The Guide is intended to support decision-making associated with the management of impacts to soil, groundwater and soil vapor, including the presence of Non Aqueous Phase Liquid (NAPL), addressing potential exposures and risks, investigation techniques and readily available technologies from which a site- specific assessment and/or corrective action plan can be developed. Overall the guide describes the: Process used to develop a Conceptual Site Model (CSM) to address potential sources, potential exposure pathways, and potential receptors. Data collection to support the CSM and identify imminent hazards. Process to identify potential risks and assess risk-based corrective action measures. Steps for implementing risk reduction measures and remedial actions. Actions to be taken to close-out the project.