Locating Services

Most utilities are located using electromagnetic locators. The equipment consists of two components: a transmitter and receiver used to pick up the signal.

For electromagnetic locating to work, the transmitter must be able to apply a signal to an insulated, metallic cable or pipe. Examples include; telephone, electrical and CATV lines, tracer wires (often buried with plastic or other non-metallic pipes), gas and water metallic pipes, and finally security, fire or lighting systems.

The three methods of Electromagnetic Locating are Conductive, Inductive, and Passive.

direct_connect underground facilities
Conductive / Direct Connection


induction-underground facilities

Ground Penetrating Radar (GPR) records the strength and time radio waves travel through the ground and are reflected off of subsurface “anomalies”. Ideal for detecting both metallic and non-metallic underground utilities, underground storage tanks (USTs), old foundations, trench refraction, and more.


M-Scoping (Metallic-Scoping) allows blind sweeps to be performed to identify subsurface metallic objects. This is especially effective when there are no signs of buried utilities on the surface, as well as for underground storage tanks and utility corridors and rights of way (ROW).

Utility Mapping

Utility Mapping is the process of identifying and recording the location of public and private subsurface utilities, for the purpose of creating and/or updating mapping systems. Combined with ArrowMark’s comprehensive approach, CADD (Computer Aided Design and Drafting) and GIS (Geographic Information System) files/maps can be completed with more than just what’s on the surface, giving peace of mind to the owners, engineer, and contractors.


811 One Call

“Know whats below.  Call before you dig”

An underground utility line is damaged once every six minutes nationwide, according to data collected by Common Ground Alliance (CGA). Digging without knowing the approximate location of underground utilities can result in damage to the utility or property, as well as injury and serious harm to workers or pedestrians nearby. If you or your company own utilities that are underground, registering the location of the subsurface infrastructure with your state’s One Call Center is the start. Having someone to respond to tickets that are placed, indicating that excavation will be occurring near assets you have registered with the One Call Center, is the next step to ensuring compliance and due diligence to protect your assets.

ArrowMark has experienced and knowledgeable staff to provide consulting, ticket management, and field locating for your 811 One Call needs

Additional Services

  • Integrity Assessment
    • High resolution optical imaging (robotic/push)
  • Soft Dig Services/Daylighting
  • Damage Investigation/Incident Reports
  • Veriforce Training / Evaluations

Please feel free to review or download our Certification of Insurance and W9.