Middle-market private equity firm RLJ Equity Partners LLC purchased Olson Brothers Pro-Vac LLC for an undisclosed sum.

Pro-Vac's majority owners before the RLJ buyout were private equity firms Peninsula Capital Partners LLC and Silver Peak Partners, along with key members of the Puyallup, Wash.-based company's management team.

Pro-Vac provides hydroexcavation, storm and sewer maintenance, pipe/line jetting, industrial vacuum cleaning and other specialty services to the infrastructure, municipal and environmental markets in the Pacific Northwest.

Brown Gibbons Lang & Co. was Pro-Vac's exclusive financial adviser in the deal.