Frequently Asked Questions
1. What is Utility Engineering?
2. What is a Utility Coordinator?
3. What is Subsurface Utility Engineering?
4. What major activities are involved in Subsurface Utility Engineering?
Major SUE activities are:
Scope of Work – The process of developing a written project-specific work plan package that consists of scope of work, levels of service vs. risk allocation, project schedule and desired project delivery method. The SUE work plan package is agreed upon by the SUE provider and the client, describing the SUE work to be performed.
Designating – The process of using a surface geophysical method or methods to interpret the presence of a subsurface utility and mark its approximate horizontal position on the ground surface or on above-ground surface markers.
Locating – The process of exposing and recording the precise vertical and horizontal location and providing utility size and configuration of a utility.
Data Management – The process of surveying, designating and locating information to project control and transferring it into the client’s CADD system, GIS files, or project plans.
Conflict Analysis – The engineering process of using a conflict matrix to evaluate and compare depicted designating information with proposed plans (highway, bridge, drainage, and other) in order to inform all stakeholders of potential conflicts, potential resolutions and costs to cure.
5. How does SUE work?
6. What are the benefits of using SUE?
SUE provides many benefits. Proper use of this cost-effective professional engineering service will eliminate many of the utility problems typically encountered on projects, including:
- Delays to projects caused by waiting for utility relocation work to be completed so construction can begin;
- Delays to projects caused by redesign when construction cannot follow the original design due to unexpected utility conflicts;
- Delays to contractors during construction caused by cutting, damaging, or discovering utility lines that were not known to be there;
- Claims by contractors for delays resulting from unexpected encounters with utilities; and
- Deaths, injuries, property damage, and releases of product into the environment caused by cutting utility lines that were not known to be there.
7. Are there any standards of care for the use of Subsurface Utility Engineering?
The American Society of Civil Engineers (ASCE) has developed an important standard of care guideline, Standard Guideline for the Collection and Depiction of Existing Subsurface Utility Data, CI/ASCE 38-02. This standard guideline describes four quality levels of utility depiction:
Quality Level D – Information derived from existing records or oral recollections.
Quality Level C – Information obtained by surveying and plotting visible above-ground utility features and by using professional judgement in correlating this information to Quality Level D.
Quality Level B – Information obtained through the application of appropriate surface geophysical techniques to determine the existence and approximate horizontal position of subsurface utilities.
Quality Level A – Information obtained by exposing and measuring the precise horizontal and vertical position of a utility at a specific point.
8. What is the difference between the ASCE 38-02 Standard and the new CSA S250 Standard?
Generally speaking, ASCE 38-02 sets out guidelines for how to qualify the accuracy of mapping existing infrastructure and relay that information to a drawing. ASCE goes into the SUE process and roles and responsibilities of the SUE professional and the owner. It’s more prescriptive.
CSA S250 sets out requirements for classifying the accuracy of newly installed or exposed infrastructure. The CSA S250 accuracy levels are an expansion of the ASCE 38-02 Quality Level A, providing a finer level of detail to define the positional location of the infrastructure which translates into a better defined reliability in the accuracy of the record.
9. Where can copies of the ASCE standard guideline (ASCE 38-02) be obtained?
Copies of ASCE Standard 38-02 can be obtained from the ASCE Bookstore or by calling 1-800-548-2723.
10. What qualifications should a provider of SUE services have to do the work properly?
It is recommended that project owners consider the following, not necessarily all-inclusive criteria, when selecting a SUE provider. Providers of SUE services should be able to:
- Demonstrate a thorough knowledge and understanding of designating, locating, and data management activities.
- Provide designating and locating services to the extent desired by the contracting agency.
- Survey SUE data acquired during the designating and locating phases to project control and transfer it into the contracting agency’s CADD system, GIS files, or project plans.
- Individuals assigned by the SUE provider to carry out the work should be well trained, experienced, and capable.
- Individuals in charge of the work are responsible for certifying deliverables and should be engineers employed by the SUE provider in accordance with provincial professional registration requirements.
- The project manager should have previously been involved in the management of one or more SUE contracts and must be available to commit sufficient time to the project. Resources of the provider should be adequate to carry out the SUE work in a timely manner, considering other possible commitments of work and the contracting agency’s anticipated needs, including a possible need for work on several projects to take place simultaneously.
- Other team members should have previously been involved in SUE designating, locating, surveying, and/or mapping activities.
- A wide range of equipment is necessary to detect the variety of underground utilities that may be present. Equipment available for utilization by the provider should include, but not be limited to, the following:
- ELF, VLF, LF electromagnetics, magnetometers, terrain conductivity meters, resonant sonics, and other geophysical designating equipment,
- Vacuum excavation or comparable nondestructive locating equipment,
- State-of-the-art surveying and data recording equipment, Software systems compatible with the contracting agency’s CADD system.
Providers of SUE should have: The financial capacity to provide the required services, measures of protection for the contracting agency against errors and omissions of data collection, interpretation, and management.
Providers of SUE services should be able to provide: Vertical data accurate to within ± 15 mm (0.05 ft), horizontal data accurate to applicable survey standards.
Providers of SUE services should: Carry adequate insurance covering all aspects of the work. Minimum amounts should be in accordance with the contracting agency’s requirements.