Application of BGPR tomography investigate the Soil and Groundwater Contaminated with Chlorinated Hydrocarbon:Case study

Tuesday, 16 December 2014
Hsing Chang Liu1,2, Chih-Ping Lin2, Tien--Hsing Dong3 and Chieh-Hou Yang1, (1)Chien Hsin University of Science and Technology, Zhongli, Taiwan, (2)National Chiao Tung University, Hsinchu, Taiwan, (3)Apollo Technology Co.,Ltd. R.O.C., Taipei, Taiwan
The success of an environmental contaminated project is often determined by the extent to which it is able to ascertain and control subsurface conditions. At present, site managers have limited tools to gain detailed information on the distribution of possible underground barriers or anomalous bodies. The technology employed in Taiwan to evaluate or confirm subsurface anomalies relies primarily on surface geophysical surveys, borehole drillings, or past records. Surface ground-penetrating radar GPR survey is among the most popular of these methods. Surface GPR technique can be used in many ways, but this method is not always the best suited to Taiwan’s conditions. Surface GPR surveys are adversely affected by the conductivity of silty/clayey sediment and cultural noises. As a result, when surface GPR surveys are used, both detection and resolution of subsurface anomalies will decrease with depth. In order to overcome these obstacles, the use of borehole GPR BGPR with a few boreholes may provide a more direct and effective way to detect an underground target. Recent improvement in the quality of BGPR contributes to the suitability of this type of survey work when implemented on construction sites. This paper ues the BGPR geophysical technology has been developed to overcome above limitations. The information of multi-wells logging could be used to interpret the permeability of subsurface, the dominate flow path and the hot-spot for evaluating the distribution of pollution and the efficiency of remediation in different time sequences.