WTP Filter Media Replacement Project
Overview
The South Granville Water and Sewer Authority (SGWASA) has initiated a critical infrastructure project to replace aging filter media at its water treatment plant. This project ensures continued compliance with state and federal water quality standards and supports SGWASA’s commitment to delivering safe, high-quality drinking water to the community.
The SGWASA water treatment plant is a conventional facility rated for 7.5 Million Gallons Per Day (MGD).
Key components include:
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Rapid mix basin
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Two-stage flocculation
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Five sedimentation basins with inclined plate settlers
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Five dual-cell granular media filters
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Chlorine contact basin
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Clearwell storage
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Finished water pumping station
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Background
In September 2024, SGWASA engaged Hazen & Sawyer to evaluate the condition of the plant’s granular filter media. The resulting technical memorandum confirmed that the filter media had surpassed its 10–15 year life expectancy and required immediate replacement.
The aging media had reduced efficiency in removing sediment, manganese, iron, and turbidity—key factors in maintaining water quality.
Based on these findings, Hazen & Sawyer developed a comprehensive task order that includes:
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Final design of filter media and underdrain nozzle replacements
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Permitting
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Competitive bidding administration
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Construction oversight
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This work is essential to ensure the plant continues to produce high-quality finished water.
The cost of the new task order for design, permitting, bidding, and construction oversight services is $222,800.00.
