Hazen and Sawyer Chosen for Brunswick County Plant Upgrade
Upgrades to North Carolina Plant to Expand Capacity and Improve Reliability
(Charlotte, NC – August 31, 2009) – Hazen and Sawyer has been selected to provide Design and Construction Phase Services for the upgrade of the Northwest Water Treatment Plant (NW WTP) in Brunswick County, North Carolina.
Brunswick County, NC, is located in the southeastern corner of North Carolina, along the border with South Carolina. The County includes a number of rapidly growing coastal communities that are served over a 90- mile stretch of water transmission pipelines. The County owns and operates two water treatment plants – the Northwest Water Treatment Plant and the 211 Water Treatment Plant.
The existing surface water plant treats water from the Lower Cape Fear River, and consists of rapid mix, up-flow sludge-blanket clarification, media filtration, clearwell storage, and high service pumping. Chlorine dioxide is used as a pre-oxidant and as a primary disinfectant, followed by chloramines as the residual disinfectant.
In 2008, Hazen and Sawyer prepared a Preliminary Engineering Report for the County that identified alternatives to expand the NW WTP from 24 to 36 MGD, and also recommended immediate improvements to ensure continued reliable operation.
The initial project will consist of a new chemical storage facility, improved chemical truck off-loading, yard piping, a second circular clearwell, and a new chemical injection and flow meter structure. Flexibility will be incorporated to allow either chlorine or chlorine dioxide to be used for primary disinfection, with the option to convert to chloramine disinfection prior to the second clearwell (See site plan below for additional detail).
Since our founding in 1951, Hazen and Sawyer has focused on two things: providing safe drinking water and controlling water pollution. Our range of services encompasses the planning, design, and construction management of water and wastewater-related projects – from clean water treatment, storage, and distribution to wastewater collection and treatment.