Pendleton-Clemson Regional WWTP was originally designed and constructed based on the aeration basins as the sole treatment process unit. A major upgrade of the WWTP was completed in 2010 to add multiple process units, including screening, grit removal and Parshall flume upstream of influent pump station, 0.5MG in-line and 4.0MG off-line equalization basins, tertiary disc filters, and UV units.
The Utility chose Harper to provide CM At-Risk services for a 3MGD expansion to the existing 2MGD WWTP, bringing the total capacity to 5MGD. The new WWTP facilities will include all necessary processes to provide high quality effluent water, meeting wastewater treatment standards and all regulations. The scope of expansion for the project includes a new headworks and influent pump station, new fine screening and grit removal, bioreactor treatment to replace aeration basins, an additional digester tank, new filters, and upgraded UV.
INNOVATIVE METHODS
During preconstruction, the team battled inflation of costs due to the pandemic and long lead times for critical items. Early and detailed planning of the costs and schedule during preconstruction were critical in making this a successful preconstruction effort.
As part of the CM At-Risk preconstruction process, our team was able to heavily influence the final design and scope of the project. The design modifications were based on pricing of market conditions in real time. Changes that Harper contributed to the project included researching and ultimately selecting an alternative treatment technology, relocating the influent pump station and headworks within the site, and creatively rehabilitating portions of the plant in lieu of full replacement, among others. All of the changes proposed by Harper and accepted by the engineer and owner brought cost savings to the project through upfront capital cost and schedule savings, all while maintaining the original goals of the project.
