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Title: Geophysics For Utility Location: When It Works-When It Wont
Author: Bernard H. Hertlein
Source: American Gas Association 1998
Year Published: 1998
Abstract: The location of buried utility lines is often poorly documented. The lateral position of the lines may be known with reasonable accuracy, but the burial depth may be uncertain due to changes in grade caused by construction or maintenance after the pipes were buried. Where mechanical equipment is used, an undocumented utility line can easily be damaged before it is observed by excavation workers. Gas and electricity lines present very obvious safety threats in this situation.

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