Rivanna and Moores Creek Pump Stations
Hazen and Sawyer provided preliminary engineering, detailed design, permitting, and construction services for Rivanna Water and Sewer Authority (RWSA) to upgrade two major influent pump stations: the Rivanna Pump Station (RPS) and the Moores Creek Pump Station (MCPS).
Project Outcomes and Benefits
- Designed a detailed sequence of construction that allowed for continued operation of the pump station during construction.
- Led a successful, yet challenging, public participation effort to get resident support of RPS expansion from 23 mgd to 53 mgd.
- Completed construction of all project phases without a single sanitary sewer overflow or any issues with plant operations.
The improvements to MCPS included replacement of existing pumps with higher capacity VFD controlled pumps, rehabilitation of the existing influent channels and dry well, installation of sewage grinders, and construction of a new electrical room in an adjacent building, as well as installation of a new parallel 24-inch force main. Other work consisted of electrical equipment including a new motor control center and auto-transfer switch as well as HVAC work. A complete hydraulic evaluation of the pump station, including a complete transient evaluation (surge) and dual force mains was included.
The 25-mgd to 53-mgd expansion of the RPS involved a new site evaluation process including presentations and incorporation of public and RWSA input. Hazen, with support of a public outreach coordinator, led the successful, yet challenging, public participation effort considering the proximity of the existing RPS to residences. Ultimately, the RPS was relocated from the original park site to the Moores Creek Advanced Water Resource Recovery Facility via a 1,600 lf hard rock tunnel. The upgraded RPS pump station has high and low flow pumps and sewage grinders. The RPS utilizes a dual self-cleaning, wet well configuration designed in compliance with Hydraulic Institute Standards to minimize wet well maintenance.