Geophysical Investigation And Characterization With Usrads

This paper describes two recent case histories in which commercially available geophysical<br>instruments were used with an innovative tracking and mapping system called USRADS<br>(UltraSonic Ranging And Data System) that automates data location and collection. USRADS uses<br>ultrasonics to provide real-time surveyor positioning and radio links to transmit the surveyor data<br>to an on-site computer for storage and real-time display. USRADS uses a standard 386 computer<br>for data collection and includes real-time color display of the findings. It also includes numerous<br>analysis and display formats for on-site, as well as utilities to facilitate post-process analysis of the<br>findings.<br>The objective of one project was to locate several suspect waste disposal trenches and to map their<br>boundaries. The second was to locate and map the presence of subsurface unexploded ordinance<br>(UXO) at a suspect artillery impact area. A Geonics EM31 terrain conductivity meter interfaced to<br>USRADS was used to map the suspect trenches. A Schonstedt GA-52C magnetometer interfaced<br>to USRADS was used to map the subsurface UXO. Correlation of findings to known site features<br>and additional knowledge about the sites indicates that these efforts did locate and map the<br>geophysical features including the suspect waste trenches and the subsurface UXO. Images of the<br>findings generated on-site and during post-processing are included.