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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 Hill – Water
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.
SKF – Sludge
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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