Encouraging Innovation in Locating and Characterizing Underground Utilities (2009) / Chapter Skim
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Pages 114-127
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114A P P E N D I X B Case HistoriesThe following case studies were obtained through discussion with practicing professionals, a literature search, a survey of subsurface utility engineering (SUE) projects conducted by the TBE Group Inc., and a research report released by the University of Toronto.
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115To overcome these shortcomings, the Federal Aviation Administration (FAA) adopted an innovative radio frequency identifiers (RFID)
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116large unmarked underground hydro tunnel was found to cross the proposed alignment of the new water main. Among the other unmarked utilities that were identified and that had potential to cause construction delays and cost increases were abandoned gas mains and a phone duct structure.
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117comprehensive SUE investigation. A quality level B designated investigation was conducted along the proposed alignment for designating gas, electrical, and telecommunications utilities.
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118Case Study No. 15: London, Ontario, Canada A new sanitary sewer system was needed to replace a 60-year old combined sanitary/storm system beneath King Street in downtown London, a major city in southern Ontario.
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119netic field data are typically collected on a 1-ft × 1-ft grid spacing over the entire survey area. The position of the AIR system is tracked using an accurate positioning system such as a robotic laser tracking system that provides centimeter position accuracies.
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120utility search and trace techniques were used to identify metallic and nonmetallic utilities. This project was exceptional because of the necessary coordination with several railroads that crisscrossed the area.
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121frequencies and power were tightly controlled and coordinated with the base munitions officer. Specific pipe and cable locators with acceptable frequencies, magnetic tools, insertion techniques, terrain conductivity, and elastic wave techniques were used, along with specific discrete area coupling methods.
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122heavily congested primary roadway. Traffic-control requirements were significant and, whenever possible, several utilities were documented in a single test hole.
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123Case Study No. 41: Delaware DOT, S
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124dated two levels of permits. For projects less than 500 ft, the applicants are required to pothole every 100 ft on either side of the proposed new utility as well as at line crossing.
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125The SUE firm found that the utility-marked plans were wrong. The quality level B SUE investigation was conducted using electromagnetic equipment along with close coordination with the utilities.
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126Case Study No. 55: SR 0015-077, Pennsylvania DOT Engineering District 3-0, Montoursville The Market St.
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127Case Study No. 59: SR 0865-002, Pennsylvania DOT Engineering District 9-0, Hollidaysburg The Bellwood Road and Bridge, Blair County, project involved relocation of a roadway and reconstruction of a bridge in the rural area of Bellwood.
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