EPS secant wall forms help to simplify the process of laying out and drilling secant walls. Secant walls are formed by drilling overlapping cylinders filled with concrete and reinforced with rebar or steel I-beams. Some site conditions that would indicate secant wall consideration are difficult soil conditions, foundations up against property lines and keeping an area watertight in wet soil conditions. Secant walls are also used in dam and subway construction as well as certain marine applications. The EPS guide forms can be of any required diameter an depth.