Guidelines for Trenchless Installation

The following documentation shall be submitted with an Individual Permit Application through the Construction Permit System (CPS).

Note:  An annual permit allows trenchless installation for facilities with a diameter of 3 inches or less to be performed without submitting the following requirements.

A plan sealed by a licensed professional engineer- drawn to scale indicating:

  • Specific location, distance, to the nearest crossroad, the city, township, section, town, range and county.
  • Length, bearing, size and material type of casing and/or carrier pipe.
  • The location of state highway Right-of-Way boundaries by measuring to the centerline of the roadway. 
  • The location and dimensions of all existing MDOT facilities, sidewalks, roadways, buildings, signals, poles, private or public utilities, and all other facilities that may affect or influence the underground facility design and construction. 
  • Ingress and egress plan is also required.
  • The location and dimensions of soil borings, access pits (including pit dimensions), ground supports, installation equipment, pipe-layout, supplies, staging and/or storage area. 
  • A dewatering plan and layout, if applicable, will be required.

Pipe profile views- drawn to scale indicating:

  • The depth, length, cover, and grade of the pipe; by dimensionally referencing curb and gutter, shoulders, roadway surface, ground, and all other subsurface facilities or utilities located above or below the centerline of the pipe.
  • The depth and dimensions of access pits, sheet piling or other ground supports and installation equipment.

Specifications and/or documentation- for the items listed below (depending on project complexity):

  • Qualifications and contact information of the project superintendent and operators.
  • Utility Status Report that certifies all private and public utility companies, owning facilities located within the area of influence of the proposed activity were consulted and that each utility's location, bearing, grade, depth, and diameter is accurately represented on the plans and profiles.
  • Geotechnical information - including soil reports, and soil boring information.
  • Casing and/or carrier pipe information- including material type, material class, yield strength, allowable pipe pulling or jacking force, diameter, and wall thickness.
  • Overcut diameter, and/or backream diameter increase.
  • Casing blocking, chocks or spacer material, and spacing.
  • Pipe material certifications.
  • Pipe joining method, including joint gasket and/or cushion details.
  • Leak test methods and certification.
  • Ground movement monitoring method.
  • Continuous monitoring records information.
  • Construction staging.
  • Make, model, and operational characteristics of trenchless equipment.
  • Grade and alignment control system.
  • Lubrication system and method.
  • Grouting or capping method.
  • Control, treatment, and disposal of slurry water and soil.
  • Temporary pipe bypass layout and pump capacity.
  • Dewatering operation plan.