Sonic CPT Probing in Support of DNAPL Characterization

Abstract : The U.S. Department of Defense (DoD) and Department of Energy (DoE) are currently pursuing efforts to identify and remediate thousands of contaminated sites. Current efforts are focused on economizing, and improving the quality of site characterization and remediation processes. Cone Penetrometer Technology (CPT) offers numerous advantages in that it is generally faster, less expensive, safer, and generates far less secondary waste than conventional drilling methods. As a result, DoD and DoE efforts are directed at developing advanced sensors for delivery by the cone penetrometer. To accommodate these new sensors, probe sizes have increased (from 1.44-in OD to 1.75-in OD and currently to 2.25-in OD) and the ability of CPT to reach desired depths has been increased. To enhance the penetration capability of the CPT, a sonic vibratory system was integrated with conventional CPT to advance cone penetrometer sensor packages past currently attainable depths. This CPT enhancement provides an efficient tool for hazardous waste site characterization, remediation, and monitoring.