Arabtec Construction, the UAEÔÇÖs largest contractor by market value, has started groundwork on its first building project in Saudi Arabia, according to chairman Riad Kamal.Excavating started last week on a development in Riyadh, while the company was already seeking further opportunities for contracts in the country, Kamal said in an interview. ┬á┬áArabtec Construction, a subsidiary of Arabtec Holding, is eager to tap growth opportunities in the GulfÔÇÖs largest economy as Dubai's property sector slows.