommendations, cost breakdowns, and schedules for implementation. WBA continues to assist the Town with implementing the recommended improvements.

City of Morgan HillWater Reclamation Feasibility Study
The City of Morgan Hill retained WBA to evaluate alternatives to upgrade and expand a regional wastewater system. As the need to commit to the regional system was fast approaching, the City needed a thorough evaluation and preliminary feasibility study with an associated cost estimate quickly. WBA developed a model to determine system needs and unit costs. A key element in the project involved estimating the size of the reservoir required to store reclaimed water for irrigation. The model developed by WBA enabled estimation of the size of the required reservoir, the volume of earthwork required, and the construction cost of alternative reservoirs to accommodate changing wastewater flows and irrigation requirements. Based on this work, the City found that it could implement its own wastewater reclamation program at nearly the same cost as its share of the regional plant.

SKFSludge Dewatering Study
WBA conducted a Sludge Dewatering Study for SKF to estimate the onsite sludge drying bed dewatering capacity and to evaluate a supplemental mechanical dewatering system to handle the sludge production in the winter months when the onsite sludge drying beds are not operational. The study concluded that a supplemental mechanical dewatering system is a viable and cost effective means for the District to effectively manage the sludge production during the winter months.

Based on one of the recommendations as adopted by the District, WBA developed an onsite pilot study program and coordinated with two sludge dewatering equipment manufacturers, one for a belt press system and one for a centrifuge system, to perform onsite sludge dewatering pilot studies. Based on the results of the pilot studies, WBA prepared a “Sludge Dewatering Pre-engineering Study” to define the general requirements of the sludge dewatering system and to evaluate the life cycle costs of the belt press and centrifuge systems. The study concluded that a centrifuge system is the recommended alternative for the District.


The above projects are representative of our experience in this area.
If you would like additional information on these, or other projects that
we have completed, please contact us.

For detailed descriptions of representative projects in our other areas of expertise, click below on the category you are interested in:

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