Subsurface Utility Engineering.

Three distinct characteristics set us apart from our competitors


SUE is now a requirement on Colorado projects which fall into the following criteria:

Project involves a construction contract with a public entity;

Project involves primarily horizontal construction and does not involve primarily the construction of buildings;

Anticipated excavation footprint that exceeds 2 feet in depth and that is a contiguous 1000 square feet (excluding fencing and signing projects) OR involves utility boring; and

Project requires the design services of a licensed PE.


Ensuring the foundation of a project is off to a good start means saving money down the road.


Safer projects – with less potential for utility exposure

Prevents unexpected utility relocations

Minimizes service interruption and utility outages

Minimizes schedule delays



Clark staff are qualified and currently providing SUE services in accordance with ASCE CI-38-02.

Quality Level D: Record Research/Data Collection

Records research and oral history is where the information on this level comes from. This D level of service is the most basic of services.


Quality Level C: Visible Surface Feature Utility Survey

Level C consists of surveying visible above ground utilities.


Quality Level B: Utility Designation

Use of appropriate geophysical methods to determine the existence and horizontal position of subsurface utilities called ‘designating’.


Quality Level A: Underground Utility Locating (Test Hole)

This is highest level, precise mapping through exposure of utility; provides type, size, condition, and material and is called ‘locating’ Test Holes.

Click to see sample Subsurface Utility Engineering drawing.

Full Service SUE.

Clark provides in-house HydroVac services.  This gives us the ability to provide Test Holes for ASCE 38-02 Quality Level A specifications throughout Colorado. In compliance with Colorado Revised Statue 9-1.5-101 (SB 18-167).



Professional Surveying and Mapping Services

Utility Designation Services, ASCE 38-02 Quality Level B

Test Hole Services (Pot Holing), ASCE 38-02 Quality Level A

SUE Professional Engineering Services


Who, Where, Why.

"GreenbergFarrow has valued our partnership with Clark Land Surveying for over five years.  We find that Clark’s reliability, responsiveness and quality provide best in class service.  The single point of contact approach makes doing business with Clark easy and seamless.  We look forward to continuing our relationship with Clark Land Surveying in the future."

~ Rod Abney, Jr, Chief Financial Officer, Greenberg Farrow

Clark staff are qualified in providing SUE services in accordance with ASCE 38-02.

Utility Project Life Cycle.