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RC Willson Plant Improvements

Five-phase project approach supports capacity increase of the R.C. Willson Water Treatment Plant.
  • Improvements increase capacity at R.C. Willson Water Treatment Plant-Gannett Fleming

    Multi-phased improvements will increase the plant’s capacity from 14 mgd to 20 mgd.

  • A study ranked necessary improvements at R.C. Willson Water Treatment Plant-Gannett Fleming

    A study ranked necessary improvements based on regulatory, reliability, and cost-based criteria.

City of Hagerstown

Hagerstown, Maryland

Our Role
Study, Plan Development, Construction Management.

14 mgd water treatment plant
In Progress
In Progress

• Effective design of wash water tank increases effectiveness of backwash system
• Underground concrete clearwell reservoir repairs improve chlorine contact time
• Additions and improvements will increase plant’s capacity from 14 to 20 mgd.

The R.C. Willson Water Treatment Plant (WTP) has provided Hagerstown, Maryland, with potable water since its construction in 1928. The original WTP produced up to 10 million gallons per day (mgd), and upgrades throughout the 1980s increased capacity to 14 mgd. During the 1990s, the City of Hagerstown retained Gannett Fleming to perform a study to define a project approach for affordable multi-phased construction of improvements to increase the plant’s capacity to 20 mgd.

What We Did

As a result of the study, Gannett Fleming developed a five-phase project approach that will bring the WTP up to 20 mgd. The phases include:

  • Phase I: Remedial structural repairs to basins, rehabilitation of flocculators, new rapid mixers, new polymer and pre-lime feed systems, and baffling underground concrete clearwell reservoirs to increase disinfection contact time
  • Phase II: Rehabilitation of filters, new wash water tank, and supervisory control and data acquisition (SCADA) system tied into WM Breichner WTP
  • Phase III: Complete structural renovation of pretreatment basins, new flocculator mixers and baffle walls, addition of settled water effluent collection system and vacuum type sludge removal equipment in sedimentation basins, sludge pumping station, new post-chemical systems, new basin lighting, and site improvements.
  • Phase IV: Upgrade wastewater clarification and residuals handling facilities
  • Phase V: Upgrade electrical system and high service pumping systems.

Gannett Fleming has provided design and construction phase services for Phases I, II, and III. The firm also is providing construction management services for Phase IV, including coordinating and managing the construction of the clarification and residuals handling facilities from award phase through construction completion and start-up.

Gannett Fleming also was responsible for pretreatment facility improvements, including rapid-mix basin modifications, flocculator rehabilitation, and upgrade of sedimentation basins including structural repairs, setting the course for the WTP’s expansion.

Key Features

  • Criteria-based study ranked necessary improvements
  • Assessments ensured the plant’s capability meet safe drinking water regulations and amendments.

Similar Projects: Water/Wastewater: Drinking Water, Drinking Water: Water Treatment Plants, Water/Wastewater