An apparatus and process for delivering aerosol-based amendments into a subsurface region is provided. The apparatus used to form the aerosol has an ability to restrict the aerosol particle size to a preferred particle size range such that undesired particle sizes are not introduced. By maintaining a proper ratio of aerosol particle size to subsurface pore size, the efficiency of an aerosol introduction can be enhanced.
STATEMENT AS TO RIGHTS TO INVENTIONS MADE UNDER FEDERALLY SPONSORED RESEARCH AND DEVELOPMENT
 This invention was made with Government support under Contract No. DE-AC09-08SR22470 awarded by the United States Department of Energy. The Government has certain rights in the invention.