Aspen prepared the baseline conditions portion of an EIS/EIR to support a Corps feasibility study for the removal of Matilija Dam on Matilija Creek, a tributary of the Ventura River. Aspen prepared the air quality section and general conformity analysis for the Matilija Dam Ecosystem Restoration Project EIS/R for the Corps. The air quality analysis included estimating emissions from over one dozen separate construction tasks being conducted at separate locations and under different overlapping schedules. Aspen worked with the Corps to determine an appropriate construction task schedule and appropriate air quality mitigation measures, including, the electrification of all large stationary engines required for the project.