You Can Be Confidant When It Comes to Subsurface Utilities!

Protect your stamp and your company. With a detailed investigation and a deliverable that consist of much more than a sketch, you have somthing to pass along to your client as a basis of whats plotted including all of our research (QL D.) We carry our own professional liability policy. Our service is more than just "adding utilities."

How SUI Was Founded

Alex Whitten, the founder of Subsurface Utility Investigations, started his career as a Land Surveyor. He became quite passionate about Subsurface Utility Engineering. The SUE process greatly reduces the risk of damage at the time of construction, helps to keep a project on schedule during construction, saves time in the design process, and saves the project money.  He believes in the standards laid out in ASCE 38.02. He feels the most economical and precise way to produce those standards is by deploying the services of Subsurface Utility Investigations, LLC before or at the same time that a boundary/ topographic survey is being done.  The demand for this service has already begun and Subsurface Utility Investigations, LLC is on the cutting edge with competitive pricing and delivering a tailored service to Land surveyors that is second to none!

The Quality Levels of SUE

ASCE 38.02 Quality Levels:


Information derived from existing records or oral recollections.


Subsurface Utility Investigations, LLC does a grid search around your project to identify all utility owners and has the knowledge and education to contact the owners. We request and obtain the proprietary information on their facilities (overhead & underground) within the limits of your project.


Information obtained by surveying and plotting visible above-ground utility features and by using professional judgment in correlating this information to quality level D information.


Traditionaly QL D was completed by the engineering firm. Surveyors have been locating above ground utility features for years (QL C.)


Information obtained through the application of appropriate surface geophysical methods to determine the existence and approximate horizontal position of subsurface utilities. Quality level B data should be reproducible by surface geophysics at any point of their depiction. This information is surveyed to applicable tolerances defined by the project and reduced onto plan documents.


Our detailed investigation on QL D and our application of precise designation and marking of all utilities will yeild a detailed report of material types, sizes, pressure levels and all other findings along with a detailed sketch. We believe only a Professional Land Surveyor can plot our findings to the applicable project tolerances. In the private sector of design this being completed by the project surveyor will save time and money.


Precise horizontal and vertical location of utilities obtained by the actual exposure (or verification of previously exposed and surveyed utilities) and subsequent measurement of subsurface utilities, usually at a specific point. Minimally intrusive excavation equipment is typically used to minimize the potential for utility damage. A precise horizontal and vertical location, as well as other utility attributes, is shown on plan documents. Accuracy is typically set to 15-mm vertical and to applicable horizontal survey and mapping accuracy as defined or expected by the project owner.


Typically this quality level is performed mid-design when a potential conflict needs to be investigated further. It's quite often that this quality level doesn't need to be deployed at all, but there are several cases where it does.  At Subsurface Utility Investigations we will work with you to get this done in a fast and cost effective manner.

ALTA/ACSM Table A, Item 11b

Observed evidence together with evidence from plans obtained from utility companies
or provided by client, and markings by utility companies and other appropriate sources 
(with reference as to the source of information).

  • Railroad tracks, spurs and sidings;
  • Manholes, catch basins, valve vaults and other surface indications of subterranean uses;
  • Wires and cables (including their function, if readily identifiable) crossing the surveyed property, and all poles on or within ten feet of the surveyed property. Without expressing a legal opinion as to the ownership or nature of the potential encroachment, the dimensions of all encroaching utility pole crossmembers or overhangs; and
  • Utility company installations on the surveyed property.

Note - With regard to Table A, item 11(b), source information from plans and markings will be combined with observed evidence of utilities to develop a view of those underground utilities. However, lacking excavation, the exact location of underground

features cannot be accurately, completely and reliably depicted. Where additional or more detailed information is required, the client is advised that excavation may be necessary.


The interpretation of this item has been a topic of discussion for many surveying firms. If you and/or your clients interpretation is to exhaust resources and go ahead with having all the underground utilities marked, we are here to provide that service at a competitive price. Subsurface Utility Investigations, LLC will not cut corners and will deploy QL D and QL B as described above. We will provide a detailed report of the findings, detailed sketches and physical markings on the ground that will be easily interpreted. We think you will be highly impressed by the price and quality of work that Subsurface Utility Investigations provides in this area!

Contact Information:

Subsurface Utility Investigations
Phone: 770 557 4142

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