Bioslurping has been demonstrated as a conventional method for the removal of petroleum contaminants from soil contaminated with LNAPL (Light Non-Aqueous Phase Liquid). The major disadvantage in the method was the limited extraction efficiency caused by watertable fluctuation and limitation of slurper. In order to overcome that, we developed a float type slurper and the efficiency of the modified slurper was studied under in vitro conditions. A marked difference in the extraction efficiency was observed in lysimeter which was simulated with LNAPL-contaminated soil. In addition, LNAPL removal rate were also studied under various vacuum conditions. Based on the results, we conclude that the modified slurping can be used as an alternative remediation technology in initial phase of the LNAPL remediation.