DOE has issued a Supplemental Environmental Assessment (SEA), DOE/EA-1440-S-I, and has prepared a Finding of No Significant Impact (FONSI) for three site development projects at the National Renewable Energy Laboratory’s (NREL) South Table Mountain (STM) site at Golden, Colorado. Through the environmental review process, DOE determined that there are potential environmental impacts from these projects that require mitigation to assure that the impacts would not become significant. Therefore, DOE prepared this Mitigation Action Plan (MAP) to establish conditions for issuing the FONSI as required by 10 CFR 1021.322. The potential impacts requiring mitigation relate to traffic impacts which would result from the transfer of approximately 800 employees that are currently housed in leased offsite space to the STM site. This Mitigation Action Plan outlines the implementation of mitigation measures for the identified potential impacts.