This manual surveys important remediation technologies used in the remediation of contaminated aquifers and provides a detailed analysis of each approach. The techniques covered include simple screening model and field application, pump-and-treat, bioremediation, steam flooding, and air sparging. The discussion of both the benefits and limitations of each approach allows engineers to evaluate the applicability of the technology in actual scenarios. Models of multiphase flow systems that are commonly observed in organic-contaminated aquifers are presented, as well as previous modeling work to predict flow and transport in multiphase systems and currently available modeling software for remediation purposes.