Phased Expansion of Water Treatment
Plant
Southern Pines, North Carolina
Hobbs, Upchurch & Associates conducted a study for the Town of Southern Pines,
North Carolina that recommended the phased expansion of the water treatment
plant to meet the demands of the Town and its regional water customers.
Key Elements
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Detailed evaluation of water treatment plant and all facilities
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Design for chemical feed system upgrade
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Design for high rating of existing 4 MGD to 5.5 MGD
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Design of new 4 MGD train
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Study and design of disinfection alternatives
Hydraulic Analysis and Master Plan
HUA completed a
hydraulic analysis and Water Master Plan to project capacity requirements and
major transmission infrastructure needs to accommodate growth in the area and
determine phased improvements. The Master Plan was used to identify water
treatment plant and distribution system improvements. HUA completed cost
estimates and recommended timelines for project implementation. Improvements to
the water treatment plant and pumping have been made in four phases.
Distribution system improvement projects included nine phases of work, each
typically consisting of approximately 10 miles of water main upgrades.
Water
Treatment Plant Design
HUA has performed
a detailed analysis of the water treatment plant including treatment process,
equipment, and structures. The first phase of plant improvements was the
replacement of chemical feed equipment throughout the plant.
The second phase of the project involved the expansion of the plant from 4.0 to
5.5 MGD through the installation of inclined plates in the clarifier and other
modifications to increase plant flow with existing assets. This project was
completed in 1999.
The next phase involved the expansion of the WTP from 5.0 MGD to 8.0 MGD. This
phase consisted of a second treatment train and upgrades to the raw water
intake. The design included new raw water pumps, new flash mix, SuperPulsators,
new filters, sludge handling, and upgrades to the finished water pump station.
The study which recommended the expansion of the water treatment plant also
included recommendations for a new ground storage tank and a booster pump
station. The existing high service pumps at the WTP were not adequate to allow
the Town to utilize the full capacity of the expanded treatment facility.
Extensive coordination was required to identify a site for the new ground
storage tank. HUA worked with the Town to evaluate various tank sites with
respect to hydraulic impacts and engineering design.
The project was completed on-schedule and within budget in 2002. The
construction cost was $3,253,000 which was $112,000 under the original
estimate.
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