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Hector-Ajax Pipeline Construction Surveying


As a subcontractor to Bartlett & West, our survey crews assisted Marathon Oil and Tesoro Corporation with surveying tasks necessary for the construction of the Hector-Ajax Water Pipeline System and the Connolly Oil Gathering System located in Dunn County, North Dakota.

The surveying assignments that our firm assisted with include the following:

  • Topographic survey of the existing conditions for the pipeline route, with all marked underground utilities being located, above ground utilities, road crossings, fences, and wetland crossings.
  • Staking of the proposed 100’ right-of-way, oil and salt water centerlines with 25’ foot minimum separations staked at 200 foot intervals, and all points of intersections or line of sight for the 130 mile route.
  • Cataloging oil pipe heat numbers, x-ray numbers, pipe lengths, pipe numbers, segmented fittings, pipe sizes, pipe cover depths and field bends using both hand written catalog sheets and Trimble TCS2 data collectors, as well as using the data dictionary attributes entries collected during the as-built survey. Data was collected at each weld seam and any fabricated or field bends (ie: over bends, under bends, right or left bends).
  • Located 150 sections corners in nine different townships which were used in the creation of utility easement plats.
  • Staked horizontal direction boring locations at road, river and wetland crossings.
  • Routed reconnaissance topographic surveys for reroutes.
  • As-built data collection for both the salt water and oil pipelines. On average each pipe segment length was 40 linear feet.  Data collected for the water distribution system was collected at 100 foot intervals and at each coupling.
  • On call staking to replace construction stakes that were destroyed by cattle or that needed to be replaced due to the confined work space during the construction of the pipelines.
  • Assisted the pipeline inspectors with quality control of the pipeline ensuring that all minimum pipeline spacing and depths of cover were met.
  • Collected the final topographic as-built surface data following construction.
View Related Projects:
Construction Staking, Surveying, Topographic Surveys