Central Road Pump Station Replacement

Pump Station History 
The age of the Central Road Pump Station is unknown, but the condition indicates it has reached the end of its useful life. The pump station has been repaired over the years, but in its current condition only has one operable pump, requires manned entry to remove/replace the pumps, has a leak in the discharge piping within the wet well, and has flooded recently. SCDHEC R.61-67 provides regulations for the design and construction of wastewater facilities. The existing pump station fails to satisfy five (5) of the requirements set forth by SCDHEC R.61-67. The proposed project will replace and relocate the Central Road Pump Station. This will be done in an effort to ensure the pump station meets all SCDHEC regulations and provide reliable wastewater service in the future. 

Discussion of need 
In August 2022, the Town of Pendleton conducted a pump station assessment study to aid in prioritizing improvements to their pump station infrastructure. The assessment consisted of a site visit, drawdown test, review of design and operating points (if available), and assessment of existing conditions at each of the nine (9) pump stations. Each station was evaluated based on SCDHEC requirements, performance, and general observations. As a result of this study, the Central Road Pump Station was identified as a high priority for replacement. This is due to failure to meet SCDHEC requirements and poor pump performance.

Regulatory Requirements
There are five (5) SCDHEC R.61-67 requirements that the Central Road Pump Station fails to satisfy. They are listed as follows:

 • At least two (2) pumps or pneumatic ejectors shall be provided, unless the pump station serves only one (1) residential lot or one (1) building. • The pump station wet well and dry well shall be ventilated, excluding the valve pit.

 • For pump stations with duplex pumps each pump shall be designed to operate in a lead lag sequence and be on an alternating cycle.

 • Pump stations shall be designed to be fully operational during flooding to the 100-year flood elevation unless the influent flow into the pump station can be stopped.

• An emergency plan on the sewer pump stations shall be provided. An onsite standby generator, either permanently installed with capability to operate automatically or skid/trailer mounted types with appropriate connections provided. Because the station serves more than one (1) residential lot or building, at least two (2) pumps are required. With only one (1) functioning pump, the station fails to adhere to this requirement. This also prevents the pumps from operating in a proper lead lag sequence. Although a floodplain is not established for the area surrounding the pump station, flooding has been a recurring issue. For that reason, the station is seen as violating the requirement of being fully operational during a 100-year flood. The lack of adequate wet well ventilation, and absence of backup generator also violate requirements set forth by SCDHEC. Additional observed concerns include: actively leaking discharge pipe in the wet well, sediment and debris in the valve vault, a lack of site lighting, aged electrical equipment, the inability to remove pumps from the wet well from the ground surface.

Central-Rd-Pump-Station-Replacement-Location-Map.pdf(PDF, 259KB)