42 inch diameter, 16 feet deep, belled to seven feet diameter bottom- protecting it’s precious load from heave, settling, and all the other plagues to foundation work. Cast in place with 4000psi concrete, and more than two thousand pounds of rebar, the eight deep drilled foundations for the bullet tank and two pipe racks will stand firm as long as I’ll walk this planet’s face. This is only one of the many types of specialty foundations that Millennium can install for you!