1924 - Carl Bolander & Sons Co. founded by Swedish immigrant Carl Bolander, specializing in grading and excavating.

1941 - Carl retires and Ivar Bolander becomes the second president, and adds pile driving to the type of work performed.  Hires son, David, to work at the company.

1961 - Ivar hands the business over to his son, David, who becomes third generation president.

1979 - Carl Bolander & Sons Co. was involved in the first implosion located in Minneapolis.

1980’s - Begin soil remediation, landfill closure, underground storage tank removal, and waste control projects.

1994 - After 32 years, David hands the presidency of the company over to his son, Bruce. 

2001 - Mark Ryan takes over as President and Chief Operating Officer.

2005 - Mark Ryan and Rick O'Gara complete the purchase and become owners of Carl Bolander &    Sons and SKB Environmental