Evaluating Hydrocarbon Removal from Source Zones and its Effect on Dissolved Plume Longevity and Concentration Provides valuable information and utilit ies for regulators and practitioners interested in understanding the possible benefits of free - product removal. This report provides theory and concepts needed to evaluate light nonaqueous phase liquid (LNAPL) source distributi on, chemistry, dissolution, and the effects various remediation strategies may have on risk reduction for the groundwater and vapor exposure path ways. The companion software, API - LNAST, links the multiphase and chemic al processes controlling in - situ LNAPL distribution, mobility, and cleanup to qu antify estimates of the time - dependent concentrations within the LNAPL source and the down gradient dissolved plume. API - LNAST users can screen whether incremental LNAPL removal provides any risk - reduction benefit over a time frame of interest, e.g. 30 years. September 2002 | Software and docu mentation can be downloaded at https://www.api.org/oil - and - natur al - gas/environment/clean - water/ ground - water/lnapl/evaluat ing - hydrocarbon - removal Publ 4730 Groundwater Remediation Strategies Tool Provides strategies for focusing re mediation efforts on (1) the change in contami t mass flux in different subsurface tran sport compartments (e.g. the vadose zone, smear zone, or a zone within an aquifer of interest) and (2) the change in remediation timeframe. In this approach, groundwater flow and contami t concentration data are combined to estimate the rate of contami t mass transfer past user - selected transects across a contami t plume. Th e method provides the user with a means to estimate the baseline mass flux and remediation timeframe for various transport co mpartments and then evaluate how different remedies reduce the mass flux and the remediation timeframe in each transport compartment