In 1958 Ross Karlson, having just graduated in engineering started with Riverside Construction in London Ontario. By 1972 he worked himself up to Vice President of the company with a stake in ownership of the company. In 1973 Riverside Construction was sold to TCG Materials, where Ross went on to become Senior Vice President until his retirement from the company in 1994.
In 1984 Tory Karlson, the son of Ross joined TCG Materials in the Marketing division of the company. From 1984 until 1989 he worked himself into a management position. One of his clients was Ronson Paving & Construction, which was formed in 1984. Tory realized the potential in this young company and in 1989 purchased Ronson Paving.