UXO unearthed during construction
An engineering firm was in the process of refurbishing a relatively small ferryboat terminal in the Northeast, when an intact, massive - and potentially explosive - Rodman cannonball was unearthed by a backhoe.
In their latest case study, Aqua Survey describes how they surveyed the work zone for other unexploded ordnance to ensure worker safety.
Aqua Survey utilized customized military-grade electromagnetic induction (EMI) metal detection electronics (marine and terrestrial platforms) to locate ferrous and non-ferrous objects within the work zone. None of the detected targets were UXO. EMI was used because of its ability to detect both ferrous and non-ferrous objects. UXO objects often have very little ferrous content and are often undetectable with a magnetometer.
Submerged UXO on or protruding from the surface can be detected by side scan sonar. Terrestrial UXO laying on the ground can often be detected by eye. However, when UXO is potentially fully embedded in the soil or sediment, invasive electronics, such as EMI, are required.
Read this case study, and others, on AquaSurvey.com.