Electrical signatures of ethanol-liquid mixtures: Implications for monitoring biofuels migration in the subsurface

► Geophysical measurements are sensitive to EtOH-liquid mixtures interactions. ► Geophysical techniques may be used as monitoring tools for EtOH in water. ► A simple mixing model can be used to estimate EtOH concentration at ≤ 0.4 v/v. ► Such tools may ultimately serve to assess EtOH-contaminated sites. ► They can aid in the decision-making process regarding remediation strategies.