"The Seattle-Tacoma International Airport in Seattle, Wash., colloquially known as Sea-Tac, is a major transportation hub for the Puget Sound area and the Pacific Northwest. In 2003, almost 26 million passengers flew from or into Sea-Tac and almost 360,000 metric tons of cargo passed through the airport in transit. Because of the heavy passenger and cargo levels, Sea-Tac is undergoing a major multi–year expansion project—the first for the airport since the late 1960s. The expansion, expected to be completed in 2010, includes construction of a new central terminal, expansion of the south terminal, construction of a new concourse, creation of a third runway, and updating of the satellite underground transportation system and seismic reinforcements throughout the airport. With the amount of ongoing work and the number of improvements in design, conflicts between the contractors’ various projects are a very real possibility. If a contractor is unaware of an obstruction in the design path of a project, the discovery of such an interference results in a change order that requires more time and money than was originally budgeted. To prevent these types of conflicts, accurate as-built maps of the airport were created with the application of both old and new technologies. "
To read more of "As-Built Advances," from POB magazine follow the link to the article.
