Tetrachloroethylene Groundwater Remediation In A Dolomitic Limestone Aquifer Using Injectable Zero Valent Iron
Thursday, December 6, 2018: 11:40 a.m.
Exhibit Hall- C4 & C5 (Las Vegas Convention Center)
Tetrachloroethylene (PCE) and its daughter products were detected in the shallow portion of a fractured dolomitic aquifer system between five (5) and 30 feet below ground surface (ft bgs) at a former dry cleaning facility located in Indiana. Geophysical surveys were conducted to guide investigation activities and subsequently used to direct monitoring well placement. Zero valent iron (ZVI) along with a carbon substrate was chosen as the remedial technology. A Pilot Test was completed to evaluate the chemical selection/injection technology and the ability of the fractured bedrock to accept the chemical injections. Based on the Pilot Test results, the combination of ZVI and carbon substrate was selected for the full-scale chemical injection. Full-scale injections were subsequently implemented at 21 injection locations. Following full-scale injection, a methane survey was completed to alleviate state agency concerns over production of excessive levels of methane. The remedial strategy has been a success at the Site with substantial contaminant reduction in a challenging fractured bedrock media, a strategy that can be used at other impacted bedrock Sites.