Intercept Wall (TRC) Surrounds Closed Landfill in Antioch, CA

A closed landfill in Antioch, California, potentially had contaminates of concern migrating off-site and moving toward a residential neighborhood. SEC designed a methodology that utilized a pilot-study intercept wall, comprised of installing an impermeable barrier as deep as 120’ below grade. The trench necessitated a slurry support method, that allowed the trench to remain open until the appropriate depth was …