The liquid form of Soiltac® proposed for use in Lahaina does not contain microplastics. While the liquid form does meet the federal definition of a plastic [an organic or synthetic polymer liquid that is solid in its final form and is shaped by flow, 40 CFR § 463.2 (f)], once applied the material will form a crust that will prevent ash and dust from migrating into the environment, including microplastics present in the ash as a result of burned plastic materials in the homes. In the event that the Soiltac® is disturbed, either through foot traffic or other physical disturbance, EPA does not anticipate that the crust can break into particles small enough to be considered a microplastics issue. This is also a temporary solution that will be removed from the properties during the Phase 2 ash and debris removal.