Aiken, South Carolina
GMC completed a study (Phase I) for the Horse Creek Pollution Control Facility and a design (Phase II) based on the findings of the study. This process provided a confident course of action for the utility. As a result of the project, the facility now has a primary design capacity of 26 MGD with a peak of 65 MGD and a secondary capacity of 20 MGD with a peak of 40 MGD, utilizing a 20-MG offline equalization basin.
The design included one new 400-HP pump with variable frequency drives in Pump Station #1, along with a new 42-inch force main in parallel with the existing one for increased pumping capacity. Modifications to the headworks included new coarse bubble diffusers, blowers, airflow meters and effluent weir in the existing aerated chamber, followed by a new parallel Parshall flume. Primary clarifiers received new drive units and control panels. A junction box was reconfigured to allow for offline equalization.
Updates to the biological process consisted of three (3) new oxidation ditches with space for a future fourth ditch and designated areas for nutrient removal (nitrogen). At Pump Station #3, one (1) of the 200-HP vertical turbine aerated sewage pumps and five (5) of the return activated sludge (RAS) pumps were replaced. The hydraulic system and piping in the reuse water system were improved to increase efficiency and reduce problematic surges and water hammer. This was accomplished by installing premium efficiency motors, variable frequency drives and hydro-pneumatic systems.
“I’ve always appreciated GMC’s responsiveness, technical expertise and personal service. They helped us navigate through one of the largest SRF projects in state history and in Aiken County PSA’s history. They are the right sized firm for what we needed!”
— Mark Cook, Aiken County Public Service Authority
Electrical improvements were made throughout the facility. This included a new 3-MW generator designed to provide backup power and increased efficiency of standby power. Multiple medium voltage switches and unit substations were replaced to improve the safety and operational ability of the facility’s electrical system. Site and process lighting were updated to enhance energy efficiency.
GMC provided construction materials testing and inspection services during construction. GMC services included concrete testing using an on-site concrete laboratory, monitoring installation of 1000+ Vibropiers for ground improvement and foundation support, sampling/testing of concrete, and observing/inspecting of reinforcing steel. The construction of the project was delivered via Construction Manager at Risk.