判定DNAPLs (Dense Nonaqueous Phase Liquids)流入地層後的位置是相當困難，此常為污染場址整治和/或控制上的瓶頸。由於DNAPLs具高電阻值，地電法可能為最好偵檢DNAPLs存在之最佳方法之一。 本研究結合地電阻影像剖面法及透地雷達法兩種地物方法，對於一整治中的場址進行研究，找出地層中DNAPLs可能殘留的位置，總計在可能污染區配置二維地電測線13條，三維地電測線2條及透地雷達測線7條。施測結果發現該場址中有四處疑似有DNAPLs pool的存在，深度約在12至15 m。 與前人研究的結果比對發現地層中的DNAPLs仍有移動的現象；由長時間監測的結果，該場址的整治已有成效。由於透地雷達法探測深度有限，地電阻影像剖面法對於此場址中DNAPLs的探測成效較好。 Locating Dense Non-Aqueous Phase Liquids (DNAPLs) source zones are difficult. This job is often a bottleneck for the successful remediation and/or control of polluted sites. Since DNAPLs have a very high electrical resistivity, the resistivity methods may be one of the best ways to locate a polluted zone. I This study reports the results of using resistivity image profiling method (RIP method) and ground penetrating radar method (GPR method) to detect DNAPLs in a well known polluted site. Thirteen two-dimensional (2-D) and two three-dimensional (3-D) RIP survey lines, and seven GPR survey lines were carried on the suspected polluted zones. The results indicate that four suspected DNAPLs pools at depths ranged from 12 to 15 m. Comparison made between the results obtained from the author with the former study, the residual of DNAPLs is still migrated. Based on a long term of observations, the remediation has worked well. Due to a limitation of investigating depth by using GPR method, RIP results provide more subsurface information than that of GPR method in this study.