Big Stone Power Plant

Big Stone Power Plant


Big Stone City, Grant County, SD

Construction Cost


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Otter Tail Power Company was required by the EPA to implement a plan to reduce emissions in compliance with Best Available Retrofit Technology (BART) guidelines. In the planning phase of the $490-million project, Otter Tail hired Banner to complete a topographical survey of the Big Stone Power Plant Site. The survey was needed so designers had an accurate representation of existing site conditions. Upon design completion, Otter Tail enlisted Banner to provide third party QA/QC services during construction. Banner provided random checks on the contractor and contractor's surveyor to ensure construction was in conformance with the plans. This successful project was completed more than a year ahead of schedule and 21% under budget.

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Project Goal #1

Provide an accurate model of existing site and structure  

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Project Goal #2

Establish a coordinate system with local and SD state plane values which included setting eight new permanent control monuments to NGS standards

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Project Goal #3

Capture accurate as-built measurements on existing plant structural members at critical tie in areas

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Project Goal #4

Provide the owner with QA/QC surveying services to helped to avoid errors in layout during construction

Project Features

  • Topographic Survey
  • GPS Static Network
  • Control Levels to NGS Monuments
  • Permanent Monument Construction
  • Unique Methods to Obtain As-Built information
  • Staking Calculations
  • Monitoring and Reporting

Services Provided

  • Total Station Survey
  • GPS Survey
  • Digital Level Loop
  • GPS Static Survey
  • Horizontal Traverse
  • Structure Monitoring
  • Coordinate calculations and computation
  • Drafting
  • Field notes and documentation

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