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.
In the United States, the average size of new single family homes grew from 1,780 square feet (165 m2) in 1978 to 2,479 square feet (230.3 m2) in 2007, and to 2,662 square feet (247.3 m2) in 2013, despite a decrease in the size of the average family. Reasons for this include increased material wealth and prestige.