Williams Transco Central Penn Line South. Williams Transco Central Penn Line South. Unlike liquid petroleum product pipelines, where the main risk is a leak leading to contamination of water and soil, the main risk with a high-pressure natural gas pipeline is a rupture and ensuing fire.
The White House today holds 142 rooms on six floors, the floor space totaling approximately 55,000 square feet. It has hosted longstanding traditions such as the annual Easter Egg Roll, as well as historic events like the 1987 nuclear arms treaty with Russia.
Known as the official residence of the U.S. President, the White House is exactly situated at 1600 Pennsylvania NW in Washington, D.C. The late President George Washington proposed the construction of the house and he chose the place where the mansion was built. Architect James Hoban made a floor plan for the house an it was approved by by the Congress in 1792.