Content on this page requires a newer version of Adobe Flash Player.

Get Adobe Flash player

EnviroPhysics, Inc.
Utility Detection/Screening Surveys
Many underground utilities can be detected geophysically. This includes water lines, gas lines, sewer force mains, electric lines and some storm sewers. Success is improved when the utility is shallow and made of metal, but many non-metallic utilities can also be detected if the site conditions are favorable. Deeply buried and/or non-metallic utilities may not always be detected.

A utility survey usually begins with the use of line tracing equipment designed to put a radio-frequency signal on to the metal utility. A specially tuned radio receiver is then used to trace the signal along the utility.
Utility location job in Camden, NJ
Passive line tracing equipment is also used. This approach takes advantage of the 60-cycle fields coming from electric lines and the very low frequency signals re-radiated (by metal utlities) from the US navy transmissions to its submarine fleet.
This equipment is used to locate and trace all types of buried or concealed conductors such as: pipe, cable, tracer wire, trace-able fiber optics, or even sewer snakes or fish tape inserted into non-conductive pipe. The 800-H has an audible response as well as a visual response to help verify the locate and to help give an estimated depth.
Pipehorn 800-H
The LS 990 is comprised of a transmitter and a receiver used for locating buried, electrically conductive pipes/cables. The transmitter is connected to one end of a conductor and the receiver is able to locate and follow that conductor above ground. The unit will also, identify the conductor's depth. A transmitter clamp can be used around electrical cables to avoid direct contact. This unit will not locate plastic piping. Asphalt and concrete are not interfering obstacles.
Heath LS-990
The new RD4000 Location System is much more than a Web-enabled locator. Using a new generation of technology it leapfrogs all others not just in features but in performance and ease of use. The RD4000 is the most cost effective method of locating buried services be it Gas/Electric/Telecom/Water/ Sewer/CATV.
Radiodetection RD-4000
Designed for production locating, the Metrotech 9800 Series exhibits enhanced sensitivity and uncomplicated line identification unlike any other locator in the field today. The 9800 Series is the only advanced locator available with both "Real-Time Continuous Gain Adjustment" and "Manual Gain Control" which greatly widens the range of the instrument for enhanced productivity and faster more reliable response. Locator professionals can take control of all of their locates with the rugged and highly accurate 9800 Series.
Metrotech 9800
If the site conditions allow for it, a full electromagnetic conductivity may also be done at a site to help detect non-metallic utilities. Metal detection may also be used to help locate steel piping in areas where the ground-penetrating radar signal cannot go deep enough (usually areas of clay and/or high water table).

Where the utility mapping is not needed, many of these techniques can be used to help "screen" a proposed soil boring location to help avoid damage to utilities. EnviroPhysics, Inc. always uses atleast four geophysical methods to screen for utilities, and up to seven may be used at a site if needed.
EM Survey data showing storm sewers and areas of buried metal.