Saddle Creek Retention Treatment Basin Project


 

This time lapse video illustrates Saddle Creek Retention Treatment Basin construction progress from June 2019 through July 2020. Construction on the top half of the screen includes a temporary earth retention system, soil excavation and installation of deep foundations supports. Activities on the bottom half of the screen include a new combined sewer diversion structure; two, 120-inch sewers and a new concrete channel liner. H-Pile installation for the foundation in the basin was completed in April 2020 and the focus for the next 12 months will include placing rebar and pouring concrete to construct the basin.

 

Schedule

Mass concrete pours continue through 2020 to construct floors, columns and basin walls.

  • 66-inch Sewer Install: Winter 2020
  • Basin Concrete: Winter 2020
  • Operations Building: Summer 2021
  • Chemical Building: Summer 2021
  • Substantial Completion: Winter 2023
  • Final Completion: Summer 2023

Project Description

The Saddle Creek Retention Treatment Basin (RTB) facility will provide improved water quality for the Little Papillion Creek.

The Saddle Creek RTB is an important project for Omaha’s water quality Program, called Clean Solutions for Omaha (CSO!). More than 50 times a year during wet weather events, untreated combined sewage overflows into the Little Papillion Creek from the sewer outfall located near 64th and Center – just south of the UNO Baxter Arena.  

The purpose of the RTB facility is to capture this water and treat it during wet weather. Combined sewage will be diverted from an existing outlet channel to the facility headworks, where large materials like cans, rocks, tree branches and floatable solids are removed using a grit pit and mechanical screens. At this point in the process, a disinfectant is added. If it is a small wet weather event, the combined sewage will be retained in the underground basin and then sent to the Papillion Creek Water Resource Recovery Facility (PCWRRF) after the conclusion of the event for treatment. If the underground basin fills up, a decholorination agent is added to the discharge, which is conveyed through an overflow channel and discharged back to the creek.

The RTB will use pumps to empty the facility after a wet weather event has ended. The dewatering pumps will convey captured combined sewage volume into the downstream Papillion Creek Interceptor sewer for treatment at the PCWRRF.

Above ground improvements include a building to house controls, grit and screening equipment, and chemicals.  The building will provide office space for full-time staff, some additional city offices and maintenance access to the facility.

An odor control system will be installed to address the risk of odors from the facility. The site will include fencing and lighting for security purposes. Deliveries will occur regularly but are not expected outside of typical business hours.

Over 190,000 tons of soil have been excavated to create space for the construction of the 3.3 million gallon basin. Once completed, the basin will capture and treat a combined sewage flow rate of 160 million gallons per day.

Steel beams have been driven into the foundation of the concrete basin to support the facility's structure. These 848 steel beams (approximately 13 miles in total) support the weight of concrete, water, soil and other building materials. While 90% of the pile driving was completed by May 2020 for the underground basin, additional deep foundation supports will be installed in 2021 for the above-ground operations and chemical buildings.

The concrete work for the first phase of the channel and diversion structure was also completed in early 2020.

Construction from summer 2020 to fall 2021 will focus on placing rebar and concrete pours. Approximately 25,000 cubic yards of concrete, roughly 2,500 truckloads, will be used to construct the basin and the facility’s walls.

Updated November 2020

Saddle Creek Retention Treatment Basin, Artist's Rendering