Subsurface Utility Engineering

An important element when designing projects is to identify and locate the existing underground utilities. Utility Designating entails locating and marking of underground utilities based on thorough research of utility company records within job limits. Utility records are reviewed and compiled to prepare in house plans for systematic designating of underground utilities within project limits. Once the utility designating is reviewed by the engineering staff, Utility Locating is provided using air-vacuum excavation to expose the entire utility. 

JMT has full in-house subsurface utility locating and designating resources to enable our clients to locate utilities at the onset of any project.   Locating utilities early in the design process accomplishes the following:

  • eliminates costly conflicts in design
  • eliminates delays in design and construction

Eliminating conflicts and delays can result in tremendous cost savings.  Our designating phase involves using geophysical prospecting techniques, including electromagnetic, magnetic, and resistivity methods to horizontally locate utilities.  The designating is then surveyed and plotted, and in areas where conflicts exist, utility locating is performed using one of our four (4) air-vacuum excavation trucks. Once the utility is exposed, the top of utility elevation is surveyed, and the following information is obtained: horizontal and vertical (top and bottom) location,; elevation of existing grade over utility,; outside diameter; type; paving thickness (or other surface covering thickness); and overall condition. A color-coded tape is placed in the hole with a permanent surface marker over the centerline of the utility. The test hole is backfilled with the excavated material, and the surface is restored and patched to client specifications. Backfill material is tamped in lifts with a pneumatic tamper assuring maximum compaction.

JMT supports numerous public and private clients in the location of underground utilities. Our utility designating and locating group is cross trained with our surveying group, which allows for the surveying of the utilities to be completed in most cases by the utility crew. There is no waiting for the data, and we can deliver design files in AutoCAD and Microstation format.

Projects

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Owings Mills Boulevard Southern Extension

JMT designed a 2-mile-long new roadway extension through an existing residential community while avoiding sensitive environmental features.

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SSA Child Care Center Playground Design

JMT provided design services for the site work and utilities associated with child care center playground improvements.

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Penn State SUE

JMT provided Subsurface Utility Engineering and topographic surveys in support of a university campus utility mapping project.

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9th Street Bridge Replacement

JMT was the lead designer for the Contractor of this challenging $51 million design-build project, which serves as a gateway to our Nation's Capital.

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Fairfax County Pkwy Extension, Phases I II & IV

JMT served as lead designer for a major design-build roadway project as part of the BRAC program.

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Subsurface Utility Designating, Locating & Plotting Services

JMT provided complete subsurface utility designating, locating (test pits) and plotting services, statewide

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US 301 Spur, Section 4

JMT provided a variety of surveying and SUE services in support of a new, four-mile long roadway project.

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Surveying, Photogrammetry & SUE Services

The Spectra Group, a JMT Company, provided Subsurface Utility Engineering (SUE) services to VDOT as a subconsultant to Rice Associates on an as-needed basis throughout the State of Virginia.

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