Burns & McDonnell provided design services for the new 8 million-gallon-per-day (MGD) Jackson Springs Water Treatment Plant in Rapid City, S.D. The plant design included a Coanda intake structure, raw water pump station, automatic strainers, a rapid mix basin using a mechanical mixer, followed by a three-stage flocculation, high-rate inclined plate sedimentation, and submerged ultrafiltration membranes. In addition, the plant provides bulk chemical storage and feed systems for six water treatment chemicals.
The raw water pump station can deliver two water supplies to the plant with any blending ratio. Backwash waste from the membrane filtration system is recycled to the head of the pretreatment system to maximize overall water recovery. The finished water is pumped from a new clearwell to two pressure zones.
Surface water intake structure
Raw water pump station
Chemical feed systems and storage
High-service pump station
Rapid City uses both surface and groundwater sources to meet potable water demands. In 2004, one of the city's main sources, the Jackson Springs Infiltration Gallery, was reclassified as groundwater under the direct influence (GWUDI) of surface water. Burns & McDonnell made recommendations to help the city meet its water demands over the near term and conducted evaluations to determine the most appropriate long-term solution.
By using a customized procurement process, the membrane filtration system was procured before the final design phase to allow Burns & McDonnell to optimize the design of the new facility and minimize overall project costs. The unique procurement process reduced the potential for change orders and/or redesign that could otherwise result from a general contractor's procurement.
Burns & McDonnell was responsible for all design aspects of the project, including pre-design evaluations, process and ancillary equipment design, development of opinions of probable cost, preparation of bid documents, and construction-phase services. This project required in-depth coordination with many outside review agencies, including the local building department, fire department, South Dakota Department of Environment and Natural Resources, South Dakota Game, Fish and Parks, and the Rapid Canyon Sanitary District. Burns & McDonnell and the city held informational meetings with stakeholders to promote public participation in a successful project.