• The potential to dewater and expose additional contaminant mass for remediation was examined by continuous ground water withdrawal over 1-½ acres.  Nineteen extraction wells on approximately 80-foot centers were pumped continuously for 7 months.  Water table depression was monitored using multi-level piezometer nests and neutron logging.
• SVE was tested using various options:  SVE from shallow vadose zone via a single well, multiple wells, and a horizontal well; and SVE from the dewatered zone via single and multiple wells.  A network of 40+ multi-depth monitoring points was used to establish radius of influence of each option and efficacy of contaminant removal. 
• Pulsed air sparging into two very fine-grained sand layers was tested to evaluate the ability to deliver and recover injected air.  Different tracer gases (helium, sulfur hexafluoride) were used for two sparged depths.  Electrical resistivity tomography was used to map changes in percent saturation within sediment in the sparged area.  

   

This presentation will describe the rationale for pilot test design, novel measurement techniques, and pilot test results.  Incorporation of lessons learned into forward planning to meet the 80-acre redevelopment objectives and schedule will be discussed.