Master Locators provided utility locating services at the Malvern Prep School. The private school was renovating the campus and we visited a few different sites to locate utilities for the purpose of excavation for stormwater installation. Our service technicians used ground penetrating radar (GPR) and electromagnetic scanning (EM) to complete this project.
How We Did It
Using our standard seven steps of locating, our technicians used three different pieces of equipment to mark out all locatable utilities. The first site was a parking lot along the Malvern Prep campus. We used GPR and EM scanning to locate several different utility lines including site lighting electric, storm, sanitary and two unknown lines. Only the water lines running through the scope of work were unlocatable.
The second area we scanned was outside of the buildings on campus. We had access to a mechanical room in the basement of the building where were able to hook up a fire service water line and domestic water line. This would help us attempt to locate the lines running out of the building. Due to the high utility congestion, rough debris, and bricks, we were unable to get a good reading on the two lines with GPR. Our technicians made another effort to locate the water lines by connecting the transmitter to the fire hydrant where it was suspected that the fire service water line was connected. Using GPR, we were able to locate the majority of the water line.
This project was a great example of the importance of using both EM and GPR to locate utility lines, as different methods work in different situations. By using both methods paired together, there is a greater chance that we will be able to locate any given utility line.