The City of Denison retained Plummer to replace the original pump station with a new intake structure and pump station. The City had recently installed a new 24-inch- diameter PVC pipeline leading from the existing pump station to the water treatment plant (WTP). The initial capacity of the pump station was 20 mgd with ultimate capacity at 30 mgd by the addition of pumps and another pipeline parallel to the one that had been recently constructed.
Two options were considered for the intake structure and pump. The intake options included a tower with bridge access versus non-tower pipe intake. The pump station options included a concrete cast-in-place wet well versus pumps installed with cans. Plummer’s assignments included preparing a project management plan, performing geotechnical investigations, conducting quality control workshops, assisting with bids, and providing construction phase services as well as special services. The pump station design included provisions to prevent the settlement of zebra mussels. These provisions included copper-clad intake screens and chlorine dioxide chemical feed facilities. A Section 404 permit was required for this project.