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== Background ==*Most pipeline explosions occur when construction crews accidentally cut into a line.Source: http://abc7news.com/archive/7661806/Natural-gas-transmission pipelines are not routinely fully disclosed to residents. Security concerns are part of the reason that exact line details are not widely publicized. High-strength steel pipes, often as wide as a large truck tire, transport natural gas at up to 1,400 pounds per square inch, a pressure roughly equivalent to the weight of five passenger cars. Some run just three feet underground in dense urban and industrial areas. Over the years, pipeline breaks have killed dozens of people and resulted in millions of dollars in damage to property. On Dec. 24, 2008, a gas leak in a small pipe caused an explosion that killed one person and injured five in Rancho Cordova California. In the past 20 years, federal officials tallied 2,840 significant gas-pipeline accidents nationwide, including 992 in which someone was killed or required hospitalization, according to the Pipeline and Hazardous Materials Safety Administration. Those accidents killed 323 people and injured 1,372. Once a high-pressure pipeline fails anything can trigger a deadly blast such as a cigarette or rocks smashing as high-pressure gas shoots by. Source: http://www.seattletimes.com/nation-world/with-gas-lines-a-danger-lurks-underground/== Resources ==* The [http://www.npms.phmsa.dot.gov/ National Pipeline Mapping System]* Forum, Buying a House, [http://ths.gardenweb.com/discussions/2566308/need-advice-gas-lines-behind-the-house Need advice - Gas lines behind the house]