Mayo Colonial Building Demo

Project Details

Client: Mayo Clinic Foundation
Location: Rochester, MN
Services: Demolition


Bolander was selected by the Mayo Clinic Foundation to perform the complete Building Demolition of the 7 story Colonial Building. The Colonial Building was one of the first original Mayo buildings in Rochester. The location of this project is at the heart of Rochester and Mayo Clinic.

Once complete, the new Mayo Proton building will take its place. This will be a 110,000 Square-foot expansion for Proton radiotherapy which is a more technically advanced cancer treatment.

The most technical aspect of this project is working alongside multiple other projects taking place, in this crowded working area. These projects being the first avenue tunnel expansion and the new Mayo Logistics building. Also, we are working alongside the active Eisenberg building which is a major MRI and surgery wing of the Mayo Clinic.




Project Details

Client: Ramsey County
Location: Arden Hills, MN
Services: Building Demolition, Excavation


The Twin Cities Army Ammunition Plant (TCAAP) is a former US Army ammunition plant built in the 1940’s to support World War II.  At one point this area employed over 20,000 people producing small caliber rounds.  After supporting the war it was eventually mothballed, redevelopment proved difficult due to extensive environmental pollution despite a few partial remediation efforts.

The full clean-up effort was completed by Bolander between 2013 to 2016 for Ramsey County.  Work was completed under a Contractor-At-Risk contract for demolition and remediation.  Atypical for environmental remediation, this contract put Bolander and our partner, Wenck, at risk for all overruns on known area of contamination for the site.  As part of the county’s purchase agreement, the US Army maintained liability for any unknown areas of contamination.  This unique contract structure allowed financing to move forward, eliminating concerns of overruns on this high risk scope of work.

All demolition and work has been completed. In 2015, Bolander was recognized for this effort by the National Demolition Association in winning the Environmental Excellence Award.  Bolander received the Certificate of Completion form in 2016 from the Minnesota Pollution Control Agency, clearing the way for the redevelopment and delisting this portion of TCAAP as an EPA superfund site.

Bolander’s significant environmental remediation of the site included removal of the following items:

  • 140,000 tons soil removed
  • 8,000 ton of PCB impacted soil removed.
  • 3,000 ton PCB impacted concrete removed
  • Mercury impacted concrete and drains
  • 29,000 ft of Asbestos piping
  • Regulated Waste
  • Asbestos Window Glazing, caulking, pipe wrap

Demolition of site included the following:

  • 22 remaining structures and foundations
  • 6 building foundations
  • 40,000 lf storm sewer
  • 38,000 lf sanitary sewer
  • 50,000 lf water main
  • 42,000 lf fence
  • 37,000 lf gas main

The extensive nature of the site and existing infrastructure allowed Bolander to conduct a massive recycling and salvage operation. 93% of the materials removed from the site were recycled or reused in new roadways there and in other parts of the Twin Cities.  An estimated 13,000-plus tons of steel and more than 400,000 tons of concrete and asphalt were recycled and reused, along with Crumpled steel girders, bails of rebar, mounds of misshapen concrete chunks, stacks of 2x12s and thick Douglas fir timbers.

Abbott Northwestern Central Utility Plant

Project Details

Client: JE Dunn
Location: Minneapolis, MN
Services: Building Demolition, Earth Retention, Excavation, Site Utilities


In the spring of 2021, JE Dunn awarded Bolander the site work construction for the Abbott Northwestern Central Utility project. Once awarded, we worked closely with the client on the high-level planning required to execute this complicated project. Bolander’s work consists of Building Demolition, Earth Retention, Excavation & Site Utilities.

Located on the corner of Chicago Avenue and East 26th Street, the new Central Utility Plant will replace the hospital’s outdated energy and steam-producing equipment with more reliable and energy-efficient technology. The hospital currently relies on steam and energy equipment dating back to 1956.

The project started with the demolition of the existing Harriet Walker and the Education buildings. Standing 6-Stories tall, the Harriet Walker building was a perfect opportunity to utilize the Liebherr R960 High-Reach Demolition Excavator. This machine has multiple configurations and the ability to reach 108’!

The Earth Retention portion of our work includes drill & set H-Pile and lagging, tie-backs, internal bracing, as well as soil solidification. Given the proximity to existing structures that are to remain intact as well as active medical facilities, vibration was a significant concern. Bolander worked with our engineering consultant to develop a plan to alleviate these concerns.

This project shows our ability to coordinate and collaborate with the general contractor as well as the other project partners and stakeholders.

Essentia Hospital – Vision Northland


Project Details

Client: McGough Construction
Location: Duluth, MN
Services: Building Demolition, Earth Retention, Excavation, Site Utilities


Essentia has been an exciting project with its success rooted in our partnership with Northland Constructors of Duluth. Starting in 2019, Northland took the lead on excavation and utilities while Bolander began demolition, deep foundations and earth retention.

The demolition has been unique to both the client and the structure involved.

“Essentia is an active hospital,” explained Evan Mackey, Demolition Division Manager, “Bolander worked closely with the general contractor and Essentia to implement means and methods that reduced noise, dust and vibration to mitigate impact to sensitive medical equipment, patients and pedestrian traffic.” Additionally, Bolander crews worked on demolition of a post-tension parking ramp. This included de-tensioned and re-tensioned structural cables.  Demolition crews also dismantled two existing skyways.

Foundation crews had to account for topographical challenges, as the site drop 110’ towards the shore of Lake Superior. Their work included five separate earth retention systems retaining as much as 62 vertical feet of rock and soil.  To maintain the aggressive schedule, our crews showed true commitment working long hours and even drilling through Thanksgiving weekend. Furthermore, Bolander drilled 100 foundation rock anchors and is scheduled to install 32 drilled piers.

Essentia has been an exciting project where Bolander, with our talented leadership and crews, overcame several obstacles to complete our scope of work safely and on time.  This project has sparked a great relationship with Northland Constructors which will lead to more opportunities for us in the Duluth market.

The Abbey

Project Details

Client: Yellow Tree Construction
Location: Minneapolis, MN
Services: Building Demolition, Earth Retention, Excavation, Site Utilities


In the Fall of 2020, Bolander was awarded the Yellow Tree project, The Abbey, consisting of building demolition, excavation, and underground utilities in preparation for a new apartment building.

This project began with the separation and demolition of an addition to the original H. Alden Smith mansion in the Loring Park neighborhood in Minneapolis.

Given the mansion’s status on the National Register of Historic Places, the building separation required the highest level of protection and attention to quality. Much to the delight of our client, our talented demolition crew members executed this surgical building separation without incident.

After demolition was complete, Bolander began the task of excavating for the new apartment building foundation. Early on in the excavation phase, Bolander crews discovered a great deal of unforeseen buried building elements as well as contaminated soils. The contaminated and debris laden soils required landfill disposal.

The underground utility scope of this project consisted of a water main service, sanitary sewer service and storm sewer work. This work included three street connections.

The Abbey was a challenging project that folded together several of the services in which Bolander provides. This was yet another prime example displaying how Bolander overcomes project obstacles by working together.