A cast concrete block for use in a vertical retaining wall. The upper reveal is formed from TPV and a carrier. Each entry in the separate DLH queue represents a hypercall routine. The deck is positioned at an acute angle relative to the interior surface such that a first portion of the deck is disposed closer to the interior surface than a second portion of the deck. A detector for determining a difference between a positive field detector voltage and a negative field detector voltage is used to provide a feed-back loop for feeding back the difference to a controller to adjust the common mode electrode voltage.