Gas Chromatography-Mass Spectrometry (GC/MS) As It Relates To Urine Drug Testing. Gas Chromatography-Mass Spectrometry (or GC/MS) is a two-step methodology used to identify different substances within a test sample. GC/MS is widely used due to its ability to perform a specific test, and is an extremely effective in identifying the presence of a specific substance within a given sample.
(name). (email). To: (email). The Gateway Arch, 630 feet tall and another 630 feet wide, is an elegant frame to the historic city of St. Louis. A gigantic endeavor in its time, the arch is almost 100 feet taller than the Washington Monument and more than twice the height of the Statue of Liberty.
Construction of the Gateway Arch began on February 12th, 1963 and was completed on October 28th, 1965. Once completed, the Arch stands at 630 feet tall and 630 feet wide at the base, which makes it the tallest land monument in the United States. On July 14th, 1967, the doors to the Gateway Arch were opened to the public for the first time.