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Village of Oak Ridge, Missouri
In April 2002, residents of the Village of Oak Ridge voted
to pass a $900,000 bond issue to finance the construction
of a wastewater and collection system. The Village retained
Strickland Engineering to perform an engineering study
to determine construction, operation, and maintenance costs
of a wastewater system. This study was used by the Village
to apply for funding from government agencies. The Village
has obtained the necessary funding to proceed with the
construction of a wastewater collection and treatment system.
In June, the Village was awarded a $488,950 Community Development
Block Grant from the Missouri Department of Economic Development.
In September, the Village was selected to receive a $456,000
loan and $303,000 grant from the USDA Rural Development.
A grinder pump pressure sewer system will be constructed
to collect the wastewater. This system utilizes a grinder
pump basin at each house or building. This system conveys
waste solids suspended in water. The pump grinds solids
collected in the pump basin into small particles creating
a slurry
that can be conveyed through small diameter pipes. The
force mains range in size from 2 to 4 inches.
Each building is typically connected to the force main
with a 1-1/4 inch service lateral. The connection to
the force
main includes a check valve to prevent flow from the
force main to the lateral and an isolation valve to be used
during
maintenance.
The principal components of this system are the grinder
pump basin, service lateral, and control panel; all
are located
at each house or building. Pump basins are sized based
on the house or building design flows plus an allowance
for
emergency storage. The grinder pumps are equipped with
0.5 to 2.0 horsepower motors controlled by float switches.
Each
basin is also equipped with a high-alarm float. The
control panel will be connected to the electrical service
of
the house or building and the electricity for operation
of
the pump will be included on your electric bill.
Grinder pump pressure sewers can be installed at relatively
shallow depths, which can result in lower construction
costs. The small diameter force mains also allow
for installation by trenching or horizontal directional
boring. Operation
and maintenance of grinder pump systems include maintenance
of the pump and electrical controls, and pipeline
cleaning.
An aerated three-cell lagoon system will be constructed
and discharge into Byrd Creek. The system is essentially
self-operating,
as it requires no on-site pumps and little maintenance.
The construction consists primarily of earth excavation,
embankment
construction, and liner placement. Maintenance
involves only regular servicing of the blower system
and mowing
of the
grass.
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