Raw Water Supply & Treatment Plant Expansion, Boone, NC

ACEC/NC Engineering Excellence Award Winner

WK Dickson provided planning, environmental assessment, permitting coordination, funding assistance, engineering design and construction administration for the construction of a new 6.0 MGD raw water intake, the expansion of the Town’s existing WTP from 3.0 MGD to 4.5 MGD, planning for Phase II WTP expansion, and construction of 12 miles of 24-inch water transmission main.

Originally designed and placed in service in the early 80s, town had two raw water intakes permitted for a combined capacity of 3.0 MGD and an existing conventional water treatment facility, which treated up to 3.0 MGD. WK Dickson previously completed a Water Supply Master Plan for the Town of Boone that projected their 50 year water needs at 11.0 MGD. At the new intake site, numerous design alternatives were first evaluated, and the selected alternative, an infiltration gallery, was designed so there would be no negative impacts to river aesthetics, recreation, or stream flow.

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As a result of the project, Boone was able to increase the capacity of their existing WTP from 3.0 to 4.5 MGD by increasing filter rates at the plant and making other necessary operation and maintenance upgrades. Improvements at the plant included upgrades to the existing flocculators, rapid mixers, settling basin, filters, chemical feed equipment, the addition of onsite generation of chlorine disinfectant to replace chlorine gas as well as a second clearwell. These improvements expanded the capacity of the plant while keeping it in continual operation on a very constrained site.