HomeMy WebLinkAboutItem 05.c• Lakeville's Water Quality
The annual drinking water quality
report, also know as the Consumer
Confidence Report (CCR), was
published in the "This Week"
newspaper on Friday, May 27. In a
nutshell, the CCR detailed Lakeville's
water quality for 2010. The CCR
provides residents with information
about the sources of Lakeville's
water, levels of contaminants and
their sources, any associated health
effects, the water system's ability to
provide safe drinking water, and the
water system's compliance with safe
drinking water rules and standards.
Again, for 2010, the quality of
Lakeville's water is better than what
federal standards require. High
quality water sources and a highly
effective treatment process
combined with a licensed,
professional staff consistently deliver
safe, clean drinking water to City residents. Maintaining the quality of
Lakeville's drinking water is central to the Operations & Maintenance
Department's mission.
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Annual report on drinking water quality for Lakeville
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••• Valve Replacement
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LAKEVILLE OPERATIONS & MAINTENANCE
Christopher Petree, Director
May 2011
Occasionally, what seems to be a water main break is the result of another
problem entirely. Recently, Utilities Division staff responded to a presumed
main break at 175th Street and Freeport Way to find water coming out of the
gate valve box. They were able to
shut the valve and stop the flow of
water. The location of the water leak
indicated that it was the result of a
problem with the valve and not the
pipe. In digging down and
uncovering the valve, staff found that
the bolts holding the valve on had
corroded so badly that the valve was
leaking. The loose valve cover,
coupled with water pressure,
displaced the rubber gasket in the valve resulting in the leak. As is typical, the
water found the path of least resistance to the surface up through the valve
box where the water pressure forced off the valve box cover. The repair was
simply to replace the gasket and the bolts. To ensure longer life from the
bolts, staff replaced the original mild steel bolts with stainless steel bolts.
• Velocity Patching
Potholes and shallow surface failures are
common in the spring as changes occur in
the roadway as a result of the spring thaw.
For deeper potholes, the Streets Division
uses hot mix asphalt to fill the holes. Hot
mix asphalt, however, is not as effective in
taking care of the shallow surface failure
since the application is so thin. That is
where velocity patching comes into play.
Velocity patching is a method of
repairing the road surface that involves
blowing emulsion and aggregate into an
area to be repaired. In this operation,
the patching truck pulls up to the surface
failure and, using high- pressure air, blows
water and debris away. Next, it sprays a
binder over the area to seal the surface
and to hold the aggregate in place. Then
it sprays aggregate that has been coated
with emulsion into the repair. The
emulsion helps the aggregate stick
together and to the repair area. The
material is compacted as it is sprayed
into the repair making for a long lasting
and cost effective repair. Lastly, the
repair is sprayed with dry aggregate
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leaving an immediately drivable surface. The benefits to velocity patching are
the ability to fill both potholes and shallow surface failures quickly and
effectively and the durability of the repair due to the compaction during
application. Velocity patching is part of the Streets Division annual pavement
management plan.
• Water Treatment Facility Tours
Students from
both Cherry View
Elementary and
Lakeville South
High School
stopped by the
Water Treatment
Facility in May to
get a better idea
of where their
drinking water comes from and
how the treatment process
works. Both groups got a first
hand look at how the filter
beds operate and how the
backwash process keeps them
at peak performance. They
also got a close up look at all
the piping and pumps that go
into moving water through the
facility and out to the water
towers. In addition to an
overview of the processes within the facility, elements of the tours focus on
fragility of the groundwater system of aquifers and the increasing demands of
population on this limited resource. Staff at the Water Treatment Facility is
happy to provide tours of the facility to residents and groups. Those interested
can call the Utilities Division for more information.
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