Mott MacDonald’s North American company, Hatch Mott MacDonald, has acquired Richard P Arber Associates based in Lakewood, Colorado and Gibson Engineers PC from Fuquay-Varina, North Carolina. Richard P Arber Associates focuses on water, wastewater, and water reuse engineering services and will support Hatch Mott MacDonald’s services in the western USA. Gibson Engineers specialise in transportation infrastructure and will strengthen Hatch Mott MacDonald’s transportation engineering practice in the south-eastern states, where the firm has an established water, wastewater and transportation practice.