This SERDP and ESTCP webinar focuses on DoD-funded research efforts on transitioning from active to passive remedies at DoD sites. Specifically, investigators will talk about the development of a quantitative framework for predicting abiotic attenuation under natural and transitional site management scenarios and a web-based application to perform a site-specific transition assessment. First presenter will discuss the development of a web-based application to assist site managers in assessing transition from active remedies to natural attenuation. Second presenter will talk about the development of a quantitative framework for predicting abiotic attenuation under natural and transitional site management scenarios.