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Construction Update 04: Significant Progress on Headworks and Clarifier Construction


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Aerial view of a large construction site at a wastewater treatment plant. There are several circular structures in various stages of construction, as well as large rectangular tanks and ponds. Heavy machinery, such as cranes and excavators, are visible on the site. The surrounding area is rural farmland.

This week, we’re excited to share the latest plant construction progress. The Headworks building is moving forward with the backfilling process, along with the installation of influent pipes and manholes, which are key for the building's infrastructure. At the Secondary Clarifier, the slab and rebar are installed and concrete is poured in all wall forms. The Dewatering building is also advancing, as the building's main cement slab has been poured and is currently curing. Additionally, more wall sections in the Oxidation Ditch are being completed, marking another step forward in the construction's progress. 

Our office remains open during regular hours — Monday through Friday from 9:00 AM to 3:00 PM.

Beautiful Views at Niwot Sanitation

An aerial view of a construction site surrounded by agricultural fields and greenery. The site includes various buildings under construction, visible cranes, excavation work, and water bodies within the boundaries. A parking area with numerous vehicles is located near the bottom, and in the background, there are mountains and a mix of residential and recreational areas with open fields and trees in vibrant autumn colors.

A stunning view of Niwot alongside the construction of the plant.

Slab Poured for Dewatering Building

An overhead view of a freshly poured concrete slab at a construction site, still wet from the curing process. The rectangular slab is surrounded by rebar and earthworks, with visible construction materials and equipment nearby. The curing water gives the slab a reflective sheen, while workers and machinery are positioned around the site, indicating active construction progress. Dirt paths and surrounding structures outline the site's boundaries.

The dewatering building's slab has been poured and is currently wet due to the curing process, ensuring that the cement cures properly and doesn't crack.

Oxidation Ditch Takes Shape with Inner Walls Formed and Poured

An overhead view of a circular concrete structure under construction, likely part of the Oxidation Ditch. The inner walls are being formed and reinforced with rebar, with several workers actively engaged in the process. The smooth concrete foundation is already in place, and scaffolding and construction materials are visible around the site. The surrounding area shows dirt paths and construction activity, indicating the ongoing development of this critical structure.

The Oxidation Ditch is taking shape, with its inner walls now being formed and poured. We are pleased with the progress of this structure, as it is a critical component of the treatment process and involves substantial pour sizes.

Headworks Backfilled and Ready for Connection to Manhole and New Sewer Main

Aerial view of a construction site with heavy machinery, including a backhoe and a bulldozer. There is a large rectangular pit with concrete walls being built, and several other smaller structures and pipes are visible. The surrounding area is mostly dirt and gravel.

Our new headworks has been backfilled and is ready to be connected to the manhole and the new pipe for the sewer main.

Headworks Ready for Main Connection, First Main Holes Installed

Aerial view of a construction site with heavy machinery, including an excavator. There is a large rectangular pit with concrete walls being built, and several other smaller structures and pipes are visible. The surrounding area is mostly dirt and gravel.

The headworks is now prepared for connection to the new main. Rice Lake West has also installed the first of the manholes, which will be essential for maintaining the lines.

Final Pour Completed for 2nd Clarifier Walls Ahead of Cold Weather

Aerial view of a construction site showing a circular foundation with wooden formwork in place. The foundation has a central concrete slab with metal rebar protruding. There are several other smaller structures and equipment scattered around the site.

Aerial view of a construction site showing a circular foundation with wooden formwork in place. The foundation has a central concrete slab with metal rebar protruding. There are several other smaller structures and equipment scattered around the site.

Aerial view of a large construction site with multiple circular structures in various stages of completion. The structures have wooden formwork and metal rebar, and there are several pieces of heavy machinery on site. The surrounding area is a mix of farmland and industrial buildings.

These pictures of the second clarifier showcase the hard work of Rice Lake West and JVA, who are striving to complete as much cement work as possible before the onset of cold weather. The clarifier is constructed in sections and is a complex build, requiring precision to achieve a nearly round shape for optimal results. This week, they completed the final pour for the clarifier walls.

A Bird’s Eye View of Plant Construction

Aerial view of a large construction site at a wastewater treatment plant. There are several circular structures in various stages of construction, as well as large rectangular tanks and ponds. Heavy machinery, such as cranes and excavators, are visible on the site. The surrounding area is rural farmland.

This final shot provides an overview of the entire project. We are pleased with the progress being made.

What's next?

Our next steps at Niwot Sanitation include installing the new sewer main along the back of the property. We will also set forms and rebar for the slab above the wet well and main level at the headworks. The Oxidation Ditch will continue to add walls and begin laying rebar and forming the walls for the RAS (Return Activated Sludge) and WAS (Waste Activated Sludge) buildings. Additionally, the dewatering building will have rebar and wall forms installed.

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